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-2- <br /> 9 . The reanalysis of previously submitted arsenic data. <br /> 10 Detailed cost data for the "removal" alternative (four) to <br /> include the volumes of excavated waste upon which the <br /> calculations were based (total cost to be substantiated is <br /> $7 , 941, 400) . <br /> 11. A plan for excavation of the unauthorized hazardous waste <br /> disposal trench, north of the surface impoundment and <br /> disposal of the hazardous waste contained therein. <br /> 12. An operation and maintenance (0 & M) plan for the proposed <br /> extraction system. <br /> 13 . A workplan schedule that will complete the surface plan <br /> closure not later than September 15, 1989. <br /> It was understood from the meeting that the MCTC would attempt to <br /> provide the above listed information to the Department as soon as <br /> practicable with the winterization plan being provided within two <br /> weeks of the receipt of this letter . <br /> DG:ms <br /> DG2 . 088 <br />