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ii 999 -- 555 SOUTH CAMINO DEL RIO _ BODO PP.OFESSION AL CENTER UNIT A-I -_ =_ = POST OFFICE BOX 97 =_ ~_ -_ - _- _- DU RANGO COLORADO 813020097 _ =_ =_ TELEPHONE 970~2d7~1705 FAX 970-2671710 ENGINEERING B SURVEYING, INC. CONSULTING CIVIL AND SANITARY ENGINEERING LAND. UTILITY AND CONSTRUCTION SURVEYS Apri121. 1999 Harry Ranney Colorado Division of Mineral & Geology R~CF~VFp 1313 Sherman Street, Room 215 APR 2 Denver, co 80203 6 1999 RE: CARBON JUNCTION MINES NO. C-92-080 ~"'~s!°n 'I M10eraf~ 8 Geaogy Dear Harry: In accordance with earlier discussions with Jim Hendricks, representing Cazbon Junction Mine, and Mike Savage of Savage & Savage, Goff Engineering has prepazed maps and reports covering the filling and contouring of the fill pile which exists along the main haul road. Specifically, we have prepazed an "as-constructed" contour map of the pile which shows the design topography (from Map 5-10) overlaid with the actual fmished topography. Also, we have had Lambert & Associates run a representative "Slope Stability Analysis" for the pile as well. The results of both are attached. From the map we have determined that the Permitee has prepazed the finished pile to essentially comply with the design. There is some difference in the "nose" configuration near the north-central portion, but that does not effect the overall drainage characteristics from the pile. From earlier compaction testing we determined that the material was placed and compacted in compliance with the Permit and from the attached geotechnical report we have determined that a minimum safety factor of 2.9 exists on the slopes along the pile. Based on the above mentioned information, I have concluded that the shape and stability of the fill pile meets the requirement of the design and the Permit. cc: l) Jim Hendricks (w/enclosures) 2) Mike Savage