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Geotechnlcal I Environmental Engineering • Materials Testing <br />October 9, 1995 <br />Twentymile Coal Company <br />29515 RCR #27 <br />Oak Creek, CO 80467 <br />Attn: Mr. Rick Mills <br />Subject: Pavement Evaluation & <br />Recommendations, Explosive Area Access <br />Road, Foidel Creek Mine, Routt County, <br />Colorado. <br />Gentlemen: <br />This report presents the results of a pavement evaluation and recommendations for the Explosive Area <br />(Magazine) Access Road located on the Foidel Creek Mine property in Routt County, Colorado. <br />A field exploration program was conducted to obtain information on [he subgrade conditions at the <br />• site. Material samples obtained during [he subsurface investigation were tested in the laboratory [o <br />provide data on the classification and engineering chazac[eris[ics of the subgrade soils. The results of <br />[he Field and laboratory investigations are presented herein. <br />This report has been prepared [o summarize 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 geotechaical engineering considerations related [o resurfacing of the access road are also <br />included. <br />We understand that this access road is approximately 2,000 feet in length. The access road will be <br />subjected to pickup truck traffic and occasional delivery and construction truck 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 />no[ drawn; however, a discussion of the subgrade soil types encountered in the test holes are presented <br />later in this report. <br />Samples obtained from the test holes were examined and classified in [he 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.C~ <br />