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ATTACHMENT D STATE OF CALIFORNIA-THE RESOURCES AGENCY GEOR� DEPARTMENT OF FISH AND GAME 116 NINTH STREET rt 4 SACRAMENTO, CALIFORNIA 95614 AUG 9 I 25 OSI FqF' (916) 445-1383 August 6 , 1985 William H. Crooks , Executive officer California Regional Water Quality Control Board Central Valley Region 3201 S Street Sacramento, CA 95816-7090 Dear Mr. Crooks : re: Investigation of Fish Kill in San Joaquin River The Department of Fish and Game (DFG) has concluded that waste discharges from the City of Stockton Regional Waste Water Treatment Plant (SRWWTP) were responsible for a fish kill in the San Joaquin River on the 19th and 20th of June , 1985 . A combination of low pH and high residual chlorine in the effluent coupled with low dilution at the point of discharge caused the death of approximately 5 ,000 fish and other undetermined biota. Replacement value for these animals is approximately $5,000 . The discharge violation and resulting fish kill were reported to Fish and Game Warden Emmett Lenihan at 1500 hours , June 20 , 1985. Warden Lenihan arrived on the scene at 1800 hours and noted that several hundred channel catfish Ictalurus punctatus, and other fish were floating on the surface with the largest concentration near the SRWWTP. James Griffin, Assistant Manager at SRWWTP, admitted that large amounts of waste water which was not dechlorinated was discharged into the river. SRWWTP records indicate approximately 25 million gallons of effluent with high residual chlorine and low pH values were discharged on the 19th and 20th of June. Flow records for the river indicate low volume reverse flow conditions were in effect and SRWWTP effluent made up an estimated two-thirds of total river flow. Possible causes for the fish kill was investigated as follows : Using the assumption that toxic materials entering the river other than SRWWTP would kill biota at pooiint nearest the source , canals i _/ O