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_ 1 <br /> drainage water from the Horseshoe No, 1 Mine portal , and the pool in the mouth <br /> of adit 1 at the Brushy Basin Mine. <br /> The remaining five water sampTts were taken to gauge the effect of mine <br /> drainage on water quality in several streams. Two samples sere taken in <br /> La Sal Creek, one sample approximately 1 mile upstream of the Firefly Mine and <br /> a second sample below the confluence of La Sal Greek and Two Mile Creek <br /> (approximately 1 mile below the Firefly and Grey Daun Mines) . A water sample <br /> was taken from Two Mile Creek Immediately upstream of the Grey Daun Mine. <br /> _ Additionally, a sample was taken from the Glade Pit. a reclaimed open-pit mine <br /> filled with water in the Monticello District, and a sample was obtained from <br /> the stream feeding into Glade Pit. <br /> A field measurement of pH was taken for each sample. An estimate of flow rate <br /> was made for waters discharging from mines. Water samples were analysed in <br /> the laboratory for gross alpha radiation, gross beta radiation, total uranium, <br /> radium-226, radium-228, arsenic, barium, cadmium, molybdenum, lead, selenium, <br /> and vanadium. <br /> ' DISCUSSION OF RESULTS <br /> U.S. Environmental Protection Agency (EPA) and State of Utah Drinking Hater <br /> Quality Standards are listed in Table 1 . Note that no standards exist for <br /> uranium, molybdenum, vanadium, or gross beta. The results of the water sample <br /> analyses are listed in Tables 2 and 3. The results of the mine drainage <br /> samples are given in Table 2 and the results of the stream samples and the <br /> Glade Pit samples are given in Table 3. <br /> + Comparison of results in Tables i and 2 shows that standards may be exceeded <br /> in mine drainage waters for four constituents: gross alpha, radium-226, <br /> arsenic, and selenium. <br /> Drainage water samples from all mines sampled exceeded standards for gross <br /> alpha activity. The Mt. Linnaeus s6 adit of the King Edward complex had the <br /> highest value found--3974 pCi/L compared to the drinking water standard of <br /> 15 pCi/L. <br /> Radium-228 values exceeded the drinking water standard at the Firefly, <br /> St. Patrick, Ring Edward (Mt. Linnaeus s6) , and Horseshoe al Mines. <br /> Arsenic standards were exceeded in drainage water at the toe of the Firefly <br /> waste dump and in the seep below the Little Don Mine at the Grey Daun complex. <br /> Selenium standards were exceeded in drainage water at the Firefly, Grey Daun, <br /> St. Patrick, and Brushy Basin i31 Mines. <br /> Permit limits for effluent discharges under the National Pollutant Discharge <br /> Elimination System (NvnESI are ear st-Ytc . l++ the state or Utah, the <br /> NPDES permit limit3 for dissolved uranium are a+ 1 !:e-=x: pC.- :!Lei- cmg/L) <br /> { 2 <br />