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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} 866-3567 <br />FAX: (303)832-8106 <br />May 7, 2003 <br />Grant Johns <br />American Civil Constructors, Inc. <br />410 20th St., Ste. S-1 <br />Glenwood Springs, CO 81601-4272 <br />Re: 1't quarter 2003 Sediment Pond Report Review <br />Rimrock Strip Mine (Permit No. C-89-074) <br />Dear Mr. Johns: <br />DIVISION O F <br />MINERALS <br />GEOLOGY <br />RECLAMATION <br />MININ G•SAFETY <br />Rill Owens <br />Govemar <br />Greg E. Walther <br />Executive Director <br />Ronald W. Cattany <br />Division Director <br />The Division of Minerals and Geology has reviewed the sediment pond report for the 1st <br />quarter 2003 submitted by Greg Lewicki and Associates for the Rimrock mine. The inspection <br />was delayed until early April due to a late March record snowstorm in the region. <br />The report complies with the requirements of Rule 4.05.6(13) for inspection of sediment ponds <br />at coal mining sites. Generally, the pond holds water only for limited periods after storm runoff <br />events. Adequate sediment and water storage capacity, spillway function, and embankment <br />stability was noted. Mr. Lewicki noted no remarkable observations. Based on our independent <br />observations during field inspection we concur with the observations as noted. One exception <br />is the observation of excellent vegetation on the pond embankment. Most perennial species on <br />the embankment seem to be annual weeds of various varieties. Although stability does not <br />appear to be jeopardized, the long-term stability of the embankment would be improved by <br />better establishment of grasses and forbs similar to the reclaimed area. <br />We have no questions regarding this report. Thank you for your diligence in completing your <br />monitoring requirements in accordance with the Rules governing coal mining. <br />If you have any questions, please contact me. <br />Sincere) ~A- <br />1 <br />Ken .Gorham <br />Environmental Protection Specialist II <br />