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• 4.3.2 Production Wells <br />Injection and recovery from wells 1A-4H1 and 1A-5HR, for cavity #1A was started in <br />March of 1998. This new cavity responded well to initial mining, and plant production <br />correspondingly increased. No chloride contamination has been detected in either <br />cavity #1A or cavity #3A. Slight chloride influx has been detected in cavity #4. This <br />influx is easily controlled with the dilution created during plant operation. <br />A record of mud utilized, per BLM and EPA permit requirements, to maintain a mud <br />pack in the annulus of the production wells, is shown on Table 4-2. In 1998, injection <br />well 1A-4H1 was cemented using a DV tool to help in bringing cement to the surface. <br />• All active production wells were cemented to surface in 1998 and in the future will <br />require minimal cement to maintain mud to surface. <br />4.3.3 Monitoring Wells <br />No new monitoring wells were drilled or completed in 1998. Production well 90-5 is <br />equipped with a pressure transducer with a real time read-out in the control room. <br />Pressure transducers and access wire was replaced in numerous wells as needed during <br />1998. Seventeen wells are utilized and provide continuous water level data. Water quality <br />data is collected from sixteen wells. <br />• <br />21 <br />