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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. 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 />Beginning south of the Lamar Light and Power 100 foot setback under the <br />transmission line, mining will proceed in approximately 70 -acre phases beginning in <br />the west half of the subject property. Mining will begin in the south portion of the <br />west 'h of the site, extracting material northward to the 10 acre process area located <br />in the northwest corner. Earthmoving will be performed using bulldozers and /or <br />scrapers depending on depth of plant growth material and overburden. Mining will <br />be performed with loaders. Bulldozers may be utilized during mining to maintain <br />slopes and manage stockpiles when necessary. The top ten (10) inches or depth to <br />gravel, whichever is less, of soil suitable as plant growth medium will be salvaged <br />and stockpiled for use during reclamation. Plant medium will be stockpiled in <br />perimeter stockpiles and posted as reclamation topsoil. Waste rock or overburden <br />will be stockpiled and used to rebuild the pit floor or pit slopes during reclamation. <br />Fines or overburden perimeter stormwater diversion berms will be constructed as <br />excavation and reclamation progresses. Initial project stockpiles will be placed along <br />the south property boundary. As mining progresses northward, reclamation will <br />begin in the previously mined out areas consuming the initial stockpiles. Subsequent <br />stockpiles will be either used immediately in reclamation or established on the floor <br />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. The <br />transmission line owned by Lamar Light and Power traverses the north portion of the <br />property. Transmission line poles will have a 75 foot radial setback and 50 foot <br />easement where no mining will occur. No groundwater is expected at this <br />excavation elevation; therefore no impact to the hydrologic balance is anticipated. <br />No acid or toxic producing materials will be exposed during mining. No explosives will <br />be used in conjunction with mining or 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 />Comments received August 17, 2012 from Colorado State Historic <br />Preservation Office (SHPO) indicate the southern portion of the subject property is <br />located adjacent to a formally recognized segment of the Santa Fe Trail. As <br />indicated in the mine plan map, the southern portion of the property is not included <br />in the proposed affected area and this portion of the trail will be avoided. However, <br />due to the meandering nature of historic trails there is a potential for associated <br />features or artifacts to be present within the proposed affected area. In the event <br />Revised October 22, 2012 4 <br />