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<br />~~ <br />the number 200 sieve. The rockfill should have awell-graded gfain <br />size distribution and length of individual particles should not exceed <br />three.times the width. <br />Western -Fads proposes using waste rock comprised of sandstone <br />generated during mining. We believe this rock type is suitable for the <br />proposed structure as long as the gradations listed above are adhered to <br />during constmction. We a~cipate that some mechanical breakdown <br />will occur during handbag, Modification of blasting patterns presently <br />being used may be necessary in order optimize the gradation of the <br />rockbll material. <br />3.3 COltSTSOCRION <br />• <br />• <br />/li <br />t .~ <br />~, <br />REVISED MARHC 2006 <br />The fill shall be maintained approximately horwntal throughout the <br />entire length. Rock511 material shall be dumped so as to provide the <br />best practical distribution of the material. The material shall he <br />dumped on top of the loose lift being constructed and spread m the <br />edge of the lift usiog a bulldozer or other bladed equipment Material <br />should be spread across-the loose lift so as m fill the voids with the <br />finer material in the rockfill. The loose lift should have a rehttivdy <br />smooth surface without large protruding rocks so effective compaction <br />can be aclieved. Larger rocks should be pushed towards the outer <br />slope and oversizui rocks should be pushed wmpletely to the edges of <br />the fill. Water shall be added generously to assist with compaction of <br />the fill. The amount of water used should be at least 20% of the <br />volume of rock <br />If the 90.toa haul tmeks are used for rnmpactioq rockfill shall be <br />placed in horizontal layers (lifts) not exceeding 18 inches in thickness. <br />If wmpaction is m be achieved using a vibratory steel drum roller with <br />a minimum static weight of ] 0 tons, lift thidmesses can be increased to <br />24 inches using the same procedures as outlined above. Lift thickness <br />may be varied once construction begins with the approval of a mpresen- <br />tative of our firm. A minimun of four compaction passes covering the <br />entire lift shall be completed, each pass overlapping a minimum of 1 <br />foot Mom passes may be required at the request of our oh-site <br />observer. <br />Attachment 2.05.3(3)9- 5 <br />Attachment 2.05.3(3)-9-6 <br />