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GENERAL31467
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Last modified
8/24/2016 7:54:36 PM
Creation date
11/23/2007 7:01:04 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981031
IBM Index Class Name
General Documents
Doc Date
11/14/2005
Doc Name
Proposed Decision & Findings of Compliance for SL1
From
Termination of Jurisdiction
Permit Index Doc Type
Findings
Media Type
D
Archive
No
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Ground Water Impacts <br />No known data exists to document ground water impacts at this site. Spoil springs <br />have not been documented in the past at this mine nor were any noted during the final <br />inspection. Pre-law mining in the general area has likely influenced the ground water <br />regime regarding quality and possibly quantity. Due to the small size, shallow <br />mining depth, and nature of the disturbance caused by the New Pryor Mine, any <br />further degradation by activities at New Pryor would be negligible. <br />Surface Water Impacts <br />Sediment ponds remain as permanent impoundments at this site. Any runoff from <br />the site would be limited to snowmelt or rainfall runoff. Vegetation appears to be <br />successful in stabilizing the soil profile assuming proper land management practices. <br />Should any minor erosion occur, significant sediment treatment capacity remains in <br />the two permanent ponds. Any dischazge of water would likely be treated to an equal <br />or better condition as compared to runoff from surrounding and adjacent lands. <br />Findings on Protection of Hydrologic Balance <br />Given the lack of water in general at this site, the Division finds that the New Pryor <br />Mine has minimized disturbance of the hydrologic balance in the mine plan and <br />adjacent areas, and has prevented material damage outside the permit area. The <br />Division also finds that the New Pryor Mine has not caused hydrologic changes that <br />adversely affect the approved post-mining land use in the permit area. <br />Permanent Pond Demonstration <br />Two sediment ponds remain at the site. With the exception of the faz southern end of <br />the reclamation, all reclaimed azea drains to one of these permanent impoundments. <br />Significant capacity remains for water and sediment retention in both ofthese ponds. <br />The locations of the ponds will assist in keeping grazing animals dispersed over the <br />revegetated azea. Pond A, along the eastern edge of the reclaimed azea, is very small <br />and is no threat to downstream structures, people, or property. No instability or sign <br />of damage was observed in the pond A embankment. Pond K, on the north side of <br />the reclaimed area, is a larger structure that has the ability to detain storm runoffprior <br />to dischazge through a principle spillway. An emergency spillway exists in tandem <br />with this primary spillway. Evidence suggests that the spillways have functioned <br />without incident over the revegetation liability period. However, in the event the <br />embankment was compromised, conditions downstream were investigated. Review <br />of available aerial photographs taken by the Division indicate in the event storm <br />runoff was to overtop the pond K embankment, flow would enter Pryor Canyon, <br />where it would flow to the east towazd the county road. If flows were somewhat <br />larger than the channel itself, these flows would not impact any structures, homes, or <br />jeopardize safety of adjacent landowners. Flows might temporarily flood around a <br />13 <br />
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