Cal. Code Regs. tit. 23 § 3939.7
Los Angeles Regional Water Quality Control Board (Regional Board) Resolution No. 03-009, adopted on July 10, 2003 by the Regional Board, modified the regulatory provisions of the Water Quality Control Plan for the Los Angeles Region (Basin Plan) by (1) revising the Table of Contents, (2) adding introductory text for Chapter 7 (Total Maximum Daily Loads), and (3) establishing a Total Maximum Daily Load (TMDL) for nitrogen compounds and related effects in the Los Angeles River and its tributaries. The TMDL specifies concentration-based targets for ammonia, nitrate, nitrite, and combined nitrate and nitrite, which must be fully attained five years after the effective date of the TMDL. The TMDL includes a margin of safety with both implicit and explicit components.
Numeric targets will primarily be achieved by limiting the amount of nitrogen compounds discharged from three major wastewater treatment plants (Donald C. Tillman Water Reclamation Plant, Los Angeles-Glendale Water Reclamation Plant, and Burbank Water Reclamation Plant). To provide these major permitted discharges time to meet wasteload allocations, higher interim limits will be allowed for ammonia and combined nitrite and nitrate for a period of 3.5 years from the effective date of the TMDL. Compliance with the separate nitrate and nitrite wasteload allocations is not required during this interim period. Minor permitted point source dischargers are also assigned wasteload allocations, which must be met immediately. Load allocations for nonpoint sources may be developed if it is determined that they are necessary after wasteload allocations have been implemented.
Workplans for monitoring nitrogen compounds and related effects must be submitted by MS4 (municipal separate storm sewer systems) permittees and major National Pollutant Discharge Elimination System permittees within one year after the effective date of the TMDL. A special studies workplan to evaluate site-specific objectives, seasonal allocations, and point of compliance must be submitted by the City of Los Angeles within one year after the effective date of the TMDL, and the results of the studies within two and a half years after the effective date of the TMDL. Three and a half years after the effective date of the TMDL, if monitoring and study results indicate it is appropriate, the Regional Board will consider adopting site specific objectives for ammonia, nitrate, and nitrite and revising the TMDL. Five years after the effective date of the TMDL, the Regional Board will consider whether the numeric targets and wasteload allocations specified in the TMDL are sufficient to protect the Los Angeles River and its tributaries from the nutrient effects of discharged nitrogen compounds or whether the TMDL must be revised.
The Regional Board adopted Resolution No. 03-016 on December 4, 2003, which modified regulatory provisions of the Basin Plan by revising interim ammonia effluent limits for the Donald C. Tillman and Los Angeles-Glendale Water Reclamation Plants (WRPs) contained within the TMDL for nitrogen compounds and related effects for the Los Angeles River. The thirty-day average and daily maximum interim limits for total ammonia as nitrogen for the Donald C. Tillman WRP were changed from 21.0 and 21.7 milligrams per liter (mg/L), respectively, to 20.5 and 24.7 mg/L. For the Los Angeles-Glendale WRP, the thirty-day average and daily maximum interim limits for total ammonia as nitrogen were changed from 16.5 and 19.4 mg/L, respectively, to 18.8 and 24.2 mg/L.
The Regional Board adopted Resolution No. 12-010 on December 6, 2012, which modified regulatory provisions of the Basin Plan by revising the TMDL for nitrogen compounds and related effects for the Los Angeles River. The TMDL was revised to adjust the numeric targets for the Burbank Western Channel and Reaches 3-5 of the Los Angeles River to reflect formulaic site-specific 30-day ammonia objectives previously adopted as a Basin Plan Amendment (23 CCR § 3939.1). Corresponding adjustments were made to the chronic ammonia waste load allocations (WLAs) for:
Cal. Code Regs. Tit. 23, § 3939.7
2. Amendment to basin plan filed 6-9-2014; amendments approved by State Water Resources Control Board 6-4-2013 pursuant to Resolution No. 2013-0016; amendments approved by OAL pursuant to Government Code section 11353 6-9-2014 (Register 2014, No. 24).
2. Amendment to basin plan filed 6/9/2014; amendments approved by State Water Resources Control Board 6-4-2013 pursuant to Resolution No. 2013-0016; amendments approved by OAL pursuant to Government Code section 11353 6-9-2014 (Register 2014, No. 24).