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• iii iiiiiiiiiiiii iii <br />United States Department of the Interior <br />OFFICE OF SURFACE MINING <br />Reclamation and Enforcement ~ ~ <br />POST OFFICE BLDG. RM. 270 ~~ ~n , <br />1823 STOUT' STREET v! ~`-" ,'v~l <br />DENVER, COLORADO &1202 <br />September 21, 1979 <br />'~' d. <br />Mr. Roy Lipson <br />P.o. Box 1382 SEP 2 7 19?9 <br />Steamboat Springs, Colorado 80477 <br />Dear Mr. Lipson: MINED LAND REC'_uor;A.r!pp~ <br />Coio. Dept. of Naturu~ ;;,;,,u,ces <br />Thank you for the additional information on the road profiles for Rockcastle Coal <br />Company's Grassy Creek Mine. For my own information, please indicate whether you <br />are a registered engineer in the State of Colorado. <br />Also, please note the enclosed copy of the Area B road profile. I have noticed <br />the addition of the 13.9 per cent grade at the upper portion of the road. Could <br />you tell me the length of road which runs at this grade? I do recall your telling <br />me that given percentages represent maximum grades for any 100 foot length of road. <br />Does this 13.9 per cent apply to no more than a 100 Foot stretch? <br />I have taken the liberty of computing some grades and distances from the data you <br />have supplied. The results of my figures indicate an overall sustained grade of <br />10.6 per cent for the 2600 foot length of road, (A-C). The results also indicate <br />an overall sustained grade of 11.0 per cent for the 1700 foot length of road, <br />(A-B). In my computations, I used the scale represented by your data of 1 square <br />equals 20 feet on the horizontal axis, and one square equals 2.5 feet on the verti- <br />cal axis. <br />Please review the resulting percentages, shown in red. Also enclosed is a copy of <br />the road design criteria in Section 715.17 of the OSM 30 CFR Publication. Thi is <br />the currently applicable interim regulation. Highlighted are (A) and (C) of (,~)(2) <br />(li). I am having trouble coinciding your percentages with mine. The percentages <br />and distances I have come up with will not satisfy the above referenced (A) and (C). <br />Proof of compliance with 30 CFR 715.17 (,~)(2)(ii)(A) and (C) needs to be supplied <br />in a form of data which reflects the required road grades within the given distances. <br />Thank you for your attention to this matter. <br />Sincerely, <br />Eileen Doherty <br />Reclamation Specialist <br />Enclosures <br />cc: Don Mallory, President Rockcastle Coal Company <br />Dean Massey/State of Colorado <br />