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MONITORING AND REPORTING PROGRAM -2- CITY OF STOCKTON AUSTIN ROAD LANDFILL GROUNDWATER TREATMENT SYSTEM SAN JOAQUIN COUNTY ' By USEPA Method 601 or equivalent,with a maximum PQL of 0.5 Rg/l. 2 If any sample shows detectable volatile organics,the Discharger shall immediately resample and reanalyze the effluent for the detected constituent(s), and shall continue sampling the effluent on a weekly basis until the constituent(s) concentrations are below detection. TTREE SPECIES CHRONIC TOXICITY MONITORING Effluent toxicity monitoring shall be conducted to determine whether the effluent is contributing toxicity to Littlejohn Creek. The monitoring shall be conducted as specified in the EPA 600/4- 91-002. Effluent toxicity samples shall be collected at the discharge from a manhole prior to be discharged into Littlejohn Creek. Grab samples shall be representative of the volume and quality of the discharge. Time of collection of samples shall be recorded. The effluent tests must be conducted with concurrent reference toxicity tests. Monthly laboratory reference toxicity tests may be substituted upon approval. Both the reference toxicant and effluent test must meet all test acceptability criteria as specified in the EPA 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: PimeMhales promelas, Ceriodaphnia dubia, and Selenastrum Capricornutum Frequency: Quarterly Dilution Series: Dilutions (%) Controls Canal Lab 100 75 50 25 12.5 Water Water % GWTP Effluent 100 75 50 25 12.5 0 0 %Dilution Water' 0 25 50 75 87.5 100 0 %Lab Water' 0 0 0 0 0 0 100 '-Dilution water shall be receiving water from Littlejohn Creek taken upstream from the discharge point. The dilution series may be altered upon approval of Regional Board staff. 2-Lab water shall meet EPA protocol requirements.