Cal. Code Regs. tit. 23 § 3979.6
On July 15, 2011, the Santa Ana Regional Water Quality Control Board (Regional Water Board) adopted Resolution R8-2011-0037, amending the Water Quality Control Plan for the Santa Ana Region. The State Water Resources Control Board (State Water Board) approved the amendment under Resolution 2012-0051 on October 16, 2012.
Resolution R8-2011-0037 establishes Total Maximum Daily Loads (TMDLs) for 1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane (DDT) and toxaphene in San Diego Creek and its tributaries; chlordane, DDT, and polychlorinated biphenyl (PCBs) in Upper Newport Bay; and, chlordane, DDT, and PCBs in Lower Newport Bay. The Basin Plan amendment also establishes informational TMDLs for chlordane and PCBs for San Diego Creek and its tributaries. DDT, toxaphene, chlordane, and PCBs are organochlorine compounds. The TMDL allocations are assigned to urban, construction and roadway (California Department of Transportation) discharges, commercial nurseries, agricultural discharges, open space discharges, streams and channels and undefined sources.
The implementation plan for the TMDLs that is identified in the amendment addresses organochlorine compound impairment in the affected waters in an adaptive, phased manner. The plan focuses on accelerating the natural attenuation of these compounds in the watershed through enhanced implementation of Best Management Practices (BMPs) by responsible parties to reduce the erosion and transport to surface waters of fine sediment to which the organochlorine compounds tend to adhere. Many of these BMPs are already in place as the result of existing permits issued by the Regional Water Board or State Water Board for storm water and construction activities, and/or in response to other established TMDLs. Monitoring and special investigation results will be used to consider refinements to both the BMPs and the TMDLs. Revisions to the TMDLs will be considered through the Basin Planning process. Compliance with sediment, water column and fish tissue targets that protect human health and aquatic habitat and attainment of Basin Plan water quality objectives, is to be achieved as soon as possible, but no later than December 31, 2020.
Cal. Code Regs. Tit. 23, § 3979.6