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' QUARTERLY MONITORING REPORT JULY 1997 <br /> CANEPA S CAR WASH <br /> 0 6230 Pacific Avenue Stockton CA <br />' August 14, 1997 <br /> Appendix A) Indicates groundwater mounding in the center of the site in the vicinity of MW-I and <br />' MW-2 This is generally consistent with previous monitoring results Attempts have been made by <br /> previous consultants to explain this apparent local recharge with a potentially leaky sewer line <br /> Hydrographs of monitor wells MW-1 through MW-8, presented in Figure 4, Appendix A, Illustrate the <br /> fluctuation of the groundwater table Historical groundwater measurements are provided in the <br />' accompanying Hydrograph Table <br /> The results of the laboratory analyses indicate that TPH-G, BTEX, and MTBE were detected <br /> in groundwater samples collected during the sampling event Benzene concentrations detected in MW- <br /> 1, MW-2, and SV-3 exceed the maximum contaminant level (MCL) for benzene (1 0 µg/L) in <br /> drinking water (California Code of Regulations, Title 22, Drinking Water Regulatory Criteria) No <br /> MCL has yet been established for MTBE The California Department of Health Services has set an <br /> action level of 35 ggIL for MTBE in drinking water, however MTBE concentrations detected in <br /> groundwater samples from MW-1, MW-2, and SV-3 exceed that Ievel <br /> fAnalytical results for the July, 1997, sampling are generally consistent with historical <br /> analytical results The historical groundwater analytical data for the site are presented in Table A, <br /> Appendix B <br /> Floating product was not observed in any of the wells during the July, 1997, quarterly <br /> sampling Slight petroleum hydrocarbon odor was noted in MW-1 and MW-2 Strong petroleum <br /> hydrocarbon odor was noted in SV-3 Floating product has not been reported during groundwater <br /> monitoring from June, 1994, through July, 1997 <br /> IThe next quarterly monitoring event is scheduled for October, 1997 If you need additional <br /> information or have any questions please contact us at (209) 668-9234 <br /> Respectfully submitted, ,��RED GFD�0C <br /> �--��-e. ♦�� DOHALD F DESS <br /> NO.6430 <br /> I <br /> R David Meade �l�F �Q� aid F Kresse <br /> Project Geologist OF CA��� aliforhia Registered <br /> Condor Earth Technologies, Inc Geologist 46430 <br /> I <br />■ <br /> I <br /> CANS QT 97 <br /> Page -5- <br /> l <br /> I t�a CONDOR <br />