2009-11-13_PERMIT FILE - C1982056 (3)

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quality coal and overburden stockpiles. A new coal refuse haulroad will be constructed from this point to the CRDA. A Site Plan showing the general configuration of the CRDA, along with the test hole and test pit locations, is presented in Figure #2. Previous Investigations and References A Geotechnical and Hydrologic Investigation for the existing refuse disposal area and in the area of the proposed expansion was completed by CTL/Thompson, Inc. in a report prepared for Cyprus Yampa Valley Coal Company under their job number 18,714 and dated August 14, 1992. The Geotechnical Investigation was updated by CTL /Thompson when the area of the refuse pile was reduced, in a report prepared for Twentymile Coal Company under their job number 22,253 and dated January 17, 1995. NWCC, Inc. also prepared a Supplemental Geotechnical Investigation and Stability Analyses report for the existing refuse pile under our job number 97 -3216 and dated December 18, 1997. This report was prepared for Twentymile Coal Company to supplement CTL/Thompson's 1995 report. These reports have been used to assist in the preparation of this report. NWCC, Inc. has also been monitoring the construction and testing the fill materials for compaction in the existing refuse pile since 1995. NWCC, Inc. has also completed several other geotechnical investigations for buildings, structures and shafts within the Foidel Creek Mine. • Site Conditions and Geologic Setting The Foidel Creek Mine facility is located within Sections 31 and 32 in Township 5 North, Range 86 West and southwest of the intersection of County Roads #33 and #27, in Routt County, Colorado. The mine facility is situated to the south of the Foidel Creek drainage. The project site is located to the east of an existing coal refuse pile situated within the Twentymile Coal - Foidel Creek Mine. The project site is located within an area that has been previously surface mined. The depth of the previous mining activity in this area is approximately 80 to 85 feet. The area was reclaimed with spoil materials in the late 1970's, which will be described in detail below. The topography of the project site is variable due to the previous site grading and reclamation of the surface mining operations. The reclaimed areas within a majority of the project site generally slope moderately to strongly down to the north- northwest on the order of 10 to 20 percent. The vegetation on the reclaimed slopes generally consists of grasses and weeds. The existing coal refuse disposal area at the west and northwest edges of the proposed CRDA are generally constructed at 3(H) to 1 (V) slope configurations and generally slope down to the east - southeast. The project site is situated in the Southern Rocky Mountain Province and lies at the east end of the Williams Fork Mountains. The site is located approximately 15 miles west of the west flank of the Park Range and approximately 10 miles northeast of the Dunkley Flattops. Portions of the Park Range are also referred to as the Gore Range in this area. The Dunkley Flattops are situated at the north end of the Flattops Range. • Job Number: 08 -7915 NWCC, Inc. Page 2 Revised 10/12/09