2001-12-11_PERMIT FILE - C1980007A ‎(4)‎

• Permit No: C1980007A
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: Old Permits
• Section_Exhibit Name: Exhibit 07 NPDES Permits
• Media Type: D
• Archive: Yes

PART I
Page 6
Permit No. CO-0038776
• A. TERMS AND CONDITIONS
2. Burden of Proof Requirements
The permittee has the burden of proof when seeking relief from total suspended solids (TSS), total iron and/or settleable
solids (SS) limitations. Discharges From ou[falls 007, Ol I, 012 and 013 are not eligible for [his exemption. Ou[falls 002
and 004 aze eligible for relief from TSS, total iron and SS; however, the majority of the loading from any discharge has to
consist of storm runoff for the relief to be available. The permittee will need to show that ezceedence of the applicable
limitations was caused by precipitation and not mine water, through a comparison of the loading from each source. The
remaining permitted outfalls (005, 006, 008, 009, 014 and 015) are eligible for relief from TSS, T. Iron and SS a[ all
times since only surface runoff dischazges are authorized from these outfalls.
Relief may be granted for each discharge occurrence only when necessary and shall not be granted when the permittee has
control over the discharge. The permittee should endeavor to meet the primary limitations whenever possible.
a) For rainfall. to waive TSS and total iron limitations, it is necessary to prove that dischazge occurred within 48 hours
after measurable precipitation has stopped. In addition, to waive settleable solids limitations, it is necessary to prove
that discharge occurred widin 48 hours after precipitation greater than the 10-year, 24-hour event has stopped.
b) For snowmelt. to waive TSS and total iron limitations, it is necessary [o prove that discharge occurred within 48 hours
after pond inflow has stopped. In addition, to waive settleable solids limitations, it is necessary to prove oho[ discharge
occurred within 48 hours after pond inflow volume greater than [he l0-year, 24-hour event has stopped.
Should a precipitation event or snowmelt occur, the permittee shall submit adequate proof m order For an exemption [o be
claimed. Weather station data may be appropriate in making this demonstration. Said proof shall be submitted as an
attachment [o the Discharge Monitoring Report (DMR) for the appropriate period. The Division shall determine the
adequacy of proof. As pan of this determination, the bivision shall evaluate whether [he permittee could have controlled
the discharge in such a manner that primary limitations could have been met. All manual dewatering of the ponds shall
meet TSS and total iron limitations.
•
3. Post-Mining Areas
Commencing at the time active mining has ceased and surface azeas have been returned to the required contour and
revegetation has begun, applicable discharges may be eligible for limitations other than those specified in Pans I.A. 1.
These post-mining limitations shall remain in effect until bond release. The permittee shall notify the Division at the
appropriate time so that consideration of permit modifications can be made.
4. Salinity Parameters
In order to obtain an indication of the quantity of Salinity being discharged from the site, the permittee shall monitor the
wastewater effluent at [he following frequencies:
u all Frequency
002, 004, 005, 006, 008, 009, 011, 012, O13, O14, 015 Quarterly
Sample Tvoe
Grab
Self-monitoring samples taken in compliance with the monitoring requires specified above shall be taken at those locations
listed in Part I.B.I. Total Dissolved Solids shall be sampled on a quanerly basis. The permittee is required to submit a
repott addressing salt removal in accordance with [he Regulations For [~lementation of the Colorado River Salinity
Standards Through the NPDES Permit Program, 3.10,0 (see Part I.A.S.).
5. Compliance Schedule -Salinity Report
The permittee shall submit to the Division by De em I 195, a repott addressing the economic feasibility of achieving
no salt in all dischazges or, if that is no[ feasible, minimizing the salt in all discharges from this facility. The report shall
address these two points:
The cost of modifying all existing treatment facilities to provide for no salt discharge;
The cost of salt minimization from all treatment facilities (to achieve combined discharge equal to or less than one ton
of Total Dissolved Solids per day).
See Part i.C. for Definitions.
Amendment No. 2 Issued FEB 7 9. 1 997 Effective APR O 1 . 1 997