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4 . 0 DRILLING SOIL BORINGS FOR THE INSTALLATION OF <br /> GROUNDWATER MONITORING WELLS AND PIEZOMETERS <br /> AND COLLECTING SAMPLES <br /> t4. 1, Permits <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 o f <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 In addition to the USA notification, Subtronic Corporation, a <br /> tprivate underground utility locating service, was contracted to pinpoint <br /> underground utility lines prior to drilling <br /> 4.'7 Drilling and soil sample collection <br />' Between March 6 and 9, 2000, Gregg Drilling of Martinez, California <br /> drilled soil borings P-1 through P-4 and MW-11 through MW-14 at the site <br /> using a Mobile B-61 drill rig equipped with 8-inch diameter hollow-stem <br /> augers (Figure 3) This drilling was directed by ASE senior geologist <br /> Robert E Kitay, R G On March 10, 2000, Gregg Drilling drilled soil <br /> borings P-5 and MW-15 using a limited access Rhino drill rig equipped <br />' with 8-inch diameter hollow-stem augers This drilling was directed by <br /> ASE associate geologist Ian T Reed Groundwater monitoring wells MW-11 <br />' through MW-15 were subsequently constructed in borings MW-11 through <br /> MW-15, and piezometers P-1 through P-5 were subsequently constructed <br /> in borings P-1 through P-5 <br /> During the drilling of soil borings MW-13 through MW-15 and P-1 through <br /> P-5, undisturbed soil samples were collected at vertical intervals of 2 5- <br /> feet as drilling progressed for lithologic and hydrogeologic description <br /> and for possible chemical analyses The samples were collected by driving <br />' a split-barrel drive sampler lined with 2-inch diameter brass tubes ahead <br /> of the auger tip with successive blows from a 140-1b hammer dropped <br /> 30-inches One tube from each sampling interval was immediately <br />' trimmed, sealed with Teflon tape, plastic end caps and duct tape, labeled, <br /> sealed in a plastic bag and stored on ice for transport to Kiff Analytical of <br /> Davis, California (FLAP 2236) under chain of custody Soil from the <br />' remaining tubes was described by the site geologist using the Unified Soil <br /> Classification System <br />' Franks One Stop Report - May 2000 <br /> -7- <br />