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Geomchnical l Environmental Engineering • Materials Testing <br />August 14, 1996 <br />Twentymile Coal Company <br />29515 RCR #27 <br />Oak Creek, CO 80467 <br />Attn: Mr. Rick Mills <br />Job No. 95-2431 <br />Subject: Roadway Design Verification, Refuse Pile <br />Access Road, Foidel Creek Miue, Rout County, <br />Colorado. <br />Gentlemen, <br />As requested, Northwest Colorado Consultants, Inc. bas prepared this report verifying the design of the <br />secondary access road being constructed into the Refuse Pile at the Foidel Creek Mine in Rout[ County, <br />• Colorado. <br />We visited the project site on August 12, 1996 to observe the construction of the secondazy access road being <br />constructed west of the previously constructed access road. At the time of our visit, the contractor had installed <br />a culvert pipe in the existing drainage way and had backfdled the pipe and roadway to [he proposed grades. <br />Three compaction tests were taken on the fill materials and the results indicate that the fdl materials were <br />compacted from 93 to 95 percent of the maximum modified Proctor density determined in accordance with <br />AASHTO T180. The compaction and proctor test results are attached. <br />Based on our observations made at the site and the compaction test results, it appears that the haul road was <br />generally coostruc[ed in accordance with the rules and regulations 4.03.1 (3) parts E and F. <br />• <br />Brian D. Len, .E. <br />~_ <br />Based on [he subgrade soil conditions, we recommend [he roadway be surfaced with a minimum of 16 inches of <br />pit run gravels and 4 inches of base course. These materials should be compacted to at least 959'0 0l the <br />modified Proctor density determined in accordance with ASTM D1557. <br />Ef you have anv gsestions F~garding [his report, or iF we can be of further service, please contact this office. <br />Sincerely, ,' <br />NORTHWEST C~Lt <br />'~tinf~~t9"I9.7888 • Fax (970) 879.7891 <br />29585 U.S. 40 West. Box 775226 • Steamboat Springs, CO 80477 <br />