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4 . 0 DRILLING SOIL BORINGS AND COLLECTING SOIL SAMPLES <br /> Prior to drilling, ASE obtained a drilling permit from the San Joaquin <br /> County PHS-EHD ASE also obtained an encroachment permit from the <br /> City of Manteca to allow for drilling in the city right of way Copies of <br /> these permits are located in Appendix B Underground Service Alert <br /> (USA) was notified to have underground public utilities marked in the site <br /> vicinity <br /> 4_.2 CPT Drilling <br /> On September 6, 2000, Gregg In-Situ of Martinez, California drilled soil <br /> borings CPT-15 and CPT-16 at the site using a CPT direct push drill rig <br /> (Figure 3) The purpose of these borings was to determine the lithology at <br /> each location to assist in the design of groundwater monitoring wells to <br /> be installed in these locations ASE senior geologist Robert E Kitay, R G <br /> directed the drilling Boring CPT-15 was located across West Yosemite <br /> Avenue (downgradient) of the site near monitoring well MW-13 This <br /> boring was drilled to a total depth of 140-feet bgs Boring CPT-16 was <br /> drilled near the eastern edge of the site This boring was drilled to a <br /> depth of 128-feet bgs The total depth of these borings was based on the <br /> lithology of the sediment encountered during the drilling At the <br /> completion of the drilling, the borings were backfilled with neat cement <br /> using a tremie pipe in boring CPT-15 and retraction grouting in boring <br /> CPT-16 A report explaining the CPT procedures and presenting the CPT <br /> logs and test results is presented in Appendix C <br /> 4-3 Drilling and soil samnle._collection <br /> Between September 11 and 15, 2000, Gregg Drilling of Martinez, <br /> California drilled soil borings MW-16 through MW-18 at the site using a <br /> Mobile B-61 drill rig equipped with 8-inch diameter hollow-stem augers <br /> (Figure 3) Soil borings MW-19 and MW-20, along with recovery wells <br /> RW-1 and RW-3, were drilled using a limited-access Rhino drill rig <br /> equipped with 8-inch diameter hollow-stem augers This drilling was <br />' directed by ASE senior geologist Robert E Kitay, R G and ASE associate <br /> geologist Ian Reed Groundwater monitoring wells MW-16 through <br /> MW-20, and recovery wells RW-I and RW-3, were subsequently <br /> constructed in these borings <br /> Franks One Stop Report — November 2000 <br /> -9- <br />