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MINING PLAN EXHIBIT D <br />1. Operation before 2007 <br />Mining began on the southern end of the flat terrace in 1980 after permit approval and proceeded <br />northward. Topsoil was stockpiled in a perimeter berm that extends around the west and north <br />sides of the mining area. This stockpile is 16-20 feet wide at the top, approximately averages 8 <br />feet high with 3H:1 V sideslopes. As of the start of 2007, this stockpile contains approximately <br />65,800 cubic yards. The stockpile has been well-vegetated over the years and is free from <br />significant erosion. The gravel terrace is approximately 40 feet to 80 feet in depth and, in many <br />places along the pit bottom; it has been mined to within 2 feet of the shale bedrock below. This <br />bedrock is Cretaceous Age Mancos Shale. Mining has taken place with bulldozers, loaders and <br />trucks; no blasting has been used. The mining slope at the pit perimeter has been approximately <br />1 H:1 V but most areas have now been backfilled to the designated reclamation slope of 3H:1 V. <br />The remaining area for backfill is along the eastern edge of the current pit, as shown on Map C- <br />2. <br />As of the start of 2007, most of the existing flat terrace has been mined out and imported fill has <br />been placed in the northern sections of the pit area. Prior to the year 2000, very little imported <br />material was brought to the site. Since that time, the amount of imported fill has steadily <br />increased and has now almost filled the northern section of the pit almost to the approximate <br />original contour. <br />No groundwater has been uncovered in the pit but rainfall runoff and some excess irrigation <br />water can be found in minor locations within the pit. The mine office, crusher/screen plant, wash <br />plant, concrete plant, asphalt plant, ponds, fuel storage facilities and employee housing area will <br />not change for the 2007 Amendment. These facilities are described in the following sections. No <br />new facilities will be added except for a new canvas storage building described under Section 5. <br />All existing facilities will stay in the pre-2007 mine area for the mining of the expansion area. As <br />of the start of 2007, the disturbed area of the operation is 54.6 acres. <br />Vagneur Pit June 07 D-1