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10 June 1999 <br /> AGE-NC Project No. 96-0229 <br /> Page 2 of 3 <br /> 4. Off-site thermal treatment; <br /> 5 . Asphalt reconstitution; <br /> 6. Off-site landfill disposal. <br /> The following is a brief summary of the relative feasibility and approximate costs of each <br /> treatment/disposal method: <br /> Natural Attenuation-Aeration, On-Site Enhanced Bio-Remediation or On-Site Thermal Treatment: <br /> • Natural attenuation, enhanced bioremediation and thermal treatment all require significant <br /> space to either spread the soil or set-up large treatment equipment. The site is presently an <br /> operating car wash and car detailing facility. All the `ton-site" methods would require <br /> significant space to spread the soil to achieve an effective treatment. The use of large <br /> portions of the property would create an economic hardship for the tenants. Furthermore, the <br /> property is surrounded by residential areas to the west, southwest and northwest, and air <br /> board approval of the on-site processes would not likely be granted. <br /> • The cost incurred for preparation of the soils for treatment, re-sampling and reporting is <br /> estimated between $20 (aeration) and $40 (thermal treatment) per ton. <br /> Off-site Thermal Treatment: <br /> • Off-site thermal treatment would not require additional space on-site. However, <br /> transportation of the soil to an off-site locality would be required. Disposal or resale of the <br /> treated soil would also require additional transportation of the soil. <br /> • The costs for transportation and off-site thermal treatment of the soil is estimated between <br /> $30 and $ 50 per ton. <br /> Asphalt Re-Constitution <br /> • According to representatives of George Reed Construction, Teichert Construction, and <br /> Granite Construction & Environmental, and consistent with AGE' S experience with treating <br /> or `re-using' soil with a high silt and clay content, such as that excavated from the site, is not <br /> practicable as such soil can not be used for finish or saleable asphalt. Therefore the impacted <br /> soil on the site can not be easily treated in a cost effective manner utilizing this remedial <br /> method. Only sand with a very low percentage of fines (silt and clay) can be used for <br /> Advanced GeoEnvirontnentsI, Inc. <br />