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COLORADO WESTMORELAND INC. P.O. Box 1299 Paonia, Colorado 81428 ^ 303-527-4135 suasio~4Rr of WESiLtpREL4 NO C04L COM P4Nv Dr, James Pendleton Colorado Mined Land Reclamation Division 423 Centennial Building 1313 Sherman Street Denver, Colorado 80203 RE: ROCK BUTTRESS Dear Jim: December 8, 1986 OEC 101986 MINED LANu RECLAMATION DIVISION Colorado Westmoreland Inc, proposes construction of a toe buttress in the sliding area east of the culvert entrance. Golder Associates visits have concluded the need to stabilize this sliding area, The orginial slide was mapped on page 2 of 10 - Geotechnical Conditions in the Golder Associates permit drawings, CWI surveyed the center line of the sliding area, This information was forwarded to Golder Associates for toe buttress design, Because of the over-abundance of rock material, the buttress is of a conservative size and was not designed in any detailed manner, The buttress proposed is approxi- mately 30 feet wide and approximately 40 feet high, Rased on the size of the actual slide, approximately 60 to 100 feet of buttress will be con- structed, The buttress will be constructed of massive sandstone and basalt boulders. Any excavation at the toe of the slide will be immediately followed by placement of rock material, In addition, dewateriny through the use of french drains may be completed at the top of the slide area, CWI anticipates further site inspections by Golder Associates for completion of proposed dewatering devises, The toe buttress will be constructed to snatch the existiny East Roatcap Creek alignment. No obstruction into the creek is anticipated, I have enclosed a plan view of the proposed toe buttress along with a cross- section in this area, Once again I thank you for your assistance, If you have further questions or comments, please contact me, MSS/SV Sincerel~y/,~ / ~ ~ ~ ,,/ ~ " Matthew S, Sakurada Manayer of Enyineering