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1 <br /> tALTERNATIVE A 1 <br /> EXCAVATION TO 500 mg/Kg LINE <br /> PRELBUNARY COST ESTIMATE <br /> Former ContiGroup Grain Elevator <br /> 1 1805 Harbor Street <br /> Stockton,California <br /> Assumptions: <br /> 1 Excavation extent is defined roughly as an ellipse bound by HA-8,HA-9,utility pole, <br /> and MW-4 <br /> 2 Excavation overburden area is approximately 1,350 ft 2(67 5'x20') The top 10-ft of <br /> ' 3 <br /> overburden to be removed, stockpiled,and tested as one composite sample per 100 yd <br /> for TPHd and TPHg Overburden soil(505 yd3)assumed to be non-hazardous and <br /> ' used to backfill excavation Average excavation depth of 27-ft for a total amount to be <br /> disposed of 850 yd (1,422 tons @ 125 lbs/ft density) <br /> 3 Half existing 14'x20' concrete pad to be removed with assumed thickness of 6-in <br /> estimated at 6 5 tons to be recycled No asphalt pavement to be removed <br /> 4 Excavation will be shored for 28-ft deep soil removal <br /> ' 5 Groundwater depth approximately 12-ft bgs <br /> 6 Shored excavation will be dewatered during excavation and backfill Assume <br /> dewatering extraction rate of 15 gallons per minute(gpm) <br /> 7 Extracted water will be piped to a treatment system consisting of one 2,000-pound <br /> carbon unit arranged in series,pumps,sand filter,holding tanks,water level controllers, <br /> piping and manifold The treated water is to be discharged to a City sewer with <br /> appropriate permits <br /> ' 8 For cost estimating purposes,the affected soil is assumed to be transported to the Class <br /> Il Forward Landfill in Stockton,CA, for disposal,with waste being profiled with <br /> existing soil data prior to excavation mobilization <br /> ' 9 Import fill material from local source <br /> 10 No air monitoring required <br /> 11 No dust control or vapor suppressant required <br /> 12 Municipal water supply available at site <br /> Notes: <br /> The following costs are estimates as provided by a local fum based on a conceptual design of the remedial action <br /> and cost information on labor and material typical for similar projects The actual costs for this project may vary <br /> depending on final design,contract bids,agencies'requwements,and/or availability ofequnpment,materials,and/or <br /> contractors at the time of final remedial action design,construction,and/or unplementation. <br /> R 1CONTGRAN1StocktonlCAPICap Addendum Costs&Supporting Calci <br /> 1 <br />