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• Water quality in natural springs is not expected to be impacted by the Trapper Mine. The water quality in <br />Fox Den spring will likely not be affected in post-mine conditions because the base of the Third White <br />Sandstone is expected to be above the recovered backfill aquifer water level in this vicinity. If the source <br />of the Fox Den spring is a deeper aquifer, no water quality effects should occur as mining will not impact <br />deeper aquifers in this area. The water quality in the North Horse Gulch spring is not expected to be <br />affected by Trapper mining because the mining extends only to the top of the drainage divide and not into <br />the Horse Gulch drainage. <br />Detailed discussions of selected groundwater quality constituents are presented in the Annual Hydrologic <br />Reports (Appendix W ). These discussions take into account all of the most recent data along with the <br />historical information. <br />Imoacts to adjudicated wells (see Mao M31) <br /> <br />A discussion of groundwater inflow impacts to adjudicated wells can be found on pages 4-226a <br />through 4-226d. <br />One First White Sandstone well, W-1406-78, exists north of the Colt and Browning Pits. This well is <br />approximately 370D feet north of the edge of Browning Pit (Appendix V, Part D). The First White <br />Sandstone crops out north of the northern end of the Browning pit. The southern limit of the First White <br />Sandstone is approximately 1100 feet north of the northern end of Browning pit (Appendix V, Part D). <br />Impacts from mining would either have to be transmitted from the Second or Third White Sandstone <br />through shales to the First White Sandstone aquifer, or through direct contact of surface impacted waters <br />with the First White Sandstone aquifer. It is unlikely that an adequate vertical connection exists between <br />the Second and/or Third White Sandstone, and the First White Sandstone, to result in negative impacts. A <br />• very limited potential exists for surface water runoff derived from spoil springs to contact the First White <br />Sandstone although no significant spoil springs have yet been identified in this area. <br />During 1988, First White Sandstone monitoring well, GLUX-1, was established to evaluate water quality in <br />this aquifer downgradient of the Colt and Browning pit areas. Map M52 depicts the actual location. No <br />water quality impacts are evident at this site to date. <br />Second White Sandstone well 85775-A exists west and north of the Colt and Browning pits. The Second <br />White Sandstone aqu'rfer exists only in the far northern portion of mining in the Browning and Colt pit <br />areas. Well 85775-A is located approximately two miles from this mining. A noticeable drawdown from <br />the Browning pii mining did not develop ai this well. The Second White Sandstone does not exist in the <br />Derringer, Enfield, or Flintlock pits. The Second White Sandstone is probably not saturated in the area of <br />the Ashmore pit in the Pyeatt or Flume Gulch drainages. Therefore, wells completed in this aquifer are <br />not expected to be impacted by the Trapper Mine. <br />Third White Sandstone wells 93848 and 031820 are documented to be located in the area of the Colt and <br />Browning pits. Well 031820 does not still exist. Little if any effect at well 93848 is expected. The physical <br />• <br />~c~~iin,;; P2-~ <br />~~~f,,ro~,;_.~: o p3 <br />4-238f <br />