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1.0 INTRODUCTION <br /> As per Cleanup and Abatement Order No. 90-702, issued by the <br />' Regional Water Quality Control Board, Central Valley Region <br /> (CRWQCB) , SUN TECH ENVIRONMENTAL, INC. (SUN TECH) , has <br /> Performed Quarterly Monitoring for Mr. Jeff Werner, at the <br /> Geweke Land Development and Marketing (GLDM) property, <br />' located at 16 South Cherokee Lane, Lodi , California. <br /> This Quarterly Groundwater Monitoring Report has been <br />' prepared by SUN TECH, as required by the San Joaquin County <br /> Public Health Services, Environmental Health Division <br /> (SJEHD) . <br />' This report outlines the results of the groundwater sampling <br /> performed by SUN TECH on June 29 , 1992 at the above mentioned <br /> site. <br />' 1.1 SITE DESCRIPTION <br /> The subject property located at 16 South Cherokee Lane, Lodi , <br /> California, was once the site of a Gas-N-Save service <br />' 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 <br /> one 6,000 gallon fuel storage tanks were removed from the <br /> subject property in 1985. <br /> As required by the SJEHD, a subsurface site investigation was <br /> initiated at the subject property in 1985. Kleinfelder and <br /> Associates were retained to perform the investigation, and <br /> four monitoring wells were installed (MW-1, 2 , 3 and 4 ) to <br /> assess the subsurface conditions at the site (Figure 2 ) . <br />' The results of the investigation indicated that petroleum <br /> hydrocarbons were present in subsurface soils (concentration <br /> up to 214. 5 parts per million [ppm] TPH-Gasoline [TPH-G] , <br />' 7 . 67 ppm Benzene, 37 .9 ppm Toluene, 29. 9 ppm Ethylbenzene, <br /> and 11 ppm Xylenes) as well as groundwater (concentrations up <br /> to 46 . 2 ppm TPH-G, 0.74 ppm Benzene, 0. 624 ppm Toluene, and <br /> 1.75 ppm Xylenes) . <br /> f In February 1986, Brown and Caldwell (BC) , were retained by <br /> GLDM to further define the vertical and lateral extent of <br /> hydrocarbon contamination at the site. Five soil borings <br />' were drilled at this time (GL-1 through GL-5) . Petroleum <br /> hydrocarbons were not detected in GL-1 and GL-4 , however, <br /> low concentrations of hydrocarbon contamination was <br /> encountered in GL-5 (<25 ppm TPH-G, and <2 ppm Benzene, <br />' Toluene, Ethylbenzene, and Xylene) . Higher levels of <br /> hydrocarbon contamination was encountered in GL-2 and GL-3 <br /> (up to 240 ppm TPH-G, up to 10 ppm toluene, and up to 32 ppm <br /> xylenes) . (See Figure 2 for boring locations) . <br />' STE Project No. 4001 <br /> Page 1 <br />