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� J <br /> ` SOIL SAMPLING <br /> Since the two tanks consist of one concrete vault with a concrete divider in the center (see <br /> Figure 3), one soil sample will be taken in the center beneath each end of the concrete <br /> vault. One soil sample will be taken beneath the sump. A total of three soil samples will be <br /> taken. Soil samples will be collected approximately 2 feet below the bottom of the tanks <br /> and sump in native soil. See Figures 4, 5 and 6 for specifics on sampling locations. <br /> The inclined boreholes will be drilled with a"Digger R"portable drill rig using hollow stem <br /> augers. Appendices D and E present drilling and environmental consultation applications <br /> filed with the SJLHD. Prior to commencing initial drilling operations, and subsequent to <br /> drilling additional boreholes, the drill rig, tools, hollow stem augers and any other downhole <br /> tools or equipment will be thoroughly steam cleaned to prevent borehole cross- <br /> contamination. Rinsate waters will be collected and stored onsite. All drill cuttings will be <br /> collected and stored onsite. A sample of the rinsate water, and a composite sample of the <br /> drill cuttings, will be collected and analyzed for the same chemical constituents as the soil <br /> samples collected. Final disposition of the rinsate waters and drill cuttings will be <br /> dependent on the chemical analyses conducted; either transport and disposal as hazardous <br /> wastes, or disposal of the rinsate waters into the storm drain system. Should the rinsate and <br /> drill cuttings be determined to be hazardous wastes, the accumulated rinsate and drill <br /> cuttings will be transported by a State of California licensed hazardous waste hauler <br /> (AEMC)under hazardous waste manifest to a TSD facility for disposal. <br /> Soil samples will be collected using a thin-walled Shelby Tube fitted with an internal brass <br /> liner. Soil samples will be collected in advance of the auger drill bit at the head of the <br /> hollow stem auger string. When the desired depth is reached, the Shelby Tube will be fitted <br /> with an internal brass liner and attached to the end of a string of drill pipe. The assembly <br /> will then be lowered through the hollow stem auger string. The Shelby Tube will then be <br /> pushed hydraulically in advance of the auger bit. The Shelby Tube will be advanced <br /> sufficiently so as to completely fill the brass liner with soil, and allow no headspace in the <br /> brass liner. The Shelby Tube will then be retrieved hydraulically. Following retrieval, the <br /> sample filled brass liner will be removed from the Shelby Tube. Both ends of the brass <br /> liner will be covered with aluminum foil, securely capped with polyethylene end caps, the <br /> „ �,� Page 4 <br />