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Geotechnical I Environmental Engineering • Ma[erlals <br />September 30, 1996 <br />Twentymile Coal Company <br />29515 RCR #27 <br />Oak Creek, 80467 <br />Attn: Mr. Rick Mills <br />Subject: Roadway Certification Letter, Refuse Pile <br />Haul Road, Foidel Creek Mine, Routt County, <br />Colorado. <br />Gentlemen, <br />I, Brian D. Len, a registered professional engineer, registry number 75750, in [he state of Colorado, certify that <br />the Refuse Pile Haul Road was resurfaced in accordance with our recommendations outlined in Exhibit 25F. <br />The contractor resurfaced approximately 2000 lineal feet of roadway. <br />• We inspected the subject roadway during a period of April 4, 1996 through May 8, 1996 and on September 5, <br />1996 to verify that the subbase and road base gravels were placed and compacted [o a[ least 95% of [he <br />modified Proctor density determined in accordance with ASTM D1557. We also verified that the contractor <br />had placed [he required amount of subbase and base course gravels. <br />The contractor had placed a 16 inch thick layer of subbase gravels over the existing gravels and a 4 to 5 inch <br />thick layer of base course gravels over the pit run gravels. The subbase and base course gravels were gravels <br />and were compacted from 95 to 100 percent of the maximum modified Proctor density. <br />If you have any questions r^egarding this certification, or if we can be of further service, please contact this <br />office. / / <br />Sincerely, <br />NoannvESr <br />Brian D. Len, <br />• <br />(970) 879.7888 • Fax (970) 879-7891 <br />29585 U.S. 40 West, Box 775226 • Steamboat Springs, CO 80477 -rte oZfo <br />