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o t.onsuitants.inc. <br />Geotechnical l Environmental Engineering • Materials Testing <br />May 30, 1996 <br />Twen[ymile Coal Company <br />29515 RCR #27 <br />Oak Creek, 80467 <br />Attn: Mr. Rick Mills <br />Subject: Roadway Certification Letter, PM Bay <br />Access Road, Foidel Creek Mine, Routt County, <br />Colorado. <br />Gentlemen, <br />I, Brian D. Len, a registered professional engineer, registry number 25750, in the state of Colorado, certify that <br />the PM Bay Access Road was resurfaced in accordance with our recommendations outlined in Exhibit 25H. <br />• The contractor resurfaced approximately 1700 to 1800 lineal Feet of roadway. The portion of the roadway <br />resurfaced started approximately 100 east of the west end of the roadway and terminated at the western most <br />warehouse building situated towards the east end of the road. <br />We inspected [he subject roadway during a period of May 16, 1996 through May 28, 1996 to verify [ha[ the <br />subbase and road base gravels were placed and compacted [o at least 95% of [be modified Proctor density <br />determined in accordance with ASTM D1557. We also verified that the contractor had placed the required <br />amount of subbase and base course gravels, 8 inches and 6 inches, respectively. <br />The contractor had placed a 12 to 18 inch [hick layer of subbase gravels over the existing gravels and a 6 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 96 to 100 percent of the maximum modified Proctor density. <br />If you have any questions yarding this certification, or if we can be of Further service, please contact this <br />office. // <br />Sincerely, <br />NORTHWFSr <br />Brian D. Len, P <br />• <br />(970) 879.7888 • Fax (970) 879.7891 ,~R ~~ <br />29585 U.S. 40 West, Box 775226 • Steamboat Springs, CO 80477 <br />