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� ...: gg---7T,--- <br /> I �i' Y G S <br />�} t t � r' z <br /> Lammersville school District <br /> 202/799--8221 <br /> July 28. 1987 <br /> SOIL BORING <br /> gid• _ <br /> The purpose of the! soil borings was to explore the site for <br /> the presence of subsurface hydrocarbon contamination , and to <br /> define the vertical and areal extent of the contamination found <br /> at the site. 1,11e soil borings were located within 30 yards of <br /> the tank pit excavation to comply with a request from the San <br /> Joaquin County Local Health District (see Figure 2, Site Plan ) <br /> - and were drilled with a truck mounted drill rig using 7 .5-Inch <br /> E <br /> G.D. (outside diameter) hollow stem augers . The drilling was <br /> performed under the direction of a Groundwater Technology , Inc . <br /> geologist who maintained a continuous log of the materials <br /> encountered (see Appendix I , Drill Logs) . <br /> 3 <br /> SOIL SAMPLES <br /> Soil samples were obtained during drilling using a 2.5-inch <br /> O.D. split spoon sampler lined with 2 inch by 6 inch brass sample <br /> tubes . The sampler was driven eighteen inches (ahead of the <br /> auger) at each sampling point . Samples were collected at 5 foot <br /> intervals beginning at 3 . 5 feet below ground surface to the <br /> bottom of the boring, where possible. The samples were preserved <br /> and transported under Chain-of-custody in accordance with <br /> Groundwater Technology , Inc . ' s Standard Operating Procedures <br /> (Sop' s) 11 , 14 , 15 and 19 (see Appendix II) . The samples were <br /> analyzed for total volatile hydrocarbons and benzene , toluene , <br /> ethylbenzene and xylene using EPA Methods 8020 and 8015. <br /> 6 <br />