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Roger Day: <br />Was a tracer study also done with the same type of results? <br />Jerry Daub: <br />It's not only that study —the test that Roger just explained was done down here, and I believe <br />it was the 26 -88 -1 well. North of that about' of a mile in 1980, the data and testing that was <br />done and the USGS participated in they were on site and confirmed similar tracer /spinner <br />tests. And that's there in the central part of the basin. It's an active process of subsurface <br />dissolution of these minerals that's ongoing now. Granted, 70,000 is at the high end, but the <br />low end is probably in the order of 12,000 to 15,000. But all of that is from published data. <br />Jim Komatinsky: <br />Have you considered these pressure differentials in the monitoring program, as far as the <br />wide spread of these pressure differentials between these aquifers? <br />Roger Day: <br />That's why we were talking about individual monitoring wells (not multiple completion <br />single wells). Continuously recording piezometers reading the water pressure. We will give <br />a lot of thought to the dissolution and have that piezometer working all the time. <br />Ned Banta: <br />I think you're right about monitoring the water pressure. I agree with that as a first indication <br />of a potential problem. I was thinking also that monitoring specific conductance might be <br />worthwhile mostly in the A and B.Grooves in addition to monitoring the water levels. This <br />doesn't require taking a sample, you monitor with an instrument down the hole. I'm not <br />talking about a sample, I'm talking about just monitoring the conductance. <br />Roger Day: <br />Have you got experience with long -term use of putting an instrument like that in and getting <br />good data from it? <br />Ned Banta: <br />No. <br />Roger Day: <br />If the instrument exists and we can spend a few dollars and get it in there and have it be <br />reliable, we like it. If it's something that's drifting just on it's own nature and you're <br />pulling... <br />Ned Banta: <br />Well, you have drift problems with pressure transducers, too. It's certainly easier to calibrate <br />the pressure transducer. <br />Roger Day: <br />Paul Daggett and I both have really done a lot of work with those transducers there in White <br />River and the drift. There was some drift on a daily basis. The sun would shine on the <br />instrument box on the surface. There was that feature. The instrument manufacturer came <br />out and changed his resistors, or whatever, and he was able to straighten that right out. We <br />17 <br />