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COLORADO DEPARTi14ENT OF PUBLIC HEALTH AND E~WTRONMENT, Water Qtmlity Control Division <br />Rationale -Page 10, Permit Na. CO-0045161 <br />Thus, the TSS exceedences shown in the tables are considered as permit violations, as do the pH ezceedences. <br />The Division does not contemplate formal enforcement action on these vtalazions. <br />As mentioned several times in this rationale, the permitree has reassessed their sedimentation pond system and <br />is expected to shortly receive approv¢1 from the CO Division of Minerals and Geology to convert all to the <br />automatic dewatering mode. When the ponds are converted, manual de~vctering should occur only on a very <br />infrequent basis, at a rate controlled by the permiaee and not forced by .7ew incoming precipitation flow. Ibis <br />will simplify future evaluation of requests for the exemption as it will place this facility on the same 'plant' as <br />other coal facilities. <br />2. Other Permit Requirements: The perminee has been in apparent compliance with all other terms and conditions <br />of the permit. <br />VI. TERMS AND CONDITIONS OF PERMIT <br />A. Daterminatian of Effluent Limitations <br />Efluent Limirarions: !n developing suitable effluent limitations, the Division must review all applicable <br />standards and regulations and apply those which are more stringent. This review includes, but is not limited <br />to: the water quality standard bared effluent limitations, federal guidelines and standards (40 CFR Subchapter <br />N) and Regulations for Ejfluem Limitations, section 62.4. Such a review has been done for this facility. The <br />following [imitations will apply. the basis for these limitations is discussed in Secliart VI.A.2. All discharges <br />shall be achieved in accordance with applicable state laws. ZAis permit does not give any property rights nor <br />override any law regulated by another state agency. - <br />Table VI-l - Efflaent Limitations for Outfalls OOIa, 002a, 003a, 004a, OOSa, 006a, 007a, 008a, 009a, OIOa <br />c e ns <br />:. .. .. , <br />aT8 <br />itifaiimum'.Concentrations::. " <br />~.~ <br />Parameter ` 30-Dav Ave.::. .Doily Mat:: ; ` - -R~onale: <br />Flaw, MGD Report Report Desig.a Capadty <br />Total Suspended Solids, 35 70 Federal Effluent Guidelines <br />mg/P" <br />Total Iran, mg/t` 3.5 7.0 Federal Efflueru Guidelines <br />Settleable Solids, mP/P" Report 0.5 Federal EJjiuent Guidelines <br />Oil and Grease, mg/P Report 10 State Effluent Regulations <br />pH, s. u. (minimum- N/A 6.5-9.0 Water Quality Standards <br />maximum) <br />Total Dissolved Solids, mg/P Report Report CO River Salinity Standards <br />Total Suspended Solids and Total Iron limitations are Primary Limitations, and Settleable Solids limitations are <br />A[terrrate Limitations. Exemption from these limitations due to storm eve.rsts is subject to burden of proof <br />requirements -see sectors VI.A.2.b). <br />- Effluent Limitations for Outfal(s 002b, 004b, 007b, OOSb, 009b, OIOb <br />-- <br />Discharge Limitations; t.~. <br /> Maximum Conceitttvlions' . ' <br />Parameter. 30-Day.4v~- DaiIy.Max.. Rationale ~( <br />Flow, MGD Report Report Flow Assessment <br />Total Suspended Sofids, mg/P 35 70 Federal .Eftiuent Guidelines <br />Total Recoverable Iron, mg/P 1.0 Report Water Qsclity Standards <br />