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r- <br />floor of the Bear and Edwards Mines for more than 2 miles without undergoing <br />substantial cooling. This is very unlikely because: 1) temperature measurements of water <br />in the WEM clearly demonstrate that thermal groundwater, even when buffered against <br />temperature loss by large volumes, quickly cools 10 to 20 °F in the mine environment, <br />and 2) there is no evidence for heating in the Beaz or Edwards Mines. The first fault <br />water stored in the NW Panels sealed sump, BEM fault water, had a discharge <br />temperature only 3 °F greater than the discharge temperature of Edwards Mine portal <br />spring water. This BEM fault water most certainly underwent some cooling prior to <br />storage in the NW Panels sealed sump and may have undergone some cooling during in <br />the NW Panels sealed sump. <br />The temperature of water discharging from the Edwards Mine portal spring requires a <br />heating source. In the WEM we found that fault-related thermal groundwater discharges <br />originate in the uppermost sandstone horizon of the Rollins Sandstone. It is plausible that <br />a similar fault mechanism in either the Bear or Edwards Mines is the source of thermal <br />discharge from the Edwards Mine portal spring. Such a fault source could easily have <br />been overlooked during mining operations because the volume of water discharging from <br />the Edwards Portal spring is small. <br />Respectively submitted, <br />1~.~-~~ <br />Alan L Mayo, Ph.D., RG, PH <br />ce: Kuk Mueller <br />Kathy Welt <br />(Edwep~98.d°c YlON8) <br />3 <br />