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1995-06-07_ENFORCEMENT - M1977378
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1995-06-07_ENFORCEMENT - M1977378
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Last modified
2/9/2021 6:59:14 PM
Creation date
6/25/2012 11:43:17 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1977378
IBM Index Class Name
ENFORCEMENT
Doc Date
6/7/1995
Doc Name
Draft Consent Decree
From
AGO
To
DMG
Media Type
D
Archive
No
Tags
DRMS Re-OCR
Description:
Signifies Re-OCR Process Performed
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PROM :AGO NAT. RES. SECTION 303 832 810E 1995 ` G-07 06:16 #57S P. 10/18 <br /> d. Potential Adverse Effects by Others. Should new adverse effects on the <br /> Upper Animas Basin occur through man-made or natural causes, SGC will monitor these <br /> causes so that a mathematical adjustment can be made to the reference point water quality <br /> in the Animas River below Silverton. <br /> 6. Water Quality Reference Point <br /> SGC will be released from its permits when information exists to calculate that the dissolved <br /> zinc criterion at the water quality reference point will not be exceeded if treatment of Cement <br /> Creek is stopped. The water quality reference point criteria are set forth in Appendix <br /> This calculation will be carried out based on monthly sampling to determine how the Upper <br /> Animas Basin is reacting to voluntary mitigation. Based on this calculation SGC will be released <br /> from its permits when water treatment is stopped,without long-term monitoring. <br /> The reference point will be at the WQCD's sample point AR-72 below Silverton near an <br /> established USGS gauge and below the confluence of Cement and Mineral Creeks with the <br /> Animas River. The point will be sampled as described above and will only serve to indicate <br /> whether the voluntary mitigation projects are working,whether treatment of Cement Creek is <br /> necessary and whether SGC has completed enough mitigation after the mine pool has stabilized <br /> to be released from its CDPS/NPDES permits(including stormwater requirements). <br /> 7. Schedule <br /> SGC expects the final mine pool elevation to be at equilibrium at approximately 11,500 feet <br /> above mean sea level. Volume calculations of natural mine flooding predict that the mine water <br /> level will substantially reach equilibrium in one to ten years. <br /> SGC can pump an additional 200+gallons per minute into the mine pool during summer months, <br /> thus shortening the total fill time by about 12%of total gallons for each year that water is <br /> pumped into the mine. If SGC pumps additional water into the mine,total fill time would be <br /> reduced by about 12%per year of pumping,and fill time may be reduced to between one year <br /> .,<. and four years. <br /> The terms of SGC's MLR permit require two years of monitoring,after the mine pool water level <br /> has reached equilibrium,prior to considering the project successful. The two years will allow for <br /> detection and evaluation of any short circuits of waters that might emanate from the Sunnyside <br /> workings and.to-emote the property line plug. After the property line plug is determined <br /> 8 <br /> o <br />
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