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Subsurface Investigation, Well Installation, and Sample Analyses Results Page 13 <br /> Cintra Park Phase II Development, <br /> Tract 2705, Tracy, California <br /> v July 23, 1998 CTE Job No. 20-0445B <br /> 4.6 Groundwater Elevation and Flow Direction <br /> Water-table elevations, from depth-to-water measurements collected prior to purging, are shown in <br /> FTable 3 and Figures 5 and 6. Based on the groundwater contour maps shown on Figures 5 and 6, <br /> Fthe direction of groundwater flow is to the northwest at a gradient of approximately 0.006 foot/foot. <br /> F <br /> 5.0 DISCUSSION OF RECENT RESULTS <br /> ., 5.1 Soil Sample Analyses Results <br /> As stated in Section 4.1, selected soil samples were an lyzed in the field using a combustible gas <br /> k , <br /> indicator (CGI), which monitored combustible gas concentrations (including petroleum <br /> w hydrocarbons) in parts-per-million (ppm). Observed CGI values were noted on the boring log <br /> (Appendix B); no values above 0 ppm were noted on any of the samples tested. <br /> r- <br /> Evaluation of soil sample analyses results for TPH-Gas and BTEX results (Figures 4 and 5, and <br /> r <br /> Table 1) show that the only constituent observed above the laboratory reporting limit was toluene. <br /> TPH-G,benzene, ethylbenzene, and xylene were all below the laboratory reporting limit. Toluene <br /> was observed at selected intervals in each of the soil borings. Detectable toluene concentrations <br /> f ranged from 0.007 mg/kg (PMW-2, 20.5-21.0 and PMW-3, 10.5-11.0) to 0.030 mg/kg (PMW-1, <br /> 12.5-13.0). <br /> CATEEL FILEWINTRA PARKICINTRA7-13.DOC <br /> F + <br />