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STATE OF COLORADO <br />DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866-3567 <br />FAX: (303) 832-8106 <br />January 13, 2011 <br />Mr. Roy Karo <br />Seneca Coal Company, LLC <br />37796 Routt County Road 53 <br />P.O. Box 670 <br />Hayden CO 81639 <br />RE: Seneca II Mine (Permit No. C-1980-005) <br />2009 Annual Hydrology Report <br />Dear Mr. Karo: <br />COLORADO <br />D I V I S ION OF <br />RECLAMATION <br />MINING <br />SAFETY <br />John W. Hickenlooper <br />Governor <br />Mike King <br />Executive Director <br />Loretta E. Pineda <br />Director <br />The Division has reviewed the 2009 Annual Hydrology Report submitted by Seneca Coal Company for <br />the Seneca II Mine. In general, the report was concise and thoroughly addressed the information <br />requirements of Rule 4.05.13(4)(c) and the approved permit application package. Based on our <br />review, we have the following comments: <br />1. Water monitoring frequency requirements were met at all surface and groundwater <br />monitoring sites. <br />2. Field parameters were collected and laboratory analyses were conducted as required at all <br />groundwater and surface water sites. <br />3. SCC noted and the Division concurs that, with four exceptions, groundwater levels are within <br />historic ranges. The exceptions are: <br />a. Well 70 in the Grassy Creek alluvium, which displayed its lowest level on record. The <br />low level (10.3' depth to water) occurred in October, and appears to be consistent <br />with the decreased levels exhibited at this well since 1997. The previous low was <br />10.17' in October of 2008. <br />Office of Office of <br />Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines