Laserfiche WebLink
c:t Colorado Consu <br />Geotechnlcal I Environmental Engineering • Materials <br />October 9, 1995 <br />Twentymile Coal Company <br />?9515 RCR #27 <br />Oak Creek, CO 80467 <br />Attn: Mr. Rick Mills <br />Subject: Pavement Evaluation & <br />Recommendations, Batch Load Ou[ <br />Access Road, Foidel Creek Mine, Routt <br />County, Colorado. <br />Gentlemen: <br />This report presents the results of a pavement evaluation and recommendations for the Balch Load <br />Out Access Road to be located on the Foidel Creek Mine property in Routt Counry, Colorado. <br />This report has been prepazed [o summarize the data obtained and to present our conclusions and <br />• recommendations, based on [he existing conditions encountered and the assumed traffic loadings. A <br />discussion of geotechnical engineering considerations related to construction of the access road are <br />also included. <br />We understand that this road will be approximately 500 to 700 feet in length. The access road will <br />generally be limited to pickup traffic and ocrasional delivery trucks or construction vehicles. <br />Subsurface Conditions: A formal field investigation was not completed for this project; however, our <br />fu-m made a number of visits to the project site during the construction of the Batch Load Out Facility. <br />Based on our observations of the adjacent cut slopes and our experience with the soils at the Batch <br />Load Out Facility, it appears that the subgrade soils encountered along this roadway will generally <br />consist of clays and highly weathered claystone bedrock. <br />Pavement Recommendations: The subgrade sails encountered along the proposed roadway will be <br />somewhat variable and generally consist of clays and weathered claystone bedrock. These materials <br />typically classify as A-7-6 to A-6 soils in accordance with the American Association of State Highway <br />Transportation Officials (AASHTO) classification system. Using the group index values obtained on <br />similar subgrade soils, a correlated soils resilient modulus of 5,000 psi was used in the design process. <br />I[ is our understanding that the subject roadway will be used as an access road which will generally be <br />subjected [o very low traffic volumes, generally consisting of pickup trucks. Therefore, we have <br />. assumed an 18 kip equivalent single axle loading (ESAL) of 6,500 for the access road <br />(970) 879.7888 • Fax (970) 879.7891 <br />29585 U.S. 40 West, Box 775226 • Steamboat Springs, CO 80477 ~R~Co <br />