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Proposed Work Plan November 4 , 1988 <br /> U.S.A. Petroleum Station No. 65, Lodi, California AGS 87050-3 <br /> PROPOSED WORK <br /> �r <br /> The proposed investigation is designed to evaluate the degree and <br /> lateral extent of hydrocarbon contamination in ground water at <br /> the site. The following specific work elements are proposed: <br /> 1) Drill two offsite soil borings in the locations depicted on <br /> the attached Map of 'Proposed Monitoring Well Locations <br /> (Plate P-3) . Soil samples will be collected at 5-foot <br /> intervals during drilling. <br /> 2) Analyze selected soil samples for total petroleum <br /> hydrocarbons (TPH) , and the volatile hydrocarbon <br /> constituents benzene, ethylbenzene, toluene, and total <br /> xylene isomers (BETX) in a laboratory certified by the State <br /> of California. The soil sample collected immediately above <br /> the ground--water surface in each.boring will be analyzed. <br /> In addition, the soil sample with the highest reading on a <br /> portable organic vapor analyzer (OVA) will also be analyzed. <br /> If the sample collected above the ground-water interface is <br /> also the sample with the highest OVA reading, only that <br /> sample will be analyzed. <br /> 3) Install 2-inch-diameter monitoring wells in the offsite soil <br /> borings. The wells will extend approximately 20 feet below <br /> the ground-water surface (approximately 60 feet below <br /> existing grade) , if hydrogeologically feasible. The wells <br /> will be used to delimit the lateral extent of ground-water <br /> contamination. The proposed locations are subject to <br /> approval of an encroachment permit from the City of Lodi and <br /> approval by regulatory agencies. <br /> 4) Describe subsurface conditions at the site as revealed in <br /> the borings. <br /> 5) Develop the monitoring wells, and collect samples of ground <br /> water for laboratory analyses. Onsite monitoring wells will <br /> also be sampled. <br /> 6) Analyze the ground-water samples for TPH and BETX in a <br /> laboratory certified by the State of California. <br /> 5 <br /> App/led G&0SySM2MS <br />