- (a) On May 5, 2011, the Los Angeles Regional Water Quality Control Board (Los Angeles Water Board) adopted Resolution No. R11-008, amending the Water Quality Control Plan for the Los Angeles Region by establishing a Total Maximum Daily Load (TMDL) for Toxic Pollutants in Dominguez Channel and Greater Los Angeles and Long Beach Harbor Waters. The TMDL includes numeric targets for the water column based on California Toxics Rule criteria for protection of human health; sediment targets based on the narrative standards of the Basin Plan, the Enclosed Bays and Estuaries Plan, Sediment Quality Objectives (SQOs) Part 1, and sediment quality guidelines compiled by the National Oceanic and Atmospheric Administration; and fish tissue targets based on Office of Environmental Health Hazard Assessment (OEHHA) Fish Contaminant Goals. Load allocations (LAs) are assigned to direct atmospheric deposition and bed sediments. Waste load allocations (WLAs) are assigned to stormwater discharges from municipal separate storm sewer systems, California Department of Transportation (Caltrans) facilities, and construction and industrial facilities, and other NPDES permitted discharges in both wet and dry weather. Dominguez Channel freshwater allocations are set for wet weather only because exceedances of water quality standards have only been documented in wet weather. The implementation plan includes a variety of implementation strategies to meet the required WLAs and LAs by reducing sediment transport from the upstream and nearshore watersheds to Dominguez Channel and Greater Los Angeles and Long Beach Harbor Waters and implementing targeted actions addressing identified hotspots.
- (b) On October 13, 2022, the Los Angeles Water Board adopted Resolution R22-005, amending the Water Quality Control Plan to revise the TMDL for Toxic Pollutants in Dominguez Channel and Greater Los Angeles and Long Beach Harbor Waters. The Basin Plan amendment adopted by the Resolution No. R22-005 revises the TMDL adopted by Resolution No. R11-008 to incorporate the updated Sediment Quality Provisions (SQPs), including SQOs for the protection of the benthic community and human health, into compliance options for the WLAs and LAs; additional source assessment and implementation recommendations for polychlorinated biphenyls (PCBs); additional linkage analysis; revisions to monitoring requirements to require improved PCBs methods; revisions of the fish tissue monitoring frequency to be consistent with sediment sampling; and other revisions to correct errors or for clarification.
History
1. New section summarizing amendments to basin plan filed 3-21-2012; amendments approved by State Water Resources Control Board Resolution No. 2012-0008 on 2-7-2012; amendments approved by OAL pursuant to Government Code section 11353 on 3-21-2012 (Register 2012, No. 12).
2. Redesignation and amendment of section as subsection (a) and new subsection (b) summarizing amendments to basin plan filed 8-15-2025; amendment approved by State Water Resources Control Board Resolution No. 2024-0005 on 1-17-2024; amendment approved by OAL pursuant to Government Code section 11353 on 8-15-2025 (Register 2025, No. 33).