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1 <br /> 1 <br /> 1 <br /> 1.0 INTRODUCTION <br /> In accordance with Monitoring and Reporting Program No. 93-701, issued by the <br />' Regional Water Quality Control Board, Central Valley Region (Regional Board), Sun <br /> Tech Environmental, Inc. (Sun Tech), has performed Groundwater Monitoring for Mr. <br /> Jeff Werner, at the Geweke Land Development and Marketing (GLDM) property, <br />' located at 16 South Cherokee Lane, Lodi, California. <br /> This Groundwater Monitoring Report has been prepared by Sun Tech, as required by <br />' the San Joaquin County Public Health Services, Environmental Health Division <br /> (County). <br />' This report outlines the results of the groundwater sampling performed by Sun Tech on <br /> June 30, 1993, at the above referenced site. <br />' 1.1 SITE DESCRIPTION <br />' The subject property located at 16 South Cherokee Lane, Lodi, California, was once <br /> the site of a Gas-N-Save service station, but is currently the location of the Geweke Car <br /> Capitol, a used car dealership (Figures 1 and 2). <br /> 1.2 PREVIOUS WORK <br /> One 1,000 gallon waste oil tank, and two 10,000 gallon, and one 6,000 gallon fuel <br />' storage tanks were removed from the subject property in 1985. <br /> As required by the Regional Board, a subsurface site investigation was initiated at the <br />' subject property in 1985. Kleinfelder and Associates were retained to perform the <br /> investigation, and four monitoring wells were installed (MW- 1, 2, 3 and 4) to assess <br /> the subsurface conditions at the site (Figure 2). <br /> The results of the investigation indicated that petroleum hydrocarbons were present in <br /> subsurface soils (concentration up to 214.5 parts per million [ppm] TPH-Gasoline <br />' [TPH-G], 7.67 ppm Benzene, 37.9 ppm Toluene, 29.9 ppm Ethylbenzene, and 11 ppm <br /> Xylenes) as well as groundwater (concentrations up to 46.2 ppm TPH-G, 0.74 ppm j <br /> Benzene, 0.624 ppm Toluene, and 1.75 ppm Xylenes). <br />' In February 1986, Brown and Caldwell (BC), were retained by GLDM to further define <br /> the vertical and lateral extent of hydrocarbon contamination at the site. Five soil <br />' borings were drilled at this time (GLA through GL-5). Petroleum hydrocarbons were <br /> not detected in GL--1 and GL-4, however, low concentrations of hydrocarbon <br /> contamination was encountered in GL-5 (<25 ppm TPH-G, and <2 ppm Benzene, <br /> 1 <br />