PERMFILE42596 - Laserfiche WebLink

Home Browse Search

Section 816.152 (d) Continued. Kerr Coal will use its own equipment to construct the Class I Roads. The subgrade will be proof compacted and any deleterious or unsound material will be removed. Road fill material will be spread with motor graders and compacted over the entire width of the embankment, as follows: (i) Where there is more than 5 feet of fill, the top 5 feet will be compacted to 95X of AASHTO T-180 and the rest will be compacted to 90X of AASHTO T-180; (ii) Where there is leas than 5 feet of fill required, the entire fill will be compacted to 95% of AASATO T-180; provided, however, that in all cases there will be a minimum of 2 feet of compacted road fill; and (iii) Where the road is in a cut, the roadway will be over- excavated and a 2 foot minimum thickness road fill placed and compacted to 95X of AASHTO T-180. Professional engineers will monitor the' embankment construction and will use both nuclear densometers and observations to assure good compaction. The road- . way foundation and fill thickness were designed based upon the soil properties and the method outlined in the Bureau of Mines Informa- tion Circular, IC 8758, 'fiesign of Surface Mine Aaulage Roads - A Manual." Existing roads will be crowned at a minimum rate of 1/4 inch per foot. New roads will be crowned at the rate of approximtely 1/2 inch per foot. All material to be used in embankments has been thoroughly tested and has been found suitable for roadway construction and contains no acid producing material. The chemical analysis of the fill material is found in Table 4, Statistical Description of Overburden Chemical Data. In addition, the structural and foundation analysis done on the proposed road embankment is found in Exhibit 47, Road Embankment Analysis. The results show the designed 2:1 fill slopes to exceed the required 1.25 safety factor for slope stability. Any material encountered during excavations that does not meet the 816-187