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04/29/2003 12 05 2094671 AGE STOCKTON • PAGE 03 <br /> 25 April 2003 <br /> AGE-NC Project No 02-0962 <br /> Page 2 of 3 <br /> AGE examined the following methods of treatment and/or disposal of the stockpiled soil <br /> 1 Natural Attenuation (on-site aeration), <br /> :2 Enhanced ex-situ bioremediation, <br /> 3 Onsite thernmal 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 and approximate costs of each <br /> treatment/disposal method <br /> Natural Attenuatzon-Aeration, On-Sate Enhanced Bao-Remediation or Ort-Site Thermal Treatment <br /> • Natural attenuation, enhanced bioremediation and thermal treatment all require sigruficant <br /> ' space to either spread the soil or set-up large treatment equipment The site currently operates <br /> as a fueling facility and car wash All the"on-site"methods would require significant,space <br /> to spread the soil to achieve an effective treatment The use of large portions of the property <br /> would create an economic hardship for the property owners Furthermore, the property is <br /> surrounded by residential areas to the southeast,south and west and air board approval ofthe <br /> 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-sate 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 j <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 tort <br /> Advanced GeoEnviroumex,hd.inc <br />