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3.3 Soil Excavation and Disposal In this alternative, soil would be excavated and disposed of at an off-site disposal facility A Class II facility was assumed for the purpose of cost estimation because of the presence of TPH above 1,000 mg/kg The tasks associated with this option are as follows • Excavating and disposing of the existing cover material ' • Excavating a 20- by 20-foot pit down to 11 feet, and stockpiling the existing clean backfill ' • Overexcavating the sidewalls at a 1-to-1 slope from the surface to the excavation floor to prevent cave-in ' • Testing the soil to identify the limits of contamination • Transporting and disposing of impacted soil ' 0 Backfilling and compacting the excavation • Repaving the excavated area The cost associated with these tasks is estimated to be about $32,000, assuming the impacted soil can be disposed of at a Class II facility However, this is not a feasible option Nestle no longer owns the property and the present owner has a significant amount of truck traffic in the area of the impacted soil (the loading dock) An excavation ' in this area would shut down the trucking operations for at least a two week period In addition, there are structural concerns with the building at the site since it is located next to the area that would potentially be excavated 3.4 Soil Excavation and Incineration In this alternative, soil would be excavated and transported to a licensed incinerator site to be incinerated The tasks associated with this option are as follows ' • Excavating and disposing of the existing cover material ' + Excavating a 20- by 20-foot pit down to 11 feet, and stockpiling the existing clean backfill ' • Overexcavating the sidewalls at a 1-to-1 slope from the surface to the excavation floor to prevent cave-in t 11P721RXK00285 DOC-951 lc I Rev 0 8128195 22074-001 001 3-2. 1