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eh ESPEY HUSTON &ASSOCIATES. INC. <br />r <br />U <br />excavation methods may be used from 7 + 00 to 19 + 00. Material beyond that <br />required to bring the lowside to the required height will be used for roadway <br />embankment if suitable or will be placed in the disposal area and handled as refuse <br />(30 CFR 817.43(f)(4)). Dry rubble or rock riprap will line the channel from <br />Sta 19 + 50 to the point of dischazge into Curtis Creek in only those azeas requiring <br />it. The section of the ditch which is not to be riprapped will be protected by <br />vegetation. Topsoil will be placed on the banks of the ditch as necessazy to allow <br />this vegetation. Preliminary indications aze that the natural material at this depth <br />will support vegetation. A culvert, as discussed in Sec. 13.3.5, will be placed in the <br />diversion ditch at Sta 4 + 80 - 5 + 50 to allow the crossing of the power sub station <br />access road (see detail, Fig. 13.3.5). <br />13.4.1.4 Roadway Construction <br />Vegetative material will be removed from the road bed and shoulders and <br />• the topsoil will be removed as specified in Sec. 13.4.1.1 (30 CFR 817.162(e)). The <br />roadway (see Figs. 13.3.6 and 13.3.7) is entirely above existing grade. The embank- <br />ment will be constructed with material borrowed from the pond azea as it is <br />available. Should that prove insufficient, waste rock material from the mine may be <br />used to the extent that it meets requirements of 30 CFR 817.163(d)(11). The <br />embankment material will be placed in lifts not to exceed 12 inches uncompacted <br />thickness or of thickness equal to the average diameter of rock used which ever is <br />greater. Rock shall not be dumped into final position but shall be bladed or dozed in <br />a manner that will ensure that voids, pockets and bridging aze minimized. The final <br />layer will consist of no more than 25% of rock exceeding six inches in greatest <br />dimension (30 CFR 817.162(d)(3) and (4)). Each layer of the embankment will be <br />completed, leveled and compacted before the next layer is placed. The material <br />shall be leveled as placed and kept smooth. The successive layers shall be <br />compacted by routing the hauling and leveling equipment aver the entire width of <br />the embankment. This procedure will be continued until no visible horizontal <br />movement of the embankment material is apparent (30 CFR 817.162(d)(5)). <br /> <br />13-14 <br />