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1 _ <br /> STE Project No. 4001-001 <br /> Page 1 <br />' 1.0 INTRODUCTION <br /> In accordance with Monitoring and Reporting Program No. <br /> 93-701, issued by the Regional Water Quality Control Board, <br />' Central Valley Region (Regional Board) , SUN TECH <br /> ENVIRONMENTAL, INC. (SUN TECH) , has performed Groundwater <br /> Monitoring for Mr. Jeff Werner, at the Geweke Land <br /> Development and Marketing (GLDM) property, located at 16 <br />' South Cherokee Lane, Lodi, California. <br /> This Groundwater Monitoring Report has been prepared by SUN <br />' TECH, as required by the San Joaquin County Public Health <br /> Services, Environmental Health Division (County) . <br /> This report outlines the results of the groundwater sampling <br />' performed by SUN TECH on March 1 , 1993 and March 9 , 1993 , at <br /> the above mentioned 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 /> f 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 Regional Board, a subsurface site <br /> investigation was initiated at the subject property in 1985 . <br /> Kleinfelder and Associates were retained to perform the <br /> investigation, and four monitoring wells were installed (MW- <br /> 1, 2 , 3 and 4 ) to assess the subsurface conditions at the <br /> 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 />' 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 />