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APPENDIX E <br /> REMEDIAL ALTERNATIVES EVALUATION <br /> Remedial alternatives are discussed in the following sections <br /> Alternatives <br /> Soil Excavation and Disposal <br /> Excavation of petroleum-impacted soil using either a backhoe or an excavator is suited <br /> to removal of shallow soils, typically to depths of 15 to 20 feet bgs, in the source zone. <br /> Large diameter augers are typically used to remove petroleum-impacted soil to depths up <br /> to 50 to 60 feet bgs The excavated soil is transported by a licensed waste hauler to an <br /> appropriate disposal facility based on a review of analytical results <br /> Soil Excavation and Treatment <br /> Petroleum-impacted soils are excavated to the extent practical and may be treated on site <br /> or at an off-site treatment facility. Potential ex situ treatment options include <br /> • Low Temperature Thermal Desorption (LTTD) Residual petroleum <br /> hydrocarbons are desorbed from soil at temperatures typically below <br /> 600 degrees Fahrenheit LTTD volatilizes the contaminant, the contaminant is <br /> captured by an extraction system and abated <br /> • Soil Aeration Aeration is appropriate for soils impacted by gasoline range <br /> hydrocarbons (<C 12) Ambient temperatures and mechanical nuxi<ng of the soil <br /> stockpile volatilize the contaminants to the atmosphere An initial stockpile <br /> sampling is typically required to determine baseline conditions and to establish <br /> aeration quantity per day in accordance with air quality regulations <br /> • Soil Washing Batches of soil are treated by mixing the soil with a solvent, <br /> separating the solvent from the soil, separating the waste from the solvent, and <br /> disposing the waste and recycling the solvent <br /> SAC11V 1PJ212794127941000 ICS-981cbell 8 Mon <br /> E-1 Rev 4,815!98 <br />