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iii iiiiiiiiuiii iii <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman 51., Room 215 <br />Denver, Cobrado 80203 <br />Phone: (3031 866-3567 <br />FAX:13031832-8106 <br />June 7, 1995 <br />Michael G. Altavilla <br />Engineering Manager <br />Seneca Coal Company <br />P.O. Drawer D <br />Hayden, CO 81639 <br />Gary W. Wendt <br />Manager Environmental Affairs <br />Peabody Western Coal Company <br />1300 South Yale Street <br />Flagstaff, AZ 86001 <br />RE: Yoast Mine (C-94-082) <br />Permit Application <br />Dear Mr. Altavilla and Mr. Wendt: <br />I~~ <br />DEPARTMIiNT OF <br />NATURAL <br />RESOURCES <br />Roy Romer <br />Govenwr <br />WmesS La hheaA <br />Enec ut rve Diredo~ <br />nlichacl 8. Long <br />Divi pion Dueaor <br />The Division has reviewed the supplemental information provided by <br />SCC in regard to alluvial valley floors (AVF's) near the proposed <br />Yoast Mine and inspected four potential AVF's in the area. A <br />preliminary review of the probable hydrologic consequences section <br />of the PAP has also been completed, following submittal of life-of- <br />mine PHC projections. This information was provided by SCC in <br />response to items 53 and 59 in the Division's first adequacy <br />letter, dated January 20, 1995. <br />Below are comments regarding the Division's proposed findings about <br />the four potential AVF's near the Yoast Mine area and preliminary <br />adequacy questions which need to be addressed in the PAP. The <br />comments regarding AVF's are based on current information available <br />to the Division and may be subject to change, if justified by <br />additional responses from SCC. The discussion of AVF's below is <br />provided as an attempt to summarize what the Division feels are the <br />most relevant factors in the determination of the presence or <br />absence of AVF's in the Yoast Mine vicinity. <br />The Division's review of the quantitative analyses in the PHC for <br />life-of mine operations in the Sage Creek basin is not yet <br />complete. Any remaining questions will be forwarded to SCC as soon <br />as possible. Since mining operations proposed for the first permit <br />term do not affect the Sage Creek watershed, those questions can be <br />resolved at a later date, prior to mining operations entering the <br />Sage Creek watershed. Since potential hydrologic impacts in the <br />Sage Creek basin have not been entirely addressed, SCC should be <br />aware that a decision granting the Yoast permit would specifically <br />