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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Marine Services


Southern California

Marine Services


Doheny Ocean Desalination Project

The South Coast Water District proposed the Doheny Ocean Desalination Project to produce approximately 5 to 15 million gallons per day (mgd) of potable drinking water. The project would consist of a subsurface slant well intake system, raw (sea) water conveyance to the desalination facility site, a seawater desalination plant, brine disposal through an existing wastewater ocean outfall, solids handling facilities, and potable water delivery to adjacent distribution infrastructure.

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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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