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ALTERNATIVE 4 GEOMATRIX
<br /> TANK AREA EXCAVATION
<br /> PRELIMINARY COST ESTIMATE
<br /> Former ContiGroup Grain Elevator Page I of 2
<br /> 1805 Harbor Street
<br /> Stockton, California
<br /> Assumptions
<br /> 1 Extent of excavation on property up to chain-link fence
<br /> 2 Excavation area is approximately 1,050-fe(35-ft x 30-ft) The top 10-ft of overburden soil to be removed,stockpiled,and tested
<br /> Overburden soil(390 cy)assumed to be non-hazardous and used to backfill excavation Excavation depth is 30-feet bgs and affected soil
<br /> volume is approximately 780 cy(1,315 tons @ 125]bs/ft3 density)
<br /> 3 Excavation will be shored for 30-feet deep soil removal
<br /> 4 Groundwater depth approximately 12-ft bgs No buried utilities assumed
<br /> 5 Half existing 14-ft x 20-ft concrete pad to be removed Assumed 6-inch thickness Concrete debris estimated at 6 5 tons to be recycled
<br /> 6 No asphalt pavement to be removed
<br /> 7 No confirmation sampling of excavation
<br /> 8 Shored excavation will be dewatered during excavation and backfill Assume dewatering extraction rate of approximately 15 gallons per
<br /> minute
<br /> 9 The extracted water wilI be piped to a treatment system consisting of one 2,000-pound carbon unit arranged in series,pumps,sand filter,
<br /> holding tanks water-level controllers,piping,and manifold The treated water would be discharged to a City sewer with permit
<br /> 10 For cost estimating purposes,the affected soil is assumed to be transported to the Class II Forward Landfill in Stockton,CA,for disposal
<br /> Soil waste to be profiled based on existing soil data prior to excavation mobilization
<br /> I Import fill from local source placed to ground surface
<br /> 12 Top 10-ft of stockpiled overburden soils to be sampled and analyzed for TPH-diesel and TPH-gasoline One composite sample per 100 cy
<br /> of soil
<br /> 13 The conceptual design for this alternative(dewatering,carbon treatment system,demo,shonng,excavation,and re-construction)was
<br /> developed for cost analysis purposes only,additional evaluations will be necessary for the final system design if this alternative is
<br /> implemented
<br /> 14 No air monitoring required
<br /> 15 No dust control or vapor suppressant required
<br /> 16 Municipal water supply available on-site
<br /> Notes
<br /> The following costs were estimated based on a conceptual design of the remedial action and readily available cost information on labor and
<br /> material typical for similar projects The actual costs for this project may vary depending on the final design,contract bids,agencies'
<br /> requirements,and/or the availability of equipment,materials,and/or contractors at the time of final remedial action design,construction,
<br /> and/or implementation
<br /> ' TASK
<br /> ACTIVITY QUANTITY UNIT UNIT$ COST$ SUBTOTAL$
<br /> i
<br /> PLANNING and PREPARATION
<br /> pre-field activities 35,000
<br /> stormwater permit 1 lump sum 5,000 5,000
<br /> surveying I lump sum 5,000 5,000
<br /> workplan-excavation,groundwater control,disposal 1 lump sum 25,000 25,000
<br /> PLANNING and PREPARATION SUBTOTAL $ 35,000
<br /> DEWATERING and TREATMENT SYSTEM
<br /> re-veld activities 22,000
<br /> city sewer discharge permit I lump sum 10,000 10,000
<br /> design treatment system,procure equipment 100 hr 100 10,000
<br /> underground utility locator 1 lump sum 2,000 2,000
<br /> install dewatering treatment system 48,000
<br /> install piping,instrumentation,electrical controls 1 lump sum 20,000 20,000
<br /> dewatenng pumps 2 ea 3,000 6,000
<br /> transfer pump I ea 1,000 1,000
<br /> fuel or electricity for pumps 1 ea 2,000 2,000
<br /> rental of holding tanks 1 lump sum 10,000 10,000
<br /> carbon system(1 pairs of 1,000-pound GAC) 1 lump sum 9,000 9,000
<br /> 1\Doc Safe19000s19963iCAP'Appt3 Attematives xis IOIW20049 52 AM
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