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_ • 05 October 199$ AGE-NC Project No. 9$-0433 Page 3 of 4 Table 1 provides a summary of excavated soil volumes and current dispositions. Table 2 summarizes results of laboratory analysis. Olympian Oil has proposed to dispose of the remaining impacted soil (approximately 150 cubic . yards)at Forward Landfill. However, prior to soil disposal the PHS-EHD has'requested feasibility options for treatment or dispose of hydrocarbon-impacted soil from the site. Therefore, AGE examined several remedial alternatives for the excavated soil. • Natural.Attenuation-Aeration, On-Site Enhanced Bio-Remediation or On-Site Thermal Treatment: Olympian Oil has indicated that there is no available space on the property to treat the impacted soil. Truck parking services are already inadequate and ex-situ treatmtent, requiring perhaps 6 to 12 months, would increase the hardship at the site. Although a cost- effective treatment method for larger volumes of soil, based upon the relatively small remaining volume of stockpiled soil, ex-situ methods do not appear to be feasible at the ; Jimco site. • Off-site Thermal Treatment: According to representatives of Granite Construction and Environmental, thermal treatment will require, transportation of the soil to an off-site treatment facility. Disposal or resale of the treated soil would then require additional transportation of the soil. Costs for off-site thermal treatment, including transporation costs, typically range between $35 and $55 per ton, depending upon initial hydrocarbon concentrations. - • Asphalt Re-Constitution: According to representatives of George Reed Construction, Teichert Construction, and Granite Construction,& Environmental, only soil with very low silt and clay content can be used for asphalt re-constitution. Although high sand content is present in stockpiled soils at the site (60%), it is likely that the amount of silts and clays (40%) would prohibit use of the impacted,soil for the production of asphalt. Cost for asphalt re-constitution typically ranges between $45 and $50 per ton. • Soil Disposal: Disposal of the impacted soil at Forward Landfill will involve costs for loading,transportation,disposal fees,and some analytical laboratory analyzes to characterize the soil. The work can proceed with minimal disruption to normal site activities and would provide the"fastest"method of soil disposition. Transportation and disposal at Forward, Inc. will cost between $20 and $25 per tori. Based upon cost and feasibility, AGE recommends disposal of the remaining impacted soil at Forward, Inc. This option will result in minimal disturbance to site operations and, based upon the small remaining volume (150 cubic yards), appears to be cost-effective. Advanced GeoEnvironmental,Inc.