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Section 5. Field Procedures <br /> L. <br /> 5.1. BORING ADVANCEMENT <br /> Forty eight soil borings will be advanced into the subsurface using DPT equipment at locations identified <br /> on Figure 2. The soil borings will be drilled one foot deeper than the top of the water table (11 feet bgs) <br /> to a total depth of approximately 12 feet bgs. Four-point composite soil samples and discrete soil samples <br /> will be collected from soil borings for laboratory analyses. The DPT sampling equipment consists of a <br /> three-foot-long two-inch drive casing with an inner sample barrel with an inner sample sleeve (acetate <br /> liner). These components are simultaneously hammered into the subsurface at three-foot intervals. After <br /> advancing three feet,the sample barrel and acetate liner are retrieved while the drive casing remains in the <br /> ground. The sample barrel with a new acetate sleeve is then placed back into the drive casing and driven <br /> three additional feet. The soil sample is collected at the appropriate intervals from the core contained in <br /> the acetate sleeve. <br /> 5.1.1. Decontamination <br /> Prior to mobilization, the DPT rig and associated sampling equipment will be decontaminated. Once at <br /> the site, the DPT rig will be decontaminated between boring locations. All rinsates, liquid spray, soil, <br /> debris, and other decontamination wastes will be fully contained, characterized and disposed of <br /> appropriately. <br /> The minimum steps for decontamination are as follows: <br /> ■ Appropriate personal protective equipment (as specified in the project work plans) will be worn <br /> by all personnel performing decontamination,in order to limit worker exposure. <br /> ■ Equipment caked with drill cuttings, soil, or other material will be initially scraped or brushed. <br /> The scrapings will be containerized and appropriately disposed of. <br /> ■ Equipment will be rinsed with potable water. <br /> IN During the decontamination effort, fluid systems should be routinely inspected for any leaks or <br /> problems, which may potentially result in an inadvertent release at the site, thereby contributing <br /> to the volume of waste or contamination. Any identified problems should be repaired <br /> immediately and documented on the appropriate form(s). <br /> kon-fs0ltprojects\2008_ProlectsQ8-078 City of Stockton Soil Fxci valionZ.OnginalsZannpling and Analysis Plan\Stockton_SAP_Diall_062608_bb.d.c "" <br /> 5-1 <br /> ERRG <br />