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6.4.4 Exhibit D <br />Mining Plan <br />The Leone Gardner Pit is an existing site that Hard Rock Paving and Redi Mix is seeking <br />to expand from its current 9.95 acres to 54.43 acres. The target gravel source is located <br />beneath limited top soil and overburden. The primary commodities are sand and gravel. <br />Incidental materials not used for construction material will be used to reconstruct the pit floor <br />and lessen the pit slopes. A portable asphalt or concrete batch plant may be onsite as projects <br />warrant. <br />Mining will proceed from the northwest corner of the expansion of the pit and will move <br />easterly and then southerly in 20-acre increments. Extracted material will be moved to the <br />processing area that is anticipated to be located on the initial 9.95-acre portion of the pit. <br />Earthmoving will be accomplished using bulldozers, front end loaders and/or scrapers <br />depending on the depth of plant growth material and overburden. All plant growth material <br />and topsoil will be salvaged and stockpiled for reclamation use. Front end loaders will be used <br />for mining at the site. These stockpiles will be located at the perimeter of the site and posted <br />as reclamation topsoil. Waste rock and overburden will be stockpiled and use3d to rebuild the <br />pit floor and slopes during reclamation. Overburden perimeter stormwater diversion berms <br />will be constructed as excavation and reclamation progresses. <br />Mining will develop a gravel pit to a depth of approximately 20 feet. The structure on <br />the property located at the far northeast portion of the permit area will have a 50-foot setback <br />utilized. The private road will be reestablished across the bottom of the reclaimed pit. No <br />groundwater is expected to be encountered during excavation and mining; therefore, no <br />impact to the 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 reclamation. <br />The proposed mining operation will consist of an access road from the northwest of the <br />site. Aggregate will be processed and sized using a crusher and screens. All interior haul roads <br />will be temporary and will be reclaimed after the mining has been completed. It is estimated <br />that the life of the pit is 20-25 years and is dependent upon demand. <br />Comments were solicited from the Colorado State Historic Preservation Office (SHPO). <br />This is attached for your review.