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PART
<br />Page No.
<br />Pertni[ No.
<br />B. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
<br />• 1. Effluent Limitations
<br />b. Post-Mining Outfalls
<br />Post-mining limitations may apply to outfalls serving swface azeas, which have been returned to the required contrw and on.
<br />revegetation (specifically, seeding or planting) work has commenced. The pemtittee may request consideration for change
<br />active muting limitations to post-mining limitations when these conditions have been met.
<br />POST-MINING PRIMARY LIMITATIONS
<br />.. ,, ..
<br />s." _,.,_._ ~=-Parameter. j~ r,-,..~_. .. _s ~. ~....: >.y__...: ..-__`Liffitahon_~ _.W_.=~:_..
<br />Flow, MGD Report
<br />•Settleable Solids, mUl 0.5
<br />pH, s.u. 6.5-9.0
<br />Oil and Grease, mg/f 10
<br />Total Dissolved Solids, mg/1•• Report
<br />Total Phosphorus (as P), mg/I••• Report
<br />POST-MINING ALTERNATE LIMITATIONS
<br />Any discharge or increase in the volume of a dischazge caused by precipitation within any 24-how period Rreater than the 10-veaz.
<br />24-how nrecipitation event (or snowmelt of equivalent volume) ~ comply with the following limitations -- subject to bwden of
<br />proof requirements descnbed in Part I.B.I.d).
<br />:is _M:-.~..,. .~s3 :.{.-.s_-...~:..'s Pai81ffitCr -,-.vv..~~~._r,..:.es..e_,x*v_,,."..« ~~~....s~:._..,.~.~:'.'a~_„dLnmtatlOII~.. s~ ~ ~',.>s. ._. ~..
<br />Flow, MGD~~ Report
<br />•Settleable Solids, mUi Report
<br />. pH, s.u. 6.5-9.0
<br />Oi] and Grease, mg11 10
<br />Total Dissolved Solids, mg/1•' Report
<br />Total Phosphonus (as P), mg/1••• Report
<br />•If discharge is to land, TSS and settleable solids monitoring is waved. "A lies only to dramagcs within the Colorado River Basin
<br />•••Aoolies only to dminaees directly above Chatfield Reservoir. Chem Creek Reservott, INllon Reservov, or U9Per Bear Creek
<br />c. General Limitations -Active and Post-Minine Outfalls
<br />I
<br />1) There shall be no discharge of sanitary wastewaters from toilets or related facilities.
<br />2) Thete shall be no dixhazge of floating solids or visible foam in other than trace amounts.
<br />3) There shall be no land application of wastewater other than for dust control.'
<br />4) No chemicals shall be added to the dischazge unless the Division grants specific approval
<br />d. Bwden of Proof Requirements
<br />The pemtittee has the bwden of proof when requesting relief from total suspended solids (TSS), total 'iron, total manganese, and/or
<br />settleable solids limitations. Relief shall be granted only when necessary and shall not be granted when the permittee has control
<br />over the dischazge. The permittee should endeavor to meet the primary limitations whenever possible. The Division shall have final
<br />authority in determining whether relief is granted.
<br />1) For rainfall to waive TSS, totaltron, and total manganese limitations, it is necessary to demonstrate that discharge occurred
<br />within 48 bows after Ineasumble precipitation has stopped. To waive settleable solids limitations, it is necessary to prove that
<br />dischazge occurred within 48 bows after precipitation greater than the 10-yeaz, 24how event has stopped.
<br />2) For snowmelt, to waive TSS, total 'von, and total ttlanganese limitations, it is necessary to demonstrate that discharge occurted
<br />within 48 bows after pond inflow has stopped. To waive settleable solids limitations, it is necessary to prove that discharge
<br />occurred within 48 bows after pond inflow volume greater than the 10.yeaz, 24-how event has stopped.
<br />The Division shall determine the adequacy of proof. As part of this determination, the Division shall evaluate whether the pemtittee
<br />could have controlled the dischazge in such a manner that primary limitations could have been met. Al] manual dewatering ofponds
<br />that aze equipped with automatic dewatering systems must meet TSS, total iron, and total manganese limitations. Ifa pond has only
<br />manual dewatering capability, relief is available only to the extent required to regain necessary stability and capacity.
<br />See Part I.C. for Definitions
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