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ESPEY, HUSTON~ISSOCIATES, INC. <br />Engineering & Envlr`onmental Consultants <br />650 SOUTH CHERRY;STREET, SUITE 320 <br />DENVER, COLORADO 80222 <br />(303) 3991080 <br />22 October 1980 <br />Richazd Gurske <br />Senior Environmental Engineer <br />Northern Coal Company <br />P.O. Box 17583 T.A <br />Denver, Colorado 80217 <br />Dear Richazd: <br />NOME OFFICE <br />P.0 BOX 515 <br />AUSTIN, TEXA6 78767 <br />Job No. 884-03 <br />Attached please find calculations for sizing of the sediment pond for <br />Phase 1 of the Refuse Disposal Facility for the Northern No. 1 (FF Seam) Coal Mine. <br />Y.'ou will note that a+e have used very conservative assumptions. This allows us to <br />produce this calculation quickly and demonstrate that the pond is oversized for <br />Phase 1. As discussed yesterday, we will now move forwazd with more precise <br />calculations to verify the sizing of the pond for the ultimate project. <br />If you have any questions please do not hesitate to call me. <br />Very truly yours, <br />i Q/ <br />John Schenck~~ T <br />Attachment <br />JS/JTJ/myp <br />cc: Tom Joyce, EHA <br />Gregg Lewicki, NCC <br />Terry Schultz, NCC <br />