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WEISS ASSOCIATES <br /> 1. INTRODUCTION <br /> This report presents the results of the soil boring and sampling performed in December <br /> 1988 by Weiss Associates (WA)at the Diamond Walnut Growers(DWG) walnut processing plant <br /> at 1050 South Diamond Street in Stockton, California (Figure 1). The objective of the <br /> investigation was to determine the integrity of five underground chemical storage tanks at the <br /> site by collecting soil samples from borings drilled beneath the tanks and analyzing the <br /> samples for chemicals stored in the tanks. <br /> I.I. SCOPE OF WORK <br /> Our scope of work included: <br /> 1) Drill ten soil borings beneath the five chemical storage tanks and collect soil <br /> samples for lithologic description and for possible chemical analysis. <br /> 2) Survey the samples from beneath Tanks 1, 5 and 6 in the field with an Organic <br /> Vapor Analyzer (OVA). <br /> 3) Drill two soil borings in uncontaminated native soil and collect soil samples to <br /> determine background soil conditions. <br /> 4) Backfill the borings with cement grout. <br /> 5) Select samples from beneath Tanks 1, 5 and 6 for propylene/ethylene glycol <br /> analysis, based on the OVA measurements and field observations. <br /> 6) Select samples from beneath Tanks 7 and 8 and the background samples for <br /> chromium, hexavalent chromium, copper, sodium, calcium, sulfate and chloride <br /> analyses based on field observations. <br /> 7) Report the results. <br /> The site background and the results of each of these tasks are outlined below. <br /> Recommendations for additional investigation are presented in a separate letter. <br /> 1.2. BACKGROUND <br /> The DWG walnut processing plant is located northeast of the intersection of Chartcr <br /> Way and South Walnut Street in Stockton, California (Figure 1). According to DWG, the plant <br /> F:\ALL\331DWG\331L1FE9.WP Page 1 <br />