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or[hWes[ Colorado Consultan Geouchninl! Enrironmenul Enjineerin` • Maceriah Tertin~ January 31, 1996 Tweatymile Coal Company 29515 RCR #27 Oak Creek CO 80477 Attn: Mr. Rick Mills Job No. 96-2505 Subject: Certification Letter, Haul Road B, Foidel Creek Mine, Rout County, Colorado. Gentlemen, I, Brian D. Len, a registered professional engineer, registry number 25750, in the state of Colorado, certify that Haul Road B was relocated and reconstructed to the spe~ca[ioas presented in Twentymile Coal Company's permit awnber C-82-056, except as noted below. During the period of October ?7, 1995 through December 20, 1995 periodic inspections of Haul Road B were made to verify that the embankment fills, subbase and road base gravels were placed and compacted to at leas[ 95% of the standazd or modified Proctor densities determined in accordance with ASTM D698 and ASTM D1557, respectively. The embankment fdl materials were compacted to at least 95% of the staadazd Proctor density and the subbase and road base gravels were compacted to at least 95% of the maximum modified Proctor density. The final surface of the road was also constructed with a sown of at least 1 percent. The subbase and road base gravels were placed to thickness' of 12 and 6 inches, respectively. Placement depths were verified during the periodic site inspections. The attached cross-section and centerline profile depict the final road alignment. The haul road was extended to the north through the existing storage area as opposed to the original alignment shown on Map 24, Surface Facilities. The map has been modified to show the revised road location. IF you have any questions~egarding this certification, or if we can be of further service, please contact this office. , / Sincerely, Y/ 2575t~ • `~ i Brian D. Len, P.E. A~ ~i (970) 879.7888 • Fax (970) 879-7891 29585 U.S. 40 West, box 775226 • Steamboat Springs, CO 80477