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GeoSyntec Consultants <br /> Himanshu H . Mehta, P . E . <br /> 14 December 2005 <br /> Page 4 <br /> • set up and operate dewatering fluids treatment equipment, which wil include a <br /> frac tank for flow equalization and recovery of any PSH , and an Pp <br /> �ir stripper <br /> with treated effluent discharge via spray irrigation to an open area n rth of the <br /> excavation area; <br /> • provide a mobile laboratory (one day) to document that the Dewatering <br /> treatment system meets discharge standards ; <br /> • provide temporary connection of the AST or a temporary AST to the generator <br /> building ; <br /> • perform activities associated with the proper closure and off- site disposal of the <br /> 6 , 000 -gallon UST , including required soil and groundwater sampling ; ', <br /> • excavate petroleum contaminated soil , with off- site disposal to the IRC Class I <br /> landfill, including hand or vacuum excavation of soil within the utility corridor <br /> adjacent to the UST area, and required soil and groundwater sampling <br /> • apply Oxygen Release Compound ( ORC) in the open excavation immediately <br /> prior to backfilling to promote the aerobic biodegradation of residual petroleum <br /> contamination in the soil and groundwater; and <br /> • place backfill (in compacted lifts) , repair asphalt roadway and re-pa*e, install <br /> and sample monitoring well (installed within the center of the forgner UST <br /> area) , and place sod . <br /> GeoSyntec will subcontract UST closure/source removal services to' <br /> FECC, <br /> perform oversight of the subcontractor during field activities , and conduct regired soil <br /> and groundwater sampling activities and flame ionization detector (FID ) monitoring. <br /> GeoSyntec will document construction progress and ensure that activities are cmpleted <br /> in accordance with the plans and specifications . Due to the uncertainties associated <br /> with the source removal activities , a 15 percent contingency has been added to <br /> subcontractor task cost . The contingency is in place to cover items such as 'ncreased <br /> excavation volumes (based upon the discovery of additional petroleum- contaminated <br /> soil during excavation) , increases in project duration due to weather, etc. G oSyntec <br /> will notify IRCDUS of any field conditions that may require accessibility of contingency <br /> R050083/XR05088 — UST Closure Cost Proposal <br />