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�- "%TC <br /> �r <br /> A S S O C I A T E S I N C . <br /> L <br /> 2.1 Soil Boring Advancement and Sampling <br /> �-+ Drilling activities at the site were performed by V & W Drilling (State C57 license no. 720904) <br /> in a phased approach utilizing two different drilling methodologies. The two soil borings in the <br /> vicinity of the former remote fill pipeline were advanced using a truck mounted Geoprobe0 rig <br /> `- employing direct push technology. The remaining borings were subsequently advanced using a <br /> truck-mounted drill rig equipped with 8-inch outside diameter hollow stem augers. <br /> Remote Fill Pipeline and Diesel Tanks <br /> On February 16, 1999, ATC supervised the advancement of two soil borings (SB 1 and SB2) in <br /> the vicinity of the former remote fill pipeline's fill-end. Drilling was performed by employing <br /> GeoprobeO method of direct push technology (DPT). <br /> Soil Borings SB 1 and S132 were completed at depths of 20 feet bgs. Soil boring SB 1 was <br /> advanced at an approximate angle of 30 degrees from vertical and boring SB2 was a vertical <br /> boring. Soil samples were collected from the two borings at four-foot intervals in acetate <br /> sampling tubes and were described according to the Unified Soil Classification System. The soil <br /> samples and drill cuttings were characterized for soil type, moisture content, and visual evidence <br /> 'wool of petroleum hydrocarbons. <br /> An FID was used as a field-screening device for the detection of petroleum hydrocarbon vapors <br /> in cored samples. Descriptions of soil types encountered and sample collection intervals are <br /> included on the boring logs contained in Appendix B. <br /> Following soil sample collection, the borings SBI and SB2 were backfilled with neat cement <br /> grout to the ground surface. <br /> Ir <br /> On February 23, 1999, ATC supervised the advancement of three soil borings (SB3, SB4, and <br /> S135) in the vicinity former diesel USTs. Drilling was conducted utilizing a hollow stem auger <br /> drill rig. Soil borings S133 through SB5 were advanced and sampled to 36.5 feet bgs. Soil <br /> samples were collected at five-foot intervals or significant changes in lithology, using a 2-inch <br /> F diameter split-spoon sampler containing three brass tubes. A field geologist logged drill cuttings <br /> L- and soil samples utilizing the Unified Soil Classification System. <br /> A flame ionization detection meter (FID) was used as a field-screening device for the detection <br /> ` of petroleum hydrocarbon vapors in drill cuttings and cored soil samples. Descriptions of soil <br /> types encountered and sample collection intervals are included on the boring logs contained in <br /> Appendix B. <br /> w:1172921repoM\sumwel.doc 3 <br /> V <br />