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oioraao <br />Gea[echnical / Eneironmenol Engineering • Materials <br />December 12, 1996 <br />Twentymile Coal Company <br />29515 RCR #27 <br />Oak Creek, 80467 <br />At[a: Mr. Rick Mills <br />Subject: Roadway Certification Letter, Batch Load <br />Out Access Road, Foidel Creek Mine, Routt <br />County, Colorado. <br />Gentlemen, <br />\J <br />I, Brian D. Len, a registered professional engineer, registry number 25750, in the state of Colorado, certify that <br />the Batch Load Out Access Road was surfaced in accordance with our recommendations outlined in Exhibit <br />25L. The convactor surfaced approximately 600 to 700 lineal fee[ of roadway. The portion of the roadway <br />surfaced started at the old loading facility and terminated along the south side of the new loading facility. <br />We inspected the subject roadway on November 25, 1996 to verify that [he subbase and road base gravels were <br />placed and compacted to a[ leas[ 95% of the modified Proctor density determined in accordance with ASTM <br />D1557. We also verified [hat the contractor had placed the required amount of subbase and base course <br />gravels, 8 inches and ~ inches, respectively. <br />The contractor had placed a 10 inch [hick layer of subbase gravels over the natural soils and a 4 to 6 inch thick <br />layer of base course gravels over the pit run gravels. The subbase and base course gravels were gravels and <br />were compacted from 95 to 96 percent of the maximttm modified Proctor density. <br />If you have any ques[ions~rcgarding this certification, or if we can be of Further service, please contact [his <br />ofFce. <br />Sincerely, <br />NORTHWEST <br />Brian D. Len, P.E. <br /> <br />(970) 879.7888 • Fax (970) 879.7891 <br />29585 U.S. 40 West, Box 775228 • Steamboat Springs, CO 80477 _R a6 <br />