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5 <br /> Subsurface Investigation, Well Installation, and Sample Analyses Results Page 8 <br /> Cintra Park Phase II Development, <br /> Tract 2705, Tracy, California <br /> F July 23, 1998 CTE Job No. 20-0445B <br /> FRecords are included in Appendix C. Archive samples not immediately scheduled for analysis were <br /> stored in a refrigerator at the CTE office in Tracy, California. <br /> F <br /> Selected soil samples were also analyzed in the field using a combustible gas indicator(CGI), which <br /> monitored combustible gas concentrations in parts-per-million(ppm). Observed CGI values were <br /> noted on the boring log (Appendix B); no values above 0 ppm were noted on any of the samples <br /> rtested. <br /> F <br /> 4.2 Site Geology <br /> FLithologic units underlying the site observed in the recent boring/well installations are generally <br /> Fconsistent with previous reports (Hallenbeck & Associates, 1995; CTE, 1997). Based on these <br /> recent observations, site soils/sediments were divided into three units: 1) engineered fill, 2) <br /> excavation backfill, and 3) Quaternary alluvium (Figures 4 and 5). <br /> r <br /> F4.2.1 Engineered Fill <br /> Engineered fill soils were observed to a depth of approximately five feet in all <br /> boreholes/wells. These soils consisted of silty clay to clayey sand with trace gravel and <br /> Fconcrete chunks. These soils were placed durin grading activities at the site in 1997-1998. <br /> F'" <br /> F C:1TEEL FILFSICINTRA PARKICINTRA7-13.DOC <br />