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

Field, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 4.

Line of Evidence (LOE) for Decision ID 136130, Toxicity	Region 4
Malibu Lagoon

LOE ID:

244379

Pollutant:

Toxicity

LOE Subgroup:

Toxicity

Matrix:

Water

Fraction:

None

Beneficial Use:

Estuarine Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

TOXICITY TESTING

Data Used to Assess Water Quality:

0 of the 3 samples collected by CA Dept of Transit NPDES Monitoring 2014-2015 for Malibu Lagoon exhibited toxicity. A sample may have multiple toxicity test results, but will only be counted once. A sample is defined as being collected on the same day and the same location. The following organisms and parameters were utilized for the toxicity tests: Pimephales promelas for Survival.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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 Los Angeles Region R4 Basin Plan

Evaluation Guideline:

The sample is toxic when the response of the organisms exposed to the sample is significantly different (worse) than the response of the organisms exposed to the laboratory control based on statistical hypothesis testing. An exceedance is counted when the significant effect code is “Significant; Less Similarity,” which means that the sample result is significantly different than the control result, and the percent effect is greater than the evaluation threshold. The default evaluation threshold is 20% unless otherwise stated.

Guideline Reference:

Short-term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Freshwater Organisms. Fourth Edition. Office of Water, U.S. Environmental Protection Agency. Washington, D.C. EPA-821-R-02-013

Spatial Representation:

The samples were collected at monitoring site: 7-426 ( Malibu Lagoon Characterization ).

Temporal Representation:

The samples were collected between the dates of 2019-01-05 and 2019-01-31.

Environmental Conditions:

QAPP Information:

STATE OF CALIFORNIA CALIFORNIA STATE TRANSPORTATION AGENCY DIVISION OF ENVIRONMENTAL ANALYSIS STORMWATER PROGRAM. 2020. Stormwater Monitoring Guidance Manual.

QAPP Information Reference(s):

Field, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 4.

Line of Evidence (LOE) for Decision ID 136130, Toxicity	Region 4
Malibu Lagoon

LOE ID:

244380

Pollutant:

Toxicity

LOE Subgroup:

Toxicity

Matrix:

Water

Fraction:

None

Beneficial Use:

Marine Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

TOXICITY TESTING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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 Los Angeles Region R4 Basin Plan

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at monitoring site: 7-426 ( Malibu Lagoon Characterization ).

Temporal Representation:

The samples were collected between the dates of 2019-01-05 and 2019-01-31.

Environmental Conditions:

QAPP Information:

STATE OF CALIFORNIA CALIFORNIA STATE TRANSPORTATION AGENCY DIVISION OF ENVIRONMENTAL ANALYSIS STORMWATER PROGRAM. 2020. Stormwater Monitoring Guidance Manual.

QAPP Information Reference(s):

Field, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 4.

Line of Evidence (LOE) for Decision ID 136130, Toxicity	Region 4
Malibu Lagoon

LOE ID:

244394

Pollutant:

Toxicity

LOE Subgroup:

Toxicity

Matrix:

Water

Fraction:

TST

Beneficial Use:

Marine Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

TOXICITY TESTING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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 Los Angeles Region R4 Basin Plan

Evaluation Guideline:

Guideline Reference:

Toxicity Provisions to the Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California.

Spatial Representation:

The samples were collected at monitoring site: 7-426 ( Malibu Lagoon Characterization ).

Temporal Representation:

The samples were collected between the dates of 2019-01-05 and 2019-01-31.

Environmental Conditions:

QAPP Information:

STATE OF CALIFORNIA CALIFORNIA STATE TRANSPORTATION AGENCY DIVISION OF ENVIRONMENTAL ANALYSIS STORMWATER PROGRAM. 2020. Stormwater Monitoring Guidance Manual.

QAPP Information Reference(s):

Southern California Bight 2003 Regional Marine Monitoring Survey Data


DECISION ID	136131	Region 4
Malibu Lagoon

Pollutant:	Zinc
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:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

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. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB 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.

Line of Evidence (LOE) for Decision ID 136131, Zinc	Region 4
Malibu Lagoon

LOE ID:

243674

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Estuarine Habitat

Aquatic Life Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Chemical monitoring of sediments

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

The Sediment Quality Guideline (SQG) for Effects-Range Median (Long et al., 1995) is 410 ug/g for zinc (dry weight).

Guideline Reference:

Incidence of adverse biological effects within ranges of chemical concentrations in marine and estuary sediments. Environmental Management. 19, (1): 81-97

Spatial Representation:

Three monitoring stations at Malibu Lagoon:
4683 (Lat 34.03279, Long -118.68481),
4939 (Lat 34.032583, Long -118.681383), and
5739 (Lat 34.03435, Long -118.68198).

Temporal Representation:

The sediment samples were taken on 8/20/2003 and 10/2/2003 as part of the Bight 03 Monitoring Project.

Environmental Conditions:

QAPP Information:

The work was performed in accordance with the provisions of the Southern California Bight 2003 Regional Marine Monitoring Survey (Bight¿03) Quality Assurance Manual.

QAPP Information Reference(s):

Southern California Bight 2003 Regional Marine Monitoring Survey (Bight 03) Quality Assurance Manual


DECISION ID	68414	Region 4
Malibu Lagoon

Pollutant:	pH
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:	A Source Unknown
Expected TMDL Completion Date:	2006
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 section 4.2 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. This line of evidence was probably used to place the water body pollutant combination on the 2002 303(d) list originally. Thirty-three samples exceeded the water quality objective when the water body was listed. However, twenty-two exceedances or less would be required in order to delist the water body pollutant combination to provide the adequate confidence and power that standards are being met in accordance with the Listing Policy. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification in favor of 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.Thirty-three of 138 samples exceeded the pH water quality objective and this exceeds the allowable limit in Table 4.2 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:	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 68414, pH	Region 4
Malibu Lagoon

LOE ID:

517

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Estuarine Habitat

Number of Samples:

138

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

There were 138 water samples, with 33 samples exceeding the water quality objective (SWRCB, 2003).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Basin Plan: The pH of bays and estuaries shall not be depressed below 6.5 or raised above 8.5 as a result of waste discharges. Ambient pH levels shall not be changed more than 0.2 units from natural conditions as a result of waste discharge.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

pH data was collected a various monitoring stations within the lagoon.

Temporal Representation:

Winter 1997, Summer-Winter 1998, Winter- Fall 1999.

Environmental Conditions:

QAPP Information:

Las Virgenas NPDES Municipal Water District.

QAPP Information Reference(s):


DECISION ID	99794	Region 4
Malibu Lagoon

Pollutant:	Benthic Community Effects
Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)(2016)
Revision Status	Original
Sources:	A Source Unknown
TMDL Name:	Malibu Lagoon Benthic Comm. Effects (71)
TMDL Project Code:	409
Date TMDL Approved by USEPA:	07/02/2013
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the CWA section 303(d) List under section 4.9 of the Listing Policy. 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 CWA section 303(d) List. There is sufficient justification to place it in the Being Addressed portion of the CWA 303(d) List because a TMDL has been completed and approved by RWQCB and USEPA, and is expected to result in attainment of the standard. 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 Malibu Lagoon Restoration Feasibility Study Final Alternatives Analysis describes restoration measure for Malibu Lagoon. These proposed restoration efforts, if fully implemented, is anticipated to correct the conditions which allow the negative indicator species to thrive. 4. The Malibu Creek and Lagoon TMDL for Sedimentation and Nutrients to Address Benthic Community Impairments was approved by USEPA on 07/02/2013. 5. 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 the available data and information for this recommendation, SWRCB staff conclude that the water body and pollutant combination should be placed in the Water Quality Limited Segments Being Addressed portion of the section 303(d) list because a TMDL has been approved by USEPA and an implementation plan has been approved.

Line of Evidence (LOE) for Decision ID 99794, Benthic Community Effects	Region 4
Malibu Lagoon

LOE ID:

4329

Pollutant:

Benthic Community Effects

LOE Subgroup:

Population/Community Degradation

Matrix:

Sediment

Fraction:

Not Recorded

Beneficial Use:

Estuarine Habitat

Number of Samples:

Number of Exceedances:

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:

Lower Malibu Creek and Lagoon Resource Enhancement and Management Final Report to the California State Coastal Conservancy. Ambrose, Richard F. and Antony, R. Orme. University of California, Los Angeles. May 2000. Chapter 3.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Unspecified

Temporal Representation:

Unspecified

Environmental Conditions:

Unspecified

QAPP Information:

Unspecified

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 99794, Benthic Community Effects	Region 4
Malibu Lagoon

LOE ID:

26966

Pollutant:

Benthic Community Effects

LOE Subgroup:

Narrative Description Data

Matrix:

-N/A

Fraction:

None

Beneficial Use:

Estuarine Habitat

Aquatic Life Use:

Cold Freshwater Habitat | Marine Habitat | Preservation of Rare & Endangered Species | Warm Freshwater Habitat | Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

QUALITATIVE (EVALUATED) ASSESSMENT - UNSPECIFIED

Data Used to Assess Water Quality:

The Malibu Lagoon Restoration Feasibility Study lists structural and non-structural BMPs for the restoration of Malibu Lagoon. These measures are expected to improve sediment delivery and increase scour to some areas, increasing grain size, and allowing more oxygen rich water to bed sediment.

Data Reference:

Malibu Lagoon Restoration Feasibility Study Final Alternatives Analysis. 2005. Prepared by: Moffatt & Nichol In Association With Heal the Bay. Prepared for California State Coastal Conservancy & California State Parks. March 2005.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

None

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 99794, Benthic Community Effects	Region 4
Malibu Lagoon

LOE ID:

517

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Estuarine Habitat

Number of Samples:

138

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

There were 138 water samples, with 33 samples exceeding the water quality objective (SWRCB, 2003).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Staff report, appendix, and letter to SWRCB and Los Angeles RWQCB establishing a TMDL for Nutrients in the Malibu Creek Watershed.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

pH data was collected a various monitoring stations within the lagoon.

Temporal Representation:

Winter 1997, Summer-Winter 1998, Winter- Fall 1999.

Environmental Conditions:

QAPP Information:

Las Virgenas NPDES Municipal Water District.

QAPP Information Reference(s):


DECISION ID	69987	Region 4
Malibu Lagoon

Pollutant:	Eutrophic
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)(2016)
Revision Status	Original
Sources:	Agriculture-animal \| Atmospheric Deposition \| Golf course activities \| Groundwater Loadings \| Irrigated Crop Production \| Major Municipal Point Source-dry and/or wet weather discharge \| Onsite Wastewater Systems (Septic Tanks) \| Urban Runoff/Storm Sewers
TMDL Name:	Malibu Creek Nutrients (50)
TMDL Project Code:	239
Date TMDL Approved by USEPA:	03/21/2003
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal on the section 303(d) list under sections 2.2 of the Listing Policy. Under 2.2 of the Policy, a minimum of one line of evidence is needed 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. There is sufficient justification to place it in the Being Addressed portion of the 303(d) list because a TMDL has been established by USEPA, and is expected to result in attainment of the standard.

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 69987, Eutrophic	Region 4
Malibu Lagoon

LOE ID:

28459

Pollutant:

Eutrophic

LOE Subgroup:

Narrative Description Data

Matrix:

Not Specified

Fraction:

None

Beneficial Use:

Estuarine Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

A TMDL has been established for this water segment-pollutant combination. The Malibu Creek Watershed Nutrient TMDL was established by USEPA on March 21, 2003.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

QA information unavailable.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 69987, Eutrophic	Region 4
Malibu Lagoon

LOE ID:

4330

Pollutant:

Eutrophic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Estuarine Habitat

Number of Samples:

Number of Exceedances:

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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Unspecified

Objective/Criterion Reference:

Evaluation Guideline:

Unspecified

Guideline Reference:

Spatial Representation:

Unspecified

Temporal Representation:

Unspecified

Environmental Conditions:

Unspecified

QAPP Information:

Unspecified

QAPP Information Reference(s):


DECISION ID	69576	Region 4
Malibu Lagoon

Pollutant:	Indicator Bacteria
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)(2016)
Revision Status	Original
Sources:	Nonpoint Source \| Point Source
TMDL Name:	Malibu Pathogens (47 in part)
TMDL Project Code:	236
Date TMDL Approved by USEPA:	01/01/2006
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	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. One line of evidence is available in the administrative record to assess this pollutant. A TMDL has been developed and approved by USEPA and an approved implementation plan is expected to result in attainment of the standard. The Malibu Creek Watershed Bacteria TMDL was approved by USEPA in January of 2006. 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:	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 69576, Indicator Bacteria	Region 4
Malibu Lagoon

LOE ID:

518

Pollutant:

Coliform Bacteria

LOE Subgroup:

Pollutant-Water

Matrix:

Not Specified

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:

Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

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):


DECISION ID	76137	Region 4
Malibu Lagoon

Pollutant:	Swimming Restrictions
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)(2016)
Revision Status	Original
Sources:	Agriculture-animal \| Illicit Connections/Illegal Hook-ups/Dry Weather Flows \| Natural Sources \| Onsite Wastewater Systems (Septic Tanks) \| Spills \| Surface Runoff \| Urban Runoff/Storm Sewers
TMDL Name:	Malibu Pathogens (47 in part)
TMDL Project Code:	236
Date TMDL Approved by USEPA:	01/10/2006
Impairment from Pollutant or Pollution:	Pollution

Regional Board Conclusion:	This pollutant is being considered for removal on the section 303(d) list under sections 2.2 of the Listing Policy. Under 2.2 of the Policy, a minimum of one line of evidence is needed 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. There is sufficient justification to place it in the Being Addressed portion of the 303(d) list because a TMDL has been completed and adopted by the Los Angeles RWQCB and approved by USEPA, and is expected to result in attainment of the standard.

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 76137, Swimming Restrictions	Region 4
Malibu Lagoon

LOE ID:

28091

Pollutant:

Swimming Restrictions

LOE Subgroup:

Narrative Description Data

Matrix:

Not Specified

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:

A TMDL has been approved for this water segment-pollutant combination. The Malibu Creek Bacteria TMDL was adopted by the Los Angeles RWQCB on December 13, 2004 and subsequently approved by USEPA. The TMDL was been integrated into the Basin Plan as Attachment A of Regional Board Resolution No. 2004-019R.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

QA information unavailable.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 76137, Swimming Restrictions	Region 4
Malibu Lagoon

LOE ID:

4332

Pollutant:

Swimming Restrictions

LOE Subgroup:

Health Advisories

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Unspecified

Temporal Representation:

Unspecified

Environmental Conditions:

Unspecified

QAPP Information:

Unspecified

QAPP Information Reference(s):


DECISION ID	76135	Region 4
Malibu Lagoon

Pollutant:	Viruses (enteric)
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)(2016)
Revision Status	Original
Sources:	Agriculture-animal \| Illicit Connections/Illegal Hook-ups/Dry Weather Flows \| Natural Sources \| Onsite Wastewater Systems (Septic Tanks) \| Spills \| Surface Runoff \| Urban Runoff/Storm Sewers
TMDL Name:	Malibu Pathogens (47 in part)
TMDL Project Code:	236
Date TMDL Approved by USEPA:	01/10/2006
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal on the section 303(d) list under sections 2.2 of the Listing Policy. Under 2.2 of the Policy, a minimum of one line of evidence is needed 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. There is sufficient justification to place it in the Being Addressed portion of the 303(d) list because a TMDL has been completed and adopted by the Los Angeles RWQCB and approved by USEPA, and is expected to result in attainment of the standard.

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 76135, Viruses (enteric)	Region 4
Malibu Lagoon

LOE ID:

4333

Pollutant:

Viruses (enteric)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Unspecified

Objective/Criterion Reference:

Evaluation Guideline:

Unspecified

Guideline Reference: