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. <br /> Proposed Work Plan November 4 , 1988 <br /> U. S .A. Petroleum Station No. 65, Lodi, California AGS 87050-3 <br /> Agency {EPA} Method 8015 and the volatile hydrocarbon <br /> constituents benzene, toluene, ethylbenzene, and total xylene <br /> isomers by EPA Methods 8020 for soil and 602 for water. <br /> Detection limits suitable for the matrix tests requested and <br /> concentrations present will be stated on the laboratory report. <br /> The samples will be analyzed using solvent extraction, gas <br /> chromatography separation, and photoionization and flame- <br /> ionization detection at Applied GeoSystems ' laboratory. This <br /> laboratory is certified by the State of California for these <br /> analyses. <br /> GRADIENT CALCULATIONS <br /> The ground-water gradient will be calculated to indicate the <br /> direction of ground-water flow at the site. Measurements of <br /> elevation differences between the tops of the well casings will <br /> be made by use of an automatic level. The water levels will be <br /> measured with an electronic water-level indicator. These data <br /> will be combined to calculate the relative elevation of the <br /> ground-water surface in each well and the slope of the <br /> potentiometric surface across the site. <br /> 12 <br /> Applied Geosysteins <br />