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<br />In 1980 CMLRD requested Sun Coal to submit a surface water control plan in <br />• order to comply with new state regulations promulgated pursuant to the <br />Surface Mine and Reclamation Control Act. Ditches, culverts, a~ runrnrts <br />were constructed in 1981 in accordance with an approved modified haul road <br />drainage plan. <br />Awes, Road <br />- Road Slu~facirg <br />Road surfacing criteria recommended by Robert W. Thompson in 1977 and <br />believed to be used during access road construction are as follows: <br />"The latest information supplied to us indicates the proposed haul <br />road is to be an aggregate surface pavement designed to support 25 to <br />30 ton payload rear dump trucks. ... Research indicated that most <br />mining opertions utilize a "cut and try" method for design" and <br />was used during the construction of Sun Coal Company's haul road. <br />...a CBR value of 11.0 and the U.S. Forest Service design method for <br />aggregate surfaced pavements, a m;nim~m, pavement section of 14 inches <br />of Class 6 base course was determined. ...Based upon our analyses, <br />we suggest the use of a ca~osite pavement section consisting of a 2 <br />foot section of compacted subgrade overlain by 14 inches of Colorado <br />Department of Highways Class 6 base course material with added <br />• binder. Design and oon~truction reccamerdations given belay should <br />be followed: <br />1. Slibgr-ode should be stripped of all organic materials, scarified, <br />moisture treated and compacted to a depth of at least 2 feet. <br />The mini~mim specified Compaction should be equal to 95 percent of <br />maximtun modified Proctor Density (ASTM D-155T). <br />2. A wearing surface consisting of at least 14 inches of Colorado <br />Department of Highways Class 6 base course should overlie the <br />compacted subgrade. This material should be adjusted to have <br />between 12 and SSAS passing the No. 200 sieve. The material <br />should be laid in loose lifts not exceeding 6 inches in thickness <br />and compacted to at least 95 percent of modified Proctor density <br />as determined in accordance with ASTM D-1557. <br />3. Once the pavement section has been installed, a regular program <br />of maintenance should be developed and strictly followed. The <br />maintenance should consist of the following: <br />Regglar blading operations <br />During hauling snow should be removed during the winter <br />months <br />• Control fugitive dust by wetting during dryer portions of <br />the year <br />- 211 - (Rev. 5/86) <br />