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29 October 1997 <br /> AGE-NC Project No. 97-0312 <br /> Page 3 of 4 <br /> 2. Remove loose and disturbed soil remaining in the UST excavation. Soil will be added to <br /> existing stockpile. <br /> 3. Backfill lower portion of the excavation with the imported clean soil. <br /> 4. Excavate soil from the western portion of the site, near Newton Road, to a depth of <br /> approximately three feet. The lateral extent of excavation will be determined by the volume <br /> of soil needed for backfilling of the excavation. <br /> 5. Transport and place `native' soil in the upper portion of the former UST excavation using <br /> a loader. The excavation will be backfilled to approximately one foot below grade to allow <br /> for future site surfacing. <br /> 6. Compact soil in the excavation. Soil will compacted in approximately three foot lifts using <br /> a compactor. Water will be added to soil as needed to achieve maximum compaction. <br /> 7. Perform compaction testing as backfilling progresses to assure 90 per cent compaction. <br /> 3.2. TREATMENT OF STOCKPILED SOIL <br /> For treatment of stockpiled soil, the following procedures Neill be performed. <br /> 1. Collect soil samples from the stockpiled soil. Samples will be collected in pre-cleaned brass <br /> sleeves. <br /> 2. Cover sample ends with Teflon sheets, cap, seal with tape and store on ice pending <br /> transportation to a state-certified laboratory. <br /> 3. Label and log soil samples on a chain-of-custody form. <br /> 4. Analyze soil samples for total petroleum hydrocarbons quantified as gasoline (TPH-g) and <br /> diesel (TPH-d) in accordance with EPA method 5030/8015m, for volatile aromatics <br /> (benzene, toluene, ethylbenzene and xylenes: BTE&X) in accordance with EPA method <br /> 8020, and for physicochemical properties and bioenumeration. <br /> 5. Line the treatment cell with plastic sheeting. The western area excavated for `native' backfill <br /> material will be used for the treatment cell. <br /> 6. Place slotted PVC casing in the bottom of the treatment cell. The PVC may later be <br /> connected to a low pressure blower to supply oxygen (air) to the soil to promote <br /> bioremediation. <br /> 7. Add nutrients and hydrocarbon-degrading bacteria to soil during the transport process. <br /> Advanced GeoEnvironmental,Inc. <br />