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h <br />Geatechnical! Enrironmenul EnQineerine • Materials <br />October 9, 1995 <br />Twen[ymile Coal Company <br />29515 RCR #27 <br />Oak Creek, CO 50467 <br />Attn: Mr. Rick Mills <br />Subject: Pavement Evaluation & <br />Recommendations, Refuse Pile Haul <br />Road, Foidel Creek Mine, Rou[[ County, <br />Colorado. <br />Gentlemen: <br />This report presents the results of a pavement evaluation and recommendations for [he Refuse Pile <br />Haul Road located on the Foidel Creek Mine property in Rout[ County, Colorado. <br />A field exploration program was conducted to obtain information on the subgrade conditions at the <br />• site. Material samples obtained during the subsurface investigation were tested in the laboratory to <br />provide data on the classification and engineering characteristics of the subgrade soils. The results of <br />the field and laboratory investigations are presented herein. <br />This report has been prepazed to summarize the data obtained and to present our conclusions and <br />recommendations, based on [he existing conditions encountered and [he assumed traffic loadings. A <br />discussion of geotechnical engineering considerations related [o resurfacing of the haul road are also <br />included. <br />We understand that this haul road is approximately 2,000 fee[ in length. The haul road will be <br />subjected [o heavy haul [rucks and scrapers, as well as pickup [ruck traffic. <br />Subsurface Conditions: The Field investigation for this project was conducted on September 13, 1995. <br />Two (2) test holes were advanced at the site to explore [he subgrade conditions and to obtain samples <br />For laboratory testing. The test holes were drilled with atrack-mounted drill rig utilizing 6-inch <br />diameter augers. The test holes were advanced to depths ranging from 3 to 4 feet. The test holes were <br />logged by a representative of Northwest Colorado Consultants, Inc. Graphic logs of the test holes are <br />not drawn; however, a discussion of [he subgrade soil types encountered in the test holes are presented <br />later in [his report. <br />Samples obtained From the test holes were examined and classified in the laboratory by the project <br />• engineer. Laboratory testing included standard property tests, such as natural moisture contents, dry <br />unit weights, grain size analyses and liquid and plastic limits. The laboratory testing was conducted in <br />general accordance with applicable ASTM and AASHTO specifications. <br />(970) 879.7888 • Fax (970) 879-7891 <br />29585 U.S. 40 West, Box 775226 • Steamboat Springs, CO 80477 ~~a(o <br />