Laserfiche WebLink
.- <br />• <br />~Ms. Kathy Welt <br />July 19, 1995 <br />Page 2 <br />the load (coal or coal refuse) rather than the weight or frequency of the vehicle. The access <br />road design was evaluated based on the assumption that the heaviest vehicle would not exceed <br />a standard H-20 l20 ton truck) vehicle per current State Highway Specifications. Spec <br />vehicle design criteria is listed in the 1983 Operations and Maintenance Manual which Merrick <br />& Company prepared for ARCO Coal Company. <br />Merrick & Company's evaluation is based upon a review of the original design as well as the <br />project record documentation provided by ARCO Coal Company personnel and shown on the <br />1983 Project Record Documents. <br />Observations noted included that the road was constructed per the original approved plans and <br />specification with slight modifications. These included some grade modifications from Section <br />8+00 to 20+00 in order to account for soil cuts rather than rock cuts. In addition, over most <br />of the road the base course thickness was upgraded to 12' thickness on a Miraf( 600X <br />stabilization fabric. This was done to account far lower CBR subgrade strengths found in the <br />field. A 2' overlay was originally specified at the end of the five (5) years of use. It is our <br />understanding that this was installed soon after the opening of the mine (around 19831. <br />The constructed access road design meets the requirements of CDMG Section 4.03.1(3), <br />involving maximum grades, drainage and traffic requirements. <br />The road complied with prudent state-of-the-art requirements for road design in semi- <br />mountainous conditions. Per the Project Record Documents, the road complied with approved <br />Permit No. C-80-007 as originally approved July, 1981. <br />N you have further questions, please contact me. <br />Sincerely, <br />r <br /> ~;~. F Rq2 <br /> P <br />G~STEy •• <br />O. <br /> ~ <br />~ ~~ <br /> ~: 15005 <br /> f <br />~'~ <br /> .,r~CHAI EvG~ <br />Ifl ' <br />qlE OF COI~?a~ <br />MERRIC & COMP <br />Dav .Frazier, .E. <br />Project Manager <br />DAF/kvj <br />ec: Kent &ogger <br />I.yll Ii1AV ML fl11W O11 W W 6T.71 • <br />