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iii iiiiuiiiiiu iii <br /> STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Dcpanmcrn of Namoil Resources <br />I J 13 $hcrman $1., Roum ! 1$ <br /> <br />Denver, Colorado 80!0; ~ <br />~ <br />~ <br />Phone: 1'lU 51 8H6~ 356 i ~ <br />~~ <br />I <br />FAR: (11131 fl3?.81116 <br /> DEPARTMENT OF <br /> NATURAL, <br /> RESOURCES <br /> Roy Romer <br /> <br />June 5, 1998 Governor <br /> lame, s. Ln~hhe..d <br /> E.ecueve Dupaor <br /> htlchacl R Long <br /> Urvuion Dirccbr <br />Mr. Michael G. Altavilla <br />Seneca Coal Company <br />P.O. Drawer D <br />Hayden, CO 81639 <br />RE: Seneca [I-W Mine (C-82-057) <br />TR-30; Postmine Drainage & Topography <br />Dear Mr. Altavilla, <br />The Division received the technical revision (TR-30) addressing modifications to the postmining <br />channel designs and profiles for the Seneca II-W Mine (C-82-057). The revision was deemed <br />complete for filing on May 13, 1498. The Division's decision due date is July 12, 1998. The <br />Division has a number of questions that need to be addressed prior to approval of the revision; <br />Seneca revised a number of drainage channels to have a straight configuration down the <br />reclaimed slope rather than the meandering pattern previously approved. Drainages 006• <br />E1, 005-Gulch and 005-E1 proceed directly down the reclaimed slope rather than <br />meander. Drainage segments 006-SEl and 006-Gulch aze also straight channels. <br />Channels with a meandering pattern more closely resemble the premising drainage <br />configuration and may be less prone to erosion. Please reevaluate the proposed channel <br />configurations of segments 006-E1, 005-Gulch, 005-E1, 006-SEl and 006-Gulch so that <br />they more closely resemble the premise drainage channels. <br />On Tab 20 page 9, Seneca states that the drainage channels will not initially be topsoiled <br />to allow for initial stabilization. Once the channels are stabilized, the channels will then <br />be topsoiled and vegetated. Rule 4.05.3 requires that drainage channels be designed, <br />constructed and maintained to be stable. The Division cannot approve language in the <br />permit that allows drainages to be built unstable. Please revise the permit text and <br />channel designs to reference stable features. Placement of topsoil in the channel bottom <br />may not be advisable, unless channel stabilization and revegetation methods are <br />implemented in conjunction with topsoil placement. <br />