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or~hWest Colorado Consultants, Inc. Geotechnical I Environmental Engineering • Materials Testing September 28,1995 Bower Bros. Construuion 595 Taylor Street Craig, CO 81625 Attn: Mr. Bud Bower Job No. 95-2296 Subject: On-site Inspections, Waste Coal Area, Foidel Creek Mine, Routt County, Colorado. Gentlemen, As requested, Northwest Colorado Consultants, Inc visited the projeu site on September 7, 8, 11, 14, 18 and 24, 1995 to observe and inspect [he next phase of the tce drain and toe buttress excavation being installed for the Coal Waste Pile. The contrauor had previously completed the toe drain for the northern 360 feet. TLe subjeu projeu is located at the Foidel Creek Mine in Routt County, Colorado. At the time of our visit on September 7, 1995, the convauor had completed approximately 550 lineal feet of additional toe buttress excavation and had begun to haul in and stockpile the drainage rock along [he east side of the proposed drain location. The [ce buttress excavation ranged from 35 to 45 feet in width and was excavated into the underlying shale bedrock materials. The uphill slope of [he excavation was constructed from a 2 (horizontal) : 1 (vertical) to a 1/4 (horizontal) 1 (vertical) configuration. Photographs of [he toe buttress excavation (Photos #1 & #2), taken on September 7, 1995, are attached . At the time of our visit on September 8, 1995, the contractor had started the cotutruuion of the toe drain from a point which was approximately 360 feet south of the outlet drain. The contractor had placed approximately 310 lineal feet of drainage rock to the south of the previously installed drain. The drainage rock was placed in a triangular configuration which ranged From 7 [0 8 feet in width and approximately 36 inches in height over a layer of Cilter fabric Filter fabric had also been placed over the top of [he gravel; however, the fabric placed over [he [op of the gravel was an impervious, woven material. We advised [he contractor that this fabric was no[ acceptable and the fabric would have to be removed and replaced with a material equivalent to Mirafi 140N as outlined in the project specifications. Photographs of the toe drain (Photos #3 and #4), taken on this date, are attached. As requested by the contractor, we visited the site on September 11, 1995 to reinspect the toe drain. The contractor had removed the fabric from the top of the gravel as requested; however, they had not placed any new fabric over the gravel. A[ the time of our visit on September 14, 1995, the contractor had placed two rolls of Amoco Petromat along the side of the drain. Based on the information sent to (970)879-7888 • Fax(970)879.7891 29585 U.S. 40 West, Box 775226 • Steamboat Springs, CO 80477