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WilY 29. 2009 puge 20 <br />tracking in sonle waste rock to firm up the subgrade before drain construction. This explains <br />how there can he a water feature without a continuous source of flowing water. <br /> <br />Figure 31). l nderdrain Outlet Area with Projected Sandstone Bedrock Contact <br />While the modeling shows long-tern/ stability of the final till, the relatively steep natural <br />slope of I lorse Gulch may cause localized instability during, the Initial fill placement, depending <br />on the orientation of the till and the method of placement. -rherefore AAI reconlnlends that <br />' areas with slopes greater than ?.811:1 V be benched into formational bedrock, the mulullU111 <br />benching extents are shown in Figure 31. Generally in these steeper sloping areas the material <br />below the topsoil is formational bedrock; there is little to no clay, unlike the shallower slopes <br />' near the valley floor. The benching will result in the same overall slope as the slope without the <br />topsoil; however, 5-ft-deep "stair steps" will be cut into the formational bedrock to increase the <br />' effective friction between the spoils and the country rock. The bench geometry criteria is <br />presented in Appendix A. <br />' ;CAI and TNIII will work together to insure that the construction is inspected at all key <br />phascs. The inspections should he at least quarterly during the following critical construction <br />phase. Inspections shall meet the following requirements as directed by the Regulations of the <br />' (olor.ulo Mined Land Reclamation Board for Coal Mining (1980, page 30?, Section 4.09.01 <br />I r) The till.vhull he irt.cl)ec'tcc!/i,r stuhilit.l' 1) v a rgvislcrecl ellgirree?• or other yuctlilieel <br />' IrroJCSSio?tul q)(viulist e.yer•iencec! in c•ort.ctruc•tiorr of earth ctrl/ rocklill <br />ClOanknx°ws mider• the direction of ei ytrnli/icc/hrul?.?siortul ela irrecr tit leust <br />Agapito Associates, Inc. <br />.':T ? ? • ice! ' .,, .. ?'?.? ?? ` ? ?. ; u a ? \ <br />' -?' ?_`?.? ?-.:.tip. `ti?l?y•\' .