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f 25 April 2003 AGE-NC Project No. 02-0962 Page 2 of 3 AGE examined the following methods of treatment an&or disposal of the stockpiled soil: 1. Natural Attenuation(on-site aeration); 2. Enhanced ex-situ bioremediation; 3. On-site thermal treatment; 4. Off-site thermal treatment; 5.. Asphalt reconstitution; 6. Off-site landfill disposal. The following is a brief summary of the relative feasibility and approximate costs of each ; treatment/disposal method: I Natural Attenuation Aeration, On-Site Enhanced Bio-Re ediation or On-Site Thermal Treatment: • Natural attenuation, enhanced bioremediation a nd thermal treatment all require significant space to either spread the soil or set-up large treatrr tent equipment.The site currently operates as a fueling facility and car wash.All the"on-site'methods would require significant space to spread the soil to achieve an effective treatmen . The use of large portions of the property would create an economic hardship for the prop rty owners. Furthermore, the property is surrounded by residential areas to the southeast,south and west and air board approval of the on-site processes would not likely be granted. The cost incurred for preparation of the soils for treatment, re-sampling and reporting is I estimated between $20 (aeration) and $40 (thermal treatment) per ton. i I Off-site Thermal Treatment: • Off-site thermal treatment would not, require additional space on-site. However, transportation of the soil to an off-site locality would be required. Disposal or resale of the treated soil would also require additional transportation of the soil. • The costs for transportation and off-site thermal treatment of the soil is estimated between $30 and$50 per ton. 1 Advanced GcoEnvironrnental,Inc.