| Water Body Name: | Bolsa Bay Marsh |
| Water Body ID: | CAE8011100019991012164616 |
| Water Body Type: | Estuary |
DECISION ID |
94571 |
Region 8 |
Bolsa Bay Marsh |
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| Pollutant: | Toxicity |
| 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: | A Source Unknown |
| Expected TMDL Completion Date: | 2027 |
| 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 3.6 of the Listing Policy. Under section 3.6 at least one line of evidence is necessary to assess listing status for toxicity, and waters may be placed on the CWA section 303(d) List for toxicity alone.
Two lines of evidence are available in the administrative record to assess this pollutant. Two of the seven samples exhibited sediment toxicity. Five of the twelve samples exhibited water toxicity. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA 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. Two of the seven samples exhibited sediment toxicity and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. Five of the twelve samples exhibited water toxicity and this exceeds 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 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. |
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| LOE ID: | 81263 | ||||
| Pollutant: | Toxicity | ||||
| LOE Subgroup: | Toxicity | ||||
| Matrix: | Water | ||||
| Fraction: | None | ||||
| Beneficial Use: | Marine Habitat | ||||
| Number of Samples: | 12 | ||||
| Number of Exceedances: | 5 | ||||
| Data and Information Type: | TOXICITY TESTING | ||||
| Data Used to Assess Water Quality: | Twelve samples were collected to evaluate water toxicity. Five of the twelve samples exhibited significant toxicity. The toxicity tests that exhibited significant toxicity included Mysid biomass and survival and Purple Urchin fertilized. | ||||
| Data Reference: | Data for Various Waterbodies in Region 8 and Region 9, 2006-2009. | ||||
| SWAMP Data: | Non-SWAMP | ||||
| Water Quality Objective/Criterion: | Toxic substances shall not be discharged at levels that will bioaccumulate in aquatic resources to levels which are harmful to human health. The concentrations of toxic substances in the water column, sediments or biota shall not adversely affect beneficial uses. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan, Santa Ana River Basin | ||||
| Evaluation Guideline: | Toxicity is defined as a statistically significant effect in the sample exposure compared to the control using EPA-recommended hypothesis testing. The t-test is used to determine if there is a statistically significant decrease in organism response in the sample as compared to the control. Exceedances are counted with the significant effect code SL. SL is defined as the result being significant compared to the negative control based on a statistical test, less than stated the alpha level, AND less than the evaluation threshold. | ||||
| Guideline Reference: | Short-term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to West Coast Marine and Estuarine Organisms. EPA/600/R-95-136. | ||||
| Spatial Representation: | The samples were collected at station TGDC05 Bolsa Bay. | ||||
| Temporal Representation: | The samples were collected from 2006 to 2009. | ||||
| Environmental Conditions: | |||||
| QAPP Information: | The data collected under the Quality Assurance Management Plan for The Orange County Stormwater Program. The SWAMP measurement quality objectives were followed for toxicity data. The performance of toxicity bioassays and evaluation of reference toxicants were performed using USEPA and Standard Methods. | ||||
| QAPP Information Reference(s): | |||||
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| LOE ID: | 81264 | ||||
| Pollutant: | Toxicity | ||||
| LOE Subgroup: | Toxicity | ||||
| Matrix: | Sediment | ||||
| Fraction: | None | ||||
| Beneficial Use: | Marine Habitat | ||||
| Number of Samples: | 7 | ||||
| Number of Exceedances: | 2 | ||||
| Data and Information Type: | TOXICITY TESTING | ||||
| Data Used to Assess Water Quality: | Seven samples were collected to evaluate sediment toxicity. Two of the seven samples exhibited significant toxicity. The toxicity tests included survival of Eohaustorius. | ||||
| Data Reference: | Data for Various Waterbodies in Region 8 and Region 9, 2006-2009. | ||||
| SWAMP Data: | Non-SWAMP | ||||
| Water Quality Objective/Criterion: | Toxic substances shall not be discharged at levels that will bioaccumulate in aquatic resources to levels which are harmful to human health. The concentrations of toxic substances in the water column, sediments or biota shall not adversely affect beneficial uses. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan, Santa Ana River Basin | ||||
| Evaluation Guideline: | Toxicity is defined as a statistically significant effect in the sample exposure compared to the control using EPA-recommended hypothesis testing. The t-test is used to determine if there is a statistically significant decrease in organism response in the sample as compared to the control. Exceedances are counted with the significant effect code SL. SL is defined as the result being significant compared to the negative control based on a statistical test, less than stated the alpha level, AND less than the evaluation threshold. | ||||
| Guideline Reference: | Methods for Assessing the Toxicity of Sediment-associated Contaminants with Estuarine and Marine Amphipods. June 1994. EPA 600/R-94/025 | ||||
| Spatial Representation: | The samples were collected at station TGDC05 Bolsa Bay. | ||||
| Temporal Representation: | The samples were collected approximately twice a year from 2006 to 2009. | ||||
| Environmental Conditions: | |||||
| QAPP Information: | The data collected under the Quality Assurance Management Plan for The Orange County Stormwater Program. The SWAMP measurement quality objectives were followed for toxicity data. The performance of toxicity bioassays and evaluation of reference toxicants were performed using USEPA and Standard Methods. | ||||
| QAPP Information Reference(s): | |||||