My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
REV04364
DRMS
>
Back File Migration
>
Revision
>
REV04364
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
8/25/2016 1:02:28 AM
Creation date
11/21/2007 9:17:17 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980003
IBM Index Class Name
Revision
Doc Date
2/27/1998
Doc Name
Phase II/III Bond Release App, TOC, Sec. 1 Thru 3 & Tables
Type & Sequence
SL3
Media Type
D
Archive
No
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
36
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
View images
View plain text
Febrsury 7998 Hayden Gulch Mine `Phase 1 fi 3 Bond Release Application • Pa,Qe 76 <br />Summary of Water Quality Analysis <br />• As discussed in the HIA, some constituent concentrations, primarily ammonia, iron, sodium, <br />sulfate and TDS, at some locations, have exceeded baseline concentrations. However, observed <br />constiruent concentrations have generally been less than applicable water quality standards. <br />The temporal analysis indicates that water quality has remained constant during the <br />reclamation liability period. Tn addition, a comparison to use-suitability guidelines indicates <br />that all mine site and vicinity waters aze acceptable for their current or expected future <br />beneficial uses. <br />In conclusion, the HIA indicates that: <br />• Spoils seep and spring flows have increased within the range predicted in the approved <br />PHC. The PHC predicted a peak flow discharge of between 117 gpm and 408 gpm and <br />HGCC observations indicate recent spoil spring discharges of approximately 130 gpm; <br />• The quality of surface water in ponds HG-8 and 003 is suitable for post-mining use by <br />livestock and wildlife; <br />• No use-limitations for off-site surface waters despite sodium, sulfate and TDS levels at <br />HG8, RSP-4 and LHG which were slightly higher than baseline values; <br />• Potential salt loading at Williams Fork was less than 3 percent; <br />• Ground water levels at the mine site increased and appeaz to be approaching pre-mining <br />conditions; <br />• Ground water quality in wells HG-1 and HG-2 is similar to baseline ground water <br />quality and while of poor quality; does not limit potential future uses; <br />• Water quality in seeps outside of the mine disturbance boundary is similar to baseline <br />conditions; <br />• On-site impacts have been minimized; <br />• Potential off-site impacts and material damages have been prevented; and, <br />• The impacts are consistent with the predictions made in the approved PHCs and CHIS <br />(NERD, 1987). <br />Therefore, it is HGCC's opinion that the mining activities at the Hayden Gulch mine have <br />not, and will not impact the hydrologic resources in the vicinity of the reclaimed mine. <br />6) An Analysis O(Subsidencelmpacts: <br />The Hayden Gulch Mine was a surface mine and consequently there has been <br />no subsidence. <br />• <br />Montgomery Watson Americas (dba TmaMatrixJ • PO. Boz 774018 <br />Steambpat Springe, Colorado 80477 • (970J 8796160 <br />V~\IJTI1ly }GJ dnd RAuieAryYtm,\TmVY`vl6J 6+JR/u~Ary4~ew <br />lR!/II J. <br />
The URL can be used to link to this page
Your browser does not support the video tag.