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ortnrvest t,oloraao t.onsuitants. inc. <br />Geo[echnical I Environmental Engineering • Materials Testing <br />September 30, 1996 <br />Twentymile Coal Company <br />29515 RCR #27 <br />Oak Creek, 80467 <br />Atm: Mr. Rick Mills <br />Subject: Roadway Certification Letter, Poud A <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 [hat <br />the Pond A Access Road was resurfaced in accordance with our recommendations outlined in Exhibit 251. The <br />contractor resurfaced approximately 3600 to 3800 lineal feet of roadway. The portion of the roadway resurfaced <br />• started approximately at the Batch Load Out Facility and terminated at the pump house at the south end of the <br />road. <br />We inspected the subject roadway during a period of March 27, 1996 through March 29, 1996 and from August <br />21, 1996 to September 5, 1996 [o verify [hat the 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 [hat <br />the contractor had placed the required amount of subbase and base course gravels <br />Originally, the contractor had placed a 12 to 14 inch thick layer of subbase gravels over the existing gravels and <br />a 6 to 7 inch thick layer of base course gravels over [he pit run gravels for the northern 2,000 fee[ of [he <br />roadway. After the dragline was removed, the the contractor had placed a 8 to 10 inch thick layer of subbase <br />gravels over the existing gravels and a 4 [o ~ inch thick layer of base course gravels over the pit run gravels for <br />the southern 1,700 feet of the roadway. The subbase and base course gravels were gravels and were compacted <br />from 95 to 100 percent of the maximum modified Proctor density. <br />If you have any questio~shegarding this certification, or if we can be of further service, please contact [his <br />office. I / <br />Sincerely, <br />HORTHWFST <br />• <br />Brian D. Len, P.E. <br />(970) 879-7888 • Fex (970) 879.7897 <br />29585 U.S. 40 West, Boz 775226 • Steamboat Springs, CO 80477 ~'R ~(o <br />