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1. H. KLEINFELDER & ASSOCIATES <br /> File: 24-2038-1/28:725 <br /> December 10, 1986 <br /> Page 2 <br /> ■ <br /> The scope of work included: <br /> • Drilling two soil borings and collecting soil samples. <br /> • Installing two—inch ground water monitoring wells in each soil <br /> .. boring. <br /> • Chemically analyzing selected soil samples for volatile <br /> aromatics (benzene, toluene, xylene) by EPA Method 8020, total <br /> petroleum hydrocarbons by GC—FID, ethylene dibromide, and total <br /> lead. <br /> • Developing the two monitoring wells and collecting water samples <br /> from each well. <br /> r • Chemically analyzing the water samples for volatile aromatics <br /> (benzene, toluene, xylene) by EPA Method 602 and total <br /> hydrocarbons by GC—FID. <br /> • Summarizing and presenting all field and analytical results in a <br /> final report. <br /> 5.0 FIELD ACTIVITIES <br /> 5.1 Drilling of Soil Borings <br /> Two soil borings were drilled on October 28 and 29, 1986, using a <br /> truck mounted Acker AD—II drill rig equipped with eight—inch hollow stem <br /> augers. Soil boring MW-1 was drilled on the west side of the underground <br /> tank, and soil boring MW-2 was drilled on the south side of the tank. Ms. <br /> Laurie Cotulla, of the San Joaquin Local Health District, assisted in the <br /> selection of the boring locations. The locations of the two soil borings <br /> and the underground storage tank are shown on Plate No. 2. Both borings <br /> were drilled to a depth of 59 feet below the ground surface. Ground water <br /> was encountered at a depth of 39 feet below the ground surface in the two <br /> borings. <br /> During the drilling, a JHK&A geologist classified the subsurface <br /> soils, collected soil samples, and logged the boreholes. Descriptions of <br /> the soils encountered are presented on Plate Nos. 4 and 5 with a copy of <br /> the Unified Soils Classification System (used to identify the soil) <br /> included as Plate No. 3. Plate Nos. 3 through 5 are included in Appendix <br /> A of this report. The soils encountered during drilling consisted of <br /> clayey silt, silt, silty sand, and sand. <br /> To minimize cross—contamination, all augers and associated equipment <br /> were steam cleaned prior to the drilling of each borehole. The sampling <br />