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To collect samples using the split-spoon sampler, the sampler is initially lowered to the <br /> bottom of the soil boring and driven 6 inches into undisturbed soil. It is then driven 12 <br /> inches deeper by repeatedly dropping a 140-pound weight from a height of 30 inches. The <br /> number of blows required to advance the sampler 12 inches is recorded on the boring logs <br /> as "blows per foot". This information is used in estimating soil density. <br /> Soil descriptions, including consistency, moisture, particle size, and color,and other relevant <br /> observations will be recorded on soil boring logs. Soils will be classified in general <br /> accordance with the Unified Soil Classification System (USCS) or the American Society for <br /> Testing and Materials (ASTM) standards. <br /> The soil borings may be completed as groundwater monitoring wells, or abandoned by <br /> grouting with a 6-sack cement slurry containing 3 to 5 percent bentonite or by backfilling <br /> with bentonite chips. Abandonment procedures will depend upon the boring depth, depth <br /> to groundwater, project objectives, and regulatory requirements. For borings greater than <br /> 15 feet deep, grout will be emplaced through the hollow augers which will extend to within <br /> 15 feet of the bottom of the boring. If required by the local regulatory agency, grout will <br /> be emplaced by pumping through a tremie pipe which extends to within 15 feet of the <br /> bottom of the boring. The tremie pipe or augers are withdrawn from the boring in 5-foot <br /> increments as the boring fills with grout. SOPS for groundwater monitoring well installation <br /> are described in a separate document. <br /> Soil cuttings generated during drilling will be containerized in Department of <br /> Transportation-approved drums, or placed on and covered with plastic sheeting, and stored <br /> on site in an area inaccessible to the general public. Typically, the stockpiled soil is <br /> characterized by collecting and analyzing composite samples from the stockpile. Twining <br /> can recommend an appropriate method for disposition of the cuttings based on the <br /> analytical results. Disposal will be the responsibility of the client. <br />