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ALTERNATIVE A 2 <br /> EXCAVATION 5'INTO WATERTABLE EXPANDED LATERALLY TO MW-3 <br /> PRELINr1NARY COST ESTIMATE <br /> Former ContiGroup Grain Elevator <br /> 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 <br /> pole,and MW-3. <br /> 2. Excavation overburden area is approximately 1,540 ft z(77'x20'). The tap 10-ft of <br /> overburden to be removed,stockpiled,and tested as one composite sample per 100 <br /> yd'for TPHd and TPHg. Overburden soil(672 yd)assumed to be non-hazardous <br /> and used to backfill excavation. Average excavation depth of 27-ft for a total <br /> amount to be disposed of 627 yd3(1,057 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 not be shored for soil removal only 5'into watertable. <br /> 5. Groundwater depth approximately 12-ft bgs. <br /> 6. Shored excavation will be dewatered during excavation and backfill as needed. <br /> Assume 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 <br /> controllers,piping and manifold. The treated water is to be discharged to a City <br /> sewer with appropriate permits. <br /> 8. For cost estimating purposes,the affected soil is assumed to be transported to the <br /> Class H Forward Landfill in Stockton,CA,for disposal,with waste being profiled <br /> with 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 firm 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'requirements,and/or availability of equipment,materials,and/or <br /> contractors at the time of final remedial action design,construction,and/or implementation. <br /> R:ICONTGRAN1Stockton\CAP\Cap Addendum Costs&Supporting Calcs <br />