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~NorthWest Colorado <br />• <br />Geocechnical l Environmental Engineering • Ma[erlals Terting <br />January 3, 2000 <br />Twentymile Coal Company <br />29515 RCR q27 <br />Oak Creek, CO 80467 <br />Attn: Mr. Rick Mills <br />Job Number 99-4004 <br />Subject: Roadway Evaluations, Foidel <br />Creek Mine Haul/Access Roads, Routt <br />County, Colorado. <br />Gentlemen: <br />This report presents the results of a roadway evaluation for three roadways located a[ the Foidel Creek <br />Mine property in Routt County, Colorado. More specifically, the roadways include the Eastern <br />Extension of Haul Road B; the West Refuse Pile Haul Road; and the Fish Creek Borehole Access Road. <br />Afield exploration program was conducted to obtain information on the existing gravel pavement <br />sections and the subsurface conditions. Material samples obtained during the subsurface investigation <br />were tested in the laboratory to provide data on the classification and engineering characteristics of the <br />road base gravels and the subgrade soils. The results of the field and laboratory investigations are <br />presented herein. <br />This repon has been prepared to summazize the data obtained and to present our conclusions and <br />recommendations, based on the existing conditions encountered and the assumed traffic loadings. A <br />discussion of geotechnical engineering considerations related to improvement of the existing roadways in <br />the selected areas are also included. <br />Proaosed Construction: We understand that this project will consist of the improvement of the gravel <br />sections for the existing roadways and the construction of a new gravel section for the haul road situated <br />at the west edge of the Refuse Pile. The existing roadways, which will be improved include the eastern <br />extension of Haul Road B and the Fish Creek Borehole Access Road. All of the subject roadways will be <br />gravel surfaced. It is our understanding that the haul roads will be subjected to a mixture of automobile <br />and off road haul trucks and eatth moving equipment. The access roads will generally be limited to <br />pickup traffic and occasional delivery trucks or construction vehicles. <br />Site Conditions: At the time of this investigation, the subject roadways were surfaced with highly <br />variable amounts of granular road base. The roadway surfaces generally appeared to be in poor to good <br />• condition and the majority of the roadway subgrade materials appeazed stable at the time this repon was <br />prepared. The existing roadways generally had been constructed with drainage/borrow ditches along <br />3 , (970) 879.7888 • Fax (970) 879.7891 ~~.~~~f~F~fl g' APR 1 4 2uud <br />2063 Snow Bowl Plaza, P.O. Boz 775226 • Steamboat Springs, CO 80477 <br />