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well, and following mining. Wells within an active panel will be <br />logged oncc; every five years following mining to monitor formation <br />movement and re-define total depth. By repeating the gamma ray <br />logs, moverent of the formation due to subsidence can be detected. <br />Subsequent subsidence wells will be constructed when 625,000 tons <br />of nahcolite have been mined and monitoring wells will not exceed <br />a distance of 1000 feet apart. Wells 88-1, 91-1V, 93-3V, 4A-4V, <br />will used for subsidence wells. <br />- At least one multi-point bore hole extensometer will be install in <br />panel # 1 to measure subsidence. Completion of the extensometer <br />will be in the Mahogany Zone and below the B-Groove and over an <br />injection point of cavity #4. Continuous measurement of formation <br />movement will provide data on possible subsidence. <br />2.0 Surface Subsidence <br />WRN has a grid of surface monuments which span the mining area (well field <br />or panel). Some of the ronuments are located outside the zone of influence <br />from subsidence, while others have been placed directly over the well field. <br />Annual surveys are conducted to measure surface subsidence. <br />32 <br />