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Whirlwind Mine Groundwater Characterization Report <br /> • Depth to water measurements should not be interpreted as static, but, in most cases, <br /> indicate that groundwater is present in the strata above the Salt Wash Member (this <br /> assumes that holes were purged dry of most injection water before measurement); and <br /> that this groundwater is associated with sandstone units in the Brushy Basin Member. <br /> • Only two holes (2 and 11) began injection at a shallow depth (less than 200 ft). This <br /> indicates that the Burro Canyon aquifer is not a prolific hydrostratigraphic unit in this <br /> area of Beaver Mesa. <br /> • Four holes (1, 3, 4, and 7) showed injection occurred at some depth below the upper <br /> Brushy Basin sandstone unit but above the lower sandstone unit. The upper Brushy <br /> Basin sandstone can be interpreted as water-bearing in these holes (or groundwater <br /> occurs at some depth above the lower sandstone unit). <br /> • Four holes (6, 10, 12, and 13) showed injection at a depth below the lower Brushy Basin <br /> sandstone. This indicates that the upper Brushy Basin sandstone is not a widespread <br /> prolific hydrostratigraphic unit in this area of Beaver Mesa. <br /> 4.2.1.6 PR Spring and Packrat Mine <br /> WWL was not able to access the Packrat Mine for this study in adherence of state and federal <br /> agency protocols during temporary cessation. Therefore, WWL relied on historical information <br /> related to the mine, much of which was included in the mine permit. <br /> U.S. Environmental Services, Inc. (USES) on behalf of Umetco, conducted an evaluation of the <br /> hydrologic relationship between the Packrat/Hubbard Mine and PR Spring using data collected <br /> in the 1990s and 2000. This was done to support a request by the Colorado Department of <br /> Public Health and Environment (CDPHE) related to discharge permitting at the mine and spring <br /> sites. <br /> USES described the geology of the PR Spring and Packrat Mine area. The mine is in the upper <br /> part of the ore-bearing sandstone of the Salt Wash Member and is stratigraphically separated <br /> Western Water& Land, Inc. 20 <br />