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e . <br /> INEW <br /> 5.1 DISCUSSION OF RESULTS <br /> in the <br /> Total petroleum hydrocarbons as gasoline were <br /> TH Zly detewasctedlocated <br /> sample collected at 10 feet from soil boring <br /> at the base of the former tank cavity neAr the fill end of the <br /> tank. PID-readings indicated <br /> ing toe hehLUFT manual il actions and on thenot <br /> basisextend <br /> Of the <br /> fifteen feet. According <br /> Sol <br /> with concentrations of TPH as gasoline <br /> depth to groundwater, so <br /> less than 10 ppm can be left in place. <br /> TOGS PCE, and TCA were detected in the 15 foot samples from borings <br /> detected in the TH-6 <br /> TH-4 and TH-5. <br /> ReWista-oil co tiQuat ty tuen Controlt were trecomme ds that soil <br /> sample. <br /> The g m be mitigated. <br /> There <br /> with PCE concentrations in excess of 0.200 pp the general clean-up <br /> are no specific guidelines for TOG, however, <br /> PPM- <br /> target with this expected depth to groundwater is 100 ppm. <br /> 6.0 CON^ NCE.USIONS <br /> line tanks a In the vicinity ob former <br /> ganaso This impactionsmall is probably the <br /> soil has been impactedY <br /> Waste oil impacted soil extends o a <br /> result of overfill spillage. <br /> - depth less than 20 feet ned with <br /> to anrarea <br /> aghticylander with a t radius Of10 <br /> If the plume is confined acted soil is <br /> feet and a depth of 20 feet, tr.'_ volume of Impacted <br /> estimated to be approximately 230 cubic yards. <br /> 7.0 COMMENDATIONS <br /> vestihree <br /> Based <br /> upon the resultsrof es ntedsfoor the t o areas tof impacted soils <br /> courses of action are p and excavation with subsequent <br /> no action, excavation an <br /> disposal, <br /> - on-site treatment. <br /> The no action alternative is appropriate if the concentrations <br /> ronment the Sprescribed <br /> present a very low . isk to health and d ions envBecause of theshal ow <br /> by federal, state, and 1a g <br /> depth to groundwater, concentrations of gasoline and waste of <br /> constituents areoinrecommendf recommended levels. The no action <br /> alternative is n <br /> alleviate the on-site <br /> Impacted soil can be excavated to rapidly <br /> risk. The soil can either be transported off-ort f disposal or the <br /> with the excavation being backfilled with imp <br /> excavated soil can <br /> ant of treated <br /> che ogasalinendimpaa acted soil backfill could the <br /> treatment. Tre <br /> Completed in a short t time <br /> s by aeration <br /> rata n at low <br /> cost.hedTus ng nbiof <br /> the waste-oil imp approximately three <br /> remediation technology which could be completed app <br /> months after excavation. However, costs for this process for a <br /> n <br /> b:� v <br />