Cal. Code Regs. tit. 23 § 3939.4
On August 7, 2003, the Los Angeles Regional Water Quality Control Board (Regional Board), adopted Resolution No. 2003-012 amending the Water Quality Control Plan for the Los Angeles Region (Basin Plan). The amendment revised the Basin Plan by incorporating a total maximum daily load for bacteria at Marina del Rey Mothers' Beach and back basins. The regulatory provisions are added to Chapter 7 of the Water Quality Control Plan.
Numeric targets for the TMDL are expressed as days of exceedance of bacteria objectives. The implementation plan for this TMDL stipulates that: No days of exceedance are permitted at any monitoring location during the summer dry-weather season (April 1 to October 31) and the geometric mean limits must be met at all times; a maximum of three days of exceedance is permitted for the winter dry-weather season (November 1 to March 31), and the geometric mean limits must be met at all times. Some monitoring locations are allocated fewer than three allowable exceedance days in order to maintain existing water quality required by State and federal antidegradation provisions; a maximum of seventeen days of exceedance is permitted during the wet-weather season (defined as days with 0.1 inch or more of rain and the three days following the rain event) and the geometric mean limits must be met at all times. Some monitoring locations are allocated fewer than seventeen allowable exceedance days in order to maintain existing water quality as required by State and federal antidegradation provisions.
Urban runoff to Marina del Rey Harbor is regulated as a point source under the Los Angeles County Municipal Storm Water National Pollutant Discharge Elimination Systems (NPDES) Permit (MS4), the California Department of Transportation Storm Water Permit, any future Phase 2 Municipal Storm Water NPDES permits within the Santa Monica Bay watershed management area, and the General Construction and Industrial Storm Water Permits.
Nonpoint sources are given load allocations of zero days of allowable exceedances for each time period. The load allocation for the geometric mean for nonpoint sources is also zero days of allowable exceedances.
Resolution No R12-007, Amendment to the Water Quality Control Plan for the Los Angeles Region to Revise the Total Maximum Daily Loads for Bacteria in the Santa Monica Bay Beaches; the Marina del Rey Harbor Mothers' Beach and Back Basins; and the Los Angeles Harbor Inner Cabrillo Beach and Main Ship Channel and to Revise Implementation Provisions for Water Contact Recreation Bacteria Objectives
The basin plan amendment revises Resolution No. 2003-012 by revising allowable exceedances for the winter dry-weather a maximum of nine days through re-evaluation of the reference system. The amendment further refines the geometric mean implementation provisions in Resolution No. 2002-022 and applies them to this TMDL and provides that the regional board shall reconsider the TMDL by July 15, 2018.
Cal. Code Regs. Tit. 23, § 3939.4
2. Amendments to basin plan filed 11-7-2013; amendments approved by State Water Resources Control Board 3-19-2013 pursuant to Resolution No. 2013-0008; amendments approved by OAL pursuant to Government Code section 11353 11-7-2013 (Register 2013, No. 45).
2. Amendments to basin plan filed 11-7-2013; amendments approved by State Water Resources Control Board 3-19-2013 pursuant to Resolution No. 2013-0008; amendments approved by OAL pursuant to Government Code section 11353 11-7-2013 (Register 2013, No. 45).