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STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303)866-3sb7 <br />rAX: (303) 832A106 <br />3 August 2006 <br />Mr. George Patterson <br />Kerr Coal Company, Marr Mine <br />P.O. Box 459 <br />Florence CO 80480 <br />Re: Marr Mine (C-1980-006) 2005 AHR Review <br />Dear Mr. Patterson: <br />COLORADO <br />DIVISION O F <br />MINISLRALS <br />GEOLOGY <br />0.ECLANATIO N•NINING <br />EAFETY•SCIENCE <br />Russell George <br />Executive Director <br />Bill Owens <br />Governor <br />Ronald W. Cattany <br />Division DireROr <br />Natural Resource Trustee <br />The Division has completed review of the annual hydrology report for the 2005 water <br />yeaz (2005WY). The following comments relate the data contained in the AHR to the <br />probable hydrologic consequences (PHC) prediced in the permit application document. <br />The AHR indicates that all required monitoring was accomplished according to the <br />existing water monitoring plan and Rule 4.05.13. <br />PHC: there will be increased runoff and erosion during mining <br />The mine is in the reclamation phase and there was no evidence of increased run-off or <br />erosion. Calculations were presented in recent bond release applications to demonstrate <br />that revegetation cover is sufficient to reduce sediment loss to levels lower than pre- <br />mining conditions. This appears to be the case. <br />PHC: There will be increased sediment load in the drainages within the mine plan <br />area during mining. <br />Since the mine is in the reclamation phase, this is no longer relevant. <br />PHC: There will be increased salt loading in streams draining the mine plan area. <br />This does not really appear to be the case. Certainly, during the 2005 WY, the ponds <br />discharged very little. Ponds A, D, and F discharged during the April 5 and 11 <br />samplings only; pond # discharged those two weeks and also the following week (April <br />19). A trickle of water was recorded from ponds D, E and F during the June 8 sampling. <br />Additional total dissolved solids to the streams in the azea was negligible. <br />Office of Office of Colorado <br />Mined Land Reclamation Active and Inactive Mines Geological Survey <br />