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A <br /> i Condor Earth Technologies, Inc. <br /> 21663 Brian Lane Sonora CA 95370(209)532-0361 <br /> 188 Frank West Circle Suite I Stockton CA 95206 (209)234-0518 <br /> August 20,2002 Condor Protect No. 2038 <br /> THIRD QUARTER GROUNDWATER MONITORING REPORT <br /> JULY 2002 <br /> Site Address Canepa's Car Wash MID <br /> ll �! <br /> 248 East Park Street <br /> Stockton, California OCT 0 3 2002 <br /> Client Mr Remo Canepa <br /> 1536 North Hunter Street ENVIRONMENT HEALTH <br /> Stockton, California PERMIT/SERVICES <br /> Primary Agency Jeffrey C F Wong, San Joaquin County Environmental Health Department(SJCEHD) <br /> Copy to Marty Hartzel, California Regional Water Quality Control Board (CRWQCB) <br /> This report documents the results of the third quarter, 2002 groundwater monitoring event conducted on July 5, <br /> 2002 at the above-referenced site Figures indicating the site location, groundwater elevation contours and <br /> estimated groundwater gradient groundwater elevation fluctuations, MTBE iso-concentration contours, <br /> . benzene iso-concentration contours, benzene concentrations versus time in monitor well MW-2, benzene <br /> concentrations versus time in monitor well MW-5, and MTBE concentrations versus time in MW-6 (Figures I <br /> through 8, respectively) are included as Attachment A Historic al site information is included as Attachment B <br /> Field forms and laboratory analytical results are included as Attachments C and D, respectively This report <br /> has been submitted to the SJCEHD and the CRWQCB <br /> Summary of July 2002 Quarterly Groundwater Monitoring Results <br /> -Field Activity <br /> Number of monitor wells 7 Number of monitor wells sampled 7 <br /> Date(s) monitored 7/5/2002 <br /> Site Hydrology <br /> Average depth to groundwater below 25 26 feet Average increase(+)/decrease(—) in depths7Deeper <br /> 63 feet <br /> monitor well measuring points (bgs) bgs to groundwater since last sam hn <br /> Approximate flow direction and Northeast rhe lowest(deepest)groundwater elevation <br /> groundwater gradient 0 0101 ft/ft has consistently been measured at monitor <br /> well MW-2 <br /> Groundwater Contamination <br /> Wells containing tree product None Wells with detected odors2 <br /> Number of wells with benzene 5 Number of wells with benzene _ — 2 <br /> concentrations below the benzene MCL concentrations at or above benzene MCL <br /> BTEX Range in concentrations <br /> Nature of contaminatron TPF1-Ci Benzene(pg/L) <0 5- 8,200 <br /> I PFI-G(mg/L) <0 05-4;1 <br /> MI BE MTBE( L) 1 <05- 19 <br /> Is <br /> al� CONDOR <br />