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4Vasllington County Landfill Remedy I-easibility Assessment Date: l l/ l 5/07 Executive Summary (Continued) Plasma Torch This alternative involves excavating the waste material from the landfill and converting the waste onsite to gas and inert slag material using plasma torch technology. Prior to excavating waste the groundwater recovery and infiltration system would be shut down and the private well GAC treatment system program would be expanded. It is assumed that the void created by the waste excavation would be graded to nuninuze excessive slopes and the landfill cover soils would be re -placed and seeded. The preliminary projection of initial capital and long-term annual costs for this option are approximately $192,300,000 and $87,000 per year, respectively. Force Alain This remedial alternative involves pumping groundwater and discharging the untreated water to a force main, which would discharge to a waste water treatment facility (IviCES). This option would require the construction of more than three miles of new force main from the landfill to the nearest City of Oakdale sanitary sewer. Assuming eontintious operation of the groundwater recovery system, the Cumulative discharge to the Oakdale sanitary system and MCES treatment plant would be approximately 60 million gallons per year. The preliminary projection of initial capital and lon—tenth annual costs for this option are approximately $7,300,000 and $450,000 per year, respectively. Pump and Treat On Site 5upplernelltal treatment is requtrcd to remove 1'1 ('.'s to below the al)plicable I-IM- from the recovered groundwater. Thus s option includes treatnlenl Of cont,llninated groundwater by air stripping and iron removal followed I)v granular activated carlu.n ((iAC') to remove I'I=C compounds prior to discharge directly to the southeast infiltration basin. The preliminary projection of initial capital arid Ion,v-teen annual costs -for this Option are approximately $5,800,000 and $700,t.?(10 per year.. respectively. Dig and Truck This "}lle:rnalive would Involve excavaltno the: waste froill the landfill and transporting arl(i disposing cif the waste off'site at a licensed solid waste facility. Prior to excavating waste it is assumed that the groundwater recovery and infiltration system would be shut down and the private well GAC treatment system program would be expanded. It is assumed that the void created by file waste excavation would be graded to minimize excessive slopes and the landfill cover soils would be re -placed and seeded. The preliminary projection of initial capital and long -terns amlual Costs far this option are: approximately $66,800,000 and $87.000 per year, respectively. Dig and Line Tile alterrlanve would Involve nio%iing waste and constructing a lined landfill at the current Site. Waste from the existing landfill would be excavated and placed on site while the excavated area of the landfill is lined. The waste would then be placed back in the lined location. Prior to excavating waste it is assumed that the groundwater recovery and infiltration system would be shirt down and the private well GAC treatment system program would be expanded. The preliminary projection of initial capital and long-term annual costs for this Option are approximately $27,600,000 and $210,000 per year, respectively. A-MNPCA0802.00