ARCHIVED REPORTS_XR0012636 CASE 1

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NIII dewatering activities associated with construction work in the vicinity of the site (personal communication with Mr. Harlin Knoll, SJCEHS and Mr. A. Banaal, Public Works Department, City of Tracy) . There are a number of existing wells in use vithin the City of Tracy, four of which are within a 1/2-mile radius of the site, as shown in Appendix A. These wells are used as observation, irrigation, and domestic wells. The Bureau of Reclamation supplies the City of Tracy with approximately half of its domestic water needs from the San Joaquin River and the Sacramento River through the Delta Mendota Canal. The remaining domestic water supply is provided by the City of Tracy through domestic ground water wells (personal communication with Mr. Derryl Scott, City of Tracy Public Utilities Department Laboratory) . 7.0 DISCUSSION OF RESULTS -- The results of field activities and laboratory analysis of the soil and ground water samples collected during this investigation and from previous investigations are discussed below. 7.1 Soil Analysis A total of four soil samples were collected from the four E soil borings for laboratory analysis. Results of the soil analysis are presented in Table 2 and discussed below. e Gasoline-range TPH was not detected in any of the t soil samples from the four additional borings. 9 BTE% constituents were not detected in the soil samples from Borings P-2, B-1, and B-2. However, the soil sample from P-1 had detectable levels of - benzene, toluene, and xylenes at 8 ppb, 13 ppb, and 19 ppb, respectively. 7.2 r2rg ad kZater Analysis Analytical results of all water samples collected from the monitoring wells are discussed below along with the results o� previous investigative work by KEI. Figures 6 and 7 show the TPH-G and benzene concentrations in the ground water, respectively, based on the recent sampling results. J : : 14