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N <br /> -� 3. PRESENT INVESTIGATION <br /> 3 . 1 SCOPE OF WORK <br /> On behalf of Exxon and at the recommendation of E. James of the <br /> Central Valley Region of the California Regional Water Quality <br /> Control Board, EA supervised the drilling of three additional <br /> soil borings at former Exxon RS 7-1050 on 10 and 11 July 1989 <br /> (SBS, SB6, SB7, Figure 6 ). The borings were used to collect soil <br /> f samples in the areas of the former <br /> tank Pit <br /> tank pit (SB6 and S87) <br /> and the former waste oil <br /> � — p t (SB5 ). <br /> The samples were analyzed for compounds as recommended in Table 2 <br /> -� of the Tri-Regional Board Staff Recommendations for underground <br /> r tank investigations. <br /> x I <br /> All monitoring wells were <br /> gauged and; where possible, sampled. <br /> t 1 <br /> In pursuit of closure for this site, the records of all sampling <br /> € have been reviewed and interpreted .and a Final R <br /> been proposed .for review by <br /> Remedial Plan has 1 <br /> the SJLHD and the RW CB <br /> Valley Region <br /> 3.2 DRILLING AND SAMPLING. OF <br /> 502E BORINGS . <br /> EA contracted Kvilhaug` Well i <br /> r. <br /> Dr" illing and Pump Csample, tno. <br /> to <br /> drill 1] a <br /> n <br /> de soil borings <br /> r <br /> .. <br /> using a Mobile Rig B-53 and 8 ' -inch <br /> jy hollow-steric augers. Borings were drilled to the top of the Batu- <br /> rated zone, which was at .57-58 feet <br /> ` on 10 July 1989. As the soil. <br /> borings were 'dr - - - - - <br /> _g, �31ed,-: undisturbed soil samples were collected at <br /> five-foot intervals with amodified Califprnia .split-spoon <br /> VA sampler: linedwith three 2-inch-diameter, 6-inch long buss <br /> liners; The sampler and brass liners were scrubbed uAbed with deter- <br /> g gent and rinsed with and deionized water before each sampling <br /> event. After collection of each sample, the exposed p ends cf 'one <br /> : L e25/71050/8-89/txt 12 <br /> y� <br />