2008-09-18_REVISION - M1978091UG

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compacted down to a total depth of l foot with the use of heavy equipment Top soil retained -- - - - - along the perimeter of the pad, and as part of the road berm will be smoothed over the alluvium surface. The entire face of the waste rock storage area will be re-seeded using the appropriate BLM approved seed mix (refer to Figure B3). The seed willbe applied in Spring and Fall seasons - - - cntil adequate re-vegetation is achieved. • Storm water channels (both run-on and run-off) will be constructed to minimize the potential for storm water contact with the encapsulated waste rock. A run-on channel will traverse the upper edge of the waste rock repository, while a run-off channel will be constructed at the toe. The run-off channel will be designed to control water energy with the use of large cobble to boulder-sized materials. The purpose of this feature is to control water energy and allow for sediment fall-out. • Revegetation and stormwater conditions will be monitored to ensure compliance and successful revegetation endpoints. gbe resulting waste rock repository will blend with the surrounding topographic contours. The -- - rite rock will be retained within an encapusulated cell comprised of top soil and non-reactive - - -- - - alluvium. The top soil will have been taken from the repository cells created to contain'the topsoil salvia ed during future disturbance activities (refer g to Figure B.3). The underlying --- - - - alluvium the waste rock, and the alluvium cap will be compacted. This will assist with shedding' of any stormwwater. In addition, the run-on channel will intercept any storm water that maybe traveling down-slope towards the waste rock storage. The runoff channel will. capture any sheet flow coming off the waste rock storage. These channels will have large unconsolidated nonce-reactive materials to attenuate and dissipate flow energy aRd decrease ootnote (a) Description of Waste Rock Volume Estimate Methods Eetailed topographic survey of the Golden Wonder Mine Level 6 pad area was performed on - - - - ay 5, 2008 (refer to Figures BA and B.5). The survey was performed using a robotic total - --- =- - --- -- - - -- - - - ---- -- station using an arbitrary elevation datum and arbitrary local grid coordinates They survey coverage included the pad area, the waste rock pile, about 350 feet.p of the road centerline from `the port hole and to the north,-the Deadman Gulch stream bed fora distance of about 80 feet upstream of the high wall and about 75 feet downstream of the toe of the waste rock-pile- and the xisting bypass ditch In addition a portion of the hillside areas were surveyed for a distance of were - abo 1o t00 feet east of the high wall, about 100 feet northwest of the waste rock pile and about 5Q southwest of the waste roc eath the waste rock pile was estimated e historic Deadman Gulch stream bed alignment undern by extrapolating a line'from the existing alignment upstream and downstream of the waste rock pile. -Historic surface topography underneath the waste'rock pile was estimated by( xtrap ol g 11