| Water Body Name: | Temescal Creek, Reach 6 (Elsinore Groundwater sub basin boundary to Lake Elsinore Outlet) |
| Water Body ID: | CAR8013500020081204163614 |
| Water Body Type: | River & Stream |
DECISION ID |
28667 |
Region 8 |
Temescal Creek, Reach 6 (Elsinore Groundwater sub basin boundary to Lake Elsinore Outlet) |
||
| Pollutant: | Indicator Bacteria |
| 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)(2010) |
| Revision Status | Original |
| Sources: | Source Unknown |
| Expected TMDL Completion Date: | 2021 |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | Region 8 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.
USEPA Final Approval Decision Details: The November 12, 2010 USEPA partial approval letter and the October 11, 2011 final approval letter both from Alexis Strauss, USEPA Region 9, to Tom Howard, SWRCB, concluded the following: USEPA added Temescal Creek, Reach 6 (Elsinore Groundwater sub basin boundary to Lake Elsinore Outlet) to the list of water quality limited segments requiring a TMDL for indicator bacteria. This water body is designated as a Water Contact Recreation (REC1) water body either explicitly or implicitly as tributaries to other designated segments (RWQCB Santa Ana Region, 2008, Table 3-1, pp.3-23 - 3-35). The Santa Ana Basin Plan has the following water quality objective for fecal coliform to protect REC1 beneficial use: Fecal coliform: log mean less than 200 organisms/100 mL based on five or more samples/30 day period, and not more than 10% of the samples exceed 400 organisms/100 mL for any 30-day period. (RWQCB Santa Ana Region, 2008, pp.4-9) Recent monitoring data collected in this water body measures Escherichia coli (E. coli) indicator bacteria. E. coli is one species within the broader category of fecal coliform bacteria and monitoring data for E. coli can be used to evaluate whether the fecal coliform objective is being met in the subject water body. In addition, USEPA has recommended that California use USEPA's Ambient Water Quality Criteria for Bacteria (1986) when there is no adopted E. coli standard. Specifically, USEPA recommends that for REC1 beneficial use the following criteria be used: Steady state geometric mean indicator density - 126 indicator densities/100ml Designated beach area (upper 75% confidence limit) - 235 indicator densities/100ml (EPA, 1986, Table 4, pp.15) USEPA compared the E. coli data for this water body to the Basin Plan's fecal coliform objective, as well as to USEPA's recommended E. coli criteria and the results were: 1. Twelve of the 77 samples taken exceeded the USEPA E. coli criteria (235 organisms/100ml). Ten of 26 samples taken from site 3 exceeded the recommended criteria. 2. Nine of the 77 samples taken exceeded the Basin Plan objective for fecal coliform (400 organisms/100ml). Nine of 26 samples taken from site 3 exceeded the objective. For this water body segment, sufficient exceedances of the fecal coliform objective and the USEPA recommended criteria exist to merit listings per the 10% exceedance threshold for conventional pollutants expressed in Table 3.2 of the State Listing Policy. For historical clarification, the Regional and State Water Board detailed decision recommendations made prior to USEPA's final decision are presented in their respective recommendation fields in this decision. Note: All lines of evidence (LOEs) previously made by the Regional Boards have been revised where necessary in accordance with USEPA's final decision. |
| Regional Board Decision Recommendation: | Region 8 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle. |
| State Board Staff Review of Regional Board Conclusion and Recommendation: | For historical clarification, the Regional and State Water Board detailed decision recommendations made prior to USEPA's final decision are presented in their respective recommendation fields in this decision.
Note: All lines of evidence (LOEs) previously made by the Regional Boards have been revised where necessary in accordance with USEPA's final decision. |
| State Board Decision Recommendation: | Region 8 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle. |
|
|||||
| LOE ID: | 26083 | ||||
| Pollutant: | Escherichia coli (E. coli) | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | None | ||||
| Beneficial Use: | Water Contact Recreation | ||||
| Number of Samples: | 26 | ||||
| Number of Exceedances: | 10 | ||||
| Data and Information Type: | PATHOGEN MONITORING | ||||
| Data Used to Assess Water Quality: | Of the 77 samples taken by Orange County Coast Keeper Coastal Watersheds Project, 12 exceeded USEPA's recommended single sample standard and 10/26 exceeded at site 3 on the Temescal River (tem3).
Of the 77 samples taken by Orange County Coast Keeper Coastal Watersheds Project, 9 exceeded the Basin Plan fecal coliform objective and 9/26 samples exceeded at site 3 on the Temescal River (tem3) |
||||
| Data Reference: | Orange County Coast Keeper Coastal Watersheds Project | ||||
| USEPA Partial Approval Disapproval Letter and enclosures for California's 2008-2010 303(d) List | |||||
| USEPA Final Decision Letter with enclosures and responsiveness summary regarding waters added to California's 2008-2010 303(d) List | |||||
| USEPA Region 9 data summary for addition of indicator bacteria to California 2010 303(d) list for some Santa Ana River - Region 8 water bodies | |||||
| SWAMP Data: | Non-SWAMP | ||||
| Water Quality Objective/Criterion: | USEPA Recommended Ambient Water Quality Criteria for Bacteria -1986: E. coli: log mean less than 126 organisms/100 mL based on five or more samples per 30-day period, and single sample shall not exceed 235 organisms/100mL.
Santa Ana Region Basin Plan objective for Fecal coliform: log mean less than 200 organisms/100 mL based on five or more samples/30 day period, and not more than 10% of the samples exceed 400 organisms/100 mL for any 30-day period. (RWQCB Santa Ana Region, 2008, pp.4-9) |
||||
| Objective/Criterion Reference: | Water Quality Control Plan for the Santa Ana River Basin | ||||
| Ambient Water Quality Criteria for Bacteria - 1986. EPA440/5-84-002 | |||||
| Evaluation Guideline: | |||||
| Guideline Reference: | |||||
| Spatial Representation: | The samples were collected at three sites Temescal River 1, 2, and 3 (tem1, tem2, tem3). | ||||
| Temporal Representation: | The samples were collected weekly as follows: 29-Oct-02
9-Dec-02, 22-Dec-02, 4-Jan-03, 23-Jan-03, 20-Feb-03, 10-Mar-03, 24-Mar-03, 15-Apr-03, 21-May-03, 19-Jun-03, 17-Jul-03, 13-Aug-03, 17-Sep-03, 8-Oct-03, 18-Nov-03, 9-Dec-03, 23-Dec-03, 29-Jan-04, 4-Mar-04, 11-Apr-04, 6-May-04, 3-Jun-04. |
||||
| Environmental Conditions: | Staff is not aware of any special conditions that might effect interpretation of the data. | ||||
| QAPP Information: | The data's quality is deemed appropriate because it was obtained under the auspices of a QAPP approved by the Regional Board. | ||||
| QAPP Information Reference(s): | |||||