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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 /> June 12,2002 Condor Project No. 1707 <br /> SECOND QUARTER GROUNDWATER MONITORING REPORT APRIL,2002 <br /> AND SOIL VAPOR EXTRACTION SYSTEM STATUS UPDATE 'r <br /> Site Address: Canepa's Car Wash <br /> 6230 Pacific Avenue <br /> Stockton, California <br /> Client: Mr. Remo Canepa <br /> 1536 N. Hunter Street - <br /> Stockton, California <br /> Primary Agency: Jeffrey Wong, San Joaquin County Public Health Services, Environmental Health <br /> Department(PHS/EHD) <br /> Copy to: Marty Hartzel, California Regional Water Quality Control Board(CRWQCB) <br /> This is a report of the results of the second quarter, 2002 groundwater monitoring event conducted on <br /> April 10 and 11, 2002 at the above-referenced site. Maps indicating the site location, groundwater <br /> elevation contours, benzene iso-concentration contours, MTBE iso-concentration contours and MTBE <br /> concentration in MW-3 (Attachment A, Figures 1, 2, 3, 4, 5, and 6, respectively) are attached to this <br /> report. Also attached are site background information, historical monitoring data, field forms, and <br /> laboratory analytical results. This report has been submitted to the PHS/EHD and the CRWQCB as <br /> indicated above. <br /> Summary of April 2002 Quarterly Groundwater Monitoring Results <br /> Field Activity <br /> Number of groundwater wells 12 Number of groundwater wells sam led =2 <br /> Number of groundwater wells monitored 12 Date(s) monitored and sampled 4/10 - 11/02 <br /> Site Hydrology <br /> Average depth to groundwater below 32.87 feet Average increase(+)/decrease(—) in — 1.16 feet <br /> monitoring well measuring points depths to groundwater since last sampling (Shallower) <br /> Approximate flow direction and 0.004 ft/ft cast-norththeast as measured <br /> groundwater radient I between wells MW-3 and MW-6. <br /> € Groundwater Contamination <br /> Wells containing free product None Wells with detected odors 4 <br /> Number of wells with concentrations 6 Number of wells with concentrations at or 3 <br /> below the benzene and MTBE MCL above the benzene and MTBE MCL <br /> Nature of contamination: BTEX. Range in concentrations: <br /> TPH-G, V Benzene (lig/L) <0.5— 12,000 <br /> MTBE TPH-G (mg/L) <0.05—40 <br /> MTBE (Itg L) <5.0—2,300 <br /> A <br /> C CONDOR <br /> it <br />