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RED E <br /> JAN 1 7 2003 Condor Earth Technologies, Inc. <br /> ENVIRUI VP LlV i HEALI H 21663 Brian Lane Sonora CA 95370 (209)532-0361 <br /> PERMIT SERVICES 188 Frank West Circle Suite I Stockton CA 95206(209) 234-0518 <br /> November 26, 2002 Condor Project No. 2038 <br /> FOURTH QUARTER GROUNDWATER MONITORING REPORT <br /> OCTOBER 2002 <br /> Site Address Canepa's Car Wash <br /> 248 East Park Street <br /> Stockton, California <br /> Client: Mr Remo Canepa <br /> 1536 North Hunter Street <br /> Stockton, California <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 fourth quarter 2002 groundwater monitoring event conducted on <br /> October 17, 2002 at the above-referenced site Figures indicating the site location, groundwater elevation <br /> contours and estimated groundwater gradient, groundwater elevation fluctuations, MTBE iso-concentration <br /> contours, benzene iso-concentration contours, benzene concentrations and groundwater elevations versus time <br /> in monitor well MW-2,benzene concentrations and groundwater elevations versus time in monitor well MW- <br /> 5, and MTBE concentrations and groundwater elevations versus time in MW-6 (Figures 1 through 8, <br /> respectively) are included as Attachment A Historical site information, field forms, and laboratory analytical <br /> results are included as Attachments B, C, and D, respectively This report has been submitted to the SJCEHD <br /> and the CRWQCB, as referenced above <br /> Summary of October 2002 Quarterly Groundwater Monitoring Results <br /> Field Activity <br /> Number of monitor wells 7 Number of mo tor wells sampled 7 <br /> Date(s)monitored 10/17/2002 <br /> Site Hydrology <br /> _ <br /> Average depth to groundwater below 26 86 feet Average increase(+)/decrease H in depths +1 60 feet <br /> monitor well measuring points (bgs) bgs to roundwater since last sampling Deeper <br /> £he lowest(deepest) groundwater elevation <br /> Approximate groundwater flow direction Northeast has consistently been measured at monitor <br /> well MW-2 <br /> Groundwater Contamination <br /> Wells containing free product None Wells with detected odors 2 <br /> Number of wells with benzene Number of wells with benzene <br /> concentrations below the benzene MCL 5 concentrations at or above benzene MCL 2 <br /> BTEX Range in concentrations <br /> Nature of contamination TPH-G Benzene(gg/L) <0 5—9,400 <br /> M TBE TPH-G(mg/L) <0 05—61 <br /> . MTBE( ) 26- 17 <br /> I <br /> M� CONDOR <br />