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• Though work was started on repairing IRI-1 during 1991, attempts to remove <br />blockage which prevents water level monitoring were terminated until the summer <br />of 1992. Presently there appears to be remnants of a downhole water level probe <br />which is preventing the washing out of the sand/bentonite blockage. Work to <br />repair the well ceased when the plant was shut down. Work will be rescheduled <br />when weather permits. Updated downhole diagrams for IRI-1 and IRI-4 are <br />included as Figures 47 and 4-8. <br />There have been numerous problems in the past when attempts were made to <br />recover the downhole fluid level indicators from several of the monitoring wells <br />used by NaTec. These problems normally occurred when the electric line <br />connected to the level indicator snared the 1/4" sampler lines. To eliminate this <br />problem, 1 1/4" PVC pipe was run in several wells to isolate the indicators from <br />• the fluid sampler tubing. Approximately 550' of PVC pipe was run into EX-2, IRI- <br />4 and IRI-5. Other monitoring wells in the NaTec lease will have the PVC pipe <br />installed during 1992 to isolate their pressure transducer from the sampler lines. <br />4.3.4 Geotechnical Program <br />Results of the sonar survey of the cavity in 88-1 (from the recovery well), indicate <br />a premature developed mined zone; as expected. The profile of the mined section <br />in the recovery well exhibited greater dissolution in the low insoluble sections of <br />nahcolite and less in the shalier areas. The profile created by the dissolution <br />process developed hour glass curves through the Boies Bed mineable zone. When <br />the 7" liner was raised, soft insolubles probably filled in the area above the open <br />halite zone. Due to the early stage of cavity development, results of the sonar <br />. survey were interesting, but of questionable value in confirming or contradicting <br />29 <br />