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Clayton <br /> EI IROWEN«I <br /> •] � COv5LL1av15 <br /> reanalyzed the sample from 4 feet bgs by the following methods to determine leaching <br /> potential of the constituents: <br /> .. EPA Method 801513550, for diesel fuel <br /> ..., Standard Method 5520F, 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 /> y — fuel, 280 ppm hydrocarbons, and 660 ppm oil and grease. The analytical report is <br /> y' 'J contained in Appendix D. <br /> ; Because the concentration of TRPH was 20 ppm at 4 feet bgs in the same borehole, , <br /> Clayton concluded, and the SJC/EHD concurred, that there is a low leaching potential <br /> for hydrocarbon constituents remaining in the soil. <br /> V- 5.2 MONITORING WELD AND DOMESTIC WATER WELL ABANDONMENT <br /> ��=M Monitoring well MW-3 was destroyed to approximately 10 feet bgs dunng soil <br /> f � i $$ excavation'activities. The well had been installed to a depth of 25 feet bgs. <br /> 0, „•t Approximately 15 feet of the well remained beneath,the backfill of the excavation pit. # <br /> MW: was over-drilled with a 10.1/2 inch auger to 25 feet, thus removingrany of the <br /> � <br /> L" by existingrwell+casing, screen, and filter pack, and was backfilled with neat grout to <br /> ' " and suilface. <br /> �V, <br /> 1 The domestic wi ter weir approximately 130 feet in depth, was�filled witivneat-grout <br /> usm&a tremie;hose'thEh4as exfeaded to the bottom of the well. The well-was Oiled <br /> from ttie�brittoni``to',approJa`mately;�3"feet below r ground�surface (bgs). The,top 3 feet <br /> of�thpL;iWeUl,was-excaviCc4,lthe-steel, casmg was cut, and the well,was capped with a <br /> + E � ,� neatAoout: <br /> < 5:3+, 0"ftRLV GROUNDWATER SAMPLING - JANUARY 1991 <br /> + r <br /> +Qrronnd"ter was-,sanipldd}from mbniton ng wells,MW 1, MW-2, and MW-3B on <br /> FJanu i5;#1991. I:aborato analyses-wefe>selected to assesstgroundwater for <br /> r t+ n ossibale cointaminat�oti from hezforiiier gasoluieand-septwtanks on the subject site. <br /> P <br /> KThe'` �unawater`sam les'firom tlieE <br /> ngro p three wells�weie analyzed by the following <br /> raech dI <br /> ��� * EPA lVlethOdK503U18015-8[n0,=for gasoline and $TEX. <br /> • EPA,Method 418.1, for TRPH <br /> None of these coin ands were detected in the samples that were analyzed. Table 3 <br /> � summarizes'analytncal results. <br /> 6.0 <br /> 4 �L% Based on the analytical results of the soil samples from the boring for MW-3B, <br /> Clayton recommended a limited, shallow soil sampling program to define the <br /> n 9 <br /> r � � xsoao>u.r <br /> 1 <br /> 1 <br />