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E3~HIBIT D - MINING FLAN (REVISED) (continued) Sand and gravel strata, which underlies the overburden, comprises the marketable product of this mine. This material will be exca- vated and processed, on the basis of market demand, by three general methods: a. A portion will be excavated, loaded directly into trucks, hauled from the project site in pit run gradation, and marketed as pit run base material. b. A portion will be crushed and screened to provide graded and sized sand and gravel products. Stockpiles of such graded materials will be established and maintained in sufficient quantity to meet market demands for these graded products. These stockpiles will be located as shown on Exhibit C, Mining Plan Map (Revisedl, Layout of Facilities, which also shows future location of the crushing an~i screening operation. c. Output from the crushing and screening operation will also providE~ aggregates for on-site operation of a con- crete batch plant, which will support a mobile concrete pre-mix truck fleet operation. Location of this exist- ing batch plant is as shown on Exhibit C, Mining Plan Map (Revised), Layout of Facilities. Ground water is encountered at about four (4) feet below ground surface throughout tt-~e project area. To lower this water table sufficiently to permit sand and gravel extraction and processing, a stilling basin and 800 g.p.m. electric pumping station has been established at the Southeast Corner of the project area. Ground water is disposed of by pumping it into the adjacent Arthur Ditch in accordance with contractual arrangements with the Arthur Ditch Company. Colorado Department of Health, Water Quality Control Division, has issued NPDES Permit Number COG-500085, Larimer County, covering this operation; expiration date of this existing permit is midnight 30 September 1987. This de-watering point will be the only such point established, and will serve the project throughout the life of the mine; it will be the last part of the project area to be reclaimed. No excavation or mining will be done on the 5.471 acre service and support area of the permit. Upon completion of mining operations and reclamation in the=_ 9.956 acre area of the adjoining mine, this service and support area will be cleared of all equipment, materials and facilities, and returned to agricultural use as it was before involvement with mini~zg of sand and gravel under auspices of this permit. All aspects of the operation including access and service roads, processing areas, off:_ces, scales, stockpile areas and all other mine related activitiEas are contained within the boundary of the 15.427 acre permit arE~a. (See Exhibit C, Mining Plan Map (Revised), Layout of Facilities). The only access to this site is via North Taft Hi11 Road at the Southwest Corner of the permitted area.