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y <br /> JulianMunoz wr+sSAs.SOCIATES <br /> February 10, 1988 6 <br /> CONCLUSIONS <br /> Samples of native soil collected from the southwestern corner of the <br /> excavation and the composite sample of pea gravel from the northern side of <br /> the excavation contain concentrations above WQCB-CVR guidelines for <br /> allowing the material to remain in place untreated. Samples from the eastern <br /> wall and the southeastern corner of the excavation contained no detectable <br /> hydrocarbons. <br /> As detailed in WA reports dated 10 June and 15 October 1987, a total of <br /> 17 soil samples from 12 borings drilled adjacent to the tank pit were analyzed <br /> in the laboratory for TFHC prior to the tank excavation sampling described <br /> only one t.iken at a depth of 20.7 feet from boring <br /> above. Of these samples, <br /> he excavationcontained <br /> B-2, adjacent to the southwestern corner of t , <br /> It therefore appears that detectable hydrocarbons <br /> detectabele hydrocarbons. <br /> in native soil are restricted to the southwest corner of the excavation. <br /> 1 <br /> PROPOSAL FOR FINAL. EXCAVATION CLOSURE <br /> Based on the results of the 22 and 23 January 1988 sampling and the <br /> results reported on 10 June and 15 October 1987, we recommend the following: <br /> 1) Support or temporarily remove the water lines along the northern side <br /> of the excavation and then remove the remainder of the pea gravel <br /> and stockpile it on the impermeable liner; <br /> 2) Remove soil from a few feet north of the sample TP-N-6 location to a <br /> few feet east of the sample TP-N-5 location in the southwest corner <br /> and along the northern side of the excavation. Along both the <br /> southwest corner and the nothern side determine the limits of <br /> from---te-existin ka11s._and._down..from the <br /> excavation la.eral away <br /> Services in <br /> floor by analyzing soil samples at Canonie Environmental <br />