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eh <br />ESPEY. HUSTON & ASSOCIATES. INC. <br />• <br />about 1 mile long and closely follow an existing mine access road. According to <br />30 CFR 701.5, this road is classified as a Class I road, and the road has been <br />designed in conformance with the 30 CFR 817.150 through 817.153 were used as a <br />guide in the design. The haul road has been designed by International Engineering <br />Company, Inc. to OSM Class I Surface and Drainage performance standards. The <br />design and drainage of the road along with the cross pan design is presented in the <br />following paragraphs and Exhibit C-13. Att, Fiw ~pR THE REAR C9ME FR9+N, Zkc <br />~~~DIM'TE AREA AND Q.0 Isar ~goteF (~}a:nnn~tlc~t, TeS~,r~,. Ai.L I,~Px i/~~ls ~e~ <br />W .ltc.colLORNCE WITH eo>.oRROp DIUiSION 9F t{i6e1wRYS .MY.S S'TAabR(~~ qan ALL <br />CoM.AneTloa M1t"T /}A5NT0 T99. <br />3.5.1.1 Design <br />The road slopes downwazd from the State Highway to Curtis Creek and <br />slopes upward from Curtis Creek to the mine site. Parabolic vertical curves were <br />used extensively to conform to the existing grades. <br />• The road will be crowned to facilitate roadway drainage. A 2 percent <br />side slope from the centerline (~-inch fall per foot) was used. Since the height of <br />the embankments of the road are very low, the road runoff has been allowed to run <br />directly down the fill slopes. Where cuts aze encountered, a ditch is to be <br />constructed is the area of the cut which will discharge onto natural terrain. <br />The existing road has several culverts for cross drainage and these <br />culverts aze, to remain in place. No new or additional culverts aze necessary <br />between the State Highway and the mine site area. All culverts, however, shall be <br />protected by rip rap. Calculations to deronstrate that these culverts are correctly <br />sized for an estimated 10-year, 24-hour runoff can be found in E~chibit C-17. <br />The road will be 24 feet wide from the State Highway to the coal loading <br />azea. At this point the road splits into cone-way coal loading loop which is 12 feet <br />wide. <br />L_J <br />C-44 <br />~j/ 7~i <br />