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Memo to Antonia h . .arster -2- 27 June 1985 On 21 June I went to the Stockton Treatment Plant to Investigate. I first met with Lynn Norton , Wastewater Superintendant , Jim Griffith, Plant Manager, and Laura Lazelle, Lab Supervisor. I said that I wanted a chronology of all operational procedures for at least the last week relating to the chlorine, coliform, and pH violations. Said chronology will be ready Monday a.m. , 24 June. After lunch , I went with Laura Lazelle and two people with the Stockton Record on the City of Stockton ' s boat to view the kill . There were many , many dead fish ( 99% catfish, very few carp and bluegill ) . Most of the fish were between French Camp Slough and the Port . I took documenting photographs. Lazelle took field D. O. and Res . Cl . measurements at the outfall and downstream. D.O. was between 3 and 4 ppm and Cl . was ( 0. 05 ppm. On the trip, no obvious sources of toxins were observed. On my return , I met with Emmett Lenihan of DFG . He said that they had also been on the river earlier in the day. They col- lected some catfish and observed conditions. Lenihan will have their biologist look at the fish to determine cause of death. on 24 June I got a call from DFG . They inspected the river thoroughly on 22 June and could come up with no other sources. They suspect Stockton Sewage Treatment Plant. on 24 June I called Stockton. Between 1600 hours on 19 June and 100 on 20 June , they discharged between 0. 1 and 4 . 4 ppm Cl . in their effluent. Proposed Course of Action The City of Stockton is the obvious "suspect" as the Discharger who killed the fish. The concentration of residual chlorine in the discharge, and the timing of the discharge and the fish kill point to Stockton . I think we should wait until we get the chronology and report from DFG before proceeding. DTW: jec 4 <