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;OLORADO DEPARTMENT OFPtIBLICHEALTHAND ENYIRONMENZ; Wa[er Qaaliry Control Division
<br />iationnle-Page 4, Permit No. CO-0038776
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<br />Table VI-5 -Effluent Limits For Outfa11007
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<br />2. Discussion ofEf/luent Limitations
<br />a. B~. TSS total residual chlot
<br />the West Elk
<br />The $ODs and TSS concentratioi
<br />are therefore applied.atinternal
<br />TSS based oit the Re latiorrs of
<br />previous permit limits an t us m
<br />The Regulations for Effluent Limitations (Regulation No. 62)
<br />ttewater to fate waters. ese regu~ons are applicable to
<br />the Re lotions or E ueni Limitations are the most stringent effluent limits and
<br />00 as per proce use. a p~ercent removal percentages for BODS and
<br />t Limitations a so apply at internal Outfall 007. These limits are t e same as the
<br />Discharges from internal Outfall 007 enters pond MB-2R from which Outfall 004 discharges. Since additional treatment
<br />jot total restdual chlorine is afforded in pond MB-2R the total residual chlorine limitation based on the Re lotions or
<br />E uent Limitations which is more stringent than the fimit based on water uality, shall not be imposed at interna t a
<br />ut instea at Outfall 004. Although no total residual chlorine e~fluent data are available at Outfall 004, the
<br />discharge should be able fo meet this limit and therefore it is imposed effectzve immediately.
<br />For the same reasons discussed above, pH and oil & tease limitations are not being imposed at Ourfall 007 and instead
<br />apply at the point of discharge to state waters, Outfa/l 004. These limitations are the same as to the previous permit and
<br />are effective /mme lately.
<br />b. Fecal Coli orm: The State's Procedure or Selection o Fecal Coli orm Limitations Permit Conditions establishes limits far
<br />eca co t ornz.• 6,000 organisms per m - ay ~eometrie mean an organisms per ml (7-day geometric
<br />mean). ese limits are more stringent than the limzt based on water gguality~ Therefore, the limits at Outfall 007 will be
<br />set at the levels s ecfed in the Procedure for Selection ojFecal Col form Limttatans Permit. Conditions. Because no
<br />other sources ojjecal coliform are expected in Pond MB-211 and eca! 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
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<br />The fecal coliform limitations determined for Outfall 007 are equal to the previous permit limits and thus are imposed as
<br />permtt limits effective immediately.
<br />c. off -This parameter i5 applicable to all 12 Outfalls from this acilittyy that discharge directly to State waters and rs limited
<br />water quality standards as the water quality standards o~6.5-9.0 s. u. range are more stringent than those specfed
<br />under the Regulators for Effluent Limitations. These limits are the same as those previously imposed and are effective
<br />immediate y.
<br />d. Aaplicable Federal Effluent Guidelines and Standards: The federal guidelines chat apply to this type of facility are found
<br />un~er~ll-C`FR73d htTe oa ininQ ozn't~ourcet"ate2orv. The limitations that apply, effective zmmeiilbktely, 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/!
<br />BAT * * 3.5 7.0
<br />NSPS* ** 3.0 6.0
<br />Settleable Solids, mUl * NA 0.5
<br />`]nese parameters are subJect to alternate umuanon buraen of Proof Requirements, See next section
<br />* *Best Available Technology -applies :a chose ponds dready constructed
<br />*'*New Source Pe jormance Standards - appltes to facilities constructed after 5/4/84
<br />Alternate Limitation Burden o Proo Re uirements: In conformance with 40 CFR 434.63, the ermittee has the burden of
<br />proo w en see deg re to om tota suspen a so Ids (TSS), total iron, and/or.settieablesofids (pSS)) limitations. Discharges
<br />from Outfalls 011, 012, 13, and 017 are not eligible for this relief. Outfalls 004 and 016 may be eligible for relief from
<br />TSS, total:ron, and SS; however, the majority of the loading from an discharge has to consist ofstorm runofffor the relief
<br />to 6e available. The permittee will need to show that excee ence of the applicable limitations was caused b pprecipitation
<br />and not mine water, through a compparison ojjYhe loading from each source. The remaining permitted Ou~lls (005, 008,
<br />D09, 014, 015 and 018) are ellgtble for reliejfrom TSS, total iron and SS at all times state only surface runoff water
<br />discharges are authorized from these outfalls.
<br />Last Revised: 4/19!2004
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