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One Market Plaza <br /> Spear Street Tower, Suite 717 <br /> San Francisco,CA 94105 <br /> (415)957-9557 GEOMATAIX <br /> 14 March 1991 - <br /> Project 1781 <br /> MAR 1 8 <br /> ENVIRON Mi LEE ITA HIALTH <br /> Mr. Mark Sperling PERMIT/SERVICES <br /> ST Services <br /> 2941 Navy Drive <br /> Stockton, California <br /> Subject: Results of Soil Boring Program near Diesel Tank No. 13 <br /> 2941 Navy Drive <br /> Stockton, California <br /> Dear Mr. Sperling, <br /> This letter summarizes the results of the soil boring program conducted near diesel tank No. <br /> 13 on 17 January 1991. Seven borings were drilled by Spectrum Inc. of Stockton, <br /> California using a CME 55 drill rig outfitted with 6.5-inch hollow stem augers. Continuous <br /> cores of the borings were collected for lithologic description. The borings logs are <br /> presented as Attachment A. Soil samples were collected in plastic bags at approximate <br /> 2-foot intervals for analysis by thin layer chromatography (TLC), the semi-quantitative field <br /> analytical method that we discussed. Additional samples were collected in clean, <br /> 4-inch-long brass tubes and held for confirmation analyses by a state-certified analytical <br /> laboratory if deemed necessary when the TLC analyses were complete. In addition, one <br /> grab groundwater sample was collected from boring B-7. <br /> The groundwater sample from boring B-7 and two soil samples (collected from boring B-1 <br /> at 5 feet and boring B-6 at 8 feet) were selected for hydrocarbon characterization by <br /> Friedman and Bruya, Inc. of Seattle, Washington, a California-certified hazardous waste <br /> analytical laboratory. <br /> The approximate locations of the borings with respect to the diesel tank and valve system <br /> are presented on Figure 1. A summary of the TLC results are presented in Table 1. The <br /> laboratory reports from Friedman and Bruya, Inc. are included as Attachment B. <br /> The TLC results indicate that diesel is present in soil near the valve system of Diesel Tank <br /> No. 13 at concentrations that range from less than 100 parts per million (ppm) to greater <br /> than 10,000 ppm. The hydrocarbon characterization analyses of the soil and groundwater <br /> suggest that a least three different petroleum hydrocarbon products are present in the <br /> subsurface near the tank. The soil sample collected from Boring B-1, located near the valve <br /> Geomatrix Consultants, Inc. <br /> Consulting Engineers and Earth Scientists <br />