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floor of the Bear and Edwards Mines for more than 2 miles without undergoing <br />substantial cooling. This is very unlikely because: 1) temperature measuremenu of water <br />is the WEM clearly demonstrate that thermal groundwater, even when buffered against <br />temprnture loss by large wlumes, quickly cools 10 to 20 °F in the mine environment, <br />and 2) there is no evidence for heating in the gear or Edwazds Mines. The first fault <br />` water stored is the NW Panels sealed sump, BEM fault water, had a discharge <br />temperature Drily 3 °F greater than the discharge temperature of Edwards Mine portal <br />spring water. This BEM fault water most ceRaialy underwent some cooling prior to <br />storage in the NW Panels sealed sump and may have undergone some cooling during is <br />the Nw Panels sealed comp. <br />The temperature of water discharging from the Edwards Mme poral spring requires a <br />heating source. In the WEM we found that fault-related thermal groundwater dixhazgcs <br />originate in the uppermost sandstone horizon of the Rollins Sandstone. It is plausible that <br />a similar fault mechanism in tither the Bear or Edwards Mines is the source of thermal <br />discharge from the Edwards Mme poRal spring. Such a fault source could easily have <br />been overlooked during mining operations because the volume of water d'ucharging from <br />the Edwards Portal spring is small. <br />Respectively submitted, <br />~//~/ <br />~ Alan L Mayo, PhD., RG, PH <br />a: ICidt Mudkr <br />xatny was <br />(6dw.pQ9adaYtel9~ <br />i <br />