Final California 2020 Integrated Report (303(d) List/305(b) Report)

Supporting Information

Regional Board 1 - North Coast Region

Water Body Name:	Russian River HU, Middle Russian River HA, Mark West HSA, tributaries to Mark West Creek (except Windsor Creek and its tributaries)
Water Body ID:	CAR1142302020130919051933
Water Body Type:	River & Stream


DECISION ID	105218	Region 1
Russian River HU, Middle Russian River HA, Mark West HSA, tributaries to Mark West Creek (except Windsor Creek and its tributaries)

Pollutant:	Indicator Bacteria
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:	New bacteria water quality objectives for inland surface waters, enclosed bays, and estuaries in California took effect on February 4, 2019. Therefore, the Porter Creek-Mark West Creek HUC-12 is being considered for placement on the CWA section 303(d) List under section 3.3 of the Listing Policy utilizing the new objectives. Under this section a single line of evidence is necessary to assess listing status. Six lines of evidence are available in the administrative record to assess this pollutant. The waterbody-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are being exceeded.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the Porter Creek-Mark West Creek HUC-12 should be placed on the section 303(d) list for Indicator Bacteria 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 reviewing public comments on the draft 2018 303(d) list for the North Coast Region and after distributing written responses and the proposed final staff report, Water Board staff identified concerns with the proposed 2018 listing decisions pertaining to bacteria in waterbodies in the Russian River watershed. Therefore, bacteria listing decisions in the Russian River watershed remain substantially unchanged from the 2014-2016 California Integrated Report to afford adequate time for staff and stakeholders to review proposed changes in a future listing cycle. As decisions for this waterbody-pollutant combination were created for the 2018 Integrated Report and were not part of the 2014-2016 303(d) list, this decision was modified to conclude that the waterbody-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if water quality standards are being exceeded.

Line of Evidence (LOE) for Decision ID 105218, Indicator Bacteria	Region 1
Russian River HU, Middle Russian River HA, Mark West HSA, tributaries to Mark West Creek (except Windsor Creek and its tributaries)

LOE ID:

133777

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Statistical Threshold Value

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

9 of 11 statistical threshold values (STVs) from year-round data (November-October), 5 of 6 STVs calculated from Winter/Wet data (November-March), and 4 of 5 STVs calculated from Summer/Dry data (April-October) in Porter Creek-Mark West Creek HUC-12 exceed the criterion for Enterococci.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation utilized in the RWQCB1 Russian River TMDL .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The national criteria for enterococci are set as a geometric mean (30 cfu/100 mL) or the statistical threshold value (110 cfu/100 mL) to ensure no more than 32 illnesses per 1000 recreators, as defined by U.S. EPA (2012).

Objective/Criterion Reference:

2012 USEPA Recreational Water Quality Criteria - Bacteria

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Mark West Creek at Trenton-Healdsburg Road (114MW0930), Unnamed Tributary at River Road (114UR3927), and Van Buren Creek at St. Helena Road (114VB0410) in the Porter Creek-Mark West Creek HUC-12.

Temporal Representation:

Samples were collected from 12/9/2011 to 8/20/2012.

Environmental Conditions:

QAPP Information:

Data were collected in accordance with the Russian River Pathogen Indicator Bacteria TMDL QAPP (Version 1.0), Russian River Pathogen Indicator Bacteria TMDL - Supplemental Sampling Plan QAPP (Version 1.0), and/or the Russian River Pathogen Project QAPP.

QAPP Information Reference(s):

Russian River Pathogen Indicator Bacteria TMDL Quality Assurance Project Plan.

QAPP Information Reference(s):

Quality Assurance Project Plan - Russian River Pathogen Project.

QAPP Information Reference(s):

Russian River Pathogen Indicator Bacteria TMDL - Supplemental Sampling Plan Quality Assurance Project Plan.

Line of Evidence (LOE) for Decision ID 105218, Indicator Bacteria	Region 1
Russian River HU, Middle Russian River HA, Mark West HSA, tributaries to Mark West Creek (except Windsor Creek and its tributaries)

LOE ID:

133802

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

GeoMean

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

6 of 6 geometric means calculated from year-round data (November-October), 0 of 0 geometric means calculated from Winter/Wet data (November-March), and 6 of 6 geometric means calculated from Summer/Dry data (April-October) in Porter Creek-Mark West Creek HUC-12 exceed the criterion for Enterococci.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation utilized in the RWQCB1 Russian River TMDL .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

2012 USEPA Recreational Water Quality Criteria - Bacteria

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Samples were collected from 12/9/2011 to 8/20/2012.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Russian River Pathogen Indicator Bacteria TMDL Quality Assurance Project Plan.

QAPP Information Reference(s):

Quality Assurance Project Plan - Russian River Pathogen Project.

QAPP Information Reference(s):

Russian River Pathogen Indicator Bacteria TMDL - Supplemental Sampling Plan Quality Assurance Project Plan.

Line of Evidence (LOE) for Decision ID 105218, Indicator Bacteria	Region 1
Russian River HU, Middle Russian River HA, Mark West HSA, tributaries to Mark West Creek (except Windsor Creek and its tributaries)

LOE ID:

198720

Pollutant:

Indicator Bacteria

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:

HuBac concentrations >1000/100mL were found in both dry and wet weather samples in the Porter Creek-Mark West Creek HUC-12.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation utilized in the RWQCB1 Russian River TMDL .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

HuBac data are assessed to determine attainment of the beneficial use. Data are not assessed to determine attainment of an objective or criteria, and no objective or criteria is included here.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

HuBac (Bacteroides) are present in the human gut and do not survive long outside of the human gut. When present in the water column, measurable HuBac indicate the recent discharge of human fecal waste. There is no defined health-based threshold associated with HuBac results. The detection limit for HuBac is <60/100mL. HuBac concentrations >1000/100mL, which is two orders of magnitude greater than the detection limit, is reliable evidence of the presence of human fecal waste.

Guideline Reference:

Detection of the human specific Bacteroides genetic marker provides evidence of widespread sewage contamination of stormwater in the urban environment.

Spatial Representation:

Samples were collected at van Buren Creek (114VB0410) and Woolsey Creek (114UR3927) in the Porter Creek-Mark West Creek HUC-12.

Temporal Representation:

Dry weather samples were collected on 12/9/2011 and 3/5/2012. Wet weather samples were collected on 1/21/2012.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Russian River Pathogen Indicator Bacteria TMDL Quality Assurance Project Plan.

QAPP Information Reference(s):

Quality Assurance Project Plan - Russian River Pathogen Project.

QAPP Information Reference(s):

Russian River Pathogen Indicator Bacteria TMDL - Supplemental Sampling Plan Quality Assurance Project Plan.

Line of Evidence (LOE) for Decision ID 105218, Indicator Bacteria	Region 1
Russian River HU, Middle Russian River HA, Mark West HSA, tributaries to Mark West Creek (except Windsor Creek and its tributaries)

LOE ID:

133761

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

GeoMean

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

4 of 6 geometric means calculated from year-round data (November-October), 0 of 0 geometric means calculated from Winter/Wet data (November-March), and 4 of 6 geometric means calculated from Summer/Dry data (April-October) in Porter Creek-Mark West Creek HUC-12 exceed the objective for E. coli.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation utilized in the RWQCB1 Russian River TMDL .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California - Bacteria Provisions and a Water Quality Standards Variance Policy: The bacteria water quality objective for all waters where the salinity is equal to or less than 1 part per thousand (ppth) 95 percent or more of the time during the CALENDAR YEAR is: a six-week rolling GEOMETRIC MEAN of Escherichia coli (E. coli) not to exceed 100 colony forming units (cfu) per 100 milliliters (mL), calculated weekly.

Objective/Criterion Reference:

Amendment to the Water Quality Control Plan for Ocean Waters of California - Bacteria Provisions and a Water Quality Standards Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from Mark West Creek at Trenton-Healdsburg Road (114MW0930), Unnamed Tributary at River Road (114UR3927), and Van Buren Creek at St. Helena Road (114VB0410) in the Porter Creek-Mark West Creek HUC-12.

Temporal Representation:

Samples were collected from 12/9/2011 to 8/20/2012.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Russian River Pathogen Indicator Bacteria TMDL Quality Assurance Project Plan.

QAPP Information Reference(s):

Quality Assurance Project Plan - Russian River Pathogen Project.

QAPP Information Reference(s):

Russian River Pathogen Indicator Bacteria TMDL - Supplemental Sampling Plan Quality Assurance Project Plan.

Line of Evidence (LOE) for Decision ID 105218, Indicator Bacteria	Region 1
Russian River HU, Middle Russian River HA, Mark West HSA, tributaries to Mark West Creek (except Windsor Creek and its tributaries)

LOE ID:

198714

Pollutant:

Indicator Bacteria

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

In the Porter Creek-Mark West Creek HUC-12, 1 sample had >=10% of bacteria of human origin indicating moderate evidence of the presence of human fecal waste in the water column, and this represents an impact to the recreational beneficial use (REC-1).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation utilized in the RWQCB1 Russian River TMDL .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

PhyloChip DNA data are assessed to determine attainment of the beneficial use. Data are not assessed to determine attainment of an objective or criteria, and no objective or criteria is included here.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

PhyloChip DNA microarray quantifies over 59,000 bacterial taxa in a single sample by targeting variations in the 16S rRNA gene. There is no defined health-based threshold associated with PhyloChip results. There is moderate evidence of human fecal waste in the water column when 10% or greater of the taxa measured in an ambient water quality sample are associated with the human gut. When 20% or greater of the taxa measured are associated with the human gut, there is strong evidence of the presence of human fecal waste in the water column. Samples with greater than 10% of the taxa measured associated with the human gut is evidence of the presence of human fecal waste in the waterbody.

Guideline Reference:

Microbial source tracking in impaired watersheds using PhyloChip and machine-learning classification.

Guideline Reference:

Personal Communication between Alydda Mangelsdorf (NCRWQCB) and Eric Dubinsky (Lawrence Berkeley National Lab) about the Russian River Pathogen TMDL and PhyloChip Study.

Guideline Reference:

Russian River Human Impact Study PhyloChip Microbial Community Analysis.

Spatial Representation:

Samples were collected at van Buren Creek (114VB0410) and Woolsey Creek (114UR327) in the Porter Creek-Mark West Creek HUC-12.

Temporal Representation:

Samples were collected from 12/9/2011 to 3/5/2012.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Russian River Pathogen Indicator Bacteria TMDL Quality Assurance Project Plan.

QAPP Information Reference(s):

Quality Assurance Project Plan - Russian River Pathogen Project.

QAPP Information Reference(s):

Russian River Pathogen Indicator Bacteria TMDL - Supplemental Sampling Plan Quality Assurance Project Plan.

Line of Evidence (LOE) for Decision ID 105218, Indicator Bacteria	Region 1
Russian River HU, Middle Russian River HA, Mark West HSA, tributaries to Mark West Creek (except Windsor Creek and its tributaries)

LOE ID:

133731

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Statistical Threshold Value

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

2 of 11 statistical threshold values (STVs) from year-round data (November-October), 2 of 6 STVs calculated from Winter/Wet data (November-March), and 0 of 5 STVs calculated from Summer/Dry data (April-October) in Porter Creek-Mark West Creek HUC-12 exceed the objective for E. coli.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation utilized in the RWQCB1 Russian River TMDL .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California - Bacteria Provisions and a Water Quality Standards Variance Policy: The bacteria water quality objective for all waters where the salinity is equal to or less than 1 part per thousand (ppth) 95 percent or more of the time during the CALENDAR YEAR is: a STATISTICAL THRESHOLD VALUE (STV) of Escherichia coli of 320 cfu/100 mL not to be exceeded by more than 10 percent of the samples collected in a CALENDAR MONTH, calculated in a static manner.

Objective/Criterion Reference:

Amendment to the Water Quality Control Plan for Ocean Waters of California - Bacteria Provisions and a Water Quality Standards Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Samples were collected from 12/9/2011 to 8/20/2012.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Russian River Pathogen Indicator Bacteria TMDL Quality Assurance Project Plan.

QAPP Information Reference(s):

Quality Assurance Project Plan - Russian River Pathogen Project.

QAPP Information Reference(s):

Russian River Pathogen Indicator Bacteria TMDL - Supplemental Sampling Plan Quality Assurance Project Plan.


DECISION ID	78776	Region 1
Russian River HU, Middle Russian River HA, Mark West HSA, tributaries to Mark West Creek (except Windsor Creek and its tributaries)

Pollutant:	Temperature, water
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)(2016)
Revision Status	Original
Sources:	Flow Alteration/Regulation/Modification \| Removal of Riparian Vegetation
Expected TMDL Completion Date:	2023
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Regional Board Conclusion: This pollutant was considered for removal from the section 303(d) list in a previous assessment cycle. No new information was reviewed for this current assessment cycle. Therefore, the previous conclusion remains unchanged, and is as follows: The "Russian River HU, Middle Russian River HA, Mark West Creek HSA" water body has been split into four water bodies for the current Integrated Report cycle: (1) Russian River HU, Middle Russian River HA, Mark West HSA, mainstem Mark West Creek downstream of the confluence with the Laguna de Santa Rosa, (2) Russian River HU, Middle Russian River HA, Mark West HSA, mainstem Mark West Creek upstream of the confluence with the Laguna de Santa Rosa, (3) Russian River HU, Middle Russian River HA, Mark West HSA, tributaries to Mark West Creek (except Windsor Creek and its tributaries), and (4) Russian River HU, Middle Russian River HA, Mark West HSA, Windsor Creek and its tributaries. LOE 47197 is a copy of placeholder LOE 4770 from the 2006 Listing cycle. LOE 47426 is new for the current Integrated Report cycle. 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. 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 this water segment-pollutant combination from the section 303(d) list (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) 303(d) listing determinations made prior to 2006 were not held in an assessment database. LOE 47197 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:	This is a decision previously approved by the State Water Resources Control Board and the USEPA. No new data were assessed by the Regional Board for the current cycle. The decision has not changed.

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 78776, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Mark West HSA, tributaries to Mark West Creek (except Windsor Creek and its tributaries)

LOE ID:

47426

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:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 8 samples collected in Humbug Creek (a tributary to Mark West Creek) exceeded the evaluation guideline. Temperatures during February - April (when spawning, incubation and emergence occur) ranged from 8 degrees C to 13 degrees C. Temperatures during May - July (when migration and rearing occur) ranged from 12.8 degrees C to 16 degrees C.

Data Reference:

Data for Water Quality in Mark West Creek, 2004-2009.

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:

According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.

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:

Grab samples were collected from the HBG020 in Humbug Creek.

Temporal Representation:

Grab samples were collected monthly during February - May & July 2009, and three times (weekly) during June 2009.

Environmental Conditions:

QAPP Information:

There was no quality assurance information with this data.

QAPP Information Reference(s):

Quality Assurance Project Plan for Mark West Creek, Sonoma County.

Line of Evidence (LOE) for Decision ID 78776, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Mark West HSA, tributaries to Mark West Creek (except Windsor Creek and its tributaries)

LOE ID:

47197

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):


DECISION ID	79536	Region 1
Russian River HU, Middle Russian River HA, Mark West HSA, tributaries to Mark West Creek (except Windsor Creek and its tributaries)

Pollutant:	Sedimentation/Siltation
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Sources:	Flow Alteration/Regulation/Modification \| Removal of Riparian Vegetation \| Streambank Modification/Destabilization
Expected TMDL Completion Date:	2023
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Regional Board Conclusion: This pollutant was considered for placement on the section 303(d) list in a previous assessment cycle. No new information was reviewed for this current assessment cycle. Therefore, the previous conclusion remains unchanged, and is as follows: Data included in this decision were originally assessed under the "Russian River HU, Middle Russian River HA, Mark West Creek HSA" water body has been split into four water bodies for the current Integrated Report cycle: (1) Russian River HU, Middle Russian River HA, Mark West HSA, mainstem Mark West Creek downstream of the confluence with the Laguna de Santa Rosa, (2) Russian River HU, Middle Russian River HA, Mark West HSA, mainstem Mark West Creek upstream of the confluence with the Laguna de Santa Rosa, (3) Russian River HU, Middle Russian River HA, Mark West HSA, tributaries to Mark West Creek (except Windsor Creek and its tributaries), and (4) Russian River HU, Middle Russian River HA, Mark West HSA, Windsor Creek and its tributaries. LOE 47193 is a copy of placeholder LOE 4769 from the 2006 Listing cycle. There are no new data for this water segment-pollutant combination for the current Integrated Report cycle. 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: 303(d) listing decisions made prior to 2006 were not held in an assessment database. The Regional Boards will update this decision when new data and information become available and are assessed.

Regional Board Decision Recommendation:	This is a decision previously approved by the State Water Resources Control Board and the USEPA. No new data were assessed by the Regional Board for the current cycle. The decision has not changed.

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 79536, Sedimentation/Siltation	Region 1
Russian River HU, Middle Russian River HA, Mark West HSA, tributaries to Mark West Creek (except Windsor Creek and its tributaries)

LOE ID:

47193

Pollutant:

Sedimentation/Siltation

LOE Subgroup:

Pollutant-Sediment

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):