| Water Body Name: | Tuna Canyon Creek |
| Water Body ID: | CAR4041200020050607194935 |
| Water Body Type: | River & Stream |
DECISION ID |
16393 |
Region 4 |
Tuna Canyon Creek |
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| Pollutant: | Nitrate |
| 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. Zero of the samples exceed the water quality objective. 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 five samples exceeded the Basin Plan water quality objective for nitrate 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 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. |
| USEPA Action (if applicable): | |
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| LOE ID: | 28220 | ||||
| Pollutant: | Nitrate | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | None | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Aquatic Life Use: | Wildlife Habitat | ||||
| Number of Samples: | 5 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) | ||||
| Data Used to Assess Water Quality: | Zero of five samples exceeded the Basin Plan water quality objective for nitrate in Tuna Canyon Creek. Water quality samples were taken and analyzed for nitrate in accordance with the Surface Water Ambient Monitoring Program monitoring and testing parameters. | ||||
| Data Reference: | Surface Water Ambient Monitoring Program data for all watersheds in the Los Angeles Region 2001-2005. | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | The Basin Plan lists a water quality objective of 10 mg/L for nitrate as nitrate-nitrogen (NO3-N). | ||||
| Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
| Evaluation Guideline: | |||||
| Guideline Reference: | |||||
| Spatial Representation: | Sampling were collected at monitoring station 404SMB040, located in Upper Tuna Canyon (Lat: 34.04678, Long: -118.59061) and at monitoring station 404SMB041, located in Lower Tuna Canyon Creek (Lat: 34.04028, Long: -118.58904). | ||||
| Temporal Representation: | Grab samples were taken on March 10, 2003 and March 27, 2003 for sample station 404SMB040 and 404SMB041, and on February 25, 2004 for sample station 404SMB040. | ||||
| Environmental Conditions: | |||||
| QAPP Information: | Data was collected in compliance with the sampling and monitoring procedures detailed in Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. | ||||
| 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 |
6825 |
Region 4 |
Tuna Canyon Creek |
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| 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)(2006) |
| Revision Status | Original |
| 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.
One line of evidence is available in the administrative record to assess this pollutant. An insufficient total number of samples were taken and an insufficient number of samples exceed the MCL guideline for Sulfate. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification in favor of 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. Four of four samples exceeded the MCL guideline. More data is needed to determine if the water quality standard is exceeded. 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: | 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. |
| USEPA Action (if applicable): | |
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| LOE ID: | 2241 | ||||
| Pollutant: | Sulfates | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | Not Recorded | ||||
| Beneficial Use: | Municipal & Domestic Supply | ||||
| Number of Samples: | 4 | ||||
| Number of Exceedances: | 4 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | There was a total of four samples with all four exceeding the objective (SWAMP, 2004). | ||||
| Data Reference: | Placeholder reference 2006 303(d) | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | CCR- Title 22 Table 64449-B Secondary Maximum Contaminant Levels of 250 mg/l for Sulfate. | ||||
| Objective/Criterion Reference: | Placeholder reference 2006 303(d) | ||||
| Evaluation Guideline: | |||||
| Guideline Reference: | |||||
| Spatial Representation: | Two stations at Tuna Canyon Creek Lower: 34.0396 -118.58955 and at Tuna Canyon Creek Upper: 34.04686 -118.59066. | ||||
| Temporal Representation: | Samples were collected March 2003 through March 2004. | ||||
| Environmental Conditions: | Los Angeles County Coastal Streams: 404.12. | ||||
| QAPP Information: | SWAMP Quality Assurance Plan. | ||||
| QAPP Information Reference(s): | |||||