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III IIIIIIIIIIIII III <br />999 <br />STATE OF COLORADO <br />DIYISION OF MINERALS AND GEOLOGY <br />Depanmenl ul Natural Resources <br />171 J Sherman SL. Ruum ? I S <br />Denver, Colnradu BO?03 <br />Rhone. 17031 Rfifi-) 567 <br />fA%: (.{071 HJ1~810fi <br />January 24, 1996 <br />Mr. Michael G. Altavilla <br />Seneca Coal Company <br />P.O. Drawer D <br />Hayden, CO 81639 <br />RE: Seneca II-W Mine (C-82-057) <br />NOV C-95-023; Proposed Regrading & Channel Reconstruction <br />Dear Mr. Altavilla, <br />I~~ <br />DEPARTMENT OF <br />NATURAL <br />RESOURCES <br />Rov Romer <br />lames 5. LuchhraJ <br />E ~eanrve Dinrun <br />hLChael U. Lung <br />Dh„.on D„r~~~„ <br />The Division of Minerals and Geology received the proposed regrading and channel <br />reconstruction maps submitted by Terra Matrix as required under NOV C-95-023. This <br />letter is to reiterate our phone conversation of January 22, 1996 regarding the proposed <br />plan. <br />In general, the proposed drainage in the B Pit titled, upper 006-NE-2, appears to <br />approximate the previous location of the drainage. The new drainage meanders through the <br />B Pit, as opposed to the current straight channel configuration. The Division has a few <br />items that Seneca and Terra Matrix should clarify in the submittal of the technical revision; <br />1. The Existing New Channel 2 (upper portion) does not approximate [he original <br />drainage configuration. In the pre-mining map, this section of ditch does not appear. <br />The Division questions whether this upper portion of channel is necessary. It this <br />channel is necessary, the revision should include design specifics which consider the <br />revised topography. <br />2. The Proposed Upper 006-NE-2 Channel and Existing New Channel 1 meet in the <br />location of a topsoil pile. Ideally, this topsoil pile should be utilized prior to <br />construction of the lower portion of this channel, to avoid a temporary diversion <br />ditch. The map indicates that the 006-NE-2 channel will be routed to the east of the <br />topsoil pile. It appears that routing the channel to the west of the topsoil pile as a <br />temporary measure would be more stable in the long run. The pre-mining map also <br />depicts the two outfalls as separate and not joining before they enter the lower <br />