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2.05.3 <br />route the pond discharge water around gob pile no. 3. The permanent plan <br />will not be implemented for many years. <br />Conveyor Underpasses <br />Three conveyor underpasses were constructed for the downhill conveyor <br />project. One is located on the portal bench. The second is located <br />immediately below the downhill conveyor transfer building. The third is <br />located about midway along the downhill conveyor and will serve as a wildlife <br />overpass. A fourth conveyor underpass was constructed to provide haul <br />road access over the downhill conveyor to the B -Seam portal bench. The <br />underpasses are 9 -foot diameter multi -plate and are approximately 100 -feet <br />long. The B -Seam conveyor multi -plate underpass is approximately 60 -feet <br />long supported on concrete footers as shown on Map 38. A 3,400 face <br />square foot retaining supports the road up to and over the multi - plate. The <br />retaining wall is reinforced with Tensar geogrid and faced with decorative <br />concrete block. <br />Water Treatment Building <br />A small (10'X10') water treatment building located northwest of Pond C used <br />to add CDPS approved chemicals to the water as necessary for clarification. <br />0 Bent Protectors <br />Two concrete bent protectors located at the coal stockpile level. One is three <br />sided with 20 feet high walls, 42 feet long and 16feet wide. The other is a <br />four sided structure with 28 foot average height walls, 48.5 feet long and 15.5 <br />feet wide. The four sided structure has a metal roof. <br />Rock Bins <br />Concrete bins located at the B- Bench. The concrete base is 20 feet by 30 <br />feet. The 8 foot high walls are 40 -feet long <br />Retaining Wall <br />Concrete retaining wall located at the B- Bench. The 8 -foot high retaining wall <br />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 was <br />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 />• PR -12 2.05-20- 02/10 <br />/t OPRov� fl <br />I► /l6�la <br />