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ALTERNATIVE 5
<br /> pEOMATRIX
<br /> LIMITED EXCAVATION OF ON-SITE SOIL FOR OFFSITE DISPOSAL
<br /> PRELIMINARY COST ESTIMATE
<br /> Former ConttGroup Grain Elevator Page l 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 7,200 ftz(70-ft x 140-ft) The top 10-8 of overburden soil to be removed,stockpiled,and tested
<br /> Overburden soil(2,650 cy)assumed to be non-hazardous and used to backfill excavation Excavation depth is 30-feet bgs and
<br /> ' affected soil volume is approximately 5,300 cubic yards(9,000 tons @ 125 lbs/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 Existing 14-ft x 20-ft concrete pad to be removed Assumed 6-inch thickness Concrete debris estimated at 12 5 tons to be recycled
<br /> 6 Existing asphalt pavement(4,500-ft2)to be removed Assumed 9-inch thickness Disposal of asphalt debris at local recycle facility
<br /> 7 No confirmation sampling of excavation
<br /> 8 Shored excavation will be dewatered during excavation and backfill Assume dewatering extraction rate of approximately 25
<br /> gallons per minute
<br /> 9 The extracted water will be piped to a treatment system consisting of two 2,000-pound carbon units arranged in series,pumps,sand
<br /> filter,holding tanks,water-level controllers,piping,and manifold The treated water would be discharged to a City sewer with
<br /> permit
<br /> 10 For cost estimating purposes,the affected soil is assumed to be transported to the Class 11 Forward Landfill in Stockton,CA,for
<br /> disposal Soil waste to be profiled based on existing soil data prior to excavation mobilization
<br /> 11 Import fill from local source placed to one-foot below bottom of pavement 12-inches of aggregate based rock to be placed and
<br /> compacted to 95%relative compaction for pavement base
<br /> 12 Top 10-ft of stockpiled overburden soils to be sampled and analyzed for TPH-diesel and TPH-gasoline One composite sample per
<br /> ' 100 cy of soil
<br /> 13 The conceptual design for this alternative(dewatering carbon treatment system,demo,shoring,excavation,and re-construction)
<br /> was developed for cost analysis purposes only,additional evaluations will be necessary for the final system design if this alternative
<br /> is 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
<br /> and 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 S SUBTOTAL$
<br /> PLANNING and PREPARATION
<br /> re- field activities 45,000
<br /> stormwater permit I lump sum 5,000 5,000
<br /> surveying I lump sum 10,000 10,000
<br /> workplan-excavation,groundwater control,disposal I lump sum 30,000 30,000
<br /> PLANNING and PREPARATION SUBTOTAL 5 45,000
<br /> DEWATERING and TREATMENT SYSTEM
<br /> pre-field 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 /> inytall iewatering treatment system 48,000
<br /> install piping,instrumentation,electrical controls I lump sum 20,000 20,000
<br /> dewatering 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 I lump sum 10,000 10,000
<br /> carbon system(2 pairs of 2,000-pound GAC) I lump sum 9,000 9,000
<br /> 100c_Sate590Ws59963%CAP%AppB Alternatives xis IW6/20049 52 AM
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