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ASLLP Appendix C Well Fluid Displacement Cavity Fluid Displacement Procedure Upon completion of the seismic modeling phase, the fluid displacement phase was initiated. The procedures for displacing the fluid from AS 28-21 were as follows: Nitrogen gas was directed through flow and pressure instrumentation and was initiated down the short 7" casing on the well. Concurrent with the gas injection, fluid from the cavity was directed from the long 4'h" tubing of the well, through flow and pressure measurement and combined with the wellfield production fluid and transported by pump to the plant stripping facility. 2, An initial temperature log was performed 4/30/04. A gas cap anomaly was very difficult to interpret. To verify the position of the gas cap, ASLLP perforated the short string tubing at 1680' and pushed the gas cap down until the gas cap pressure was expressed through the pressure on the short string tubing. This insured that the gas cap position was 1680'. 3. On 5/10/04, eighty barrels of return mine water at a temperature of 130 -140 degrees Fahrenheit was pumped through the long 4'/z" tubing into the cavity. A series of temperature logs were performed on approximately 2 hour intervals. White the individual temperature logs did not express the position of the gas cap, the change between the temperature logs gave a very good anomaly at the gas cap /solution interface. 4, To prevent operational problems associated with pumping cool fluid into the cavity, the procedure to locate the gas cap was revised to locate the gas cap every 7 - 10 days. The nitrogen gas injection rate and nahcolite brine production rate were slowed to enhance resolution. 5. An average production fluid flow rate of approximately 10 gallons per minute from the cavity was maintained while injecting approximately 60 scfm of nitrogen gas. 6. These rates were maintained from 5/10/04 until 5/21 /04.