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1 • 0 <br /> GEOMATRIX <br /> ' ALTERNATIVE 3 <br /> TANK AREA EXCAVATION TO 1-FOOT BELOW WATER TABLE <br /> ' PRELIMINARY COST ESTIMATE Page 1 of 2 <br /> Former ContiGroup Grain Elevator <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-ftz(3541 x 30-ft) The top 10-ft of overburden soil to be removed,stockpiled, <br /> and tested Overburden soil(390 cy)assumed to be non-hazardous and used to backfill excavation Excavation depth <br /> is 13-feet bgs and affected soil volume is approximately 117 cy(200 tons @ 125 Ibs/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 Following excavation,place oxygen enhancing material in completed excavation prior to backfill <br /> 6 Half existing 14-ft x 20-ft concrete pad to be removed Assumed 6-mch thickness Concrete debris estimated at 6 5 <br /> tons to be recycled <br /> 7 No asphalt pavement to be removed <br /> 8 No confirmation sampling of excavation <br /> 9 Free product(if present)will be removed from excavation using a vacuum truck <br /> 10 For cost estimating purposes,the affected soil is assumed to be transported to the Class II Forward Landfill in <br /> Stockton, CA, for disposal Soil waste to be profiled based on existing soil data prior to excavation mobilization <br /> 11 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 <br /> composite sample per 100 cy of soil <br /> 13 The conceptual design for this alternative(demo, shoring,excavation, and re-construction)was developed for cost <br /> 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 <br /> ' information on labor and material typical for similar projects The actual costs for this project may vary depending on the <br /> final design, contract bids,agencies' requirements, and/or the availability of equipment, materials, and/or contractors at the <br /> time of final remedial action design, construction, and/or implementation <br /> ' TASK <br /> ACTIVITY QUANTITY UNIT UNITS COST$ SUBTOTAL$ <br /> PLANNING and PREPARATION <br /> re- field activities 20,000 <br /> surveying 1 lump sum 5,000 5,000 <br /> workplan-excavation,disposal I lump sum 15,000 15,000 <br /> ' PLANNING and PREPARATION SUBTOTAL $ 20,000 <br /> ' EXCAVATION and BACKFILL <br /> Pre- eld activities 28,000 <br /> design shoring 1 lump sum 5,000 5,000 <br /> ' remove concrete slab and recycle debris 1 lump sum 5,000 5,000 <br /> decommission existing monitoring well 1 ea 5,000 5,000 <br /> remove overhead power line&pole 1 lump sum 8,000 8,000 <br /> pre-profile soil waste 1 lump sum 5,000 5,000 <br /> I\Doc Safe19000s\9963\CARAppB Altematrves As 10/6120043 15 PM <br />