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COLORADO DEP.4RT;NE~`rl' OF PUBLIC KE.4LTTl AND E~WlRONMEM, Water Quality Comro[ Division <br />Amendment No. 4 -Rationale. Page 6, Permit No. CO-0038776. <br />C. Typographical Correction <br />When amendment number 2 was issued in February, 1997, page 5 of the permit was inadvertently replaced with a <br />copy of page 6. This resulted in rite omission of the effluent limitations for outfall 012, t/te chronic WET limitation <br />section for autfal! 0!2 and the effluent limitations for outfal1007. lhis amendment no. 4 will reinstate the correct <br />page 5. <br />D. Permit Page Changes <br />As a result of [his action, pages 3 through 14 of the permit are being amended. Also. Figure 2 on page 26 is <br />amended to show ne}v ourfal[ Ol6 and deletion of former autfalls 002 and 006 and new Figure 10. page 30d, is <br />added ro show locations of new outfalls 017 and 018. <br />E. Regulatory Changes <br />Zhe CWQCC recently adopted an overall renumbering of all applicable rules and regulations. Any regulatory <br />references in the amended pages have been revised in accordance with this renumbering. <br />Jon C. Kubic <br />October 31, 1997 <br />• VI. PUBLIC NOTICE COtVIMENTS <br />The permittee submitted verbal comments. They indicated that the culvert that transports effluent to the North Fork of <br />the Gunnison River is a mine road culvert, rtat a Colorado Department of Transpanatiort road culvert as described <br />herein. Ihis is being corrected. Also, they requested that the description of the new mine water treatment facility be <br />abbreviated as "bfW Miirl'F" instead of "MW WWTF" as shativn in the draft amendment. As this is more accurate, the <br />change will be made. <br />An internal review of the draft amendment noted that segment 6 has no total recoverable iron standard but does have a <br />dissolved iron standard for water supply protection. Zhis segment has a ;ero annual low flow value, thus applicable <br />dissolved iron limitations would equal the standard. Flotivever, this facility's discharges vary significantly on a seasonal <br />basis, making comparison to the annual law flotiv inappropriate. To facilitate a more complete seasonal evaluation of <br />the dissolved iron leveLr from this facility's discharges to this segment, the Division will require dissolved iron <br />monitoring of outfal[s 011, 013 and 017 -the mine water discharges to that segment. Monitoring of surface runoff <br />discharges will not be required because surface runofjdischarges occur during high flow conditions. Ibis monitoring <br />will be added to rite final version of this amendment and remain in place until/unless it is demonstrated that there is no <br />longer aconcern. /t should be noted that Cher are presently no known domestic water uses for this }voter prior to the <br />point of canfiuence with the North Fork of the Gunnison River. This additional monitoring has been discussed verbally <br />with the permittee and they stated that they have na abjection to it. <br />Jon C. Kubic <br />February 3. 1998 <br />• <br />