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Drilling and Sampling Procedures <br /> The borings will be permitted through the San Joaquin County Public Health Services, <br /> Environmental Health Division. Locations will be cleared by Underground Service Alert (USA) <br /> prior to drilling. <br /> A truck-mounted drill rig equipped with 8-inch diameter hollow stem augers will be used to <br /> complete the boring. Soil samples will be collected using either a 2-inch I.D. Modified California <br /> sampler, a continuous core sample, or a standard penetration split-spoon sampler. Alternatively, <br /> some sampling may be performed using a Geoprobe system. Soils encountered during drilling will <br /> be classified by Harza staff by visual examination in the field in accordance with the Unified Soil <br /> Classification System. Boreholes will be backfilled with a bentonite-cement grout to the surface. <br /> Soil samples for chemical analysis will be collected in 2-inch diameter, 6-inch long brass tubes. If <br /> a Geoprobe is used, samples will be collected in 1-inch diameter, polyacrylic sample tubes cut to <br /> approximately 1-foot lengths. Sample tubes will be sealed with Teflon tape and plastic end-caps, <br /> labeled,and immediately placed in iced storage for transport to a state-certified analytical laboratory. <br /> A chain-of-custody form will be initiated in the field and accompany the samples. <br /> Ground water samples will be collected using a Teflon bailer. The bailer will be lowered into the <br /> open borehole and allowed to fill with water. The sample will then be decanted into appropriate <br /> containers, labeled,and placed in iced storage for transport to a state-certified analytical laboratory <br /> with accompanying chain-of-custody forms. <br /> Sampling equipment will be steam cleaned,or washed with a laboratory grade detergent and rinsed <br /> with distilled water before use and between samples to minimize cross-contamination. <br /> L067-H environ\ban_wp.sjc <br /> 9-14-95 1 <br />