316(b) Compliance, Entrainment and Impingement Studies

There are multiple coastal power plants in Southern California that withdraw once through cooling water and are subject to 316(b) regulations. The 316(b) Phase II regulations for existing power plants required an analysis of current entrainment and impingement rates of fish and shellfish. Potential compliance pathways included installation of fish protection technologies, alternative cooling methods, restoration, and economic (cost-cost and cost-benefit analyses). MBC was contracted to provide initial planning/strategy, conduct Impingement Mortality and Entrainment (IM&E) studies, prepare required documentation and reports, and provide representation at regulatory meetings. Year-long IM&E studies were conducted at seven coastal power plants. These included weekly impingement surveys and biweekly entrainment and source water surveys at most sites. Multiple ADCPs were deployed to characterize current movement and allow estimation of source populations at risk of entrainment.

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Multiple Clients


Marine Services


Southern California

Marine Services


Port of Long Beach Sediment Characterization

The Port of Long Beach contracted MBC to characterize the sediments at three different sites prior to implementing Phase II of their Maintenance Dredge Program.

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San Onofre Unit 1 Decommissioning Surveys

MBC supported AECOM in monitoring the offshore construction to set the SONGS Unit 1 offshore conduits to their final disposition.

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Port of Long Beach Middle Harbor Construction Monitoring

MBC provided U.S. Fish & Wildlife qualified biologists to monitor potential fish mortality and the presence of marine mammals that may be harmed during construction.

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