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Clayton , <br /> . E\CARO\tEtTiE <br /> CgASL'LTA\TS <br /> �`. reanalyzed the sample from 4 feet bgs by the Following methods to determine leaching <br /> potential of the constituents; <br /> • EPA Method 8015,3550, for diesel Fuel <br /> • Standard Method 552OF, for hydrocarbons <br /> • Standard Method 5520E, for total oil and grease <br /> These analyses revealed the following hydrocarbon fractions in the soil: 3 ppm diesel <br /> fucl, 280 ppn1 hydrocarbons, and 660 ppm oil and grease. The analytical report is <br /> contained in Appendix D. <br /> Because the concentration of TRPH was 20 ppm at 9 feet bgs in the same borehole, <br /> Clayton concluded, and the SJC/EHD concurred, that there is a low leaching potent <br /> for hydrocarbon constituents remaining in the soil. <br /> s.v <br /> 5.2 MONITORING WELL AND DOMESTIC WATER WELL ABANDONMENT <br /> Monitoring well MW-3 was destroyed to approximately 10 feet bgs during soil <br /> I _ excavation activities, The well had been installed to a depth of 25 feet bgs. <br /> Approximately 15'feet of the well remained beneath the backfill of the excavation pit, <br /> r-' MW-3 was over-drilled with a 10-1/2 inch auger to 25 feet, thus removing any of the <br /> existing well casing, screen, and filter pack, and was backfilled with neat grout to <br /> ground surface. <br /> The domestic water well, approximately 130 feet in depth, was filled with neat grout <br /> using a tremie hose that was extended to the bottom of the well. The well was filled <br /> from the bottom to approximately 3 feel` below ground surface (bgs). The top 3 feet <br /> s of the well was excavated, the steel casir;g was cut, and the <br /> neat out. well was capped with a <br /> ims <br /> r4F 5.3 QUA.RTERLF GROUNDWATER 3A11v1,PLING - JANUARY 1991 <br /> Groundwater was sampled from monitorings*cell <br /> January 15, 1991. Labs MW-1, MW-2, and MW-3B on <br /> oratory analyses were selected to assess groundwater for <br /> rte possible contamination from the former asa:!` <br /> The groundwater samples from the three weVs lwand <br /> edanseptic <br /> yzed by the foIlawing on the subject site. <br /> �,. methods: <br /> • EPA Method 5030/8015-8020, For gasoline and BTEX. <br /> EPA Method 418.1, for TRPH <br /> None of these compounds were detected in the samples that were analyzed. Table 3 <br /> ' summarizes analytical results. <br /> 6.0 <br /> MIGA -R <br /> SA&ellNG <br /> Based on the analytical results of the soil samples from the baring for MW-3B, <br /> Clayton recommended a limited, shallow soil sampling program to define the <br /> 9 <br /> E 345004Lmp <br />