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Pacific Gas and Electric Company <br /> 202/799-5043 <br /> July 29 , 1988 <br /> Method 625, polychlorinated biphenyls (PCBs) by EPA <br /> Method 8080, bases and acids by EPA Method 8270, and <br /> triethylene glycol by a modified EPA Method 8015 . <br /> " Prepared this report containing the results of the <br /> investigation and recommendations regarding the <br /> feasibility of in situ bioremediation of soils con- <br /> taining elevated levels of petroleum hydrocarbons. <br /> SOIL BORINGS <br /> Three soil borings were drilled to examine the extent of <br /> petroleum hydrocarbons in subsurface soil near the sump. All <br /> three borings were drilled to a total depth of 12 . 5 feet below <br /> aground surface. <br /> Soil borings were drilled with a truck-mounted drill rig, <br /> using 7 . 0-inch outside diameter (O.D. ) hollow-stem augers . The <br /> drilling was supervised by a field geologist , working under the <br /> direction of a California Registered Geologist . The field <br /> geologist maintained a continuous log of the materials en- <br /> countered during drilling (Appendix I ) . <br /> SOIL SAMPLING <br /> Soil boring 1 (SB-1 ) was sampled continuously in order to <br /> maintain an accurate log of soils encountered. Soil borings 2 <br /> and 3 were sampled at 3-foot intervals, beginning approximately 3 <br /> feet below grade to the bottom of each boring. Samples were <br /> obtained during drilling using a 2 . 5-inch O.D. split-spoon <br /> sampler, lined with three 2-inch diameter by 6-inch long bass <br /> 5 <br />