California Code of Regulations › Title 23 - Waters › Division 4 - Regional Water Quality Control Boards › Chapter 1 - Water Quality Control Plans, Policies, and Guidelines › Article 4 - Los Angeles Region › Section 3939.4 - Total Maximum Daily Load for Bacteria at Marina Del Rey Mothers' Beach and Back Basins

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
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.
1. New
					 section summarizing amendments to the L.A. Basin Plan filed 1-30-2004;
					 amendments adopted by the Los Angeles Regional Water Quality Control Board
					 8-7-2003 pursuant to Resolution No. 2003-12. Approved by State Water Resources
					 Control Board 11-19-2003 pursuant to Resolution 2003-0072; approved by OAL
					 1-30-2004 pursuant to Government Code section
					 11353
					 (Register 2004, No. 5).
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).