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4 <br />• ~ <br /> <br /> <br />Geote<hnical I Environmental Engineering • Materials Testlng <br />Subject: Roadway Certification Letter, Batch Weigh <br />Loadout Haul Road, Foidel Creek Mine, Routt <br />County, Colorado. <br />Gentlemen: <br />November 6, 2002 <br />RECEIVED <br />APR 2 4 2003 <br />Division of Minerals and Geology <br />RAG - Twentymile Coal Company <br />29815 RCR #27 <br />Oak Creek, CO 80467 _ <br />Attn: Mr. Rick Mills <br />Job Number: 02-5023 <br />1, Brian D. Len, a registered professional engineer, registry number 28780, in the state of Colorado, certify that the <br />Batch Weigh Loadou[ Road was constructed and surfaced in general accordance with our previous <br />recommendations, outlined in a report prepared under this job number and dated May 16, 2002. The project <br />consisted of the construction and surfacing of approximately 500 lineal feet of the haul road with subbase and base <br />course gravels. <br />During the period of September 11, 2002 through October 18, 2002 our firm made four periodic visits to the subject <br />site to verify that the embankment fill materials and subbase and road base gravels were placed and compacted to at <br />least 95% of the modified Proctor density determined in accordance with ASTM D1557. We also verified that the <br />contractor had placed the minimum required thickness of subbase and base course gravels. The depths of the gravel <br />layers were verified during the periodic site inspections and at the time the compaction tests were taken. Based on <br />our measurements, it app that the subbase gravels ranged from 6 to 8 inches in thickness and the base course <br />gravel layer ranged fro 5 t 6 inches in thickness. Copies of our daily inspection reports, including the compaction <br />test results are enclos d. <br />If you have any gl(es ons regarding this certification report, or if we can be of further service, please contact this <br />office. / <br />INC., <br />(970) 879-7888 • Fax (970) 879-7891 • nweeaQemn.net <br />2580 Copper Ridge Drive • P.O. Box 775226 • Steamboat Springs, CO 80477 <br />