Draft California 2024 Integrated Report (303(d) List/305(b) Report)

Supporting Information

Regional Board 1 - North Coast Region

Water Body Name:	MacKerricher State Park (near Mill Creek)
Water Body ID:	CAC1132005220081013230607
Water Body Type:	Coastal & Bay Shoreline


DECISION ID	121603	Region 1
MacKerricher State Park (near Mill Creek)

Pollutant:	Trash
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 CWA section 303(d) List under section 3.7 of the Listing Policy. One line of evidence is available to assess this pollutant. For trash data, there is no appropriate interpretive evaluation guideline that meets the requirements set forth in Section 6.1.3 of the Listing Policy for ocean beaches in the North Coast Region. Without an appropriate evaluation guideline, it is not possible to determine if the quantity of trash collected on the beach constitutes an exceedance of the trash water quality objective. Based on the readily available data and information, the weight of evidence indicates that there is insufficient information to place this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. It is unknown if the data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. It is unknown if the data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. An evaluation guideline meeting the requirements of Section 6.1.3 of the Listing Policy was unavailable. 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:	This decision was made by SWRCB staff.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWCRB staff conclude that there is insufficient information to place this waterbody-pollutant combination on the 303(d) list.

Line of Evidence (LOE) for Decision ID 121603, Trash	Region 1
MacKerricher State Park (near Mill Creek)

LOE ID:

198734

Pollutant:

Trash

LOE Subgroup:

Pollutant-Nuisance

Matrix:

-N/A

Fraction:

None

Beneficial Use:

Non-Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Volunteers collected trash, categorized the types, and provided the total weight of all trash in pounds, during one-day cleanup events on 09/25/2010, 09/15/2012, 09/21/2013, 09/20/2014, and 9/19/2015, with totals of 86, 46, 45, 70, and 3 lbs., respectively. There were counts of numbers of pieces of 41 separate categories of trash (e.g., cigarette butts, bottles, grocery bags).

Data Reference:

Dataset provided by the Center for Biological Diversity. Contains trash data from California Coastal Comission-sponsored beach cleanup days in the North Coast Region at nine sites: Clam Beach County Park, North Jetty/Samoa Dunes Recreation Area, South Jetty/South Spit, Trinidad State Beach, Glass Beach, MacKerricher State Park, Ten Mile Beach, North Salmon Creek Beach, and South Salmon Creek Beach.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Trash shall not be present in ocean waters, along shorelines or adjacent areas in amounts that adversely affect beneficial uses or cause nuisance. (California Ocean Plan, 2019).

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

A single set of coordinates was provided, representing an unspecified area of MacKerricker State Park: Latitude, 39.4943; longitude, -123.793.

Temporal Representation:

Samples were taken on five different one-day cleanup events on 9/25/2010, 09/15/2012, 09/21/2013, 09/20/2014, and 9/19/2015.

Environmental Conditions:

QAPP Information:

A "Site Captain Guide" document was provided, which included instructions to volunteers for a trash clean-up day. The document does not meet Listing Policy guidelines as a QAPP document.

QAPP Information Reference(s):

Site Captain Guide 2017


DECISION ID	78385	Region 1
MacKerricher State Park (near Mill Creek)

Pollutant:	Indicator Bacteria
Final Listing Decision:	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)(2016)
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2022
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Fecal indicator bacteria (which includes enterococcus, fecal coliform, and total colifrom) are being considered for placement on the Section 303(d) list under Section 3.3 of the Listing Policy. Under this section a single line of evidence (LOE) is necessary to assess listing status. Five LOEs are available in the administrative record to assess indicator bacteria in this water body for the protection of water contact recreation (REC-1). Additionally, one LOE for total coliform were assessed for the protection of shellfish harvesting (SHELL). Data from LOE 44735 were re-evaluated with LOEs 133639 and 133696. Data from LOE 32753 were re-evaluated with LOEs 133669 and 133691. Data from LOE 25320 were re-evaluated with LOEs 133639, 133696, 133669, and 133691. Data from LOEs 47616 and 47615 were re-evaluated with LOE 133666. The data assessed were ocean beach bacteria data collected in accordance with AB411 (Chapter 765, Statutes of 1997) requirements. In accordance with Section 3.3 of the Listing Policy, a 4% exceedance rate shall be used to add waters to the List "if water quality monitoring was conducted April 1 through October 31 only". However, data were collected outside of that date range and a 10% exceedance rate shall be used to assess waters in accordance with Section 3.3 for the listing policy. LOEs 133691 and 133696 were not used in this assessment as they were evaluated at a 4% exceedance rate. The following summary presents the total number of exceedances and total sample count: 1) 3 of 48 samples exceed the statistical threshold value (STV) objective for enterococcus for REC-1; 2) 2 of 112 samples exceed the geometric mean objective for enterococcus for REC-1; 3) 1 of 178 samples exceed the singles sample maximum objective for fecal coliform for REC-1; 4) 0 of 112 samples exceed the geometric mean objective for fecal coliform for REC-1; 5) 33 of 162 samples exceed the median concentration objective for total coliform for SHELL. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for adding this water segment-pollutant combination to the Section 303(d) list. While REC-1 is currently protected, SHELL is impaired. This conclusion is based on the staff findings that: (1) The data used satisfy the data quality requirements of Section 6.1.4 of the Policy. (2) The data used satisfy the data quantity requirements of Section 6.1.5 of the Policy. (3) Enterococcus, fecal coliform, and total coliform samples do not exceed the objectives more than the allowable frequency identified in Section 3.3 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 be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board 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 78385, Indicator Bacteria	Region 1
MacKerricher State Park (near Mill Creek)

LOE ID:

47616

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Shellfish Harvesting

Number of Samples:

104

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

5 of 104 samples exceed the objective of 230 MPN/100mL applied as a single sample maximum for Total Coliform.

Data Reference:

Data for Region 1 Beach Watch.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Ocean Plan states the following: At all areas where shellfish may be harvested for human consumption, the following bacterial objectives shall be maintained throughout the water column: Ten percent of the samples collected during any 30-day period shall not exceed 230 MPN/100mL.

Objective/Criterion Reference:

California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for MacKerricher State Park (near Mill Creek) was collected at 1 monitoring site [Mackerricher]

Temporal Representation:

Data was collected over the time period 4/2/2007-8/24/2010.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The samples were collected for the Beach Watch program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 78385, Indicator Bacteria	Region 1
MacKerricher State Park (near Mill Creek)

LOE ID:

47615

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Shellfish Harvesting

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

9 of 88 samples exceed the objective of 70 MPN/100mL applied as a rolling 30 day geomean for Total Coliform.

Data Reference:

Data for Region 1 Beach Watch.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Ocean Plan states that at all areas where shellfish may be harvested for human consumption, the median total coliform density shall not exceed 70 per 100 mL. Staff applied the objective as a rolling 30 day geometric mean consistent with other state bacteria objectives and with guidance from the National Shellfish Sanitation Program from which the objectives were taken.

Objective/Criterion Reference:

California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for MacKerricher State Park (near Mill Creek) was collected at 1 monitoring site [Mackerricher]

Temporal Representation:

Data was collected over the time period 4/2/2007-8/24/2010.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The samples were collected for the Beach Watch program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 78385, Indicator Bacteria	Region 1
MacKerricher State Park (near Mill Creek)

LOE ID:

25319

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

None of the 74 single samples of fecal coliform collected at MacKerricher State Park exceed the objective. Additionally, none of the 24 30-day geomean values exceed the objective. The single sample and geomean values are two different matrices used Mendocino County Division of Environmental Health in accordance with AB411 (Chapter 765, Statutes of 1997) requirements. Data is maintained by the State Water Board's Beach Watch program. Data is summarized by the North Coast Regional Water Board (North Coast RWQCB 2007).

Data Reference:

North Coast Beach Watch Data. Bacteria data collected by Del Norte County, Humboldt County, Mendocino County Environmental Health Division, Sonoma County Division of Environmental Health, and Marin County in accordance with AB411. Data managed by the State Water Resources Control Board's Beach Watch program at beachwatch.waterboards.ca.gov. Includes data from 2004 to 2006

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Per the Ocean Plan (SWRCB 2005): The following bacterial objectives shall be maintained throughout the water column. The following standard is based on the 30-day geometric mean of the five most recent samples from each site: Fecal coliform density shall not exceed 200 MPN per 100 ml. The following standard is for the single sample maximum: Fecal coliform density shall not exceed 400 per 100ml. *Note: MPN is the most probable number of coliform units.

Objective/Criterion Reference:

Water Quality Control Plan Ocean Waters of California. California Ocean Plan 2005. Sacramento, CA: State Water Resources Control Board, California Environmental Protection Agency

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at MacKerricher State Park .

Temporal Representation:

Samples were collected weekly from July to October 2005 and April to October 2006.

Environmental Conditions:

Samples were collected during the dry season. Otherwise, there are no known environmental conditions (e.g., land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Samples were collected and analyzed in accordance with the Sampling and Analysis Plan and the Laboratories and Laboratory Analyses procedures described in the "Draft Guidance for Salt Water Beaches" (DHS 2006).

QAPP Information Reference(s):

Draft Guidance for Salt Water Beaches. Last Update: April 10, 2006. Initial Draft: November 1997. Division of Drinking Water and Environmental Management, California Department of Health Services

Line of Evidence (LOE) for Decision ID 78385, Indicator Bacteria	Region 1
MacKerricher State Park (near Mill Creek)

LOE ID:

32755

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Zero of the 88 geomeans exceeded the objective.

Data Reference:

Data for Region 1 Beach Watch.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The geometric mean standard for fecal coliform states that the coliform density shall not exceed 200 MPN per 100 mL. Water Quality Control Plan for Ocean Waters (SWRCB 2009).

Objective/Criterion Reference:

California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at MacKerricher State Park near Mill Creek.

Temporal Representation:

Samples were collected approximately once a week from 2007 to 2010.

Environmental Conditions:

QAPP Information:

The samples were collected for the beach watch program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 78385, Indicator Bacteria	Region 1
MacKerricher State Park (near Mill Creek)

LOE ID:

44598

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

104

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

1 of 104 samples exceed the criterion for Fecal Coliform.

Data Reference:

Data for Region 1 Beach Watch.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2009) states that the single sample maximum for fecal coliform shall not exceed 400 MPN/100 mL

Objective/Criterion Reference:

California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for MacKerricher State Park (near Mill Creek) was collected at 1 monitoring site [ Mackerricher]

Temporal Representation:

Data was collected over the time period 4/2/2007-8/24/2010.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The samples were collected for the Beach Watch program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 78385, Indicator Bacteria	Region 1
MacKerricher State Park (near Mill Creek)

LOE ID:

25320

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

None of the 74 single samples of enterococcus collected at MacKerricher State Park exceed the objective. Additionally, none of the 24 30-day geomean values exceed the objective. The single sample and geomean values are two different matrices used Mendocino County Division of Environmental Health in accordance with AB411 (Chapter 765, Statutes of 1997) requirements. Data is maintained by the State Water Board's Beach Watch program. Data is summarized by the North Coast Regional Water Board (North Coast RWQCB 2007).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Per the Ocean Plan (SWRCB 2005): The following bacterial objectives shall be maintained throughout the water column. The following standard is based on the 30-day geometric mean of the 5 most recent samples from each site: Enterococcus density shall not exceed 35 MPN per 100ml. The following standard is for the single sample maximum: Enterococcus density shall not exceed 104 per 100 ml. *Note: MPN is the most probable number of coliform units.

Objective/Criterion Reference:

Water Quality Control Plan Ocean Waters of California. California Ocean Plan 2005. Sacramento, CA: State Water Resources Control Board, California Environmental Protection Agency

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at MacKerricher State Park .

Temporal Representation:

Samples were collected weekly from July to October 2005 and April to October 2006.

Environmental Conditions:

Samples were collected during the dry season. Otherwise, there are no known environmental conditions (e.g., land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

QAPP Information Reference(s):

Draft Guidance for Salt Water Beaches. Last Update: April 10, 2006. Initial Draft: November 1997. Division of Drinking Water and Environmental Management, California Department of Health Services

Line of Evidence (LOE) for Decision ID 78385, Indicator Bacteria	Region 1
MacKerricher State Park (near Mill Creek)

LOE ID:

133666

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Shellfish Harvesting

Number of Samples:

162

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Beachwatch_Mendocino County data for MacKerricher State Park (near Mill Creek) to determine beneficial use support and the results are as follows: 33 of the 162 samples exceeded the water quality standard for Coliform, Total. The water quality standard for shellfish is based on the median concentration of Total Coliform at each station, and is calculated on a monthly basis.

Data Reference:

Mendocino County Beachwatch data reformatted and renamed to match CEDEN fields.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2018) states that the median concentration of total coliform samples shall not exceed 70 per 100 ml.

Objective/Criterion Reference:

California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): MacKerricher

Temporal Representation:

The samples were collected between the days of 2003-01-15 and 2011-04-05 .

Environmental Conditions:

QAPP Information:

Data exempt from QAPP requirement. Draft QAPP for Mendocino County Beachwatch data used instead. Represents data collection procedure prior to development of a formal QAPP.

QAPP Information Reference(s):

Draft QAPP for Mendocino County Beachwatch. Represents data collection procedure prior to development of a formal QAPP.

Line of Evidence (LOE) for Decision ID 78385, Indicator Bacteria	Region 1
MacKerricher State Park (near Mill Creek)

LOE ID:

133669

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

112

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Beachwatch_Mendocino County data for MacKerricher State Park (near Mill Creek) to determine beneficial use support and the results are as follows: 2 of the 112 samples exceeded the geomean water quality standard for Enterococcus. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Mendocino County Beachwatch data reformatted and renamed to match CEDEN fields.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bacteria water quality objective to protect the REC-1 beneficial for all ocean waters , is a six-week rolling GM of Enterococci not to exceed 30 cfu/100mL (calculated weekly).

Objective/Criterion Reference:

California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): MacKerricher

Temporal Representation:

The samples were collected between the days of 2003-01-15 and 2011-04-05 .

Environmental Conditions:

QAPP Information:

Data exempt from QAPP requirement. Draft QAPP for Mendocino County Beachwatch data used instead. Represents data collection procedure prior to development of a formal QAPP.

QAPP Information Reference(s):

Draft QAPP for Mendocino County Beachwatch. Represents data collection procedure prior to development of a formal QAPP.

Line of Evidence (LOE) for Decision ID 78385, Indicator Bacteria	Region 1
MacKerricher State Park (near Mill Creek)

LOE ID:

44735

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

104

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

2 of 104 samples exceed the criterion for Enterococci.

Data Reference:

Data for Region 1 Beach Watch.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2009) states that the single sample maximum for Enterococcus shall not exceed 104 MPN/100 mL.

Objective/Criterion Reference:

California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for MacKerricher State Park (near Mill Creek) was collected at 1 monitoring site [ Mackerricher]

Temporal Representation:

Data was collected over the time period 4/2/2007-8/24/2010.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The samples were collected for the Beach Watch program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 78385, Indicator Bacteria	Region 1
MacKerricher State Park (near Mill Creek)

LOE ID:

32753

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Zero of the 88 geomeans exceeded the objective.

Data Reference:

Data for Region 1 Beach Watch.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The geometric mean standard for entercoccus states that the entercoccus density shall not exceed 35 per 100 mL. Water Quality Control Plan for Ocean Waters 2009.

Objective/Criterion Reference:

California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at MacKerricher State Park near Mill Creek.

Temporal Representation:

Samples were collected approximately once a week from April to October 2007 to 2010.

Environmental Conditions:

QAPP Information:

The samples were collected for the Beach Watch program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 78385, Indicator Bacteria	Region 1
MacKerricher State Park (near Mill Creek)

LOE ID:

133691

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

108

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Beachwatch_Mendocino County data for MacKerricher State Park (near Mill Creek) to determine beneficial use support and the results are as follows: 1 of the 108 samples exceeded the geomean water quality standard for Enterococcus. This is a six week rolling geomean that is calculated weekly. This data is for an AB411 beach. This LOE specifically corresponds with dry weather samples and only includes samples collected between April 1 and October 31 of each year.

Data Reference:

Mendocino County Beachwatch data reformatted and renamed to match CEDEN fields.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bacteria water quality objective to protect the REC-1 beneficial for all ocean waters , is a six-week rolling GM of Enterococci not to exceed 30 cfu/100mL (calculated weekly).

Objective/Criterion Reference:

California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): MacKerricher

Temporal Representation:

The samples were collected between the days of 2003-04-02 and 2011-04-05 .

Environmental Conditions:

QAPP Information:

Data exempt from QAPP requirement. Draft QAPP for Mendocino County Beachwatch data used instead. Represents data collection procedure prior to development of a formal QAPP.

QAPP Information Reference(s):

Draft QAPP for Mendocino County Beachwatch. Represents data collection procedure prior to development of a formal QAPP.

Line of Evidence (LOE) for Decision ID 78385, Indicator Bacteria	Region 1
MacKerricher State Park (near Mill Creek)

LOE ID:

133696

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Beachwatch_Mendocino County data for MacKerricher State Park (near Mill Creek) to determine beneficial use support and the results are as follows: 3 of the 43 samples exceeded the Statistical Threshold Value (STV) water quality standard for Enterococcus. The STV is based on a 10% exceedance rate that is calculated monthly. This data is for an AB411 beach. This LOE specifically corresponds with dry weather samples and only includes samples collected between April 1 and October 31 of each year.

Data Reference:

Mendocino County Beachwatch data reformatted and renamed to match CEDEN fields.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bacteria water quality objective to protect the REC-1 beneficial for all ocean waters, is a Statistical Threshold Value (STV) of 110 cfu/100 mL not to be exceeded more than 10 percent of the time (calculated monthly).

Objective/Criterion Reference:

California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): MacKerricher

Temporal Representation:

The samples were collected between the days of 2003-04-02 and 2011-04-05 .

Environmental Conditions:

QAPP Information:

Data exempt from QAPP requirement. Draft QAPP for Mendocino County Beachwatch data used instead. Represents data collection procedure prior to development of a formal QAPP.

QAPP Information Reference(s):

Draft QAPP for Mendocino County Beachwatch. Represents data collection procedure prior to development of a formal QAPP.

Line of Evidence (LOE) for Decision ID 78385, Indicator Bacteria	Region 1
MacKerricher State Park (near Mill Creek)

LOE ID:

133639

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Data Reference:

Mendocino County Beachwatch data reformatted and renamed to match CEDEN fields.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): MacKerricher

Temporal Representation:

The samples were collected between the days of 2003-01-15 and 2011-04-05 .

Environmental Conditions:

QAPP Information:

Data exempt from QAPP requirement. Draft QAPP for Mendocino County Beachwatch data used instead. Represents data collection procedure prior to development of a formal QAPP.

QAPP Information Reference(s):

Draft QAPP for Mendocino County Beachwatch. Represents data collection procedure prior to development of a formal QAPP.