ARCHIVED REPORTS_XR0012967 - Laserfiche WebLink

Home Browse Search

'05 October 1998 AGE-NC Project No. 98-0433 .Page 3 of 4 excavation of the six northern fuel dispensers,associated piping and excavation of apparently hydrocarbon-impacted soil for the upgrade of the fuel system. • On 15 September 1998, six laboratory-compo sited soil samples were collected from the "clean" soil in stockpile SP4 that was still remaining on the site. Low concentrations of diesel were detected in two of the.six samples,(see Table 2), other petroleum hydrocarbon analytes were not present in the samples at concentrations exceeding the method detection limits. Table 1 provides a summary of excavated soil volumes and current dispositions. Table 2 summarizes the 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 approving of any further soil disposal, the PHS-EHD has requested consideration and analysis of the feasibility of alternative methods 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-RenTediation or On-Site Thermal Treatment: Soil impacted by fuel hydrocarbons typically respond well to these treatment methodologies. Natural attenuation would require the greatest amount of time while thermal desorption would be require the least. Natural attenuation/aeration and on-site enhanced bio- rerimediation are generally cost effective methods of addressing large volumes of hydrocarbon-impacted soil,but may not beso cost effective for the volume of impacted soil currently stockpiled on the site. Of critical importance,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 treatment, requiring perhaps b to 12 months, would severely impact the business use of the 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 transportation costs, typically range, between $35 •and $55 per ton, depending upon. initial hydrocarbon' concentrations. This method of addressing the remaining stockpiled soil on the site-would involve minimal'disruption of the business use of the property. • Asphalt Re-Constitution: According•to representatives of George, Reed Construction, Teichert Construction, and Granite Construction& Environmental, only soil with very low Advanced GeoEn%•tronmental'Inc.