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Y <br /> s'. <br /> fs .. <br /> r � <br /> 1 <br /> Jung 1, 1988 AGS Job No. 038032-2 <br /> UNOCAL Service Station No. 6981, Stockton, California <br /> LABORATORY ANALYSES <br /> Soil samples selected for testing will be analyzed by <br /> Environmental Protection Agency (EPA) Method 8015 (modified) for <br /> total petroleum hydrocarbons (TPH) and for the volatile <br /> hydrocarbon constituents benzene, ethylbenzene, toluene, and <br /> total xylene isomers (BETX) by EPA Method 8020. Water samples <br /> t will be inalyzed by EPA Method 602 for TPH and BETX, <br /> respectively. Detection limits suitable for the tests requested <br /> and concentrations present will be stated on the laboratory <br /> "ZI, report. The analyses will be performed by a laboratory certified <br /> by the State of California for these analyses. <br /> i <br /> } <br /> GRADIENT CALCULATIONS <br /> The ground-water gradient will be calculated to provide an <br /> indication of the direction of ground-water flow at the site. <br /> Measurements of elevation differences between tops of casing of <br /> the wells will be mads with of an automatic level. Water-depth <br /> measurements from the top of the casing will be made witn an <br /> electronic water-level indicator. These data will be combined to <br /> calculate the relative elevation of the ground-water surface in <br /> _.._.... <br /> ---- - —----- ------ <br /> i► <br /> 14 <br /> Awp1ivd Gd9oSyMms <br />