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due to the anticipated stability of the pillars during production and enhanced stability after <br /> icooling. Given the stability demonstrated in the single cavern and multiple cavern analyses, <br /> negligible, if any, deformation is anticipated at the Dissolution Surface, Mahogany Zone, or <br /> on the ground surface. Based on these results, no impacts are to be expected on the <br /> overlying aquifer systems. <br /> The above appears conservative since based on mathematical calculations PB-KBB, Inc. <br /> (January, 1999) believes that cavities with 300 foot spacing between the centers of the <br /> cavities will have stability and subsidence characteristics similar to the 350 foot centers <br /> evaluated by Hardy and Goodrich. <br /> 4.6. NAHCOLITE SURFACE PROCESSING FACILITIES <br /> The proposed nahcolite processing and sodium biocarbonate production process for the <br /> experimental 50,000 tpy pilot plant will consist of the following systems: <br /> A. Plant Feed Conditioning <br /> B. Sodium Bicarbonate Crystallization and Dewatering <br /> C. Sodium Bicarbonate Drying and Storage <br /> D. Leach Fluid Conditioning and Downhole Injection <br /> E. Liquid Waste Evaporation and Disposal <br /> F. Utilities <br /> These surface facilities are described below and shown on Figure 4-9 Simplified Process <br /> Flow Diagram. <br /> A. Plant Feed Conditioning <br /> This part of the process will prepare the raw plant feed liquor coming from the <br /> production wells for the crystallization of sodium bicarbonate. <br /> Pregnant soda liquor produced from In-situ leaching of the nahcolite is expected to <br /> contain up to 25 percent dissolved sodium bicarbonate at an operating temperature <br /> of 275 to 300°F. The nominal design flow rate for the solution mining process to <br /> meet the planned capacity of 50,000 tons per year is up to 400 gpm. The solution <br /> mining process will be continuous. <br /> G:ILMIM78545.0021MinaPlan%MINEPLAN.DOC 4-18 <br />