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Work Plan for Environmental Investigation June 21, 1989 <br /> Waterfront Redevelopment, Stockton, California AGS 39048-1W <br /> 5030. In addition, the ground-water samples will be analyzed for <br /> volatile organics using EPA 624 with extraction as described for <br /> the 8240. Detection limits suitable for the tests requested and <br /> for concentrations present will be stated on the laboratory <br /> reports. Tests will be performed at a laboratory certified <br /> the State of California for the analyses requested. <br /> Gradient Calculations <br /> The ground-water gradient will be evaluated to provide an <br /> indication of the direction of ground-water flow at the site. <br /> The ground-water monitoring wells will be surveyed by a land <br /> surveyor licensed in the State of California to reference <br /> differences in elevation between the tops of the well casings to <br /> a known local benchmark, to within 0. 01-foot. Water-depth <br /> measurements will be taken in each onsite monitoring well with an <br /> electric water-level indicator. These data will be combined to <br /> evaluate the relative elevation of the ground-water surface in <br /> each well, the slope of the ground-water gradient, and the <br /> inferred direction of ground-water flow across the site. <br /> 18 <br /> Apjn/ied GeoSystemS <br />