2009-01-12_PERMIT FILE - C1996083 ‎(2)‎

• Permit No: C1996083
• IBM Index Class Name: Permit File
• Doc Date: 1/12/2009
• Section_Exhibit Name: Volume IIIA Exhibit 11 Colorado Discharge Permit -NPDES
• Media Type: D
• Archive: No

d. Outfa11004
Effluent Parameter
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PART I
Page No. 5
Permit No.: CO-0044776
Effluent Limitations
Maximum Concentrations
]!1 Il.... •.~.. _..,... 7 T.... A.,n..n..n lln:ly RiTn vi m~~m
0.0115
NA
_.m,_. _.._._..._45 ...~..
45
~~12000 c1
_ _N_A_
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NA
Report
NA
NA
____._ .............._..NA...._.......~..........__.
__._.___.._..._-_0.5 ._._..__._.._.
...__~ _-_6.5-9 _,_.__.._..
Report
5-day Biochemical Oxygen Demand (BODs), mg/1~ 30
Total Suspended Solids (TSS), mg/1 r 30
..._..__..__ .................~_.. _...-- _....._.._......__-_ _-_ ____..._.....__.._...__..__.._..............._...._ _ _.........._i...._......._._ _.._...__....__.._~. _...
Fecal Coliform Bacteria, Number/]00 mi ± 6000 c/
Total Residual_Chlorine, mg/1 1 NA
pH, s.u. (minimum-maximum) --_.__..._....__.._.____._._.__~__.__.__._....-_NA_._
Oil and Grease, mg/l..T_ _......__..___._...__._._..__.~_...._..____..._....NA.._...-
Total Dissolved Solids, mg/1 ; Report ' NA
_....__.___. _..._--..-------._.__..._._........_....._....._...__._...__..._.._..__~_..___....._._....._._.__.._..__..._.....__...._..---._._.__.._..__.....___t__._.__...._.._..._.__._.__-..._.
2. Whole Effluent Toxicity -Chronic Lethality Limitation - Outfa11006 and 010
Beginning immediately and lasting through the expiration date, there shall be no statistically significant difference in lethality
(at the 95% confidence level) between the control and any effluent concentration at outfalls 006 and O 10 less than or equal to
100%% effluent. Such limitation shall apply as a daily maximum.
See Part I.C. for Definitions.
3. Alternate Limitation 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, as appropriate for outfalls containing surface runoff water. All outfalls except 004, 006, and 010 are
eligible for relief from TSS, total iron and SS, as applicable; 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 exceedance of the applicable
limitations was caused by precipitation (surface runoff water) and not mine water, through a comparison of the loading from
each source.
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 active outfalls: For rainfal}, to waive TSS and total iron limitations, it is necessary to prove that discharge occurred
within 48 hours after measurable precipitation has stopped. In addition, to waive settleable solids limitations, it is
necessary to prove that discharge occurred within 48 hours after precipitation greater than the 10-year, 24-hour event has
stopped. For snowmelt, to waive TSS and total iron limitations, it is necessary to prove that discharge occurred within
48 hours after pond inflow has stopped. In addition, to waive settleable solids ]imitations, it is necessary to prove that
discharge occurred within 48 hours after pond inflow volume greater than the l0-year, 24-hour event has stopped.
b. For post-mining outfalls: For rainfall, to waive settleable solids limitations, it is necessary to prove that discharge
occurred within 48 hours after measurable precipitation has stopped. For snowmelt, to waive settleable solids limitations,
it is necessary to prove that discharge occurred within 48 hours after pond inflow has stopped.
Should a precipitation event or snowmelt occur, the permittee shall submit adequate proof in order for an exemption to be
claimed. Weather station data may be appropriate in making this demonstration. Said proof shall be submitted as an
attachment to the Discharge Monitoring Report (DMR) for the appropriate period. The Division shall determine the
adequacy of proof. As part of this determination, the Division shall evaluate whether the permittee could have controlled the
discharge in such a manner that primary limitations could have been met. All manual dewatering of ponds that are equipped
with automatic dewatering systems must meet TSS and total iron limitations. If a pond has only manual dewatering
capability, relief is available only to the extent required to regain necessary stability and capacity.
4. Post-Minine Areas