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). H. KLEINFELDER & ASSOCIATES <br />1] <br />File: W-2028-1/13:340 <br />July 14, 1986 <br />Page 2 <br />o The collection of one soil sample from each boring at <br />approximately five feet below the tank bottom. <br />o The chemical analysis of the soil samples for total <br />hydrocarbons. <br />1 <br />IV. FIELD ACTIVITIES <br />' A. Soil Boring <br />' Boring B-1 was drilled 14 feet north of the center of the <br />tank at an angle of 46 degrees from horizontal. Boring B-2 <br />was drilled 14 feet south of the center of the tank at an <br />' angle of 44 degrees. The approximate locations of the soil <br />sample borings are shown on Plate No. 2. <br />During the drilling activity, a JHK&A geologist <br />classified the subsurface soils, collected soil samples, and <br />logged the boreholes. Descriptions of the soil encountered <br />are presented on Plate Nos. 4 and 5 with a copy of the <br />' Unified Soils Classification System (used to identify the <br />soil) included as Plate No. 3. The soils encountered in <br />boreholes B-1 and B-2 consisted of silt and sand. No free <br />' water was encountered during the drilling. Upon completion <br />of the drilling and soil sampling, the boreholes were <br />backfilled to the surface with a bentonite cement grout. <br />B. Soil S am pling Procedure <br />Soil samples were collected at the bottom of each <br />boring beneath the weed oil tank. The sampling intervals <br />are shown on Plates Nos. 4 and 5. Soil samples were <br />collected by advancing the boring to a point immediately <br />' above the sampling depth and then driving a Modified <br />California Sampler lined with three brass tubes into the <br />undisturbed soil. The sampler was removed from the bottom <br />Two soil borings were drilled on June 20, <br />1986. <br />The <br />t <br />borings were drilled using a truck -mounted Mobile <br />B-40 <br />drill <br />rig equipped with 6 -inch hollow stem augers. <br />' <br />The borings were started on a vacant lot on <br />the <br />east <br />side of the tank and angled back toward the tank. <br />The <br />weed <br />oil tank is 38 feet long and has a diameter of <br />7.5 <br />feet. <br />' Boring B-1 was drilled 14 feet north of the center of the <br />tank at an angle of 46 degrees from horizontal. Boring B-2 <br />was drilled 14 feet south of the center of the tank at an <br />' angle of 44 degrees. The approximate locations of the soil <br />sample borings are shown on Plate No. 2. <br />During the drilling activity, a JHK&A geologist <br />classified the subsurface soils, collected soil samples, and <br />logged the boreholes. Descriptions of the soil encountered <br />are presented on Plate Nos. 4 and 5 with a copy of the <br />' Unified Soils Classification System (used to identify the <br />soil) included as Plate No. 3. The soils encountered in <br />boreholes B-1 and B-2 consisted of silt and sand. No free <br />' water was encountered during the drilling. Upon completion <br />of the drilling and soil sampling, the boreholes were <br />backfilled to the surface with a bentonite cement grout. <br />B. Soil S am pling Procedure <br />Soil samples were collected at the bottom of each <br />boring beneath the weed oil tank. The sampling intervals <br />are shown on Plates Nos. 4 and 5. Soil samples were <br />collected by advancing the boring to a point immediately <br />' above the sampling depth and then driving a Modified <br />California Sampler lined with three brass tubes into the <br />undisturbed soil. The sampler was removed from the bottom <br />