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ALTERNATIVE 6 GEOMATRIX
<br /> . COMPLETE EXCAVATION FOR ONSITE LOW-TEMPERATURE THERMAL DESORPTION
<br /> PRELIMINARY COST ESTIMATE
<br /> Former ContiGroup Grain Elevator Page 1 of 3
<br /> 1805 Harbor Street
<br /> Stockton, California
<br /> ' Assumptions
<br /> 1 Extent of excavation encroaches on two dead-end railroad tracks Both spurs will be closed temporarily for track removal excavation
<br /> and backfill,and track replacement
<br /> ' 2 Excavation area is approximately 11,300-ft2(I 10-ft x 140-ft) The top 10-ft of overburden soil to be removed,stockpiled,and tested
<br /> Overburden soil(4,200 cy)assumed to be non-hazardous and used to backfill excavation Excavation depth is 30-feet bgs and affected
<br /> soil volume is approximately 8,400 cubic yards(14,200 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-ftz)to be removed Assumed 9-inch thickness Disposal of asphalt debris at local rec)cle 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 gallons per
<br /> '
<br /> e
<br /> 9 The 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 permit
<br /> 10 Excavated soil affected by hydrocarbons will be treated on-site using low-temperature thermal desorption(LTTD) Treated soil will be
<br /> stockpiled on-site for replacement as backfill Significant area of facility will be required for treating and stockpiling soil
<br /> 11 12-inches of aggregate base rock to be placed and 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 100
<br /> cy Of soil
<br /> ' 13 The conceptual design for this alternative(dewatering,carbon treatment system,demo,shoring,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 /> ACTIVITY TASK
<br /> ' QUANTITY UNIT UNIT$ COST$ SUBTOTAL$
<br /> PLANNING and PREPARATION
<br /> pre-held activities 135,000
<br /> utility protection design&approval 1 lump sum 15,000 15,000
<br /> stormwater permit 1 lump sum 5,000 5,000
<br /> properties access agreements 1 lump sum 25,000 25,000
<br /> ' workplan-excavation,demolition,stormwater,disposal 1 lump sum 75,000 75,000
<br /> surveying 1 lump sum 15,000 15,000
<br /> PLANNING and PREPARA TION SUBTOTAL $ 135,000
<br /> DEWATERINGand TREATMENTSYSTEM
<br /> ' nre-field activities 32,000
<br /> city encroachment permit 1 lump sum 10,000 10,000
<br /> city sewer discharge permit 1 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 /> instal!goLatering treatments stem 49,000
<br /> install piping,Instrumentation,electrical controls 1 lump sum 20,000 20,000
<br /> dewatering pumps 2 ea 3 000 6,000
<br /> transfer pump 1 ea 1,000 1,000
<br /> fuel or electricity for pumps I ea 3,000 3,000
<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 /> ' 10oc_Safe\9000s19963\CARAppB Altematves xis 10/6/20049 52 AM
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