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Ms. Candace Thompson <br /> *November 26 , 1986 <br /> Page - 2 <br /> accomplish at least 75% of their rated work capacity. In <br /> some steep and restricted areas we have been calculating <br /> their work capacity at 50% . In the tunnel, wash plant, and <br /> Sutey disposal areas we are convinced that 75% of rated <br /> capacity is a valid figure. <br /> We will compute the cost of replacing the 700 cu. <br /> yds. of topsoil that will be removed from the site and <br /> stored at the tunnel refuse area topsoil pile. We will also <br /> calculate the cost of demolishing the new lamphouse building <br /> on the portal pad. <br /> Our recalculations of the reclamation costs of the <br /> tunnel pad expansion, based on the above considerations are <br /> as follows : <br /> Since MLRD is requiring that this fall material be <br /> moved back to the portal areas to obtain a 100 ' buffer zone <br /> from Dutch Creek, not all the fill needs to be removed. Our <br /> calculations, based on the fill cross-sections , are that by <br /> moving 2/3 of the fill material we can accomplsih the 100 ' <br /> buffer zone requirement and maintain a 2 to 1 slope grade. <br /> Therefore, we would need to move 13 , 500 cu. yds . of fill an <br /> average distance of 400 ' . According to the estimated dozer <br /> production chart for an 8S dozer on page 42 of The Cater- <br /> pillar Performance Handbook, a D-8 dozer can move 375 LCY/Hr <br /> a distance of 400 feet. To account for a reasonable efficiency <br /> correction factor of 75% we will reduce the 375 LCY/Hr to <br /> 280 LCY/Hr. <br /> 13 , 500 cu. yds <br /> 280 LCY/Hr 48 Hours <br /> 48 x 118 = $5 , 664 Grading cost <br /> Replacing topsoil will require moving the 700 cu. <br /> yds . that will be saved a distance of 600 feet from the rock <br /> tunnel topsoil storage area. Utilizing a 966 D Loader, two <br /> 12 yard dump trucks and a D-8 dozer the job can be accomplished <br /> as follows : <br /> 2 Trucks (240 CYH) , 700 <br /> 240 = 3 Hrs , make it 4 <br /> 4x2x44 = $352 <br /> Loader - 4 x 68 = $272 <br /> D-8 4 x 118 = $352 <br /> Total $976 . 00 <br />