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P Based on pr[ontlals analysisoscoreatofn 44 sestaCli sheslnthee fallowManual. ng a mximum leach aching po alloxahle concentration for BT%EE and 1PII wh lch can be left In place without - pnsing a threat to groundwater resources. . Benzene 0.3 ppm Teloene 0.3 ppm Fthylhenzane 1.0 ppm xylenes 1.0 ppm TPH as gasoline l00 ppm _As presented In Table 1,only samples collected from TBS in the northwest corner of the site produced gasoline constituent levels In excess of the LUFT Manual guidelines to a depth of between 29 and 25 Teet. ]n moral, the northwest portion will require farther Investigatl on. Samples collected from all other soil borings indicated non detectable petroleum hydrocarbon c centrations or - conc¢ntratlans orders of magnitude balow the LUFT Manual guidelines. ,he sdcond analyds in the LOFT Manual. the general risk appraisal, relies n gyeneralized enulronmental fate and chemistry date and some sl te-specific - lnformatlon. According to the LUFT Hanual_Instructions, the general risk appraisal is to be terminated at the depth there-constituents are non-detectable, -or below a IT or 0.3 ppm, Since all of the samples w3 ih the,axceptlon aF TBS have levels-below 0.3 ppm, the general tsk appraisal also indicates that the I itpacts of these traes residual BTXZ, and TPH concentrations remai ning in the soil do not pose a threat to the groundwater resourccs'cthe area. - 6,Z EVALUATION OF E%CAYATEO SOILS - As discussed -hove, based an the LIFT Manual leaching potential analysts erIond in Seetlon 5.1, the following maximum residual gasoline censtltupnt 4eye,s are alloxahle, and do-not pose a threat to tins groundwater resources of the area.- .-- . A•- Benzene 9.3 ppm - Toluene 0.3 Ppm - Ethylbenzene i.0 pGM, - I3 TPH as gasol'ya 100 pp. , 1 A presented in Section 2.2;-simples collected by BCA from the Farmer tank i.. excaYatian below a depth'of four feet Indicated on•detecta6le concentrations of BT%EE and TPN y/As illustrated in Table 3,all represental4v¢"Id':mples collected from tF.e excavated soil stockpile and the Btq drums indicateither - non detectable level,of petroleum hydrocarbons', or resldval levels which were orders aP magnitude less than marimum allowable concentrations. -The second aoalysls,the genera}risk appraisal;:was performed assuming that tha excavated soli"_could be used as backfl 11 material for the current open _