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Given that all information from Flaming Gorge Reservoir (except TDS) is from 1973 -1974, it <br />could be assumed that the presently stored water is of somewhat better quality. <br />Water Quality <br />TDS information for three profile sample sites located on Flaming Gorge Reservoir below Marsh <br />Creek (TDS was estimated as 0.67 * EC) was collected between August, 1980 and October, 1989 <br />by the US Bureau of Reclamation. Detailed reservoir water quality information is limited to <br />USGS samples taken between 1973 and 1974. The Green River monitoring station at Greendale, <br />Utah provides the most extensive and most representative water quality data archive. <br />TDS values in Flaming Gorge Reservoir generally deteriorate with greater depth, ranging from a <br />low of about 220 mg /l up to a high just over 600 mg/l. More common values are in the range of <br />approximately 350 to 480 mg /1 at reservoir depths that would likely be targeted. This range of <br />TDS levels is substantiated by readings at the Greendale, Utah monitor station located about 35 <br />miles downstream of the dam. <br />TDS levels at the Greendale station spiked in 1963, which is reflective of the dam opening and a <br />non - equilibrium flushing of salts from the reservoir basin. This is followed by other spikes in <br />the 1970's which reflect development of the chemocline, and the subsequent trend of water <br />quality improvement after the operational changes were initiated in 1982. <br />Treatment <br />The water is judged to be suitable for municipal use and treatable by standard water treatment <br />processes with TDS levels expected to average well below the EPA's maximum contamination <br />level of 500 mg /1. <br />Data Summary Items <br />The following pages provide summary items of relevant information, as follows (see <br />corresponding ITEM # header /footer): <br />1. Regional map with monitoring site locations. <br />2. Pool Elevation (1980 -2004) <br />3. Reservoir water quality data (1980 -1989 profile data, Depth vs. TDS) <br />4. Green River TDS and Flow at Green River, WY monitoring station. <br />5. Green River TDS and Flow at Greendale, UT monitoring station. <br />6. Green River TDS at Browns Park, CO monitoring station. <br />7. Green River at Greendale, UT water quality (filtered *) compared to EPA drinking water <br />standards. <br />8. Green River at Greendale, UT water quality (unfiltered *) compared to EPA drinking <br />water standards. <br />9. Available Flaming Gorge Reservoir water quality (limited to 1973 -1974 data) compared <br />to EPA drinking water standards. <br />10. Full detailed summary of Greendale, Utah monitoring station data. <br />Page 2 of 3 <br />