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2.2-7 <br />Embankment material will be placed in layers of uniform thickness <br />and compacted by the machinery used in construction. These layers <br />shall vary in thickness from 12 inches to 36 inches. Efforts will <br />be made to use large size material in the lower lifts. Moisture <br />content shall be maintained at levels necessary to insure that <br />stability is achieved. No acid or toxic forming material will be <br />used in r_onstruction. <br />Two of the fill areas required for construction will encroach upon <br />the Munger Creek Tributary. These fills are at approximate Stations <br />85+00 and 95+00 and are shown in Figure 2.2-22. Culverts sized for <br />a 25 year, 24 hour storm event will be placed within these fill <br />areas. GVC will also scarify and seed those portions of the <br />existing haul road not on the design road alignment. <br />No sub-base shall be placed when the sub grade is frozen or when it <br />is sufficiently wet to create problems due to movement of <br />construction equipment. Each layer of aggregate base shall be <br />compacted by rubber tired or smooth drum compaction equipment of <br />adequate weight and size until the dry density of the compacted <br />material is not less than 95 k of the laboratory maximum dry density <br />as determined by the Standard Proctor Compaction Test, ASTM <br />Designation; D698-70, Method A. <br />Water shall be uniformly applied over the sub-base materials during <br />compaction in the amount necessary for proper consolidation. The <br />• surface of the sub-base shall be bladed and maintained in s <br />satisfactory and smooth condition until it is covered by bituminous <br />pavement, see Table 2.2-1. When the final configuration end <br />compaction is complete, the road will be paved and guard rails <br />constructed. <br />Ditches and culverts constructed to control drainage shall be <br />designed to pass the flow from a 10 year 24 hour precipitation <br />event. Ditches will be constructed on the inside shoulder of road <br />in fill areas and on both sides of the road through cut areas. <br />Runoff rates were calculated for the seven watershed areas shown in <br />Figure 2.3-4. These rates were calculated by R. V. Lord & <br />Associates and are shown in Appendix M(i). These rates were used to <br />size the culverts to pass these flows underneath the haul road. <br />Culvert locations are shown in Figures 2.2-16 through 2.2-23 and <br />2.3-4. All culverts will be covered with a minimum of one foot of <br />compacted material and constructed to withstand the pressures <br />associated with soils and the vehicular traffic. Erosion control <br />features will be provided at the inlet end of all culverts to <br />provide necessary protection. Erosion control will be provided by <br />flared end sections. <br />.. <br />Wv 'o~J <br />- •, ,~ ; ,~ <br />. <br />