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ALTERNATIVE A 3 <br /> EXCAVATION per A 1 WITH LATERAL EXPANSION TO MW-3 <br /> ' PRELIMINARY COST ESTIMATE <br /> Former ContiGroup Grain Elevator <br /> ' 1805 Harbor Street <br /> Stockton,California <br /> 1 <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 /> I <br /> 2 Excavation overburden area is approximately 1,540 ft 2(77'x20') The top 10-ft of <br /> overburden to be removed, stockpiled,and tested as one composite sample per 100 <br /> yd3 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 951 yd3 (1,422 tons @ 125 lbs/fl 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 be shored for 28-ft deep soil removal <br /> '. 5 Groundwater depth approximately 12-ft bgs <br /> 6 Shored excavation will be dewatered during excavation and backfill Assume <br /> ' dewatenng 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 to 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 full 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 tune of ficial remedial action design,construction,and/or implementation <br /> 1 <br /> R 1CONTGRAN1StocktonlCAP\Cap Addendum Costs& Supporting Calcs <br />