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Mr. Al Amundson <br />Mr. Anthony J. Waldron <br />Environmental Protection Specialist <br />State of Colorado <br />Department of Natural Resources <br />Division of Minerals and Geology <br />July 8, 2002 <br />Page 2 <br />A. 6.4.3 EXHIBIT C <br />{80600:1 } <br />1. (Page 2) - New maps are attached not smaller than 1" = 600' and not larger than <br />1" = 50', in accordance with Rule 6.2.1(2). <br />2. (Page 2) - There was an error in the ownership shown on Exhibit C -1. The portion <br />of the SE 1 /4 of the NW 1/4 east of the railroad is owned by GCC (part of parcel <br />2500000049). The small piece immediately south is owned by Scanio, et al, and is <br />part of parcel 2500000019. Revised Exhibit C -1 is attached. <br />3. (Page 2) - Attached new Exhibits C -4, C -5, and C -6 illustrate the thickness of the <br />Fort Hayes limestone, overburden (unconsolidated material), and shale, <br />respectively. Attached new Exhibit C -7 is a stratigraphic column from the surface <br />to the Dakota Sandstone, the first confined aquifer. <br />4. (Page 2) - The general strike of the Fort Hays limestone is N49 °W at a dip of <br />approximately 2° NE in the vicinity of the project. Revised page D1. <br />5. (Page 3) - From the stratigraphic column, it is clear that the Dakota Sandstone is <br />approximately 450 ft below the mining elevation and that several thick, relatively <br />impervious, shale layers separate the operations from the aquifer. Because of the <br />depth to the aquifer and the impervious nature of the shale layers, meteoric waters <br />will not enter the unconfined aquifer, as discussed in revised Exhibit G. <br />6. (Page 3) — The permit area is sparsely vegetated and has minimal vegetation <br />communities. Attached Exhibit C -2 illustrates vegetation distribution within the <br />permit area. <br />7. (Page 3) — Attached revised Exhibit C -2 illustrates significant, valuable, and <br />permanent man-made structures within the affected land and within 200 ft of the <br />affected land. Stock ponds, water lines, stock tanks, and stock fences are shown, <br />as well as telephone lines, roads, railroads, buried fiber -optic cables, and power <br />lines. <br />8. (Page 3) - The stock pond located in what was previously depicted as the 20 year <br />mining block will not be disturbed as a result of the change in the mining plan <br />which now excludes that structure. No dewatering of the stock pond will occur <br />because natural arroyo conditions will remain intact during the mining operations. <br />Revise Exhibit C -2. <br />