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Janet Dunlap, P .E. GeOSynte& <br /> 2 January 2008 consultants <br /> Page 4 <br /> landfill . Costs for the transport of the brush and trees are included in the proposal . Costs for the <br /> disposal of the brush and trees are the responsibility of IRC . <br /> The excavation work will be performed with standard excavation techniques and Occupational <br /> Safety and Health Administration (OSHA) trained personnel . Personnel will not be permitted to <br /> enter the excavation. The proposed excavation task costs are based upon a tiered excavation area <br /> (Figure 1 ), with an outer excavation area of 25 ft x 75 It x 7 ft deep and an inner tier excavation <br /> area of 15 ft x 50 ft x 4 ft deep (7 to 11 ft BLS ). This excavation footprint and associated soil <br /> volume could increase based upon the results of the delineation sampling. Upon excavation, the <br /> soils will be hauled to the IRC landfill for disposal . Costs for the transport of the excavated soils <br /> are included in the proposal . Costs for the disposal of the excavated soils are the responsibility <br /> of IRC . Additionally, up to 7,000 gallons of groundwater will be extracted from the center of the <br /> excavation area by a vacuum truck. The volume of groundwater was calculated using the volume <br /> of the inner tier excavation area (3 ,000 cubic feet) and an assumed porosity of 0.3 . The extracted <br /> groundwater will be hauled by the vacuum trucks for proper disposal at an approved industrial <br /> wastewater treatment facility (Jacksonville, FL). Costs for the transport and disposal of the <br /> extracted groundwater are included in the proposal . Upon completion of the groundwater <br /> extraction activities, the excavation area will be backfilled with clean backfill. <br /> To evaluate the impact of the saturated zone excavation and groundwater extraction, a <br /> confirmation groundwater sample will be collected from the center of the excavation area. It is <br /> anticipated that one of the previously installed shallow monitoring wells will be removed prior to <br /> excavation and will be reinstalled prior to backfilling activities. The groundwater sample will be <br /> collected from the re-installed monitoring well in accordance with FDEPs SOPS, February 2004, <br /> and analyzed by a fixed based laboratory for arsenic by EPA Method 6010 . <br /> Task 4 Contingency Costs. An excavation expense contingency cost has been added to this <br /> proposal to provide funding for a larger excavation area should laboratory analysis demonstrate <br /> that arsenic concentrations above the SCTL extend beyond the proposed 25 ft x 75 ft excavation <br /> area. The contingency costs assume that the excavation volume increase will not exceed 150 <br /> cubic yards. The Task 4 contingency costs will not be utilized without prior IRC notification and <br /> approval . <br /> XR07084/CCR08003 . DOC <br /> ciiginculs I scierltlsts I ltnioviLOIS <br />
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