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• <br />Darry A. Ferguson <br />Registered Professional Engineer <br />Natural Resource Consulting <br />• iii iiiiiiiiniiiiii <br />Petroleum Coal <br />December 9, 1993 <br />Mr. Harry Ranney <br />Division of Minerals and Geology <br />1313 Sherman St. Room 215 <br />Denver, Colorado 80203 <br />Re: TR-O1 Technical Revision <br />Carbon Junction Mine <br />File No. C-92-080 <br />Dear Harry: <br />.. i ` ~='~ <br />DEC 13 1993 <br />Environmental <br /> <br />Transmitted herewith are the revised calculations for the "Storm" <br />program calculations for the culvert above Sediment Pond Na, 2. <br />According to nomograph analysis, the flow will pass through the 24" culvert <br />with less than two feet of head. This material should be inserted into <br />Appendix 5-2 of the permit application. <br />Should you have questions, please feel free to call. <br />Oakridge Energy, Inc. <br />cc: Sandra Pautsky <br />Jim Hendricks <br />6000 Wesf Mansfield +R15 Denver, Colorado 80235 (303) 985-9509 <br />