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a <br />Geotechnical I Environmental Engineering • Materials Testing <br />December 10, 1996 <br />Twentymile Coal Company <br />29515 RCR #27 <br />Oak Creek, CO 80467 <br />Attn: Mr. Rick Mills <br />Subject: Pavement Evaluation & <br />Recommendations, Rock Dust Bin Access <br />Road, Foidel Creek Miae, Routt County, <br />Colorado. <br />Gentlemen: <br />This report presents the results of a pavement evaluation and recommendations for the Rock Dus[ Bin <br />Access Road located on the Foidel Creek Mine property in Routt 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 feld and laboratory investigations are presented herein. <br />This report has been prepared to 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 geotechnical engineering considerations related to resurfacing of the access road are also <br />included. <br />We understand that the subject road is approximately 400 to 500 feet in length. The access road is <br />subjected to pickup truck traffic and occasional delivery and construction truck traffic. <br />Subsurface Conditions: The field investigation far this project was conducted on November 25, 1996. <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 excavated with a rubber tine backhoe. The test holes were <br />advanced [o depths ranging from 2 to 3 fee[. The test holes were logged by a representative of <br />Northwest Colorado Consultants, Inc. Graphic logs of the test holes are not drawn; however, a <br />discussion of the subgrade soil types encountered in the test holes are presented later in this report. <br />Samples obtained from [he 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, Boz 775226 • Steamboat Springs, CO 80477 ~~01~ <br />