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2012-09-28_REVISION - M1977307 (23)
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2012-09-28_REVISION - M1977307 (23)
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Last modified
6/15/2021 2:25:47 PM
Creation date
10/23/2012 8:09:57 AM
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Template:
DRMS Permit Index
Permit No
M1977307
IBM Index Class Name
REVISION
Doc Date
9/28/2012
Doc Name
EPP Submittal- Ex. F to Emergency Response and Control Plan
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Cotter
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DRMS
Type & Sequence
AM1
Media Type
D
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No
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Formation, and the lower layer is the Entrada Sandstone based on structural contours <br />shown on the Geologic Map for the Davis Mesa Quadrangle (Cater, 1955). These test <br />borings were drilled with air rotary drilling rigs' and the drillers were instructed to note <br />wet or moist zones based on observations of the drill cuttings. While this is a subjective <br />observation and the results are not indicative of saturated conditions, it does indicate <br />where water, under either saturated or unsaturated conditions, is located in the subsurface <br />but provides no indication of the mobility of the groundwater. These "moist" zones <br />based on the drill logs are shown on Figure T2 as blue ovals. <br />As expected, the exploration holes targeted the ore zone with the bulk of the data defining <br />the "moisture" distribution in the overlying Brushy Basin member. While the majority of <br />test holes were dry, as shown on the well log found in Appendix II, there are numerous <br />"moisture" zones throughout the Brushy Basin. In hydrogeologic terms, the Brushy <br />Basin Member is defined as an aquitard - a term coined to describe the less - permeable <br />beds in a stratigraphic sequence (Freeze and Cherry, 1979). This is a classic definition of <br />a geologic unit incapable of providing a pathway for environmental exposure or recharge <br />for the underlying Salt Wash sandstones. As previously noted, the Brushy Basin is a rock <br />unit dominantly comprised of bentonitic shales (impermeable) with discontinuous lenses <br />of low - permeable sandstones and conglomerates. Any water in this formation would <br />cause the bentonite shales to swell and isolate lenses of sandstone and conglomerate <br />where water could potentially accumulate. Any fractures in the bentonite shales would <br />seal with moisture due to the expansive nature of the shales. Since meteoric water that <br />accumulated in isolated lenses of sandstone and conglomerate had to move through <br />impermeable bentonitic shale that dominates the lithology, the evidence suggests that this <br />water is connate. The definition of connate water is water trapped in sediments at the <br />time of their deposition (Freeze and Cherry, 1979). If this analysis is correct, the data <br />suggest that the water in the Brushy Basin was deposited in the Jurassic Period of earth's <br />history indicating that the age of the water is at least 145 million years old. This is a clear <br />indication that the Brushy Basin is not a pathway for exposure or recharge for the <br />underlying Salt Wash sandstones. <br />The distribution of moisture data from the borings shows limited vertical and horizontal <br />extent of water - bearing zones indicating that if saturated conditions occur in the <br />subsurface, these zones are isolated. Hydrologically, these isolated zones, if they were <br />saturated, would be referred to as perched water bodies. There is no indication that a <br />continuous groundwater pathway exists for the transport of uranium related constituents - <br />either in the Brushy Basin or the upper sandstone unit of the Salt Wash Member of the <br />Morrison Formation. <br />8.5 Geochemistry of Uranium Deposits <br />The next factor to consider for the potential mobilization of constituents associated with <br />uranium deposits is the geochemistry of the uranium deposits. For Colorado Plateau <br />deposits, the chief ore mineral is carnotite and it was initially believed by many to be a <br />primary sedimentary mineral, precipitated during or shortly after the deposition of the <br />enclosing sediments (Fischer, 1942). Carnotite is fully oxidized. The discovery of <br />O'Connor Design Group Inc. T - 14 <br />
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