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MONITORING AND REPORTING PROGRAM NO. 95-062 -3- <br /> SETTLING DRY CLEANING DEFENDANTS <br /> LINCOLN PILLAGE CENTER <br /> GROUNDWATER TREATMENT SYSTEM <br /> SAN JOAQUIN COUNTY <br /> BTEX=analyses for benzene,toluene,xylene and ethylbenzene by EPA Method 602 or equivalent. If any <br /> monthly sample contains detectable concentrations of BTEX constiment(s)above the PQL of 0.5 4g/1,the <br /> Discharger shall immediately resample and reanalyze the effluent for the detected constitoent(s), and shall <br /> continue sampling the effluent on a weekly basis until the constiment(s) concentrations are below the PQL. <br /> 4 If any quarterly sample shows a detectable lead concentration,the Discharger shall increase the sampling <br /> frequency to monthly. <br /> By EPA Method 8260. All detected compounds shall be reported. <br /> THREE SPECIES CHRONIC TOXICITY MONITORING <br /> Effluent toxicity monitoring shall be conducted to determine whether the effluent is likely to contribute <br /> toxicity to Fourteen Mile Slough. The monitoring shall be conducted as specified in the EPA 600/4-91- <br /> 002. Effluent toxicity samples shall be collected at the discharge of the treatment system prior to being <br /> discharged into the storm drain. Grab samples shall be representative of the volume and quality of the <br /> discharge. Time of collection of samples shall be recorded. The effluent tests must be conducted with <br /> concurrent reference toxicity tests. Monthly laboratory reference toxicity tests may be substituted upon <br /> approval. Both the reference toxicant and effluent test must meet all test acceptability criteria as specified <br /> in the EPA manual. If the test acceptability criteria are not achieved, then the Discharger must re-sample <br /> and re-test within 14 days. Chronic toxicity monitoring shall include the following: <br /> Species: Pimephales promelas, Ceriodaphnia dubia, and Selenastrum Canricomutum <br /> Frequency: Annually, the first sample to occur within the first month of <br /> startup of the treatment plant <br /> Dilution Series: The Discharger shall conduct the chronic toxicity testing using 100% <br /> effluent and two controls. If toxicity is found in any of the 100% effluent <br /> tests, the Discharger must immediately retest using the full sampling protocol <br /> of 5 dilutions and 2 controls listed below. <br /> Dilutions (%) Controls <br /> Receiving Lab <br /> 100 75 50 25 12.5 Water Water <br /> • GWTP Effluent 100 75 50 25 12.5 0 0 <br /> • Dilution Water' 0 25 50 75 87.5 100 0 <br /> % Lab Water2 0 0 0 0 0 100 <br /> Dilution water shall be receiving water from Fourteen Mile Slough taken upstream from the discharge point. <br /> The dilution series may be altered upon approval of Regional Board staff. <br /> 2 Lab water shall meet EPA protocol requirements. <br />