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I COLORADO DEPARTMENT OFPCBLIC HEALTH AND ENVIRONMENT, Water Quality Control Division
<br />Rationale- Pnge 4, Permit No. CO-0038776
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<br />2. Discussion of Effluent Limitations
<br />a. BOD TSS total residual chlorine oil and tease and H: The Renzlations for E{lluent Limitations (Regulation No. 61)
<br />in~e a went imitations t at ayy y to a isc arges o wastewater to tote waters. T ese regu atzons are applicable to
<br />the discharge from the West Elk Mine WWTF.
<br />The BOD and TSS concentrations
<br />are therefore applied pt internal
<br />TSS based on the Re lotions or i
<br />previous permit limits an t us are
<br />rent Limitations are the most stringent effluent limits and
<br />'e ure. a ppercent removal percentages for BODS and
<br />at internal Outfa11007. These limits are the same as the
<br />Discharges from internal Outfall 007 enters pond MB-2R from which Outfall 004 discharges. Since additional treatment
<br />for total residual chlorine is afforded in pond MB-2R, the total residual chlorine limitation based on theRe folio or
<br />Effluent Limitations which is mare stringent than the limit based on water uality, shall not be imposed at inferno u a
<br />ut instea at Outfall 004. Although no total residual chlorine e~fluenf data are available at Outfall 004, the
<br />discharge should be a61e to meet this limit and therefore it is imposed effective immediately.
<br />Far the same reasons discussed above, pH and oil &gr ease limitations are not being imposed at Outfall 007 and instead
<br />apply at the point offdischarge to state waters, Outfa11004. These limitations are the same as in the previous permit and
<br />are effective tmmefi:ately.
<br />b. Fecal Coli orm. 77te State's Procedure for Selection of Fecal coliform Limitations Permit Conditions establishes limits for
<br />eca co t orm: 6,000 organisms per m 3~y geometric mean an organisms per ml (7-day geometnc
<br />mean). ese limits are more stringent than the Zimtt based on water qquality Therefore, the limits at Outfah 007 will be
<br />set at the levels s eeified in the Procedure for Selection o/'Fecal coliform Limttanons Permit. Conditions. Because no
<br />other sources of fecal coliform are expected zn Pond MB-2X and ecal coliform treatment is not conducted in Pond MB-2R,
<br />no fecal coliform limits or monitoring will be required at Ou~ll 004 and instead fecal coliform limits are imposed at
<br />Outfal1007. .
<br />The fecal coliform limitations determined for Outfa11007 are equal to the previous permit limits and thus are imposed as
<br />permit limits effective immediately.
<br />c. ~ -This parameter is applicable to a1112 Outfalls from this facility that discharge directly to State waters and is limited
<br />y water quality standards as the water qualify standards o 6.5- 0 s.u. range are more stringent than those specified
<br />under the Re¢ttlations for Effluent Limitations. These limas are the same as those previously imposed and are effective
<br />tmmediate~
<br />d. Applicable Federal Effluent Guidelines and Standards: The federal guidelines that apply to this type offacility are found
<br />un e~71-~3d tttl~Coa1~14ntnz omt ource ateeorv. The limitations that apply, effective tmmeddtately, are:
<br />Table VI-6 -- Federal Standards (40 CFR 434)
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<br />pH, s. u. (Minimum -maximum) 6.0 - 9.0
<br />Total Suspended Solids, mg/1 * 35 70
<br />Totallron, mg/1
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<br />NSPS***
<br />3.5
<br />3.0
<br />7.0
<br />6.0
<br />Settleable Solids, ml/1 * NA 0.5
<br />vnese parameters are suo/em to euernate ~Lmuanon curaen o~ rroo~ rcequvements, wee nett secnon
<br />*'Bert Available Technology -applies to thoseponds already corutructed
<br />*'*New Source Pe; jormance Standards - applies to facilities counucfed of er 5/4/84
<br />Alternate Limitation Burden of ProofReauirements: In conformance with 40 CFR 434.63, the permittee has the burden of
<br />proo w ten see ang re to om tots s~ uspen3e~i skids (TSS), total iron, and/or settleable solids (sS) limitations. Discharges
<br />from Outfalls 011, 012, I3, and 017 are not eligible for this relief. Outfalls 004 and 016 may be eligible for relief from
<br />TSS, total iron, and SS, however, the maf'ority of the loading tom an discharge has to consist ofstorm runofffor the relief
<br />to be available. The permtaee will need to show that excee~nce of The applicable limitations was caused b pprecippitation
<br />and not mine water, through a coinpp~rison o(/'the loading from each source. The remaining permitted Outfa[[s (0(I5, 008,
<br />009, 014, 015 and 018) are eli ible for reliejfrom TSS, total iron and SS at all times since only surface runoff water
<br />discharges are authorized from t~ese outfalls.
<br />Last Revised: 4/19/2004
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