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Y <br /> PROPOSED WORK PLAN PAGE 3 <br /> FORMER RULE ENTERPRISE PROPERTY JULY 29, 1988 <br /> TRACY, CALIFORNIA PR 88--55A <br /> A: . <br /> The investigation will itivolvedrilling approximately <br /> 20 borings down to depths extending to approximately 5 <br /> feet below grade . Soil samples from the borings will be <br /> collected for chemical analysis . Drilling will be <br /> conducted using hollow item flight auger drilling <br /> equipment . The augers and other equipment will be <br /> steamed cleaned prior to use and recleaned upon contact <br /> with on-site borings . <br /> B: Exploratory Fig1d Schedule <br /> AEL proposes to conduct the exploration phase of the <br /> project on August 8, 1968 . A state licensed drilling <br /> contractor familiar with hazardous waste investigation <br /> procedures will be utilized ) <br /> C: Sample CnIlac ion <br /> Using the hollow-stem flight auger drilling method, a <br /> retractable plug prevents soil from entering the auger <br /> flights during drilling. The plug is affixed to the <br /> lower end of a rod that fits within the hollow auger <br /> flights. When a target depth is reached the plug will <br /> be replaced by a Modified California Drive Sampler <br /> which is lowered to the bottom of the boring. The <br /> sampler is then driven into the soil for a distance of <br /> approximately 12 inches. The sampler will be driven by <br /> repeatedly raising a 140-pound hammer to a height of 18 <br /> inches and dropping it on the upper end of the rod <br /> until the sampler has advanced 12 inches. After driving <br /> is completed, the rod and sampler are retrieved from <br /> the boring and separated . The soil is removed from the <br /> sampler and prepared for shipment to an analytical <br /> laboratory. <br /> The Modified California Sampler consists of an outer <br /> sample barrel and an inner, thin-walled set of sieves. <br /> For this application, two S--inch long sleeves, placed <br /> end to end, will be used . As soil is forced into the <br /> sampler by the driving action described above, a soil <br /> sample will be collected ) in the rings . After removal <br /> from the boring and detachment from the rod, the <br /> sampler will be dismantled and the inner rings <br /> containing the soil sample removed . The lower ring will <br /> then be sealed by covering the ends with aluminum foil <br /> and securing the caps with duct tape . The sample will <br /> then be labeled and placed in cold storage until <br /> delivered to the analytical laboratory. To avoid <br />