SITE INFORMATION AND CORRESPONDENCE

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MONITORING AND REPORTING PROGRAM NO. 5-01-119 (REVISED) -4- STOCKTON COGEN COMPANY SAN JOAQUIN COUNTY North Littlejohns Creek. Grab samples shall be representative of the volume and quality of the discharge. Time of collection samples shall be recorded. The effluent tests must be conducted with concurrent reference toxicant tests. Both the reference toxicant and effluent test must meet all test acceptability criteria as specified in the chronic manual. If the test acceptability criteria are not achieved, then the Discharger must re-sample and re-test within 14 days. Chronic toxicity monitoring shall include the following: Species: Pimephales promelas, Ceriodaphnia dubia, and Selenastrum capricornutum The Discharger shall conduct the chronic toxicity test quarterly(4 times per year) using 100% effluent and 2 controls. If no toxicity is found in any of the tests during the first year of quarterly testing, the frequency of testing shall be reduced to annually. If toxicity is found in any of the effluent tests, the Discharger must immediately retest using the full sampling protocol of 5 dilutions listed below and initiate the TIE pursuant to Provision 6 of the Order. Thereafter, quarterly testing must be conducted for the duration of the permit. Dilution Series: Dilutions (%) Controls 100 50 25 12.5 6.25 Creek Lab Water Water %WWTP Effluent 100 50 25 12.5 6.25 0 0 %Dilution Water* 0 50 75 87.5 93.75 100 0 %Lab Water 0 0 0 0 0 0 100 * - Dilution water shall be receiving water from North Littlejohns Creek taken upstream from the discharge point. WATER SUPPLY MONITORING A sampling station shall be established where a representative sample of the municipal water supply can be obtained. Water supply monitoring shall include at least the following: Sampling Constituents Units Frequency Standard Minerals mg/l Annually Electrical Conductivity µmhos/cm Quarterly @ 25°C Total Dissolved Solids mg/l Annually