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XMIN WWE�W N-05 AN, <br /> -ANY <br /> 3" tzr ,pY <br /> �'.' - •{ ., - - w sol <br /> TO <br /> 9,Win a <br /> 1, <br /> h <br /> hLe . <br /> L <br /> Exxon Company OSA <br /> t ; 202/225-2745.02 <br /> August 21 , 1987 <br /> SOIL BORINGS <br /> The purpose of the soil borings, which were subsequently <br /> converted to monitoring wells , was to explore the site for the <br /> presence of subsurface hydrocarbons, and to further define the <br /> vertical and areal extent of the contamination previously found <br /> on the site . The borings for monitoring wells 4 and 5 were <br /> located on the southeastern and northern r <br /> - Y property boundaries {see ! <br /> Figure . 2 , Site Plan) to comply with a request from the San. <br /> t Joaquin County Local Health District. Both borings were drilled <br /> = with a truck mounted drill rig using 10 . 5 inch. O.D. (outside <br /> diameter) hollow stem augers . The drilling� g was performed under <br /> a the direction of a Groundwater Technology geologist who also <br /> maintained 'a continuous log of the materials encountered (see <br /> Appendix F , Drill Logs) . <br /> - 2 <br /> SOIL SAMPLES <br /> R ? Soil samples were obtained during drilling using a 2.5-inch <br /> rk <br /> 0 -D . split spoon sampler lined with three 2 inch by 6. inch <br /> brass sample tubes. The sampler was driven eighteen inches ahead -i <br /> . ; of the augers at each sampling point . SampAes were collected at <br /> five foot intervals from . a depth of 5 feet below ground surface <br /> �f � •. to - the .bottom of each. boring. The samples were sealed, capped, <br /> labeled and stored on Ice for transportation to the laboratory <br /> under Chain- of=Custody in accordance with GTI ' s Standard <br /> w� <br /> r <br /> Operating Procedures (SOP ' $ ) 11 . 14, 15 and 19 (see Appendix <br /> ThE}- samples were analyzed for TVH and eTEX using Modified F <br /> t EPA `Met'aod 5030/8020/8015. <br /> F <br /> 6 _ <br />