2010-04-16_PERMIT FILE - C1996083A (9)

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• 2.05.3 • n LJ MR-97 Conveyor Underpasses Three conveyor underpasses were constructed for the downhill conveyor project. One is located on the portal bench. The second is located immediately below the downhill conveyor transfer building. The third is located about midway along the downhill conveyor and will serve as a wildlife overpass. A fourth conveyor underpass was constructed to provide haul road access over the downhill conveyor to the B -Seam portal bench. The underpasses are 9 -foot diameter multi -plate and are approximately 100 -feet long. The B -Seam conveyor multi -plate underpass is approximately 60 -feet long supported on concrete footers as shown on Map 38. A 3,400 face square foot retaining supports the road up to and over the multi - plate. The retaining wall is reinforced with Tensar geogrid and faced with decorative concrete block. Water Treatment Buildinq A small (10'X10') water treatment building located northwest of Pond C used to add CDPS approved chemicals to the water as necessary for clarification. Bent Protectors Two concrete bent protectors located at the coal stockpile level. One is three sided with 20 feet high walls, 42 feet long and 16feet wide. The other is a four sided structure with 28 foot average height walls, 48.5 feet long and 15.5 feet wide. The four sided structure has a metal roof. Rock Bins Concrete bins located at the B- Bench. The concrete base is 20 feet by 30 feet. The 8 foot high walls are 40 -feet long Retaining Wall Concrete retaining wall located at the B- Bench. The 8 -foot high retaining wall is approximately 50 -feet long. Hubbard Creek Shaft See Map 39 for the location of the ventilation shaft that was constructed during 2007 and 2008. It is lined with steel and has a finished diameter of 10.5 feet. The steel liner was cemented in place. Prior to drilling, the perimeter of the shaft was grouted to minimize water infiltration. Grouting was extensive in the collar area and was reduced when the shaft alignment encountered solid rock. The shaftwas blind bored the entire depth of approximately 500 feet. The cuttings removed from the shaft are considered underground development waste and were therefore hauled to one of the approved gob disposal areas. Emergency Escape System During 2009 the Operator will install an emergency escape system over the Hubbard Creek Shaft. The hoist is 20 -feet long, 8 -feet wide and 9 -feet tall. The hoist foundation consists of six 5.5'X 5.5'16" thick spread footings with 4 -foot tall 18 -inch diameter piers. The head frame has a 20 -foot square base, is 3 -feet by 12 -feet at the top and is 27 -feet tall. The head frame will be bolted to the existing shaft collar. 2.05-16- 03/09