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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 /> March 10,2002 Condor Project No. 1707 <br /> FIRST QUARTER GROUNDWATER MONITORING REPORT <br /> JANUARY 2002 <br /> Site Address: Canepa's Car Wash o �'��51] <br /> 6230 Pacific Avenue ' I it <br /> Stockton, California <br /> MAR 13 2002 <br /> Client: Mr. Remo Canepa <br /> 1536 N. Hunter Street ENVIRONAI;` NT HEALTH <br /> Stockton, California PERMIT/SERVICES <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 first quarter, 2002 groundwater monitoring event conducted on <br /> January 9 and 10, 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 January 2002 Quarterly Groundwater Monitoring Results <br /> Field Activity <br /> Number of groundwater wells 12 Number of groundwater wells sampled 12 <br /> Number of groundwater wells monitored 12 Date(s)monitored and sampled 1/9 - 10/02 <br /> Site Hydrology <br /> Average depth to groundwater below 34.03 feet Average increase(+)/decrease(—) in depths —0.82 feet <br /> monitoring well measuring points to groundwater since last sampling <br /> Approximate flow direction and 0.004 ft/ft east-norththeast as measured <br /> groundwater gradient between wells MW-3 and MW-6. <br /> Groundwater Contamination <br /> Wells containing free product None Wells with detected odors 3 <br /> Number of wells with concentrations 7 Number of wells with concentrations at or 5 <br /> below the benzene or MTBE MCL above the benzene or MTBE MCL <br /> Nature of contamination: BTEX, Range in concentrations: <br /> TPH-G Benzene(µg/L) <0.3-22,300 <br /> MTBE TPH-G (mg/L) <0.05-64 <br /> MTBE (gg/L) <!.0-580 <br /> ia CONDOR <br />