Cal. Code Regs. tit. 23 § 3939.42
On September 2, 2010, the Los Angeles Regional Water Quality Control Board adopted Resolution No. R10-008, amending the Water Quality Control Plan for the Los Angeles Region by establishing a Total Maximum Daily Load (TMDL) for Pesticides and Polychlorinated Biphenyls (PCBs) in Machado Lake. The TMDL includes numeric targets for sediment based on the freshwater Threshold Effect Concentration sediment quality guidelines compiled by the National Oceanic and Atmospheric Administration, for the water column based on California Toxics Rule criteria for protection of human health, and for fish tissue based on the Fish Contaminant Goals issued by the Office of Environmental Health Hazard Assessment. The TMDL waste load allocations for point source discharges and load allocations for nonpoint source discharges are established to attain the TMDL numeric targets. The TMDL waste load allocations are for discharges from the watershed to Machado Lake and load allocations are for internal sources of pesticides and PCBs from the lake sediments.
The regulatory mechanisms used to implement the TMDL waste load allocations include the Los Angeles County municipal separate storm sewer system (MS4) permit, the Caltrans stormwater permit, the general industrial stormwater National Pollutant Discharge Elimination System (NPDES) permit, the general construction stormwater NPDES permit, and other non-stormwater NPDES permits. Nonpoint sources may be regulated through a Memorandum of Agreement (MOA) between the responsible parties and the Regional Board Executive Officer. The MOA shall comply with the Water Quality Control Policy for Addressing Impaired Waters: Regulatory Structure and Options ("Policy"), including part II section 2 c ii and related provisions. The implementation of the MOA must result in attainment of the TMDL load allocations. If the MOA does not result in the attainment of the TMDL load allocations, the MOA will be rescinded and the load allocations shall be implemented through a cleanup and abatement order.
The TMDL requires dischargers to attain the waste load and load allocations by September 30, 2019. The TMDL requires responsible parties for the waste load allocations to submit a monitoring and reporting plan within six months of the effective date of the TMDL. The TMDL requires responsible parties for the load allocations to enter into an MOA with the Regional Board within one year of the effective date of the TMDL and to submit a Lake Water Quality Management Plan within one and one half years of the effective date of the TMDL.
Cal. Code Regs. Tit. 23, § 3939.42