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05 July 2001 <br /> AGE-NC Project No. 97-0327 <br /> Page 2 of 3 <br /> 1. Natural Attenuation (on-site aeration); <br /> 2. Enhanced ex-situ bioremediation; <br /> 3. On-site thermal treatment; <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 of each treatment/disposal method: <br /> Natural Attenuation-Aeration, Orr-Site Enhanced Bio-Remediation or Ora-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 <br /> utilized for retail fueling. All the"on-site"methods would require significant space to spread <br /> the soil to achieve an effective treatment. However, the use of large portions of the property <br /> would create an economic hardship for the tenants. Furthermore, the property is surrounded <br /> by residential areas to the south and west and a high school to the southeast; therefore, air <br /> board approval of the on-site processes would not likely be granted. <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 /> Asphalt Re-Constitution: <br /> • According to representatives of George Reed Construction, Teichert Construction, and <br /> Granite Construction & Enviroivrl.ental, 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 he used for <br /> production of construction-grade asphalt. <br /> Advanced GeoEnvirronntental,Inc. <br />