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2.05.3 <br />Retaining Wall <br />Concrete retaining wail located at the B- Bench. The 8 -foot high retaining <br />wall is approximately 50 -feet long. <br />Hubbard Creek Shaft <br />See Map 39 for the location of the ventilation shaft that was constructed <br />during 2007 and 2008. It is lined with steel and has a finished diameter of <br />10.5 feet. The steel liner was cemented in place. Prior to drilling, the <br />perimeter of the shaft was grouted to minimize water infiltration. Grouting <br />was extensive in the collar area and was reduced when the shaft alignment <br />encountered solid rock. The shaft was blind bored the entire depth of <br />approximately 500 feet. The cuttings removed from the shaft are considered <br />underground development waste and were therefore hauled to one of the <br />approved gob disposal areas. The Hubbard Creek shaft has been backfilled <br />and capped. <br />Emergency Escape System <br />During 2009 the Operator installed an emergency escape system over the <br />Hubbard Creek Shaft. The hoist is 20 -feet long, 8 -feet wide and 9 -feet <br />tall. The hoist foundation consists of six 5.5' X 5.5' 16" thick spread <br />footings with 4 -foot tall 18 -inch diameter piers. The head frame has a 20- <br />foot square base, is 3 -feet by 12 -feet at the top and is 27 -feet tall. The <br />head frame will be bolted to the existing shaft collar. The emergency <br />escape system has been removed. <br />Filter Building <br />A pre - engineered metal building designed to house a filter system to clear <br />the water obtained from the Deer Trail Ditch. The filter building is adjacent to <br />the pump house which is located along the Deer Trail Ditch. The building is <br />approximately 40 feet by 16 feet with an 8 -foot eave height. <br />MR -130 2.05-21- 06/18/12 <br />