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<br />Overlying and underlying confining beds sufficiently thick and <br /> <br /> <br />impermeable to confine waste to the injection interval. <br /> <br /> <br />A relatively simple geological structure. <br /> <br />Water in the disposal formation of poor quality, i.e., not <br /> <br />potable <br /> <br />and <br /> <br />not <br /> <br />suitable for municipal, agricultural or <br /> <br />industrial use. <br /> <br />Williams Brothers' initial feasibility study confirmed that the <br /> <br />Mississippian and the Devonian formations present under the Paradox Valley <br /> <br />have the desired characteristics for satisfactory long-term disposal of <br /> <br />the brine. Formations above the Mississippian and Devonian, notably the <br /> <br />Hermosa Paradox Member, a massive salt formation interbedded with other <br /> <br />facies, would provide a positive barrier to the upward movement of brine. <br /> <br />The underlying impermeable igneous basement rock provides an excellent <br /> <br />lower barrier (see figure 5). With a properly engineered installation and <br /> <br />appropriate operation, the injected brine would remain in the designated <br /> <br />disposal formations witn no break through to the surface or to fresh water <br /> <br />zones. The proposed brine disposal system could be operated indefinitely <br /> <br />with no significant impact on the environment or on seismic activity in <br /> <br />the area. The number of disposal wells required to inject the anticipated <br /> <br />brine rate of YOO gpm cannot be established until the first well is <br /> <br />completed and tested. <br /> <br />However, the information available indicates that <br /> <br />one well may have sufficient capacity for the entire 900 gpm rate. <br /> <br />Successful long-term deep well disposal will require filtering the <br /> <br />brine, which contains <br /> <br />approximately <br /> <br />1.0 ppm suspended solids. <br /> <br />A <br /> <br />diatomaceous earth filtering system was chosen as the most desirable <br /> <br />type. <br />well. <br /> <br />All dissolved gases would be left in the brine for disposal in the <br /> <br />000574 <br /> <br />9 <br />