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~•!'~ <br />Richartl 0. Lamm <br />Governor <br />999 <br />DEPARTMENT OF NATURAL RESOURCES <br />David H. Getches, Executive Director <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SH ELTO N, Director _ <br />P c. <br />MEMORANDUM =' v <br />~12 Dec tuber 1986 <br />T0: Tom Schreiner - ~.~~ " <br />FROM: Jim Pendleton <br />RE: Orchard Valley.-West rtals - "Geotechnical Concerns" & "Rock Buttress" <br />(Permit No: C-83-038) <br />I have reveiwed the two separate letters referenced above, submitted by <br />Colorado Westmoreland, Inc. on December 10, 1986. I had previously discussed <br />both of these items with Mr. Sakurada, engineer for CWI, on Friday, December <br />5th. I requested that Mat follow up our conversation with a written submittal <br />to document the operator's requests. <br />The first letter ("Geotechnical Concerns") addresses a common earthern <br />construction problem. Oversize boulders are excavated and require special <br />handling when placed in the embankment. Golder Associates' recommendations <br />are acceptable. They recommend placement of rock in the central zone of the <br />embankment, in a small butress at the front of the first terrace and as riprap <br />along the groin of the embankment and the natural slope. All of these <br />suggestions are acceptable. <br />The second letter ("Rock Buttress") addresses the construction of a small rock <br />buttress to retain a landslide above the culvert inlet facility. The slide <br />had been mapped in pre-construction analyses of the site. The operator, based <br />upon Golder Associates' design recommendations, proposes to construct a rock <br />buttress adjacent to the toe of the landslide. The plan, as depicted in the <br />accompanying plan map and cross-sectional sketch is acceptable. <br />attachments: <br />cc: Bob Liddle <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />