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r <br /> JAN 1 7 2003 Condor Earth Technologies, Inc. <br /> SENVIRONMENT HEALTH 21663 Brian Lane Sonora CA 95370(209)532-0361 <br /> Pl=y 188 Frank West Circle Suite I Stockton CA 95206(209)234-0518 <br /> November 27, 2002 Condor Project No. 1707 <br /> FOURTH QUARTER GROUNDWATER MONITORING REPORT OCTOBER,2002 <br /> AND SOIL VAPOR EXTRACTION SYSTEM STATUS UPDATE <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: Jeff Wong, San Joaquin County Environmental Health Department(SJCEHD) <br /> Copy to: Marty Hartzel, California Regional Water Quality Control Board, Central Valley <br /> Region (CRWQCB) <br /> This is a report of the results of the fourth quarter, 2002 groundwater monitoring event conducted on <br /> October 14 and 15, 2002 at the above-referenced site. Figures indicating the site location, groundwater <br /> elevation contours, groundwater elevation fluctuations (hydrograph), benzene isoconcentration contours, <br /> MTBE isoconcentration contours and MTBE concentration in MW-3 (Attachment A, Figures 1, 2, 3, 4, 5, <br /> and 6, respectively) are attached to this report. Site background information, historical groundwater <br /> monitoring data, field forms, and laboratory analytical results are provided in Attachment B, C, D, and E, <br /> respectively. This report has been submitted to the SJCEHD and the CRWQCB as indicated above. <br /> Summary of October 2002 Quarterly Groundwater Monitoring Results <br /> Field Activi <br /> Number of groundwater wells 12 Number of groundwater wells sa led 12 <br /> Number of oundwater wells monitored 12 Date(s)monitored and sa led 10/14-15/02 <br /> _§!Itfflydrology <br /> Average depth to groundwater below 37.26 feet Average increase(+)/decrease() in + 3.61 feet <br /> monitoring well measuring points depths to groundwater since last sampling (Deeper) <br /> Approximate flow direction and 0.005 ft/ft Northeast as measured between wells <br /> groundwater Eadient MW-5 and MW-6. <br /> Groundwater Contamination <br /> Monitor wells containing free product None Monitor wells with detected odors 4 <br /> Number of wells with concentrations 6 Number of wells with concentrations at or 6 <br /> below the benzene and/or MTBE MCLS above the benzene and/or MTBE MCLS <br /> Nature of contamination: BTEX, Range of analyte concentrations detected <br /> TPH-G, in the monitor wells: <br /> MTBE Benzene(pg/L) <0.5—20,000 <br /> TPH-G(mg/L) <0.05—69 <br /> MTBE(µ <5.0—320 <br /> �� CON©OR <br />