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ENVIRONMENTAL HEALTH DEPARTMENT <br />Donna K. Heran, R.E.H.S. <br />Director <br />Al Olsen, R.E.H.S. <br />Program Manager <br />Laurie A. Cotulla, R.E.H.S. <br />Prograr'n Manager <br />SAN JOAQUIN COUNTY <br />304 East Weber Avenue, Third Floor <br />Stockton, California 95202-2708 <br />Telephone: (209) 468-3420 <br />Fax: (209) 464-0138 <br />Unit Supervisors <br />Carl Borgman, R.E.H.S. <br />Mike Huggins, R.E.H.S., R.D.I. <br />Douglas W. Wilson, R.E.H.S. <br />Margaret Lagorio, R.E.H.S. <br />Robert McClellon, R.E.H.S. <br />Mark Barcellos, R.E.H.S. <br />GURPAL S. SIDHU <br /> OCT 2 7 2004 <br />5410 STAPLES WAY <br />LINDEN CA 95236-9556 <br />RE: 3032 East Waterloo Road, Stockton Site Code: 1758 <br />San Joaquin County Environmental Health Department (EHD) is the lead agency <br />providing the oversight of the investigation and cleanup of releases from <br />underground storage tanks (USTs) within San Joaquin County. EHD has a <br />contract with the California State Water Resources Control Board to conduct a <br />UST corrective action program. The above-referenced site was placed in the <br />EHD Local Oversight Program (LOP) in February 1999. <br />The lateral and vertical extent of soil and groundwater contamination has not <br />been defined at your site. In a letter dated September 24, 2003, EHD gave you a <br />directive to submit a Work Plan (WP) to define the vertical and lateral extent of <br />soil and groundwater contamination. To date, eight Monitoring Wells (MW) and <br />four Groundwater Extraction Wells (EX) have been installed. Numerous off-site <br />borings have been completed and soil and groundwater samples collected for <br />laboratory analysis. <br />An interim remediation system is currently in operation at your site. Groundwater <br />is being extracted from four wells, treated, and disposed of to the public sewer. <br />Free phase gasoline is still evident in extracted groundwater. Contaminated soil <br />associated with the unauthorized release is not being treated with the interim <br />remediation system. Further soil investigation will be required to determine the <br />full extent of contamination. Feasibility testing for remediation of vadose zone <br />contaminated soil in the UST/source area should be proposed and performed to <br />start reducing contaminant mass potentially impacting groundwater. <br />A Site Assessment Work Plan (WP) dated December 2, 2003 was prepared by <br />Advanced GeoEnvironmental (AGE) and submitted to EHD. The WP proposed <br />to complete 4 additional borings off-site to collect groundwater samples. The WP <br />does not address the vertical extent of the soil and groundwater contamination in <br />the source area on-site. Groundwater contamination has been documented at <br />185 feet below ground surface (bgs) in MW #7.