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PERMFILE113237
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PERMFILE113237
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Entry Properties
Last modified
8/24/2016 10:09:25 PM
Creation date
11/24/2007 10:22:03 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981010A
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Doc Name
pages 4-233s to 4-248b
Section_Exhibit Name
4.8 Hydrologic Impacts Part 3
Media Type
D
Archive
Yes
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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 grountlwater 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 />Impacts to adjudicated wells (see Mao M311 <br />One First White Sandstone well, W-1406-78, exists north of the Colt and Browning Pits. This well is <br />approximately 3700 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 wnnection 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 While <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 qualify 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 aquifer exists only in the far northern portion of mining in the Browning and CoR pit <br />areas. Well 85775-A is located approximately two miles from this mining. A noticeable drawdown from <br />the Browning pit mining did not develop at this well. The Second White Sandstone does not exist in the <br />Deninger, 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. Wel! 031820 does not still exist. Little if any effect at well 93848 is expected. The physical <br />4-238f ,,;,r..c,;~(;T ~ v LUl)~ <br />
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