2012-04-02_HYDROLOGY - C1981019 - Laserfiche WebLink

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Permit: Page 3 PART I t�. DEI'1NITION OF EFFLUENT LIMITATIONS L Effluent Limitatio Beginning no later than the effective date of this permit and lasting through the expiration date of the permit, the permittee is authorized to discharge from outfalls 001A through 0 1 2A the discharges froni sedimentation ponds- -all prior to entering state waters.ln accordance with the 'Mater Quality Control Commission Regulations for Effluent Limitations, Section 62.1, and the Colorado Discharge Permit System Regulations, Section 61.8(2), 5 G.C.R. 1002 -61, the permitted discharge shall not contain effluent parameter concentrations, which exceed the following limitations specified below or exceed the specified flow limitation. a. Outfalls 001A through 012A Parameter Discharge Limitations Maximum Concentrations 30-Day Avg. Daily Max. Flow, MGD Report Report Total Sus pen So i s nt 35 70 Oil and Grease m NA 10 H, sm. Miitiinuni- Maximum NA 6.5 -9.0 Settleable Sol m Report Report Tota Iron, m W nou i Dec 31 2007 3.5 7.0 Total Recoverbolt, Enu (Beginning January 1, 2008 1.0 Report 1 I Dissolved Solids m Report Report BTEX, m "002A only) Report 0.1 *BTEX monitoring will be required only if the Washbay Pond discharges into the Work Area Pond. ALTERNATE LIMITATIONS Any discharge or increase in the volume of a discliar me caused by precippitation with any 24 -hour period less than or eq ual to the 10- year 24 -hour precipitation event (or snowmelt of equivaent volume) m ay comply with the f limitations subject t0 tp of proof requirements described in Part I.A.3. Parameter Discharge Limitations Maximum Concentrations 30 -Da 6y . Daily Max. F ow MGD Report Report Tota Sus pen e So i s, nt Report Report Oil and Grease m NA 10 11 sm. iniznum- Maximum NA 6.59.0 Settleable Solids, nit/t Report 0.5 Tota Iron m / 1' iron i Dec 31 200 Report Report 'I otal Recovery le Iron, in Beginning January 1, 2008 Report Report I'oty L)jssolvecT Solids in I Report Report BTEX, m 002A oti ' Report 0.1 "B"I'EX monitoring will e required only if t to Wasp ay Pond discharges iarges into the Work Area Poii . Airy cliscliarge or increase tit volume of a discharge caused by recipiiation within any 24 hour period greater than the 10 -year, 24 -hour event (or series of storms or snowmelt of equivalent vohtnief may comply with the following limitations subject to burden of proof requirements described in Part I.A.3. Parameter Discharge Limitations Maximum Concentrations 30-Day Avg. Daily Max. F ow MGD Report Report Total Suspended Solids, m Report Report Oil and Grease in NA 10 H sm. Mutzlntntl- Maximum NA 6.5 -9.0 Settleable Solids, m Report Report Total Iron, mg /l (Through Dec 31 2007 Report Report Total Recoverable Iron, mg (Beginning January 1, 20 08 Report Repast Tota Disso ve Solids in Report Report BTEX m *002A on Report 0.1 FB'l EX monitoring will be required only it the Washbay Pond discharges into the Work Area Pond, 2. Alternate Limitatio Burden of Proof Requirements The permittee has the burden of proof when seeking relief front total suspended solids (TSS), total or total recoverable iron, and/or settleable solids (SS) lirtritations, as applicable. All Outfalls are eligible for relief fz•om'I'SS or total recoverable iron, and SS; however, the majority ofthe loading froni any discharge has to consist of storm ninoff for the relief to be available. The permittee will need to show that exceedence of the applicable limitations was caused by precipitation 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 grained when the permittee has control over the discharge. The permittee should endeavor to meet the primary limitations whenever possible. MODIFIED AND EFFECTIVE: JULYS 2007 EXPIRATION. 29 2010