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Subsurface Investigation 315 Enterprise Place <br /> January 13, 2000 Tracy, California <br /> EPA Method 8020 (602 for water <br /> Analyses were performed by Excelchem Laboratories of Roseville, California. <br /> Results of analyses are summarized in Table 1, and copies of the reports are attached. <br /> 2.1 Additional Trenching <br /> On November 24, 1999, Lush Geosciences, Inc. excavated eight additional trenches <br /> (Figure 2) to a maximum depth of approximately 10 ft to assess soil and groundwater <br /> conditions at the site. The trenches were excavated in location north, south, and east of the <br /> initial trench and were located to provide data regarding the lateral extent of contamination. <br /> Soil samples were collected from the backhoe bucket by driving clean brass sleeves <br /> into relatively undisturbed soil in the backhoe bucket. The sleeves were then sealed with <br /> aluminum foil, plastic caps, and airtight tape. The sampled soil came from depths of 10 ft <br /> and 1 i ft, and corresponded to discolored zones in native soil with a diesel odor or at depths <br /> equivalent to that zone in areas where no contamination was apparent. Groundwater was <br /> encountered at a depth of 9 to 10 ft. A water sample was collected from the backhoe bucket <br /> in two of the locations, T5, to the east of the former tank, and T8, at this southern-most limit <br /> of exploration. <br /> Soil samples from the excavations were analyzed for total petroleum hydrocarbons as <br /> diesel (TPHd) total petroleum hydrocarbons as gasoline (TPHg)using EPA Method 8015 and <br /> .y <br /> for the volatile fuel constituents benzene,toluene, ethylbenzene, and xylenes (BTEX) using <br /> EPA Method 8020 (602 for water). <br /> Analyses were performed by Excelchem Laboratories of Roseville, California. <br /> Results of analyses are summarized in Table 1, and copies of the reports are attached. <br /> 9015-025 -2- <br />