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/ EnvironmerHal Engineering • Materials <br />July 23,1997 <br />Twentymile Coal Company <br />29515 RCR #27 <br />Oak Creek, CO 80467 <br />Attn Mr. Rick Mills <br />Job No. 97-3145 <br />Subject: Pavement Rewmmendations, <br />Main Entrance Road and Parking Lo[, <br />Foidel Creek Mine, Routt County, <br />Colorado. <br />Dear Rick, <br />Per your request, we have completed the pavement design for the Main Entrance Road and Parking <br />Lot at the Foidel Creek Mine in Routt County, Colorado. It is our understanding that the roadway and <br />parking lo[ will be paved with asphalt [his summer. <br />~f S-3 <br />. We have assumed that the main eatrance roadway will be subjected [o traffic loadings consistent with <br />the loadings on RCR #27 and that the majority of the parking lo[ will typically be used far automobile <br />parking. The east end of the parking area will occasionally be used to unload delivery trucks and will <br />be subjected to truck traffic and heavy equipment during these unloading operations. <br />~1 <br />LJ <br />Subsurface Conditions: The subsurface conditions were investigated by advancing a number of <br />shallow test holes with struck-mounted drill rig utilizing 4 and 6 inch diameter continuous Flight power <br />augers. Three test holes were drilled in [he parking areas (P-1 to P-3) and five test holes (P-4 to P-8) <br />were drilled along [he entrance road at approxima[ety 100(1 Coot intervals. The subsurface conditions <br />encountered at the site were fairly uniform and generally consisted of 2 to 4 feet of road base materials <br />overlying natural clays and clay fill materials. The location of [be test holes, [he depth of road base <br />materials encountered in the holes and the underlying subgrade soil type are shown in the following <br />table. <br />Hole Number Location Road Base Depth Subgrade Soil <br />P-1 Parking Lot-1st Row 24" Clay <br />P-2 Parking Lot-3rd Row 30" Clay <br />P-3 Parking Lot-5th Row 24" Clay <br />P-4 Entrance Road @ Office 48" Clay <br />P-5 Entrance Road-0.2 miles A7E 36" Clay <br />P-6 Entrance Road-0.4 miles NE 30" Clay <br />P-7 Entrance Road-0.6 miles NE 30" <br />P-8 Entrance Road-0.8 miles NE 36" <br />Clay <br />Clay Fill <br />(970) 879.7888 • Fax (970) 879.7891 • nwcel Qmindspring.com <br />2580 Copper Ridge Drive • P.O. Box 775226 • Steamboat Springs, CO 80477 <br />