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6.4.4 Exhibit D <br />Mining Plan <br />The Sharp Gravel Pit will target gravel 10 -15 feet deep beneath <br />approximately 10 feet of overburden. In order to fulfill responsibilities under <br />Colorado Department of Transportation Special Provision Federal Aid Project No. NH <br />0505 -046 US 50 Hasty and McClave, gravel extraction will be necessary for two <br />years, the life of the project, and will commence no later than July 17, 2012. <br />Reclamation will occur concurrent to mining. The primary commodity is gravel with <br />secondary commodity of dirt. Incidental materials not used in the road improvement <br />project will reconstruct the pit floor and lessen pit slopes. <br />Mining will proceed in approximately 80 -acre phases beginning in the west <br />half of the subject property. Beginning in the south portion of the west 1/2 of the site, <br />mining will proceed north to the 10 acre process area located in the northwest <br />corner. The top ten (10) inches or depth to gravel, whichever is less, of soil suitable <br />as plant growth medium will be salvaged and stockpiled for use during reclamation. <br />Plant medium will be stockpiled in perimeter stockpiles and posted as reclamation <br />topsoil. Waste rock or overburden will be stockpiled and used to rebuild the pit floor <br />or pit slopes during reclamation. Fines or overburden perimeter stormwater diversion <br />berms will be constructed as excavation and reclamation progresses. Initial project <br />stockpiles will be placed along the south property boundary. As mining progresses <br />northward, reclamation will begin in the previously mined out areas consuming the <br />initial stockpiles. Subsequent stockpiles will be either used immediately in <br />reclamation or established on the floor of the gravel pit. <br />Mining will develop a gravel pit to a depth of approximately 25 -30 feet. Bent <br />County requested a 50 foot setback from the 60 foot ROW for County Road JJ. <br />Power line, abutting neighbor and Sharp structures setback will be 25 feet. No <br />groundwater is expected at this excavation elevation; therefore no impact to the <br />hydrologic balance is anticipated. No acid or toxic producing materials will be <br />exposed during mining. No explosives will be used in conjunction with mining or <br />reclamation. <br />The proposed mining operation will consist of an access road south from <br />County Road JJ. Aggregate will be processed and sized using a crusher and screens. <br />A portable asphalt plant will operate on site in the processing area. Processing will <br />occur in the northwest corner of the site for the duration of the project. The control <br />van will serve as operation center for employees. All interior haul roads will be <br />temporary, reclaimed as mining progresses. <br />M <br />