Final California 2012 Integrated Report( 303(d) List/305(b) Report)

Supporting Information

Regional Board 1 - North Coast Region

Water Body Name:	Mendocino Coast HU, Gualala River HA, Gualala River
Water Body ID:	CAR1138502119980709123111
Water Body Type:	River & Stream

DECISION ID	26711	Region 1
Mendocino Coast HU, Gualala River HA, Gualala River

Pollutant:	Aluminum
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2010)
Revision Status	Revised
Sources:	Source Unknown
Expected TMDL Completion Date:	2025
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This listing applies to the mainstem Gualala River in the Gualala River HA. The mainstem Gualala River is being considered for removal from the section 303(d) list for aluminum impairment under section 4.1 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing the mainstem Gualala River from the section 303(d) list for aluminum impairment (i.e., sufficient justification to not delist). This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. (3) Three of 22 samples from the mainstem Gualala River exceeded the objective and this exceeds the allowable frequency listed in Table 4.1 of the Listing Policy. (4) Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the mainstem Gualala River should not be removed from the section 303(d) list for aluminum impairment because applicable water quality standards for the pollutant are being exceeded.
State Board Staff Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 26711, Aluminum Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	25382
Pollutant:	Aluminum
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	18
Number of Exceedances:	2
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Two of the 18 aluminum samples collected from the Gualala River exceed the objective. Sample concentrations range from 11.20 to 4,015.00 ug/L. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008).
Data Reference:	Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Per the Basin Plan (NCRWQCB 2007): The Maximum Contaminant Level for aluminum is 1.0 mg/l (1,000 ug/L).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Samples were collected from the Gualala River at Gualala Regional Park (SWAMP Station ID 113GUAGRP). Samples were collected from well-mixed flows in glides or riffles.
Temporal Representation:	Samples were collected as grab samples during 20 sites visits from May 2001 to June 2006. Visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions:	There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information:	Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (Puckett 2002).
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 26711, Aluminum Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41382
Pollutant:	Aluminum
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 1 of 4 samples exceed the criterion for Aluminum.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L.
Objective/Criterion Reference:	Secondary Maximum Contaminant Levels and Compliance. CCR title 22 section 64449.
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan

DECISION ID	20269	Region 1
Mendocino Coast HU, Gualala River HA, Gualala River

Pollutant:	Temperature, water
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2010)
Revision Status	Revised
Sources:	Flow Alteration/Regulation/Modification | Removal of Riparian Vegetation
Expected TMDL Completion Date:	2019
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for removal from the section 303(d) list under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. Three lines of evidence are available in the administrative record to assess this pollutant. There are only four grab samples from the mainstem Gualala River (LOE 43253) and this sample size is not sufficient to determine with the power and confidence of the Listing Policy if the cold freshwater habitat (COLD) beneficial use is being protected, as a minimum of 26 samples is needed for application of Table 4.2. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the section 303(d) list. This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. (3) 303(d) listing determinations made prior to 2006 were not held in an assessment database. LOE 4753 is a placeholder for the 303(d) listing data and information from a previous assessment cycle that was initially utilized to make this listing determination. (4) Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.
State Board Staff Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 20269, Temperature, water Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	4753
Pollutant:	Temperature, water
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:
Number of Exceedances:
Data and Information Type:	Not Specified
Data Used to Assess Water Quality:	This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference:	Placeholder reference pre-2006 303(d)
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:
Objective/Criterion Reference:
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information:	Unspecified
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 20269, Temperature, water Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	31527
Pollutant:	Temperature, water
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Not Specified
Data Used to Assess Water Quality:	The following process is utilized to interpret the narrative Temperature Objective in the Basin Plan for impairment assessments. Step 1: determine if temperatures reflect natural conditions. If Yes, then the water body is not considered impaired, if No, Then go to Step 2. Step 2: Determine if temperatures adversely affect beneficial uses. If Yes, then the water body is considered impaired, if No, then go to Step 3. Step 3: Determine if temperatures are increased by 5 degrees F. If Yes, then water body is impaired, if No, then water body is not impaired.
Data Reference:	Presentation: Interpreting Temperature Standards in the North Coast Region. North Coast Regional Water Quality Control Board.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	EVIDENCE OF ALTERATION OF NATURAL RECEIVING WATER TEMPERATURES (NON-NATURAL TEMPS): The water temperatures of the Gualala River watershed do not reflect natural conditions as environmental factors that influence water temperature have been altered, such as flow alteration and riparian shade removal (NCWAP 2003). EVIDENCE OF SALMONID PRESENCE & LIFE CYCLE USE: Coho and steelhead are present in the watershed (NCWAP 2003). Steelhead rearing occurrs during all months of the year (Moyle et. al. 2008) and spawning occurrs January through March for steelhead (Busby et al. 1996) and November through May for coho (CDFG 2004). The Gualala River watershed supports core rearing.
Guideline Reference:	Water quality data-Gualala River. North Coast Watershed Assessment Program
	Status Review of West Coast Steelhead from Washington, Idaho, Oregon, and California
	Salmon, Steelhead, and Trout in California: Status of an Emblematic Fauna
	Recovery Strategy for California Coho Salmon: Report to the California Fish and Game Commission
Spatial Representation:	Information pertains to the Mendocino Coast HU, Gualala River HA, Gualala River
Temporal Representation:	Information is representative of current conditions in this waterbody.
Environmental Conditions:
QAPP Information:	Information is considered to be of adequate quality for the Integrated Report.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 20269, Temperature, water Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	43253
Pollutant:	Temperature, water
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Water Temperature.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	Per "Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids" (Carter 2008): The lethal temperature evaluation guideline for both steelhead adult migration & holding and juvenile growth & rearing of 24°C applies in this water body June-October. The lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C and applies November-May. See LOE ID 31527 for more information on natural temperature alterations and salmonid presence and periodicity in this water body.
Guideline Reference:	Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan

DECISION ID	29438	Region 1
Mendocino Coast HU, Gualala River HA, Gualala River

Pollutant:	Aldrin | Atrazine | Azinphos, Ethyl (Ethyl Guthion) | Azinphos-methyl (Guthion) | Bolstar | Carbofuran | Chlordane | Chlorothalonil | Chlorpyrifos | Chlorpyrifos, methyl | Ciodrin | Dacthal | Demeton s | Diazinon | Dichlofenthion | Dichlorvos | Dieldrin | Dimethoate | Dioxathion | Dyfonate (Fonofos or Fonophos) | Endosulfan | Endosulfan sulfate | Endrin | Endrin Ketone | Endrin aldehyde | Ethion | Ethoprop | Famphur | Fenchlorphos | Fenitrothion | Fensulfothion | Fenthion | Glyphosate | Heptachlor | Heptachlor epoxide | Hexachlorobenzene/ HCB | Hexachlorocyclohexane (HCH), alpha | Hexachlorocyclohexane (HCH), beta | Leptophos | Lindane/gamma Hexachlorocyclohexane (gamma-HCH) | Malathion | Merphos | Methidathion | Methoxychlor | Methyl Parathion | Mevinphos | Mirex | Molinate | Naled | Oxadiazon | Oxychlordane | Parathion | Phorate | Phosmet | Phosphamidon | Prometon (Prometone) | Prometryn | Propazine | Secbumeton | Simazine | Simetryn | Sulfotep | Tedion | Terbufos | Terbuthylazine | Terbutryn | Tetrachlorvinphos | Thiobencarb/Bolero | Thionazin | Tokuthion | Toxaphene | Trichlorfon | Trichloronate | alpha-Endosulfan (Endosulfan 1) | beta-BHC (Benzenehexachloride or beta-HCH) | beta-Endosulfan (Endosulfan 2) | cis-Nonachlor | delta-BHC (Benzenehexachloride or delta-HCH) | o,p'-DDD (Dichlorodiphenyldichloroethane)) | o,p'-DDE (Dichlorodiphenyldichloroethylene) | p,p'-DDD (Dichlorodiphenyldichloroethane) | p,p'-DDE | p,p'-DDMU | trans-Nonachlor
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	These pollutants are being considered for placement on the Section 303(d) List under Section 3.1 of the Listing Policy. Under Section 3.1, a single line of evidence is necessary to assess listing status. Thirty-four lines of evidence are available to assess protection of the cold freshwater habitat (COLD) beneficial use, thirty lines of evidence are available to assess protection of the warm freshwater habitat (WARM) beneficial use, thirteen lines of evidence are available to assess protection of the commercial and sport fishing (COMM) beneficial use, and twenty-one lines of evidence are available to assess protection of the municipal and domestic supply (MUN) beneficial use. It should be noted that data from LOE 29875 do not have evaluation guidelines available to interpret the water quality objectives and, therefore, there is insufficient information to determine if the objective is being exceeded for the pollutants in this LOE. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category (i.e., sufficient justification to not list). This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of Section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of Section 6.1.5 of the Policy. (3) Zero of 388 pesticide water samples exceed the MUN water quality objective, zero of 87 pesticide water samples exceed the COLD criteria, zero of 81 pesticide water samples exceed the WARM criteria, and zero of 24 pesticide water samples exceed the COMM criteria. These sample sizes do not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Staff Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	43423
Pollutant:	Simazine
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Simazine.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for simazine is 90 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42872
Pollutant:	Phorate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Phorate.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life LC50 for phorate is 2 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	43365
Pollutant:	Propazine
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Propazine.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for propazine is 1 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	43317
Pollutant:	Propazine
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Propazine.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for propazine is 1 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	43220
Pollutant:	Thiobencarb/Bolero
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Thiobencarb.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for thiobencarb is 1.4 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	43197
Pollutant:	Thiobencarb/Bolero
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Thiobencarb.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for thiobencarb is 0.001 mg/L
Objective/Criterion Reference:	Secondary Maximum Contaminant Levels and Compliance. CCR title 22 section 64449.
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	43187
Pollutant:	Thiobencarb/Bolero
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Thiobencarb.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for thiobencarb is 1.4 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	43159
Pollutant:	Simazine
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Simazine.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for simazine is 90 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	43102
Pollutant:	Parathion
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA national ambient water quality criterion for freshwater aquatic life 4-hour maximum for parathion is 0.013 µg/L.
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	43040
Pollutant:	Parathion
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA national ambient water quality criterion for freshwater aquatic life 4-hour maximum for parathion is 0.013 µg/L.
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42964
Pollutant:	Phosmet
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Phosmet.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for phosmet is 5.6 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42956
Pollutant:	Prometryn
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Prometryn.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for prometryn is 1 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42954
Pollutant:	Prometon (Prometone)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Prometon.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for prometon is 98 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42926
Pollutant:	Phosmet
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Phosmet.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for phosmet is 5.6 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42916
Pollutant:	Prometon (Prometone)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Prometon.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for prometon is 98 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42906
Pollutant:	Prometryn
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Prometryn.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for prometryn is 1 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	43378
Pollutant:	Simazine
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Simazine.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for simazine is 0.004 mg/L.
Objective/Criterion Reference:	Maximum Contaminant Levels for organic and inorganic chemicals. CCR
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42858
Pollutant:	Phorate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Phorate.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life LC50 for phorate is 2 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42840
Pollutant:	Methyl Parathion
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Parathion, Methyl.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The California Department of Fish and Game instantaneous criteria for Methyl Parathion is 0.08 ug/L.
Guideline Reference:	Hazard Assessment of the Insecticide Methyl to Aquatic Organisms in the Sacramento River System
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42826
Pollutant:	Methyl Parathion
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Parathion, Methyl.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The California Department of Fish and Game instantaneous criteria for Methyl Parathion is 0.08 ug/L.
Guideline Reference:	Hazard Assessment of the Insecticide Methyl to Aquatic Organisms in the Sacramento River System
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42765
Pollutant:	Methidathion
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Methidathion.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for methidathion is 0.86 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42750
Pollutant:	Malathion
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The University of California, Davis chronic criterion for the protection of freshwater aquatic life for malathion is 0.028 ug/L.
Guideline Reference:	Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42686
Pollutant:	Malathion
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The University of California, Davis, chronic criterion for the protection of freshwater aquatic life for malathion is 0.028 ug/L.
Guideline Reference:	Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42618
Pollutant:	Mirex
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The criterion continuous concentration from the USEPA national ambient water quality criterion for the protection of freshwater aquatic life for mirex is 0.001 µg/L.
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42612
Pollutant:	Molinate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Molinate.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for molinate is 0.6 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42590
Pollutant:	Molinate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Molinate.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for molinate is 0.6 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42575
Pollutant:	Molinate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Molinate.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for molinate is 0.02 mg/L.
Objective/Criterion Reference:	Maximum Contaminant Levels for organic and inorganic chemicals. CCR
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42531
Pollutant:	Mirex
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The criterion continuous concentration from the USEPA national ambient water quality criterion for the protection of freshwater aquatic life for mirex is 0.001 µg/L.
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42522
Pollutant:	Methoxychlor
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Methoxychlor.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA national ambient water quality criterion for freshwater aquatic life instantaneous maximum for methoxychlor is 0.03 µg/L.
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42507
Pollutant:	Methoxychlor
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Methoxychlor.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for methoxychlor is 0.03 mg/L.
Objective/Criterion Reference:	Maximum Contaminant Levels for organic and inorganic chemicals. CCR
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42488
Pollutant:	Methoxychlor
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Methoxychlor.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA national ambient water quality criterion for freshwater aquatic life instantaneous maximum for methoxychlor is 0.03 µg/L.
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42471
Pollutant:	Methidathion
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Methidathion.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for methidathion is 0.86 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42440
Pollutant:	Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for HCH, gamma.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for HCH, gamma (Lindane or gamma-BHC) to protect aquatic life in freshwater criterion maximum concentration is 0.95 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42434
Pollutant:	Heptachlor
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Heptachlor.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor to protect aquatic life in freshwater criterion continuous concentration (expressed as a 4-day average) is 0.0038 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42427
Pollutant:	Heptachlor
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Heptachlor.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor to protect aquatic life in freshwater criterion continuous concentration (expressed as a 4-day average) is 0.0038 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42401
Pollutant:	Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for HCH, gamma.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for gamma-BHC (Lindane, gamma-HCH) to protect human health from the consumption of water and organisms is 0.019 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42376
Pollutant:	Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for HCH, gamma.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for gamma-BHC (Lindane, gamma-HCH) to protect human health from consumption of organisms only is 0.063 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42351
Pollutant:	Heptachlor
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor to protect of human health from the consumption of water and organisms is 0.00021 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42326
Pollutant:	Heptachlor
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor to protect human health from consumption of organisms only is 0.00021 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42297
Pollutant:	Hexachlorocyclohexane (HCH), beta
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for HCH, beta.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-BHC (HCH, beta) to protect human health from the consumption of water and organisms is 0.014 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42288
Pollutant:	Hexachlorobenzene/ HCB
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for hexachlorobenzene to protect of human health from the consumption of water and organisms is 0.00075 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42228
Pollutant:	Hexachlorobenzene/ HCB
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for hexachlorobenzene to protect human health from consumption of organisms only is 0.00077 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42221
Pollutant:	Heptachlor epoxide
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor epoxide to protect of human health from the consumption of water and organisms is 0.00010 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42209
Pollutant:	Heptachlor epoxide
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Heptachlor epoxide.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor epoxide to protect aquatic life in freshwater criterion continuous concentration (expressed as a 4-day average) is 0.0038 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42187
Pollutant:	Heptachlor epoxide
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Heptachlor epoxide.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor epoxide to protect aquatic life in freshwater criterion continuous concentration (expressed as a 4-day average) is 0.0038 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42161
Pollutant:	Heptachlor epoxide
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor epoxide to protect human health from consumption of organisms only is 0.00011 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42145
Pollutant:	Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for HCH, gamma.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for HCH, gamma (Lindane or gamma-BHC) to protect aquatic life in freshwater criterion maximum concentration is 0.95 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42121
Pollutant:	Endrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endrin.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.036 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42115
Pollutant:	Endosulfan sulfate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endosulfan sulfate.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endosulfan sulfate to protect of human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42108
Pollutant:	Endrin aldehyde
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endrin Aldehyde.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin aldehyde to protect of human health from the consumption of water and organisms is 0.76 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42067
Pollutant:	Endrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endrin.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect of human health from the consumption of water and organisms is 0.76 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42042
Pollutant:	Endrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endrin.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect human health from consumption of organisms only is 0.81ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42036
Pollutant:	Endosulfan sulfate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endosulfan sulfate.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA national ambient water quality criterion for freshwater aquatic life 24 hour average maximum for endodulfan sulfate is 0.056 µg/L.
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42029
Pollutant:	Endrin aldehyde
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endrin Aldehyde.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin aldehyde to protect human health from consumption of organisms only is 0.81ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41982
Pollutant:	Endosulfan sulfate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endosulfan sulfate.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA national ambient water quality criterion for freshwater aquatic life 24 hour average maximum for endodulfan sulfate is 0.056 µg/L.
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41957
Pollutant:	Hexachlorocyclohexane (HCH), alpha
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for HCH, alpha.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-BHC (HCH, alpha) to protect human health from consumption of organisms only is 0.013 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41931
Pollutant:	Hexachlorocyclohexane (HCH), alpha
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for HCH, alpha.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-BHC (HCH, alpha) to protect human health from the consumption of water and organisms is 0.0039 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41920
Pollutant:	Hexachlorocyclohexane (HCH), beta
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for HCH, beta.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-BHC (HCH, beta) to protect human health from consumption of organisms only is 0.046 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41895
Pollutant:	Glyphosate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Glyphosate.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life LC50 for glyphosate is 55000 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41878
Pollutant:	Glyphosate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Glyphosate.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for glyphosate is 700 ug/L.
Objective/Criterion Reference:	Maximum Contaminant Levels for organic and inorganic chemicals. CCR
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41859
Pollutant:	Glyphosate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Glyphosate.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life LC50 for glyphosate is 55000 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41850
Pollutant:	Dyfonate (Fonofos or Fonophos)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Fonofos (Dyfonate).
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for fonofos is 0.45 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41834
Pollutant:	Dyfonate (Fonofos or Fonophos)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Fonofos (Dyfonate).
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for fonofos is 0.45 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41821
Pollutant:	Endrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endrin.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.036 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41783
Pollutant:	Dieldrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for dieldrin to protect human health from the consumption of water and organisms is 0.00014 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41773
Pollutant:	alpha-Endosulfan (Endosulfan 1)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endosulfan I.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-endosulfan to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41763
Pollutant:	Dimethoate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Dimethoate.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life LC50 for glyphosate is 43 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41757
Pollutant:	Dieldrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for dieldrin to protection of human health from consumption of organisms only is 0.00014 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41732
Pollutant:	Dichlorvos
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Dichlorvos.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for dichlorvos is 7.2 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41705
Pollutant:	alpha-Endosulfan (Endosulfan 1)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endosulfan I.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-endosulfan to protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41702
Pollutant:	Dieldrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Dieldrin.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for dieldrin to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41678
Pollutant:	Dieldrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Dieldrin.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for dieldrin to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41668
Pollutant:	Dichlorvos
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Dichlorvos.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for dichlorvos is 7.2 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41646
Pollutant:	Endosulfan sulfate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endosulfan sulfate.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endosulfan sulfate to protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41639
Pollutant:	beta-Endosulfan (Endosulfan 2)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endosulfan II.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-endosulfan to protect of human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41633
Pollutant:	beta-Endosulfan (Endosulfan 2)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endosulfan II.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-endosulfan to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41601
Pollutant:	beta-Endosulfan (Endosulfan 2)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endosulfan II.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-endosulfan to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41574
Pollutant:	beta-Endosulfan (Endosulfan 2)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endosulfan II.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-endosulfan to protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41549
Pollutant:	alpha-Endosulfan (Endosulfan 1)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endosulfan I.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-endosulfan to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41532
Pollutant:	alpha-Endosulfan (Endosulfan 1)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endosulfan I.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-endosulfan to protect of human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41502
Pollutant:	Dimethoate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Dimethoate.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life LC50 for dimethoate is 43 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41483
Pollutant:	Chlorpyrifos
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The freshwater criterion continuous concentration to protect aquatic organisms is 0.015 ug/L (Siepmann and Finlayson 2000, with minor corrections to significant figures as described in Beaulaurier et al., 2005).
Guideline Reference:	Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game (with minor corrections to significant figures as described in Beaulaurier et al., 2005).
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41452
Pollutant:	Atrazine
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Atrazine.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for atrazine is 43 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41386
Pollutant:	Atrazine
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Atrazine.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for atrazine is 1 ug/L.
Objective/Criterion Reference:	Maximum Contaminant Levels for organic and inorganic chemicals. CCR
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41318
Pollutant:	Atrazine
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Atrazine.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for atrazine is 43 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41290
Pollutant:	Dacthal
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Dacthal.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life LC50 for dacthal 6600 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41286
Pollutant:	Diazinon
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Diazinon.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The freshwater chronic value for diazinon is 0.1 ug/L, expressed as a continuous concentration (Finlayson, 2004).
Guideline Reference:	Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41280
Pollutant:	Diazinon
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Diazinon.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	As stated in CDFG documents from Siepmann and Finlayson, the 4-day freshwater continuous criterion concentration for diazinon is 0.10 µg/L.
Guideline Reference:	Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41242
Pollutant:	Dacthal
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Dacthal.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life LC50 for dacthal 6600 ug/L.
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41142
Pollutant:	Azinphos-methyl (Guthion)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The National Recommended Water Quality Criteria for Azinphos Methyl (Guthion) for the protection of freshwater aquatic life is a maximum of 0.01 ug/l.
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	40981
Pollutant:	Aldrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Aldrin.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric aldrin criterion maximum concentration to protect aquatic life in freshwater is 3 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	40938
Pollutant:	Aldrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin criteria for the protection of human health from consumption of organisms only is 0.00014 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	40918
Pollutant:	Aldrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin to protect of human health from the consumption of water and organisms is 0.00013 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	40917
Pollutant:	Aldrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Aldrin.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin to protect aquatic life in freshwater as criterion maximum concentration is 3 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	34202
Pollutant:	Endosulfan
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 3 samples exceeded the criteria.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan for the North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. The endosulfan criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.056 ug/L. This value corresponds to the sum of alpha-endosulfan and beta-endosulfan (USEPA National Recommended Water Quality Criteria, 2006).
Objective/Criterion Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Samples collected at station 113GUAGRP (Gualala River at Gualala Regional Park).
Temporal Representation:	Samples collected between 11/26/2007, 4/7/2008, and 7/14/2008.
Environmental Conditions:
QAPP Information:	SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	33369
Pollutant:	Chlordane
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 3 samples exceeded the criterion continuous concentration for chlordane (total). Total chlordane is assessed as the sum of cis-chlordane, trans-chlordane, cis-nonachlor, trans-nonachlor, and oxychlordane.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Basin Plan for the Regional Water Quality Control Board, North Coast Region states that all waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (NCRWQCB 2011). The chlordane criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.0043 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Samples collected at station 113GUAGRP; Gualala River at Gualala Regional Park
Temporal Representation:	Samples collected between 11/26/2007 and 7/14/2008.
Environmental Conditions:
QAPP Information:	SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	33197
Pollutant:	Chlordane
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	The method detection limit for all 3 of the non-detect samples was greater than the criteria and thus the data were not used in this assessment. Total chlordane is assessed as the sum of cis-chlordane, trans-chlordane, cis-nonachlor, trans-nonachlor, and oxychlordane.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Basin Plan for the Regional Water Quality Control Board, North Coast Region states that all waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (NCRWQCB 2011). The total chlordane criterion for the protection of human health from the consumption of water and organisms is 0.00057 ug/L.
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Samples collected at station 113GUAGRP; Gualala River at Gualala Regional Park
Temporal Representation:	Samples collected between 11/26/2007 and 7/14/2008.
Environmental Conditions:
QAPP Information:	SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	30143
Pollutant:	Aldrin | Atrazine | Carbofuran | Chlordane | Chlorpyrifos | Dacthal | Dieldrin | Endrin | Glyphosate | Heptachlor | Heptachlor epoxide | Hexachlorobenzene/ HCB | Hexachlorocyclohexane (HCH), alpha | Hexachlorocyclohexane (HCH), beta | Lindane/gamma Hexachlorocyclohexane (gamma-HCH) | Methoxychlor | Molinate | Simazine | Thiobencarb/Bolero | Toxaphene
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	346
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 346 pesticide samples collected in the Gualala River exceed the objective as all of the samples were measured as non-detect. The samples were analyzed for 95 pesticides, pesticide constituents, isomers, or metabolites. For each of the 95 pesticide analytes, 2 to 4 samples were collected. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the 5-Year Monitoring Report (NCRWQCB 2008).
Data Reference:	Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Per the Basin Plan (NCRWQCB 2007): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guidelines for the dissolved fractions of the pesticides assessed for this waterbody for the Municipal & Domestic Supply beneficial use could be found that meet the requirements of Section 6.1.3 of the Listing Policy.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
Evaluation Guideline:	Hexachlorocyclohexane, alpha (0.0026 ug/l) Hexachlorocyclohexane, beta (0.0091ug/l) Aldrin (0.000049 ug/l) Atrazine (0.001 ug/l) Carbofuran (0.04 mg/l) Chlordane (0.0001 ug/l) Chlorpyrifos (0.083 ug/l) Dacthal (70 ug/l) Dieldrin (0.00014 ug/l) Endrin (0.002 ug/l) Glyphosate (700 ug/l) Heptachlor (0.01 ug/l) Heptachlor epoxide (0.01 ug/l) Hexachlorobenzene/ HCB (0.001 ug/l) Lindane/gamma Hexachlorocyclohexane (gamma-HCH) (.98 ug/l) Methoxychlor (0.03 mg/l) Molinate (0.02 mg/l) Simazine (0.04 mg/l) Thiobencarb/Bolero (0.07 mg/l) Toxaphene (0.003 mg/l)
Guideline Reference:	National recommended water quality criteria: 2002. EPA-822-R-02-047 Washington, D.C. USEPA
	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
	California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring
Spatial Representation:	Samples were collected from the mainstem Redwood Creek at Orick (SWAMP Station ID 107RDWDOR). Samples were collected from well-mixed flows in glides or riffles.
Temporal Representation:	Samples were collected from March 2001 to June 2006. The site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions:	There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information:	Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 29438, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	29875
Pollutant:	Azinphos, Ethyl (Ethyl Guthion) | Bolstar | Carbofuran | Chlorothalonil | Chlorpyrifos, methyl | Ciodrin | Demeton s | Dichlofenthion | Dichlorvos | Dimethoate | Dioxathion | Dyfonate (Fonofos or Fonophos) | Endrin Ketone | Ethion | Ethoprop | Famphur | Fenchlorphos | Fenitrothion | Fensulfothion | Fenthion | Leptophos | Lindane/gamma Hexachlorocyclohexane (gamma-HCH) | Merphos | Methidathion | Methyl Parathion | Mevinphos | Naled | Oxadiazon | Oxychlordane | Phorate | Phosmet | Phosphamidon | Prometon (Prometone) | Prometryn | Propazine | Secbumeton | Simetryn | Sulfotep | Tedion | Terbufos | Terbuthylazine | Terbutryn | Tetrachlorvinphos | Thiobencarb/Bolero | Thionazin | Tokuthion | Trichlorfon | Trichloronate | beta-BHC (Benzenehexachloride or beta-HCH) | cis-Nonachlor | delta-BHC (Benzenehexachloride or delta-HCH) | o,p'-DDD (Dichlorodiphenyldichloroethane)) | o,p'-DDE (Dichlorodiphenyldichloroethylene) | p,p'-DDD (Dichlorodiphenyldichloroethane) | p,p'-DDE | p,p'-DDMU | trans-Nonachlor
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	346
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 346 pesticide samples collected in the Gualala River exceed the objective as all of the samples were measured as non-detect. The samples were analyzed for 95 pesticides, pesticide constituents, isomers, or metabolites. For each of the 95 pesticide analytes, 2 to 4 samples were collected. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the 5-Year Monitoring Report (NCRWQCB 2008).
Data Reference:	Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Per the Basin Plan (NCRWQCB 2007): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guidelines for the dissolved fractions of the pesticides assessed for this waterbody for the Municipal & Domestic Supply beneficial use could be found that meet the requirements of Section 6.1.3 of the Listing Policy.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Samples were collected from the Gualala River at Gualala Regional Park (SWAMP Station ID 113GUAGRP). Samples were collected from well-mixed flows in glides or riffles.
Temporal Representation:	Samples were collected as grab samples during 20 sites visits from May 2001 to June 2006. Visits corresponded to fall, winter, spring and early summer seasonal conditions
Environmental Conditions:	There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information:	Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).
QAPP Information Reference(s):

DECISION ID	22607	Region 1
Mendocino Coast HU, Gualala River HA, Gualala River

Pollutant:	Arsenic | Cadmium | Chromium | Chromium (total) | Copper | Lead | Mercury | Nickel | Selenium | Silver | Zinc
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	These pollutants are being considered for placement on the Section 303(d) List under Section 3.1 of the Listing Policy. Under Section 3.1, a single line of evidence is necessary to assess listing status. Eleven lines of evidence are available to assess protection of the municipal and domestic supply (MUN) beneficial use, seven lines of evidence are available to assess protection of the cold freshwater habitat (COLD) beneficial use, and two lines of evidence are available to assess protection of the commercial and sport fishing (COMM) beneficial use. Zero of 225 metals samples exceed the MUN water quality objective and zero of 28 metals samples exceed the COLD water quality objective. Additionally, zero of eight metals samples exceed the COMM water quality objective however this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are not met, as a minimum of either (a) 16 samples, or (b) greater than or equal to 2 exceedances of the COMM objective with less than 16 samples is needed for application of Table 3.1. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category (i.e., sufficient justification to not list). This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of Section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of Section 6.1.5 of the Policy. (3) Zero of 225 metals samples exceed the MUN water quality objective and zero of 28 metals samples exceed the COLD water quality objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Staff Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 22607, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	43392
Pollutant:	Selenium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Selenium.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.
Objective/Criterion Reference:	Maximum Contaminant Levels for organic and inorganic chemicals. CCR
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 22607, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	43249
Pollutant:	Zinc
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Zinc.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Zinc is 5 mg/L.
Objective/Criterion Reference:	Secondary Maximum Contaminant Levels and Compliance. CCR title 22 section 64449.
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 22607, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	43047
Pollutant:	Nickel
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Nickel.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4.6 mg/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 22607, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	43007
Pollutant:	Nickel
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Nickel.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.
Objective/Criterion Reference:	Maximum Contaminant Levels for organic and inorganic chemicals. CCR
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 22607, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42753
Pollutant:	Mercury
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Mercury.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 22607, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42656
Pollutant:	Mercury
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Mercury.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to Total mercury is 0.77 ug/L.
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 22607, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42644
Pollutant:	Lead
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Lead.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for MUN shall not contain concentrations of chemical constituents in excess of values listed in Table 3-2 of the Basin Plan. The value for lead is 0.05 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 22607, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42464
Pollutant:	Mercury
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Mercury.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 22607, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41449
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Arsenic.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.
Objective/Criterion Reference:	Maximum Contaminant Levels for organic and inorganic chemicals. CCR
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 22607, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41332
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Cadmium.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Maximum Contaminant Levels for organic and inorganic chemicals. CCR
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 22607, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41235
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Copper.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference:	Secondary Maximum Contaminant Levels and Compliance. CCR title 22 section 64449.
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 22607, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	41188
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Chromium.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.
Objective/Criterion Reference:	Maximum Contaminant Levels for organic and inorganic chemicals. CCR
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 22607, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	33381
Pollutant:	Silver
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 4 samples exceeded the hardness based criteria calculated for silver.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion maximum concentrations (1-hour average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Samples collected at station 113GUAGRP (Gualala River at Gualala Regional Park).
Temporal Representation:	Samples collected between 11/26/2007 and 7/14/2008.
Environmental Conditions:
QAPP Information:	SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 22607, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	33380
Pollutant:	Nickel
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 4 samples exceeded the hardness based criteria calculated for nickel.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Samples collected at station 113GUAGRP (Gualala River at Gualala Regional Park).
Temporal Representation:	Samples collected between 11/26/2007 and 7/14/2008.
Environmental Conditions:
QAPP Information:	SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 22607, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	33379
Pollutant:	Lead
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 4 samples exceeded the hardness based criteria calculated for lead.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Samples collected at station 113GUAGRP (Gualala River at Gualala Regional Park).
Temporal Representation:	Samples collected between 11/26/2007 and 7/14/2008.
Environmental Conditions:
QAPP Information:	SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 22607, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	33378
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 4 samples exceeded the hardness based criteria calculated for copper.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Samples collected at station 113GUAGRP (Gualala River at Gualala Regional Park).
Temporal Representation:	Samples collected between 11/26/2007 and 7/14/2008.
Environmental Conditions:
QAPP Information:	SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 22607, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	33377
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 4 samples exceeded the hardness based criteria calculated for cadmium.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Samples collected at station 113GUAGRP (Gualala River at Gualala Regional Park).
Temporal Representation:	Samples collected between 11/26/2007 and 7/14/2008.
Environmental Conditions:
QAPP Information:	SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 22607, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	21541
Pollutant:	Arsenic | Cadmium | Chromium (total) | Copper | Lead | Mercury | Nickel | Selenium | Silver | Zinc
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	185
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 185 metal samples collected in the Gualala River exceed the objectives. All of the 10 parameters were sampled at the Gualala Regional Park site. There were only 2 lead samples collected in the other 4 sites. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008).
Data Reference:	Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Per the Basin Plan (NCRWQCB 2007): Arsenic objective is 0.05 mg/L. Cadmium objective is 0.01 mg/L. Chromium objective is 0.05 mg/L. Lead objective is 0.05 mg/L. Mercury objective is 0.002 mg/L. Selenium objective is 0.01 mg/L. Silver objective is 0.05 mg/L. Per 22 CCR 64431: Nickel maximum contaminant level is 0.1 mg/L. Per 22 CCR 64449: Copper secondary maximum contaminant level is 1.0 mg/L. Zinc secondary maximum contaminant level is 5.0 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
	Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Samples were collected from the Gualala River at 5 locations as follows: (1) from the Gualala River at House Creek (SWAMP Station ID 113GUAHSE), (2) from the Wheatfield Fork Gualala River (SWAMP Station ID 113GUAWHT), (3) from the South Fork Gualala River at Hauser Bridge (SWAMP Station ID 113SGUAHB), (4) from the South Fork Gualala River at Annapolis Road (SWAMP Station ID 113GUASFK), and (5) from the mainstem Gualala River at Gualala Regional Park (SWAMP Station ID 113GUAGRP). Samples were collected from well-mixed flows in glides or riffles.
Temporal Representation:	At all the sites but the Gualala Regional Park site, samples were collected as grab samples during 2 site visits from each site from May to June 2001. At the Gualala Regional Park site, samples were collected as grab samples during 20 sites visits from May 2001 to June 2006. At the Gualala Regional Park site, visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions:	There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information:	Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 22607, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	43453
Pollutant:	Selenium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Selenium.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 22607, Multiple Pollutants Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	43418
Pollutant:	Silver
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Silver.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for silver is 0.1 mg/L.
Objective/Criterion Reference:	Secondary Maximum Contaminant Levels and Compliance. CCR title 22 section 64449.
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan

DECISION ID	31719	Region 1
Mendocino Coast HU, Gualala River HA, Gualala River

Pollutant:	Boron
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the Section 303(d) List under Section 3.1 of the Listing Policy. Under Section 3.1, a single line of evidence is necessary to assess listing status. One line of evidence is available to assess protection of the agricultural supply (AGR) beneficial use. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category (i.e., sufficient justification to not list). This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. (3) Zero of four samples exceed the evaluation guideline used to interpret the narrative objective, and this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are not met, as a minimum of either (A) 16 samples, or (B) greater than or equal 2 exceedances of the objective with less than 16 samples is needed for application of Table 3.1. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
State Board Staff Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 31719, Boron Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	34178
Pollutant:	Boron
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Agricultural Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	None of the 4 samples analyzed exceeded the evaluation guideline of 0.7 mg/L.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Basin (NCRWQCB 2011): Waters designated for use as agricultural supply (AGR) shall not contain concentrations of chemical constituents in amounts which adversely affect such beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water, including irrigation of various types of crops and stock watering. At or below the limits presented in the Water Quality Goals tables, agricultural uses of water should not be limited. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The criteria for boron is 700 ug/L (0.7 mg/L).
Guideline Reference:	Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)
Spatial Representation:	Samples were collected from the Gualala River at Gualala Regional Park station (113GUAGRP).
Temporal Representation:	Samples were collected approximately quarterly from November 2007 to July 2008.
Environmental Conditions:
QAPP Information:	SWAMP QAPP
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan

DECISION ID	24502	Region 1
Mendocino Coast HU, Gualala River HA, Gualala River

Pollutant:	Chloride
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the Section 303(d) List under Section 3.2 of the Listing Policy. Under Section 3.2, a single line of evidence is necessary to assess listing status. Two lines of evidence are available to assess protection of the municipal and domestic supply (MUN) beneficial use in the mainstem Gualala River (LOEs 46931 and 33851), one line of evidence is available to assess protection of the MUN beneficial use in the Wheatfield Fork Gualala River (LOE 46932), and one line of evidence is available to assess protection of the MUN beneficial use in the South Fork Gualala River (LOE 46933). It should be noted that data from LOE 25445 from the 2010 Integrated Report cycle were re-evaluated this current cycle in LOEs 46931, 46932, and 46933. Zero of 26 samples from the mainstem Gualala River exceed the objective. Additionally, zero of 2 samples from the Wheatfield Fork Gualala River and zero of 4 samples from the South Fork Gualala River exceed the objective, however these sample sizes are insufficient to determine with the power and confidence of the Listing Policy if standards are not met, as a minimum of either (1) 26 samples, or (2) greater than or equal to 5 exceedances of the objective with less than 26 samples is needed for application of Table 3.2. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category (i.e., sufficient justification to not list). This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. (3) Zero of 26 samples from the mainstem Gualala River exceed the objective and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Staff Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 24502, Chloride Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	46933
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 4 chloride samples collected in the South Fork Gualala River exceed the evaluation guideline. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008). This LOE and LOEs 46931 and 46932 replace LOE 25445 from the 2010 Integrated Report cycle. The original LOE was split into three separate LOEs so that data from each stream could be evaluated separately.
Data Reference:	Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Per the Basin Plan (NCRWQCB 2007): Waters shall not contain taste- or odorproducing substances in concentrations that impart undesirable tastes or odors to fish flesh or other edible products of aquatic origin, or that cause nuisance or adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
Evaluation Guideline:	Per 22 CCR 64449: The recommended Secondary Maximum Contaminant Level for chloride is 250 mg/L.
Guideline Reference:	Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations
Spatial Representation:	Samples were collected from the South Fork Gualala River at 2 locations as follows: (1) from the South Fork Gualala River at Hauser Bridge (SWAMP Station ID 113SGUAHB) and (2) from the South Fork Gualala River at Annapolis Road (SWAMP Station ID 113GUASFK). Samples were collected from well-mixed flows in glides or riffles.
Temporal Representation:	Grab samples were collected during 2 site visits from each site from May to June 2001.
Environmental Conditions:	There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information:	Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 24502, Chloride Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	46932
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 2 chloride samples collected in the Wheatfield Fork Gualala River exceed the evaluation guideline. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008). This LOE and LOEs 46931 and 46933 replace LOE 25445 from the 2010 Integrated Report cycle. The original LOE was split into three separate LOEs so that data from each stream could be evaluated separately.
Data Reference:	Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Per the Basin Plan (NCRWQCB 2007): Waters shall not contain taste- or odorproducing substances in concentrations that impart undesirable tastes or odors to fish flesh or other edible products of aquatic origin, or that cause nuisance or adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
Evaluation Guideline:	Per 22 CCR 64449: The recommended Secondary Maximum Contaminant Level for chloride is 250 mg/L.
Guideline Reference:	Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations
Spatial Representation:	Samples were collected from the Wheatfield Fork Gualala River (SWAMP Station ID 113GUAWHT). Samples were collected from well-mixed flows in glides or riffles.
Temporal Representation:	Grab samples were collected during 2 site visits from the Wheatfield Fork Gualala River site from May to June 2001.
Environmental Conditions:	There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information:	Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 24502, Chloride Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	46931
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	22
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 22 chloride samples collected in the mainstem Gualala River exceed the evaluation guideline. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008). This LOE and LOEs 46932 and 46933 replace LOE 25445 from the 2010 Integrated Report cycle. The original LOE was split into three separate LOEs so that data from each stream could be evaluated separately.
Data Reference:	Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Per the Basin Plan (NCRWQCB 2007): Waters shall not contain taste- or odorproducing substances in concentrations that impart undesirable tastes or odors to fish flesh or other edible products of aquatic origin, or that cause nuisance or adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
Evaluation Guideline:	Per 22 CCR 64449: The recommended Secondary Maximum Contaminant Level for chloride is 250 mg/L.
Guideline Reference:	Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations
Spatial Representation:	Samples were collected from the mainstem Gualala River at 2 locations as follows: (1) from the Gualala River at House Creek (SWAMP Station ID 113GUAHSE) and (2) from the Gualala River at Gualala Regional Park (SWAMP Station ID 113GUAGRP). Samples were collected from well-mixed flows in glides or riffles.
Temporal Representation:	Grab samples were collected during 2 site visits from the Gualala River at House Creek site from May to June 2001. At the Gualala Regional Park site, samples were collected as grab samples during 20 sites visits from May 2001 to June 2006.
Environmental Conditions:	There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information:	Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 24502, Chloride Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	33851
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 4 samples collected exceeded the evaluation guideline.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Per the Basin Plan (NCRWQCB 2011): Waters shall not contain taste- or odor-producing substances in concentrations that impart undesirable tastes or odors to fish flesh or other edible products of aquatic origin, or that cause nuisance or adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	Per 22 CCR 64449: The recommended Secondary Maximum Contaminant Level for chloride is 250 mg/L.
Guideline Reference:	Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations
Spatial Representation:	Samples were collected from the Gualala River at Gualala Regional Park station (113GUAGRP).
Temporal Representation:	Samples were collected approximately once per quarter year from November 2007 to July 2008.
Environmental Conditions:
QAPP Information:	SWAMP QAPP
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 24502, Chloride Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	25445
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	28
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 28 chloride samples collected in the Gualala River exceed the evaluation guideline. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008).
Data Reference:	Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Per the Basin Plan (NCRWQCB 2007): Waters shall not contain taste- or odor-producing substances in concentrations that impart undesirable tastes or odors to fish flesh or other edible products of aquatic origin, or that cause nuisance or adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
Evaluation Guideline:	Per 22 CCR 64449: The recommended Secondary Maximum Contaminant Level for chloride is 250 mg/L.
Guideline Reference:	Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations
Spatial Representation:	Samples were collected from the Gualala River at 5 locations as follows: (1) from the Gualala River at House Creek (SWAMP Station ID 113GUAHSE), (2) from the Wheatfield Fork Gualala River (SWAMP Station ID 113GUAWHT), (3) from the South Fork Gualala River at Hauser Bridge (SWAMP Station ID 113SGUAHB), (4) from the South Fork Gualala River at Annapolis Road (SWAMP Station ID 113GUASFK), and (5) from the mainstem Gualala River at Gualala Regional Park (SWAMP Station ID 113GUAGRP). Samples were collected from well-mixed flows in glides or riffles.
Temporal Representation:	At all the sites but the Gualala Regional Park site, samples were collected as grab samples during 2 site visits from each site from May to June 2001. At the Gualala Regional Park site, samples were collected as grab samples during 20 sites visits from May 2001 to June 2006. At the Gualala Regional Park site, visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions:	There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information:	Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

DECISION ID	31394	Region 1
Mendocino Coast HU, Gualala River HA, Gualala River

Pollutant:	DDD (Dichlorodiphenyldichloroethane)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the Section 303(d) List under Section 3.1 of the Listing Policy. Under Section 3.1, a single line of evidence is necessary to assess listing status. One line of evidence is available to assess protection of the municipal and domestic supply (MUN) beneficial use. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category (i.e., sufficient justification to not list). This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of Section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of Section 6.1.5 of the Policy. (3) The method detection limit for all 3 of the non-detect samples was greater than the criteria. Thus, per the Listing Policy the data were not used in this assessment. Therefore, there are no data available to assess against protection of the MUN beneficial use. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
State Board Staff Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 31394, DDD (Dichlorodiphenyldichloroethane) Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	34561
Pollutant:	DDD (Dichlorodiphenyldichloroethane)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	The method detection limit for all 3 of the non-detect samples was greater than the criteria: thus the data was not used in this assessment.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The 4,4'-DDD criterion for the protection of human health from the consumption of water and organisms is 0.00031 ug/L (USEPA Nationally Recommended Criteria, 2006).
Objective/Criterion Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Samples collected at station 113GUAGRP (Gualala River at Gualala Regional Park).
Temporal Representation:	Samples were collected on 11/26/2007, 4/7/2008, and 7/14/2008.
Environmental Conditions:
QAPP Information:	SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan

DECISION ID	31395	Region 1
Mendocino Coast HU, Gualala River HA, Gualala River

Pollutant:	DDE (Dichlorodiphenyldichloroethylene)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the Section 303(d) List under Section 3.1 of the Listing Policy. Under Section 3.1, a single line of evidence is necessary to assess listing status. One line of evidence is available to assess protection of the municipal and domestic supply (MUN) beneficial use. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category (i.e., sufficient justification to not list). This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of Section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of Section 6.1.5 of the Policy. (3) The method detection limit for all 3 of the non-detect samples was greater than the criteria. Thus, per the Listing Policy the data were not used in this assessment. Therefore, there are no data available to assess against protection of the MUN beneficial use. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
State Board Staff Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 31395, DDE (Dichlorodiphenyldichloroethylene) Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	34562
Pollutant:	DDE (Dichlorodiphenyldichloroethylene)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	The method detection limit for all 3 of the non-detect samples was greater than the criteria: thus the data was not used in this assessment.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The 4,4'-DDE criterion for the protection of human health from the consumption of water and organisms is 0.00022 ug/L (USEPA Nationally Recommended Criteria, 2006).
Objective/Criterion Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Samples collected at station 113GUAGRP (Gualala River at Gualala Regional Park).
Temporal Representation:	Samples were collected on 11/26/2007, 4/7/2008, and 7/14/2008.
Environmental Conditions:
QAPP Information:	SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan

DECISION ID	31396	Region 1
Mendocino Coast HU, Gualala River HA, Gualala River

Pollutant:	DDT (Dichlorodiphenyltrichloroethane)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the Section 303(d) List under Section 3.1 of the Listing Policy. Under Section 3.1, a single line of evidence is necessary to assess listing status. )ne line of evidence is available to assess protection of the municipal and domestic supply (MUN) beneficial use and one line of evidence is available to assess protection of the cold freshwater habitat (COLD) beneficial use. Per the Listing Policy, data from LOE 34545 evaluating the MUN beneficial use could not be used in this decision as the method detection limit for the non-detect samples was greater than the criteria. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category (i.e., sufficient justification to not list). This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of Section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of Section 6.1.5 of the Policy. (3) Zero of three water samples exceed the COLD criteria, and this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are not met, as a minimum of either (A) 16 samples, or (B) greater than or equal 2 exceedances of the objective with less than 16 samples is needed for application of Table 3.1. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
State Board Staff Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 31396, DDT (Dichlorodiphenyltrichloroethane) Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	34544
Pollutant:	DDT (Dichlorodiphenyltrichloroethane)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 3 samples exceeded the criterion continuous concentration for 4,4' DDT. The water body was assessed for the sum of DDT(o,p') and DDT(p,p').
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The 4,4' DDT criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.001 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Samples collected at station 113GUAGRP (Gualala River at Gualala Regional Park).
Temporal Representation:	Samples collected between 11/26/2007, 4/7/2008, and 7/14/2008.
Environmental Conditions:
QAPP Information:	SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 31396, DDT (Dichlorodiphenyltrichloroethane) Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	34545
Pollutant:	DDT (Dichlorodiphenyltrichloroethane)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	The method detection limit for all 3 of the non-detect samples was greater than the criteria: thus the data was not used in this assessment.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The 4,4' DDT criterion for the protection of human health from the consumption of water and organisms is 0.00022 ug/L (USEPA Nationally Recommended Criteria, 2006).
Objective/Criterion Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Samples collected at station 113GUAGRP (Gualala River at Gualala Regional Park).
Temporal Representation:	Samples were collected on 11/26/2007, 4/7/2008, and 7/14/2008.
Environmental Conditions:
QAPP Information:	SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan

DECISION ID	31720	Region 1
Mendocino Coast HU, Gualala River HA, Gualala River

Pollutant:	Manganese
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the Section 303(d) List under Section 3.1 of the Listing Policy. Under Section 3.1, a single line of evidence is necessary to assess listing status. One line of evidence is available to assess protection of the municipal and domestic supply (MUN) beneficial use. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category (i.e., sufficient justification to not list). This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. (3) Zero of four samples exceed the objective, and this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are not met, as a minimum of either (A) 16 samples, or (B) greater than or equal 2 exceedances of the objective with less than 16 samples is needed for application of Table 3.1. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
State Board Staff Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 31720, Manganese Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42650
Pollutant:	Manganese
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Manganese.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Manganese is 0.05 mg/L.
Objective/Criterion Reference:	Secondary Maximum Contaminant Levels and Compliance. CCR title 22 section 64449.
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan

DECISION ID	32008	Region 1
Mendocino Coast HU, Gualala River HA, Gualala River

Pollutant:	Nitrate/Nitrite (Nitrite + Nitrate as N)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the Section 303(d) List under Section 3.1 of the Listing Policy. Under Section 3.1, a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant in the mainstem Gualala River (LOE 43070). Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the Section 303(d) List in the Water Quality Limited Segments category (i.e., sufficient justification to not list). This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of Section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of Section 6.1.5 of the Policy. (3) Zero of four samples from the mainstem Gualala River exceed the water quality objective, however this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are not met, as a minimum of either (a) 16 samples, or (b) greater than or equal to 2 exceedances of the objective with less than 16 samples is needed for application of Table 3.1. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
State Board Staff Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 32008, Nitrate/Nitrite (Nitrite + Nitrate as N) Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	43070
Pollutant:	Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Nitrate/Nitrite as N.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nitrate+nitrite (sum as nitrogen) is 10.0 mg/L.
Objective/Criterion Reference:	Maximum Contaminant Levels for organic and inorganic chemicals. CCR
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan

DECISION ID	32029	Region 1
Mendocino Coast HU, Gualala River HA, Gualala River

Pollutant:	Nitrite
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the Section 303(d) List under Section 3.1 of the Listing Policy. Under Section 3.1, a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant in the mainstem Gualala River (LOE 42995). Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the Section 303(d) List in the Water Quality Limited Segments category (i.e., sufficient justification to not list). This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of Section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of Section 6.1.5 of the Policy. (3) Zero of four samples from the mainstem Gualala River exceed the water quality objective, however this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are not met, as a minimum of either (a) 16 samples, or (b) greater than or equal to 2 exceedances of the objective with less than 16 samples is needed for application of Table 3.1. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
State Board Staff Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 32029, Nitrite Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	42995
Pollutant:	Nitrite
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Nitrite as N.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.
Objective/Criterion Reference:	Maximum Contaminant Levels for organic and inorganic chemicals. CCR
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan

DECISION ID	28075	Region 1
Mendocino Coast HU, Gualala River HA, Gualala River

Pollutant:	Nitrogen, ammonia (Total Ammonia)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the Section 303(d) List under Section 3.1 of the Listing Policy. Under Section 3.1, a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess the Cold Freshwater Habitat (COLD) beneficial use, and one line of evidence is available to assess the Spawning, Reproduction, and/or Early Development (SPWN) beneficial use. It should be noted that the pollutant name was changed from "Ammonia as Nitrogen" to "Nitrogen, ammonia (Total Ammonia)". Zero of 27 samples exceed the COLD evaluation guideline. Additionally, zero of 4 samples exceed the SPWN evaluation guideline, however, this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are not met, as a minimum of either (A) 16 samples, or (B) greater than or equal 2 exceedances of the objective with less than 16 samples is needed for application of Table 3.1 Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category (i.e., sufficient justification to not list). This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of Section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of Section 6.1.5 of the Policy. (3) Zero of 27 samples exceed the COLD evaluation guideline and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Staff Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 28075, Nitrogen, ammonia (Total Ammonia) Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	34557
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Fish Spawning
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the samples exceed the water USEPA Temperature and pH-Dependent values of the CCC (Chronic Criterion) for Fish Early Life Stages Present for ammonia. 1 of the 4 data are reported as non-detect limits. These non-detect limits are less than or equal to the water quality standard, the value will be considered as meeting the water quality standard, objective, criterion, or evaluation guideline.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	Update of Ambient Water Quality Criteria for Ammonia (USEPA 1999): Where salmonids and fish early life stages are present, the 30-day average concentration (criterion continuous concentration or CCC) of total ammonia (as mg N/L) in freshwater are not to be exceeded more than once every three years on average. The CCC values are based on pH, temperature, and the presence of early life stages of fish. The CCC formula is found on p.83 and the table of CCC values are found on p.87.
Guideline Reference:	1999 Update of Ambient Water Quality Criteria for Ammonia
Spatial Representation:	Sample was collected at 113GUAGRP (Gualala River at Gualala Regional Park).
Temporal Representation:	Samples collected between 11/26/2007 and 7/14/2008.
Environmental Conditions:
QAPP Information:	SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 28075, Nitrogen, ammonia (Total Ammonia) Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	26329
Pollutant:	Ammonia as Nitrogen
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Fish Migration | Fish Spawning | Preservation of Rare & Endangered Species | Wildlife Habitat
Number of Samples:	27
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 27 ammonia as nitrogen samples collected from the Gualala River exceed the objective. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008).
Data Reference:	Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Per the Basin Plan (NCRWQCB 2007): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
Evaluation Guideline:	Per the National Recommended Water Quality Criteria (USEPA 2006): The 1-hour average concentration (acute criterion or CMC) of total ammonia nitrogen (in mg N/L) for freshwater where salmonid fish are present, which is not to be exceeded more than once every three years on average, is calculated using the following equation: CMC=0.275/(1+10^(7.204 - pH)) + 39.0/(1+10^(pH - 7.204)).
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
Spatial Representation:	Samples were collected from the Gualala River at 5 locations as follows: (1) from the Gualala River at House Creek (SWAMP Station ID 113GUAHSE), (2) from the Wheatfield Fork Gualala River (SWAMP Station ID 113GUAWHT), (3) from the South Fork Gualala River at Hauser Bridge (SWAMP Station ID 113SGUAHB), (4) from the South Fork Gualala River at Annapolis Road (SWAMP Station ID 113GUASFK), and (5) from the mainstem Gualala River at Gualala Regional Park (SWAMP Station ID 113GUAGRP). Samples were collected from well-mixed flows in glides or riffles.
Temporal Representation:	At all the sites but the Gualala Regional Park site, samples were collected as grab samples during 2 site visits from each site from May to June 2001. At the Gualala Regional Park site, samples were collected as grab samples during 20 sites visits from May 2001 to June 2006. At the Gualala Regional Park site, visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions:	There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information:	Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (Puckett 2002).
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

DECISION ID	31634	Region 1
Mendocino Coast HU, Gualala River HA, Gualala River

Pollutant:	Oxygen, Dissolved
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under this section of the policy, a minimum of one line of evidence is needed to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the Section 303(d) list in the Water Quality Limited Segments category (i.e., sufficient justification to not list). This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of Section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of Section 6.1.5 of the Policy. (3) Zero of four samples from the mainstem Gualala River exceed the objective, and this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are not met, as a minimum of either (A) 26 samples, or (B) greater than or equal to 5 exceedances of the objective with less than 26 samples is needed for application of Table 3.2. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
State Board Staff Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 31634, Oxygen, Dissolved Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	34128
Pollutant:	Oxygen, Dissolved
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 4 samples exceeded the objective.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The site specific objective for the Gualala River is a minimum value of 7.0 mg/L. In addition, the 90% lower limit for this pollutant is 7.5 mg/L. Therefore, 90% of the values in a calendar year must be lower than this limit. Lastly, the site specific objective of 50% lower limit of 10 mg/L which represents the 50 percentile values of the monthly means for a calendar year applies to this water body. Therefore, 50% or more of the monthly means in a calendar year must be less than or equal to an upper limit.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Samples were collected from the Gualala River at Gualala Regional Park station (113GUAGRP).
Temporal Representation:	Samples were collected approximately once per quarter year from November 2007 to July 2008.
Environmental Conditions:
QAPP Information:	SWAMP QAPP
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan

DECISION ID	24562	Region 1
Mendocino Coast HU, Gualala River HA, Gualala River

Pollutant:	PCBs (Polychlorinated biphenyls)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the Section 303(d) List under Section 3.1 of the Listing Policy. Under Section 3.1, a single line of evidence is necessary to assess listing status. One line of evidence is available to assess protection of the cold freshwater habitat (COLD) beneficial use and two lines of evidence are available to assess protection of the municipal and domestic supply (MUN) beneficial use. Zero of 200 water samples exceed the MUN water quality objective. Additionally zero of one two water samples exceed the COLD objective, however this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are not met, as a minimum of either (a) 16 samples, or (b) greater than or equal to 2 exceedances of the objective with less than 16 samples is needed for application of Table 3.1. Per the Listing Policy, data from LOE 33308 could not be used in this decision as the method detection limit for the non-detect samples was greater than the criteria. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category (i.e., sufficient justification to not list). This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of Section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of Section 6.1.5 of the Policy. (3) Zero of 200 water samples exceed the MUN water quality objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Staff Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 24562, PCBs (Polychlorinated biphenyls) Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	33308
Pollutant:	PCBs (Polychlorinated biphenyls)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	The method detection limit for all 3 of the non-detect samples was greater than the criteria: thus the data was not used in this assessment.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The total PCB criterion for the protection of human health from the consumption of water and organisms is 0.00017 ug/L. This value corresponds to total PCBs, eg., the sum of all congener or isomer or homolog or aroclor analyses (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Samples collected at station 113GUAGRP (Gualala River at Gualala Regional Park).
Temporal Representation:	Samples were collected on 11/26/2007, 4/7/2008, and 7/14/2008.
Environmental Conditions:
QAPP Information:	SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 24562, PCBs (Polychlorinated biphenyls) Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	33307
Pollutant:	PCBs (Polychlorinated biphenyls)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 2 samples exceeded the criterion continuous concentration for total PCB. The water body was assessed for the 3 aroclors that were contained within the data set and they include aroclor 1248, aroclor 1254, and aroclor 1260.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The total PCB criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.014 ug/L. This value corresponds to the sum of aroclors 1242, 1254, 1221, 1232, 1248, 1260, and 1016 (California Toxics Rule, 2000).
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Samples collected at station 113GUAGRP (Gualala River at Gualala Regional Park).
Temporal Representation:	Samples collected on 4/7/2008 and 7/14/2008.
Environmental Conditions:
QAPP Information:	SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 24562, PCBs (Polychlorinated biphenyls) Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	25470
Pollutant:	PCBs (Polychlorinated biphenyls)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	200
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 200 polychlorinated biphenyl (PCB) analytes collected in the Gualala River exceed the evaluation guideline. Each of the 4 samples were analyzed for 50 PCB cogeners. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the 5-Year Monitoring Report (NCRWQCB 2008).
Data Reference:	Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Per the Basin Plan (NCRWQCB 2007, p. 3-4.00): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
Evaluation Guideline:	Per the "Public Health Goal for Water Soluble Polychlorinated Biphenyls Expected to Found in Drinking Water" (OEHHA 2007): The health-protective concentration of water-soluble PCBs in drinking water associated with a one in one million extra lifetime cancer risk is 0.09 ug/L.
Guideline Reference:	Public Health Goal for Water Soluble Polychlorinated Biphenyls Expected to Be Found in Drinking Water. Pesticide and Environmental Toxicology Branch, Office of Environmental Health Hazard Assessment, California Environmental Protection Agency
Spatial Representation:	Samples were collected from the Gualala River from the mainstem Gualala River at Gualala Regional Park (SWAMP Station ID 113GUAGRP). Samples were collected from well-mixed flows in glides or riffles.
Temporal Representation:	Samples were collected as grab samples during 20 sites visits from May 2001 to June 2006. Visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions:	There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information:	Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

DECISION ID	31397	Region 1
Mendocino Coast HU, Gualala River HA, Gualala River

Pollutant:	Phenol
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the Section 303(d) List under Section 3.1 of the Listing Policy. Under Section 3.1, a single line of evidence is necessary to assess listing status. One line of evidence is available to assess protection of the warm freshwater habitat (WARM) beneficial use and one line of evidence is available to assess protection of the cold freshwater habitat (COLD) beneficial use. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category (i.e., sufficient justification to not list). This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of Section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of Section 6.1.5 of the Policy. (3) Zero of three water samples exceed the criteria used to interpret the narrative objective for both WARM and COLD, and this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are not met, as a minimum of either (A) 16 samples, or (B) greater than or equal 2 exceedances of the objective with less than 16 samples is needed for application of Table 3.1. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
State Board Staff Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 31397, Phenol Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	43001
Pollutant:	Nonylphenol
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Nonylphenol.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to nonylphenol is 6.6 ug/L.
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 31397, Phenol Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	43077
Pollutant:	Nonylphenol
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Nonylphenol.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to nonylphenol is 6.6 ug/L.
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan

DECISION ID	27319	Region 1
Mendocino Coast HU, Gualala River HA, Gualala River

Pollutant:	Specific Conductivity
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under this section of the policy, a minimum of one line of evidence is needed to assess listing status. Two lines of evidence is available in the administrative record to assess this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. (3) None of thirty-two samples exceed the objective, and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. (4) Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Staff Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 27319, Specific Conductivity Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	21320
Pollutant:	Specific Conductivity
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	28
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 28 specific conductivity grab samples collected from the Gualala River exceed the objective. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008).
Data Reference:	Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Per the Basin Plan (NCRWQCB 2007): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
Evaluation Guideline:	Per 22 CCR 64449: The recommended secondary Maximum Contaminant Level (MCL) is 900 uS/cm.
Guideline Reference:	Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations
Spatial Representation:	Samples were collected from the Gualala River at 5 locations as follows: (1) from the Gualala River at House Creek (SWAMP Station ID 113GUAHSE), (2) from the Wheatfield Fork Gualala River (SWAMP Station ID 113GUAWHT), (3) from the South Fork Gualala River at Hauser Bridge (SWAMP Station ID 113SGUAHB), (4) from the South Fork Gualala River at Annapolis Road (SWAMP Station ID 113GUASFK), and (5) from the mainstem Gualala River at Gualala Regional Park (SWAMP Station ID 113GUAGRP). Samples were collected from well-mixed flows in glides or riffles.
Temporal Representation:	At all the sites but the Gualala Regional Park site, samples were collected as grab samples during 2 site visits from each site from May to June 2001. At the Gualala Regional Park site, samples were collected as grab samples during 20 sites visits from May 2001 to June 2006. At the Gualala Regional Park site, visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions:	There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information:	Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (Puckett 2002).
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 27319, Specific Conductivity Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	44457
Pollutant:	Specific Conductivity
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Mendocino Coast HU, Gualala River HA, Gualala River to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Specific Conductivity.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Specific Conductance is 900 uS/cm.
Objective/Criterion Reference:	Secondary Maximum Contaminant Levels and Compliance. CCR title 22 section 64449.
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Mendocino Coast HU, Gualala River HA, Gualala River was collected at 1 monitoring site [ Gualala River at Gualala Regional Park - 113GUAGRP]
Temporal Representation:	Data was collected over the time period 11/26/2007-7/14/2008.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan

DECISION ID	24670	Region 1
Mendocino Coast HU, Gualala River HA, Gualala River

Pollutant:	Sulfates
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the Section 303(d) List under Section 3.2 of the Listing Policy. Under Section 3.2, a single line of evidence is necessary to assess listing status. Two lines of evidence are available to assess protection of the municipal and domestic supply (MUN) beneficial use in the mainstem Gualala River (LOEs 46948 and 33860), one line of evidence is available to assess protection of the MUN beneficial use in the South Fork Gualala River (LOE 46950), and one line of evidence is available to assess protection of the MUN beneficial use in the Wheatfield Fork Gualala River (LOE 46949). It should be noted that data from LOE 25554 from the 2010 Integrated Report cycle were re-evaluated this current cycle in LOEs 46948, 46949, and 46950. Zero of 26 samples from the mainstem Gualala River exceed the objective. Additionally, zero of 2 samples from both the South Fork Gualala River and the Wheatfield Fork Gualala River exceed the objective, however these sample sizes are insufficient to determine with the power and confidence of the Listing Policy if standards are not met, as a minimum of either (1) 26 samples, or (2) greater than or equal to 5 exceedances of the objective with less than 26 samples is needed for application of Table 3.2. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category (i.e., sufficient justification to not list). This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. (3) Zero of 26 samples from the mainstem Gualala River exceed the objective and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Staff Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 24670, Sulfates Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	46948
Pollutant:	Sulfates
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	22
Number of Exceedances:	0
Data and Information Type:	Fixed station physical/chemical monitoring (conventional pollutants only)
Data Used to Assess Water Quality:	None of the 22 sulfate samples collected in the mainstem Gualala River exceed the evaluation guideline. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the 5-Year Monitoring Report (NCRWQCB 2008). This LOE and LOEs 46949 and 46950 replace LOE 25554 from the 2010 Integrated Report cycle. The original LOE was replaced so that each stream could be assess in its own, individual LOE.
Data Reference:	Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Per the Basin Plan (NCRWQCB 2007, p. 3-3.00): Waters shall not contain taste- or odor-producing substances in concentrations that impart undesirable tastes or odors to fish flesh or other edible products of aquatic origin, or that cause nuisance or adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
Evaluation Guideline:	Per 22 CCR 64449 (Table 64449-B): The recommended secondary maximum contaminant level for sulfate is 250 mg/L.
Guideline Reference:	Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations
Spatial Representation:	Samples were collected from the Gualala River at 2 locations as follows: (1) from the Gualala River at House Creek (SWAMP Station ID 113GUAHSE) and (2) from the Gualala River at Gualala Regional Park (SWAMP Station ID 113GUAGRP). Samples were collected from well-mixed flows in glides or riffles.
Temporal Representation:	Samples were collected in the Gualala River at House Creek as grab samples during 2 site visits from each site from May to June 2001. At the Gualala Regional Park site, samples were collected as grab samples during 20 sites visits from May 2001 to June 2006. At the Gualala Regional Park site, visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions:	There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information:	Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 24670, Sulfates Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	33860
Pollutant:	Sulfates
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 4 samples exceeded the evaluation guideline.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Per the Basin Plan (NCRWQCB 2011): Waters shall not contain taste- or odor-producing substances in concentrations that impart undesirable tastes or odors to fish flesh or other edible products of aquatic origin, or that cause nuisance or adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	Per 22 CCR 64449 (Table 64449-B): The recommended secondary maximum contaminant level for sulfate is 250 mg/L.
Guideline Reference:	Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations
Spatial Representation:	Samples were collected from the Gualala River at Gualala Regional Park station (113GUAGRP).
Temporal Representation:	Samples were collected approximately once per quarter year from November 2007 to July 2008.
Environmental Conditions:
QAPP Information:	SWAMP QAPP
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan
Line of Evidence (LOE) for Decision ID 24670, Sulfates Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	25554
Pollutant:	Sulfates
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	26
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 26 sulfate samples collected in the Gualala River exceed the evaluation guideline. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the 5-Year Monitoring Report (NCRWQCB 2008).
Data Reference:	Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Per the Basin Plan (NCRWQCB 2007, p. 3-3.00): Waters shall not contain taste- or odor-producing substances in concentrations that impart undesirable tastes or odors to fish flesh or other edible products of aquatic origin, or that cause nuisance or adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
Evaluation Guideline:	Per 22 CCR 64449 (Table 64449-B): The recommended secondary maximum contaminant level for sulfate is 250 mg/L.
Guideline Reference:	Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations
Spatial Representation:	Samples were collected from the Gualala River at 4 locations as follows: (1) from the Gualala River at House Creek (SWAMP Station ID 113GUAHSE), (2) from the Wheatfield Fork Gualala River (SWAMP Station ID 113GUAWHT), (3) from the South Fork Gualala River at Annapolis Road (SWAMP Station ID 113GUASFK), and (4) from the mainstem Gualala River at Gualala Regional Park (SWAMP Station ID 113GUAGRP). Samples were collected from well-mixed flows in glides or riffles.
Temporal Representation:	At all the sites but the Gualala Regional Park site, samples were collected as grab samples during 2 site visits from each site from May to June 2001. At the Gualala Regional Park site, samples were collected as grab samples during 20 sites visits from May 2001 to June 2006. At the Gualala Regional Park site, visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions:	There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information:	Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 24670, Sulfates Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	46949
Pollutant:	Sulfates
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	Fixed station physical/chemical monitoring (conventional pollutants only)
Data Used to Assess Water Quality:	None of the 2 sulfate samples collected in the Wheatfield Fork Gualala River exceed the evaluation guideline. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the 5-Year Monitoring Report (NCRWQCB 2008). This LOE and LOEs 46948 and 46950 replace LOE 25554 from the 2010 Integrated Report cycle. The original LOE was replaced so that each stream could be assess in its own, individual LOE.
Data Reference:	Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Per the Basin Plan (NCRWQCB 2007, p. 3-3.00): Waters shall not contain taste- or odor-producing substances in concentrations that impart undesirable tastes or odors to fish flesh or other edible products of aquatic origin, or that cause nuisance or adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
Evaluation Guideline:	Per 22 CCR 64449 (Table 64449-B): The recommended secondary maximum contaminant level for sulfate is 250 mg/L.
Guideline Reference:	Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations
Spatial Representation:	Samples were collected from the Wheatfield Fork Gualala River (SWAMP Station ID 113GUAWHT).
Temporal Representation:	Samples were collected as grab samples during 2 site visits from each site from May to June 2001.
Environmental Conditions:	There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information:	Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 24670, Sulfates Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	46950
Pollutant:	Sulfates
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	Fixed station physical/chemical monitoring (conventional pollutants only)
Data Used to Assess Water Quality:	None of the 2 sulfate samples collected in the South Fork Gualala River exceed the evaluation guideline. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the 5-Year Monitoring Report (NCRWQCB 2008). This LOE and LOEs 46948 and 46949 replace LOE 25554 from the 2010 Integrated Report cycle. The original LOE was replaced so that each stream could be assess in its own, individual LOE.
Data Reference:	Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Per the Basin Plan (NCRWQCB 2007, p. 3-3.00): Waters shall not contain taste- or odor-producing substances in concentrations that impart undesirable tastes or odors to fish flesh or other edible products of aquatic origin, or that cause nuisance or adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
Evaluation Guideline:	Per 22 CCR 64449 (Table 64449-B): The recommended secondary maximum contaminant level for sulfate is 250 mg/L.
Guideline Reference:	Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations
Spatial Representation:	Samples were collected from the South Fork Gualala River at Annapolis Road (SWAMP Station ID 113GUASFK).
Temporal Representation:	Samples were collected as grab samples during 2 site visits from each site from May to June 2001.
Environmental Conditions:	There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information:	Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

DECISION ID	31187	Region 1
Mendocino Coast HU, Gualala River HA, Gualala River

Pollutant:	Total Dissolved Solids
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under this section of the policy, a minimum of one line of evidence is needed to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. (3) Zero of four samples from the mainstem Gualala River exceed the objective, and this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are not met, as a minimum of either (A) 26 samples, or (B) greater than or equal 5 exceedances of the MUN objective with less than 26 samples is needed for application of Table 3.2. (4) Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
State Board Staff Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 31187, Total Dissolved Solids Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	34281
Pollutant:	Total Dissolved Solids
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 4 samples exceeded the recommended level of 500 mg/L.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. For Total Dissolved Solids (TDS), the secondary MCL recommended range is 500 mg/l, the upper range is 1000 mg/l, and the short term range is 1500 mg/l. The recommended range of 500 mg/L was used for the purpose of this assessment.
Objective/Criterion Reference:	Secondary Maximum Contaminant Levels and Compliance. CCR title 22 section 64449.
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Samples collected at station 113GUAGRP (Gualala River at Gualala Regional Park).
Temporal Representation:	Samples were collected on 11/26/2007, 4/7/2008, 7/14/2008, and 3/3/2008.
Environmental Conditions:
QAPP Information:	SWAMP QAPP (2008) was followed.
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan

DECISION ID	31146	Region 1
Mendocino Coast HU, Gualala River HA, Gualala River

Pollutant:	pH
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under section 3.2 a minimum of one line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. (3) Zero of four samples from the Gualala River (LOE 34187) exceed the objective, and this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are not met, as a minimum of either (A) 26 samples, or (B) greater than or equal 5 exceedances of the objective with less than 26 samples is needed for application of Table 3.2. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
State Board Staff Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 31146, pH Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	34187
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 4 samples exceeded the objective.
Data Reference:	RWB1 Trend Maintenance Periods FYs 2007 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the lower limit pH for this water body is 6.5, and the upper limit pH for this water body is 8.5.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Samples were collected from the Gualala River at Gualala Regional Park station (113GUAGRP).
Temporal Representation:	Samples were collected approximately once per quarter year from November 2007 to July 2008.
Environmental Conditions:
QAPP Information:	SWAMP QAPP
QAPP Information Reference(s):	Surface Water Ambient Monitoring Program Quality Assurance Program Plan

DECISION ID	19637	Region 1
Mendocino Coast HU, Gualala River HA, Gualala River

Pollutant:	Sedimentation/Siltation
Final Listing Decision:	List on 303(d) list (being addressed by USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (being addressed by USEPA approved TMDL)(2010)
Revision Status	Original
Sources:	Disturbed Sites (Land Develop.) | Erosion/Siltation | Flow Alteration/Regulation/Modification | Harvesting, Restoration, Residue Management | Highway/Road/Bridge Construction | Land Development | Logging Road Construction/Maintenance | Nonpoint Source | Removal of Riparian Vegetation | Silviculture | Specialty Crop Production
TMDL Name:	Gualala River Sediment
TMDL Project Code:	96
Date TMDL Approved by USEPA:	01/01/2004
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Regional Water Board Conclusion: This pollutant was considered for placement on the section 303(d) List in a previous Integrated Report cycle. No new information was reviewed for this current Integrated Report cycle. Therefore, the previous conclusion remains unchanged, and is as follows: This pollutant is being considered for listing under section 2.2 of the Listing Policy. Under this section of the Policy, a minimum of one line of evidence is needed to assess listing status. A TMDL addressing sediment impairments was established by the U.S. Environmental Protection Agency (USEPA) in December 2001. Based on the readily available information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination in the Water Quality Limited Segments Being Addressed portion of the section 303(d) list.
Regional Board Decision Recommendation:	No new data were assessed for this assessment cycle. The conclusion reached in the previous cycle remains the same. The Regional Board will update this decision when new data and information become available in a future assessment cycle.
State Board Staff Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 19637, Sedimentation/Siltation Region 1      Mendocino Coast HU, Gualala River HA, Gualala River
LOE ID:	1703
Pollutant:	Sedimentation/Siltation
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Not Specified
Data Used to Assess Water Quality:	Unspecified—This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference:	Placeholder reference 2006 303(d)
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:
Objective/Criterion Reference:
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information:	QA Info Missing
QAPP Information Reference(s):