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 3939.46 - Implementation Plans and Schedules for the los Cerritos Channel Metals Total Maximum Daily Load (TMDL), and the San Gabriel River and Impaired Tributaries Metals and Selenium TMDL

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
On June 6, 2013, the Los Angeles Regional Water Quality
					 Control Board (Regional Board) adopted Resolution No. R13-004, amending the
					 Water Quality Control Plan for the Los Angeles Region (Basin Plan) by
					 establishing implementation plans and schedules for the Los Cerritos Channel
					 Metals TMDL and the San Gabriel River and Impaired Tributaries and Selenium
					 TMDL. The Los Cerritos Channel Metals TMDL and the San Gabriel River and
					 Impaired Tributaries and Selenium TMDL were previously established by the
					 United States Environmental Protection Agency (U.S. EPA).
The implementation plans for the Los Cerritos Channel and
					 San Gabriel River Metals TMDLs require MS4 permittees (including Caltrans) to
					 demonstrate a progressive reduction in pollutant loading at milestones in 2017,
					 2020, and 2023, and must meet both the dry-weather and wet-weather waste load
					 allocations (WLAs) for copper, lead, and zinc by September 30, 2026.
The U.S. EPA-established TMDLs assign dry-weather WLAs
					 equal to zero to unauthorized non-storm water discharges. Authorized non-storm
					 water discharges from construction or industrial activities must comply with
					 concentration-based limits equal to the WLAs assigned to the "other NPDES
					 permits", as defined in the U.S. EPA-established TMDLs. The implementation
					 plans clarify that WLAs will be incorporated into permits as effluent
					 limitations consistent with the assumptions and requirements of the
					 WLAs.
The implementation plans specify effluent limitations that
					 are consistent with the concentration-based WLAs established for non-storm
					 water point sources in the TMDLs. For the major, minor, and general NPDES
					 permits, WLAs may be translated into daily maximum and monthly average effluent
					 limitations by applying appropriate methodologies subject to Los Angeles Water
					 Board Executive Officer approval, such as procedures from the State Water
					 Board's Policy for Implementation of Toxics Standards for Inland Surface
					 Waters, Enclosed Bays, and Estuaries of California.
The implementation plans explain that nonpoint sources will
					 be regulated through the authority contained in the California Water Code, in
					 conjunction with the State Water Board's Policy for Implementation and
					 Enforcement of the Nonpoint Source Pollution Control Program.
1. New
					 section summarizing amendments to basin plan filed 10-13-2014; amendments
					 approved by State Water Resources Control Board Resolution No. 2014-0012 on
					 3-4-2014; amendments approved by OAL pursuant to Government Code section
					 11353 on
					 10-13-2014 (Register 2014, No. 42).