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~• ~IIII~II~~I~~~~~II~ STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY Depanmenl of Natural Resources 1313 Sherman 51.. Room 21 5 Denver, Colorado 80203 Phone: 13031 866-3567 FAX: U031 8 3 2-81 06 April 1, 1994 Mr. Murari P. Shrestha Assistant Manager of Engineering Aestern Fuels - IItah 405 IIrban Street #305 Lakewood, Colorado 80228 Re: Preliminary Adequacy Review - Technical Revision TR-35 Deserado Mine (C-81-018) Dear Mr. Shrestha: ~~~~ DEPARTMENT OI NATURAL RESOURCE Roy Romer Governor Ken Saluar E~ecmive Director Mahael B. Long Division Direao~ The Division has completed a preliminary adequacy review of the above referenced technical revision for the Deserado Mine and has the following concerns: 1) WFU's letter, dated March 1, 1994, states that the revised permit page for Refuse Storage Area No. 3 will be submitted after TR-34 is approved. TR-34 will most likely be approved after TR-35. The revised text for TR-35 must be submitted prior to approval. Please provide the revised text regarding Refuse Storage Area No. 3. 2) Looking at Map 77 and aerial photographs of the refuse area haul road, it would appear that there will be approximately 800 feet of haul road upgradient that will drain to the refuse storage area. If the road is not crowned at the center or to one side so that it drains directly to the road ditches, drainage from the road surface may transport excessive refuse to the road ditches .and pond. If the road is not sloped for rapid drainage, WFU may need to install a water dip or water bar across the road on the upgradient (southwest) end of the refuse. A water bar or dip would not require designs prior to installation. Please inform us as to whether the road as currently graded would afford positive drainage, or if WFU will be installing a bar or dip. 3) A revised Map 77 was included with the application. The engineer's certification of the map was not dated, but it appears that the map was last certified in 1980. Each