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III IIIIIIIIIIIII III <br />Mayo and Associates <br />Consultants in Hvdr~ <br />710 East 100 North • Lindoq Utah 84042 • (801) 79E~0211 • (801) 785-2387 (Fax) <br /> <br />February 20, 1998 <br />Ms. Susan McCaaaoa <br />Mr. David Berry <br />Division of Mmerals and Geology <br />Office of Mined Land Reclamation <br />1313 Sherman Street, Rat 215 <br />Denver, CO 80202 <br />12E: Supplement to `Comparison of West Elk Mme fault-discharge water with <br />discharge water from the Edwards Mule portal, Somerset Colorado'. <br />The propose of this memorandum is to compare the discharge temperature data of the <br />West EIk Mme (WEIVl) fault-discharge water with discharge water from the Edwards <br />Mine portal spring. <br />Grormdwaters issuing from WEM BEM and 14 SEHG iaulu sad water issuing from the <br />Edwards Mine portal spring have elevated temperatures relative to mean aamral air <br />temperature and may be considered thermal. Based on a recemly wmpleted study, the <br />source of elevated temperatures of WEM's fault waters u the elevated geothermal <br />gradient of the region. <br />The critical issue here is whether the elevated temperature of fault discharge water is <br />evidence of hydraulic communication between aster stored in the NW Panels sealed <br />sump and thermal water discharging from the Edward Mme portal spring. <br />PiW Paadt Sealed Sump <br />The NW Panels sealed sump has received appreciable quantities of water from both the <br />BFM and 14 SEHG faults, az well as a minor amount of cooler temperature operations <br />water and wlluvial inflows. Maximum recorded discharge temperatures ofBEM and la <br />SEHG fault waters were 89°F and 84°F, respectively. However, most measured <br />