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<br />blue <br />~b~bon <br />company <br />Susan J. Mowry, Reclamation Spe <br />Colorado Mined Land Reclamation <br />1313 Sherman Street, Room 423 <br />Denver, CO 80203-2273 <br />ke: iiine Benci~ Final Ccntcurs, <br />Dear Susan: <br />III IIIIIIIIIIIII III <br />blue ribbon coal company <br />p.o. box 1352 <br />palisade, Colorado 61526 <br />(303) 464-7951 <br />January 27, 1987 <br />~ialist ~~~~n ~„~,7~~ <br />Division ~ ~"-^'--' <br />u`S , <br />JAN 3 O 1°87 <br />File #C_pn7_g1 Niii~Ecu e.,.~..~ <br />The enclosed diagrams have been prepared to discuss the drainage work needed <br />on the mine portal bench that was reclaimed in 1986. The "Mine Bench Final <br />Contours" diagram was prepared from a survey taken on the bench at the <br />end of construction and from the proposed final contours shown on Exhibit V <br />of our mid-term review technical revision. The final contours below <br />6476' were a result of using less fill when restabilizing the mine bench than <br />originally planned. On top of the bench, the south end received slightly more <br />fill than planned and the north end received less fill. The primary cause of <br />less material on the north end was the inadequate supply of borrow material <br />in the permitted area. <br />The "Mine Bench Permanent Diversion" diagram was prepared to show a profile <br />of the top and bottom of the existing diversion and to show proposed work on <br />the diversion. The existing diversion has an overall grade of 1.3% but has <br />several level areas. The proposed grade will be the 2% originally approved. <br />The channel will be 7' wide at the bottom and have lh:1V side slopes for its <br />18" depth. Above the diversion, a 3h:1V slope will be cut to the existing ground <br />level. The approximately 200 cy. excavated will be distributed in low areas <br />to allow drainage into the diversion or over the face of the bench. A small <br />dozer er backhoe will be used to acr.omplish this work. Access will require <br />dry weather, possibly in mid-summer. The approximately 1/3 acre disturbed by <br />the work will be reseeded in the fall of 1987. <br />Let me know if there are any further questions concerning our proposed work <br />on the diversion. <br />Sincerely, <br />Larr~. Reschke <br />Project Engineer <br />LMR:jp <br />Lam./ <br />Enclosure <br />