2011-06-17_PERMIT FILE - C1981018

• Permit No: C1981018
• IBM Index Class Name: Permit File
• Doc Date: 6/17/2011
• Doc Name: Water Discharge Permit
• Section_Exhibit Name: Illustration 46
• Media Type: D
• Archive: No

PART I
Page No. 11
Permit No.: CO- 0038024
f. Spontaneous Disappearance
•
If toxicity spontaneously disappears at any time after a test failure, the permittee shall notify the Division in writing
within 14 days of a demonstration of disappearance of the toxicity. The Division may require the permittee to develop
and submit additional information, which may include, but is not limited to, the results of additional testing. If no pattern
of toxicity is identified or recurring toxicity is not identified, the toxicity incident response is considered closed and
normal WET testing shall resume.
g. Toxicity Reopener
This permit may be reopened and modified (following proper administrative procedures) to include new compliance
dates, additional or modified numerical permit limitations, a new or different compliance schedule, a change in the whole
effluent toxicity testing protocol, or any other conditions related to the control of toxicants if one or more of the following
events occur:
i. Toxicity has been demonstrated in the effluent and the permit does not contain a toxicity limitation.
ii. The PTI/TIE results indicate that the identified toxicant(s) represent pollutant(s) that may be controlled with specific
numerical limits and the permit issuing authority agrees that the control of such toxicants through numerical limits is
the most appropriate course of action.
iii. The PTI/TIE reveals other unique conditions or characteristics, which, in the opinion of the permit issuing authority,
justify the incorporation of unanticipated special conditions in the permit.
3. Storm Exemption - Facilities Permitted to Discharge
If the permittee intends to use the 10 -year, 24 -hour storm exemption, a report must be submitted to the Division within 90
• days after the effective date of this permit, documenting that the facility is designed, constructed and will be maintained to
contain or treat:
a. The maximum volume of wastewater which would be generated by the facility during a 24 -hour period without an
increase in volume from precipitation; and
b. The maximum volume of wastewater resulting from a 10 -year, 24 -hour precipitation event, including the volume which
would result from all areas contributing runoff to the individual treatment facility (i.e., all runoff not diverted from the
active mining area or the mill area).
In addition, if a discharge occurs as a result of the 10 -year, 24 -hour storm volume being exceeded and the permittee wishes to
claim an exemption from technology based effluent limitations, the permittee shall submit, within 5 days of the said discharge,
documentation that the facility was maintained to contain or treat the previously specified volumes. The permittee must also
submit documentation of the storm event, including the precipitation recorded at the closest official precipitation gauge
station (or the permittee's own gauge), the volume of runoff produced and the steps taken to maintain treatment and minimize
the amount of overflow.
For claiming a storm water exemption, the permittee must also adequately demonstrate that all reasonable management,
containment, and treatment options have been optimally utilized.
The storm event exemptions are only applicable for the following parameters at this facility, which are based upon Federal
BAT /BPT.limitations: total suspended solids, total.iron, and/or settleable solids.
All data/documentation required by the section which can not be reported on applicable discharge monitoring report forms
(DMRs) shall be reported in a letter as an attachment to the DMR. Submittal of documentation of containment, maintenance
and'precipitation records above does not exempt the permittee from the notification requiremenfg—ofPaarrll A , 4 oftfiis"
• permit.
4. Storm Exemption - Facilities Not Permitted to Discharge