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' ALTERNATIVE A 2 <br /> . EXCAVATION 5'INTO WATERTABLE EXPANDED LATERALLY TO MW-3 <br /> PRELIMINARY COST ESTIMATE <br /> Former ConttGroup Gram Elevator <br /> ' 1805 Harbor Street <br /> Stockton,California <br /> Assumptions: <br /> 1 Excavation extent is defincd 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 2(77'x2.0') The top 10-ftof <br /> t overburden to be removed, stockpiled,and tested as one composite sample per 100 <br /> yd3 for TPHd and TPHg Overburden soil(672 yd 3)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 yd' (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 IT Forward Landfill in Stockton,CA,for disposal,with waste being profiled <br /> with existing soil data pnor 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 1CONTGRAN1StocktonlCAPlCap Addendum Costs&Supporting Cates <br />