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<br /> <br /> <br /> <br />r <br /> <br /> <br /> <br /> <br />r <br /> <br />1 <br />1 <br /> <br />IJ <br />1 <br />1 <br />EXHIBIT D <br />MINING PLAN <br />A. Flethods of Paining <br />Prior to extraction of the sand and gravel in each of the four stages <br />of mining, topsoil and overburden (averaging three-foot depth) will be re- <br />moved by scrapers. This material will be used to construct screening mounds <br />along the perimeter of the property, to construct a suitable dike along the <br />south edge of St. Vrain Creek, and to construct access and circulation road- <br />f <br />ways. The screening mounds will also serve as topsoil and overburden stock- <br />piles for later distribution during reclamation activities. In addition, <br />it has been estimated by County personnel that as much as one-third of the <br />crushed sand and gravel will be "fines" and will remain at the site. This <br />material will be stockpiled and/or distributed appropriately for reclamation <br />purposes. <br />The County will use a dragline to remove the sand and gravel to an <br />average depth of 15 feet below the present land surface (three feet of over- <br />burden and 12 feet of material). Because of the close proximity to St. Vrain <br />Creek and because of the existence of the alluvial aquifer, much of the sand <br />and gravel will be saturated with water. Therefore, the operators will stock- <br />pile the excavated material and allow it to drain prior to crushing and/or <br />transport from the area. As this material is removed, excavation by the <br />dragline will resume. <br /> <br />