Chlorinated compounds in coastal power plant cooling waters

Results are presented based on 4 months of a 12 month study funded by EPA of chlorination practices at 5 coastal power plants in California. The plants are all owned and operated by the Pacific Gas and Electric Company. They include Potrero and Hunters Point in the Central Bay Region of the San Francisco Bay system, Pittsburg on Suisun Bay, Contra Costa on the San Joaquin River, and Moss Landing on Monterey Bay. Typical cooling water system layout is discussed with special emphasis on chlorination procedures. At all the plants chlorine is injected as a concentrated solution into a holding well located at the intake before the circulating water pumps. Halogen residuals are measured by the power plant chemist at the condenser inlet and this measured resid-