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• <br /> 7huidwelURollo <br /> The volume of soil removed from each site will be in part dependent on the redevelopment plan <br /> used. In developing the following estimates, we have assumed that"spot excavation" of specific <br /> areas will be performed, in combination with site capping. This will be the most likely approach <br /> taken. These costs represent only hauling and disposing and assume a minimum of 20 tons per <br /> truck load. <br /> A reasonable cost estimate for a contractor to excavate and stockpile soil for disposal is $6.00 to <br /> $8.00 per ton. A reasonable cost estimate for a contractor to import and compact clean soil to <br /> replace excavated soil is $10.00 to $14.00 per ton. These costs assume that equipment is already <br /> on site for construction activities. <br /> Area 10 <br /> PNAs were found in the upper 3 to 6 feet of soil at eight locations (I OB-3, IOB-4, IOB-6, <br /> • 1013-713, 1013-15, 1OB-17, 1013-18, l OB-23). A generally accepted approach to developing <br /> remediation cost estimates is to assume a certain volume of soil will be excavated, with final <br /> volumes determined by field confirmation testing. Estimated volumes are determined by using <br /> surrounding soil data to calculate the likely extent of contamination at a specific point. For the <br /> purpose of this Feasibility Study, we have assumed that an area five feet square by seven feet <br /> deep will be excavated around each area of known PNA contamination. Arsenic concentrations <br /> at two areas exceed the 20 mg/kg cleanup level, at one and three feet below grade. The depth <br /> was chosen to go below the known depth of contamination, and the horizontal area is based on <br /> the observation that soil contamination appears to be "point specific." Using these assumptions, <br /> approximately 65 cubic yards of soil will be excavated and disposed of off site at a Class 1I <br /> Non-Hazardous Landfill. Using the range of unit costs presented above and a cubic yards-to-ton <br /> conversion ratio of 1.5 tons/cubic yard,the cost of excavating and disposing of contaminated soil <br /> from Area 10 should range from $4,000 to $5,100. <br /> The costs associated with remedial action planning, management, and reporting, which would <br /> • likely be required by DTSC at this site include preparing a Remedial Action Work Plan and <br /> 28 <br /> 25970318.PGS 15 November 2000 <br />