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<br /> Condor Earth Technologies, Inc.
<br /> 21663 Brian Lane Sonora CA 95370 (209) 532-0361
<br /> 188 Frank Nest Circle Suite I Stockton CA 95206 (209)234-0518
<br /> December 18, 2003 Condor Project No. 1707
<br /> FOURTH QUARTER GROUNDWATER MONITORING REPORT
<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: James Barton, California Regional Water Quality Control Board, Central Valley
<br /> Region (CRWQCB)
<br /> This is a report of the results of the fourth quarter 2003 groundwater monitoring event conducted
<br /> November 9, 2003, at the above-referenced site. Figures indicating the site location, groundwater
<br /> elevation contours, groundwater elevation fluctuations (hydrograph), benzene iso-concentration contours,
<br /> MTBE iso-concentration contours, and historical MTBE concentrations in MW-3 (Attachment A, Figures
<br /> 1, 2, 3, 4, 5, and 6, respectively) are attached to this report. Site background information, historical
<br /> groundwater monitoring data, field forms, and laboratory analytical results are provided in Attachment B,
<br /> C, D, and E, respectively. This report has been submitted to the SJCEHD and the CRWQCB as indicated
<br /> above.
<br /> In a letter to Mr. Jeff Wong of the SJCEHD dated October 2, 2002, Condor proposed annual monitoring
<br /> of site monitor wells MW-5, MW-6, and MW-7 (reduced from quarterly) and destruction of MW-8 and
<br /> MW-10. In a letter dated February 4, 2003, Mr. Wong indicated that annual sampling of MW-5, MW-6,
<br /> and MW-7 and destruction of MW-8 were approved but that annual monitoring of MW-10 was necessary.
<br /> Mr. Wong also indicated that MW-8 would need to be replaced and an additional down-gradient monitor
<br /> well installed. Condor subsequently prepared a work plan for the destruction of MW-8 dated February 5,
<br /> 2003, destroyed MW-8 under SJCEHD permit and supervision on April 11, 2003, and prepared a report
<br /> of the well destruction dated April 21, 2003. Installation of a monitor well in the vicinity of former
<br /> monitor well MW-8 and a down-gradient monitor well will be conducted following development of the
<br /> property that the former MW-8 was located on. v
<br /> In accordance with SJCEHD requirements as described above, Condor did not sample MW-5, MW-6,
<br /> MW-7, MW-8 (destroyed), and MW-10 as part of the fourth quarter 2003 groundwater monitoring event
<br /> conducted on November 9, 2003. Monitor wells MW-5, MW-6, MW-7, and MW-10 were sampled,
<br /> however, as part of the annual monitoring event conducted on July 25, August 1, and August 4, 2003
<br /> (previous event). A summary of the results of the fourth quarter 2003 groundwater monitoring is provided
<br /> • in Table I on the following page.
<br /> ILA) CONDOR
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