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1 <br /> ,J <br /> F <br /> 16 August'2001 <br /> • AGE-NC Project No 97-0312 <br /> " Page 19 of 20 <br /> downward as much as 85 feet bsg (See Figures 12 through 18) The calculated volume of r <br /> hydrocarbon-impacted soil is approximately 10,000 cubic yards (Appendix C) The greatest <br /> contaminant concentrations in impacted soil are present at depths between surface grade and 25 feet, <br />' while lesser concentrations are present from surface gra&to 80 feet bsg <br /> The feasibility for soil excavation,bioremediation and natural attenuation to effectively address the <br /> impacted soil is low to uncertain AGE recommends that no further action be taken in regard to the <br /> remaining petroleum-impacted soil Soil remediation alternatives,estimated durations and associated <br /> costs for the site are summarized on Table 8 <br /> 9 2 REMEDIATION OF HYDROCARBON-IMPACTED GROUND WATER <br /> Petroleum hydrocarbon-impacted ground water associated with the unauthorized release appears to <br />' be limited to the area surrounding co-located monitoring wells UST-1 and UST-5 Intermittent <br /> detections of TPH-g, TPH-d and BTEX compounds have been reported in UST-2, UST-3, UST-4 <br /> and UST-6 Figures' 19, 20 and 21 depict the estimated extent of dissolved TPH-d, TPH-g and <br /> liebenzene in plan view The volume of hydrocarbon-impacted ground water can be approximated by <br /> utilizing an equation for an ellipsoid, the dimensnons,of the ellipsoid was estimated at a short radius <br /> of 48 feet,a long radius of 84 feet and an average thickness of approximatley 20 feet The calculated <br />' volume of hydrocarbon-impacted ground water is an estimated 241,000 gallons <br /> The fedsfbfhty-foi ground water extraction, bioremediation and natural dLtenuai10ri to effectively <br />' address the impacted ground water is low to uncertain AGE recommends that no further action be <br /> taken in regard to hydrocarbon-impacted ground waterGround water remediation alternatives, <br /> estimated durations and associated costs for the site are siummarized on Table 9 ' <br /> 3 <br /> , F , <br /> 10.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities The findings were based upon r <br />' review of reports prepared by a previous consultant and analytical results provided by an independent <br /> laboratory Evaluations of the geologic/hydrogeologic conditions at the site for the purpose of this <br /> I ,J <br /> 4 <br /> Advanced GeoEnvironmentai,Inc <br /> 1 <br /> 4 <br />