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Mr. Hal Simpson • • <br /> May 19, 1995 <br /> Page 2 <br /> Areas 1 and 28 will not be enclosed in the slurry wall due to underground utilities <br /> (Area 1) and the Bull Seep (Area 2B). Mining will begin on Area 1 in June, 1995. <br /> This area will be wet mined with a drag line. Concurrently, the construction of the <br /> slurry wall will begin. The mining of Area 1 will be completed in approximately five <br /> months. At that time the slurry wall will be complete and the mining within the slurry <br /> wall will commence. Mining inside the slurry will begin in south and proceed <br /> northward. Upon completion of the mining of Area 1 the dragline equipment will be <br /> moved to Area 2B. Mining of Area 28 and the area inside the slurry wall will be <br /> occurring concurrently. Mining of both areas will be completed within approximately <br /> six years. During the life of the operation the Area 1 may be backfilled by sand spoils. <br /> Area 28 is proposed as an open lake. <br /> The interior of the slurry wall will be dewatered by a sump located in the southwest <br /> comer of Area 2A. The water will be discharged, via a pipeline directly to the South <br /> Platte at the permitted NPDES discharge point shown of Ex. C-2. <br /> At the completion of mining slurry walled area will be utilized as a reservoir. <br /> Permanent lakes will remain in Areas 1 and 2B. <br /> DEPLETIONS <br /> Cooley plans to mine 1.6 - 1.7 million tons per year. The water surface area exposed <br /> to the atmosphere will consist of a small area of residual water in the sump and Area <br /> 1 and 2B. Due to some backfilling during mining, the maximum area to be exposed at <br /> any one time is estimated to be no more than 20 acres in Areas 1 and 2B and two <br /> acres inside the slung wall. No water will be used from the pit for dust suppression. <br /> During the first two years of mining the maximum exposed area is estimated at 12 <br /> acres. <br /> The depletions from mining of the Dahlia North Resources Pit will result from <br /> evaporation and water lost in the product. The gross evaporation of 40.5 inches per <br /> year was determined from the NOAA Technical Report NWS 33. The monthly <br /> distribution is based on the SEO draft criteria dated February, 1995. <br /> Presently, a portion of the property is being irrigated by GASP wells and the <br /> remainder is non-irrigated pasture grass. Enclosed is Exhibit C-18, Pre-Mining Plan <br /> Map, which shows the areas irrigated and non-irrigated land. Since, the GASP rights <br /> Page 8, EXHIBIT G-1 <br />