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REP52856
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REP52856
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Entry Properties
Last modified
8/25/2016 12:57:21 AM
Creation date
11/27/2007 1:29:33 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980001
IBM Index Class Name
REPORT
Doc Date
9/28/2007
Doc Name
2006 AHR Review Letter
From
DRMS
To
Chevron Mining Inc
Annual Report Year
2006
Permit Index Doc Type
Hydrology Report
Media Type
D
Archive
No
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Ground Water Monitoring Site <br />TR-4, a e 3 of 3 <br />WR-1, level and quality ,West Ridge <br />(base) 4.6-141 1, 30-51, Appendix B, Ground <br />Water Elevations, page 3 of 3; <br />Ground Water Monitoring Site <br />WR-1, a e 3 of 3 <br /> <br />slo a stabili round water <br />215W and L, level, Moffat, NW 4.6-145 1, Appendix D, Moffat Area <br />218 W and L, level, Moffat, NE 4.6-145 Wells, page 3 of 3 <br />8925 and L, level and quality ,Moffat, <br />SW 4.6-146 <br /> <br />Trout Creek Sandstone <br />TCS-1 uali ,annual) , 3` eriod 4.6-148 56, A endix F, Pa e 1 of 1 <br /> <br />S rin and See Surve <br />Western edge, West Ridge, May or after <br />snow melt 4.6-145 53, Appendix C, Exhibit 1 <br />' See Table 4.6-54, page 4.6-144 of the PAP for pazameters and frequency (partial monthly, April <br />through October, complete 3/yeaz). <br />Review of Predicted Probable Hydrologic Consequences <br />No direct disturbance of the quantity of water in Trout or Oak Creeks was anticipated to occur <br />(PAP page 2.5-96). Post-mining contributions to flows in Trout and Oak Creeks from the permit <br />area will be unchanged from that which now exists (PAP page 2.5-98). The quantity of water <br />discharged from the mine site after reclamation was predicted to nearly remain unchanged from <br />pre-mining conditions after reestablishment of hydrologic regimes (PAP 4.6-61 a). Such appeazs <br />to be the case. <br />With regazd to the Trout Creek drainage, spring and seep flows increase with snow melt and then <br />taper off, indicating that backfilled azeas have become spoil aquifers in equilibrium with charge <br />and discharge cycles. As revegetation of reclaimed becomes more and more representative of <br />pre-mining vegetative cover, and as reclaimed surfaces are similar in topography to pre-mining <br />conditions, surface runoff likely approaches pre-mining levels. The difference at this time is that <br />surface runoff is collected and directed to sedimentation ponds, with point dischazges. For most <br />of the site, these point dischazges are representative ofpre-mining drainage discharges, and the <br />ponds have been permitted as permanent features. As the ponds are generally full, inflow is <br />equivalent to discharge. Any infiltration of precipitation over and above pre-mining conditions is <br />likely recovered in the spoil spring discharges. <br />Disturbed areas of the Oak Creek drainage have been reclaimed to the requirements of the <br />reclamation plan, and sedimentation ponds have been removed. There is no post-mining <br />condition that would deplete runoff from these azeas from pre-mining conditions. Flows in Oak <br />Page 5 <br />
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