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EXHIBIT D - MINING PLAN NARRATIVE (CONTINUED) <br /> The approximate location of where the slurry wall was installed is shown on MINING PLAN MAP, <br /> EXHIBIT C-2. The slurry wall installation consisted of excavation of a trench approximately 4' wide <br /> through the gravel product strata to a minimum depth of 3' into bedrock. Visual inspection during <br /> trenching along with depth measurements were conducted to assure that the trench met the minimum <br /> penetration requirements of 3'. Slurry/mixing holding ponds were constructed at regular intervals <br /> adjacent to the trench excavation. A consistent slurry was produced by mixing bulk bentonite and <br /> any suitable on-site clay material with local ground water in conical static mixer. The slurry product <br /> was discharged into a holding pond, and then pumped through hoses and aluminum irrigation piping <br /> to the trench section under construction. Independent engineering services were required with a daily <br /> log of construction progress during installation, including continuous on-site observation, surveying, <br /> sampling, field testing of various slurry trench parameters, and assimilation of as-built information. <br /> The product material will be excavated using backhoes, scrapers, bulldozers, and other similar <br /> equipment. It is anticipated that most of the product material will be transported by conveyor belt <br /> to the existing plant north of the South Platte River, which traverses Areas 1, 2A & 2B. Cooley has <br /> retained the right to process the material on-site and transport it off-site by truck, if necessary. <br /> Processing equipment would consist of a crusher, screens, washer, and conveyors. There may also <br /> be temporary ponds, for settling and recycling, and a scale house and small office might be set up at <br /> either of the two truck access points. <br /> In the event some of the material is transported directly from the site by truck, the primary haul route <br /> for transport of material from the site will be 88th Avenue and Monaco Street to I-76 for use in other <br /> parts of the metropolitan area. Other routes may also be used for local deliveries and destinations <br /> northwest and north. <br /> The operation will normally operate from 6:00 A.M. until 10:00 P.M. six days a week, although <br /> extended hours and work on Sundays and Holidays may occur during extremely busy periods. <br /> Hauling would be allowed between the hours of 6:00 A.M. to 6:00 P.M. Monday through Friday and <br /> 8:00 A.M. to 5:00 P.M. on Saturday, unless longer hours are granted by Commerce City, which is <br /> the local government with jurisdiction. <br /> To summarize, the Mining Areas are as follows: <br /> Existing Permit Area Proposed Permit Area under Amendment 91 <br /> Area 1- 5 Acres 5 Acres <br /> Area 2A- 50 Acres 50 Acres <br /> Area 213- 91 Acres 101 Acres <br /> Area 2C- 34 Acres 34 Acres <br /> Total 180f Acres 190+ Acres <br /> Page 3, EXHBIT D <br />