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,P <br />• 4.3,2 Production Wells <br />Although only 33,137 tons were produced from cavity #2 with permitted yield of 63,000 <br />tons, mining was postponded due to high NaCI. The injection well (91-2H) for cavity #2 <br />was recompleted to operate as an injection and recovery well to avoid the zone with high <br />NaCI concentration. Lov/ saturation rates limited production from cavity #2 after the <br />recompletion. <br />A record of mud utilized, per BLM and EPA permit requirements, to maintain a mud pack <br />in the annulus of the production wells, is shown on Table 4-2. Existing wells for cavity <br />#2 required 25 bbls (92-2H) in early 1994, but minimal quatities, the remainder of 1994. <br />New wells for cavity #3 (93-3V and 4H) required substantial quantities of mud through <br />• most of 1994 <br />In 1994, WRNM began investigating cavity mapping possibilities with USDI Bureau of <br />Mines. Also North American Chemical employees began modeling work to better define <br />solution mining. In the future, mapping and modeling efforts will continue. <br />4.3.3 Monitoring Wells <br />The only new monitoring well in 1994 was the sonar/subsidence well (94-1 M) over cavity <br />#3. <br />• 27 <br />