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• diagram. Trilinear diagrams are used to show the ratios of the major ions in each type of water. The <br />compositions of most natural waters can be closely approximated in terms of three cationic species <br />(calcium, magnesium, and sodium plus potassium) and three anionic species (sulfate, bicarbonate, and <br />chloride). By converting the concentrations from milligrams per liter (mg/L) to milliequivalents per <br />liter (meq/L) and then expressing the individual values as percentages of the total meq/L of cations and <br />of anions, the composition of water can be represented conveniently in a trilinear diagram. <br />6.1 Burro Canyon Aquifers <br />The Burro Canyon Formation is the primary surface outcrop on Beaver Mesa and is approximately <br />100-210 feet thick on the mesa (Cater, 1955). Figure GS shows the stratigraphy of the lower 105 feet <br />of the Burro Canyon Formation from Boring BM-001. The log shows that the formation is mostly <br />sandstone with one mudstone bed located approximately 50 feet from the base of the formation. The <br />upper portion of the underlying Brushy Basin consists primarily of mudstone, which forms an aquitard <br />to the downward flow of ground water. <br />The BLM Well that is located approximately one mile west of the Whirlwind Portal in Utah is <br />completed in the Burro Canyon Formation. This well, also known as the Dolores Point Well, was <br />drilled in 1981 and has been producing a reported 15 gallons per minute for livestock use on an <br />intermittent basis. The well, which is at a surface elevation of approximately 7,450 feet, was completed <br />to a depth of 150 feet with the main water source and pump located between 100 and 115 feet below <br />ground surface (bgs) in a coarse sandstone aquifer. The deepest portion of the well from 120 to 150 <br />feet bgs consists entirely of Brushy Basin shales and mudstones. A smaller aquifer is located in a five- <br />foot-thick limestone bed at 75 to 80 feet bgs. The static water level in the well is 75 feet bgs according <br />to the well driller's report. <br />The BLM Well was sampled by Energy Fuels on Apri126, 2007. The sample was collected after the <br />well was pumped for 30 minutes at approximately 12.5 gpm. The laboratory analysis, presented in <br />Table E-1, indicates that the water is of good quality with a total dissolved solid (TDS) concentration <br />of 344 mg/L, low metal concentrations, and radium activity levels below detection limits. As shown on <br />Figure G6, the BLM Well water is predominantly a calcium bicarbonate water. The water quality and <br />r~ <br />Whirlwind Mine 07 (rev. April 08) G-8 <br />