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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT; Water Quality Control Division <br />Rationale -Page 6, Permit No. CO-0027146 <br />Total Iron, mg/1 <br />30-day avg <br />daily max <br />Oil & Grease, mg/1 <br />pH, s.u. <br />Total Dissolved Solids, mg/P <br />30-day avg <br />dally max <br />Whole Effluent Toxicity, Acute <br />Ceriodanhnia dubia <br />Pimenhales nromelas <br />0.9/0.13/4.1 3.5 1 <br />3.28/0.16/19.1 7.0 1 <br />-/7.3/9.0 6.5-9.0 0 <br />!516/1067/1834 none - <br />1856/1078/2070 wne - <br />>100%/>100%/>100% >100% 0 <br />> 100%/> lOID%/> /00% > 100% 0 <br />2. State Samolinn: There are w recent state sampling results available jot this facility. <br />B. Compliance With Terms and Conditions of Previous Permit <br />I. Effluent Limitations: T&e data shown in the preceding tables indicate apparem violations of the permits. There were <br />jour instances of exceedences of both the 30-day average and daily maximum limitations for TSS and one esceedence <br />of both the 30day average and daily maximum limitations (during the second quarter of 1996) for total iron. The <br />first, during the second quarter of 1995, was caused by failure of a sump pump in the portal causing overflow of water <br />that traveled down a road and picked up additional solids. The second, during the second quarter of 1996, resulted <br />from an operator lowering a pump too law in a sump where it picked up settled solids. The third, during the fourth <br />quaver of 1996, was caused when an operator washed approximately 500 pounds of coal fines off a conveyor belt to <br />comply with OSHA requirements. These fines are normally removed dry and kept from the water systems. The fourth, <br />during the first quaver of 1997, was the result of unintentional overflow of the main sump. Each problem was <br />rectified as soon as it was discovered. No enforcemem actions were issued by the Division for any ojthese <br />exceedences. <br />2. Other Permit Reggiremems: The perminee has been in apparem compliance with all other terms and conditions of the <br />permit. <br />V!. TERMS AND CONDITIONS OF PERMIT <br />A. Determination of Effluent Limitations <br />I. Ej(Luent Limitations: In developing suitable effluem limitations, the Division must review all applicable standards and <br />regulations and apply those which are more stringem. Ibis review includes, but is vat limited to: the water quality <br />standard based e~lrtent limitations, federal guidelines and standards (40 CFR Subchapter M and State Effluent <br />Regulations (S CCR 1002-62). Such a review has been done jar this facility. The following limitations will apply. <br />the basis for these limitations is discussed in Sections VI.A.1 and V/.A.3. <br />aent Limitations inr Outfallc 001_ /102. 0/W and OI S <br />c ~ <br />.. . <br />' h Limttatia <br />Drs urge <br />,. <br />M <br />axunum.Cortcenunuons ...:. <br />,.. <br />Parameter :::. .::.30-Day:Avg..:.:. DaSy Maz::. `:::: '. :Rationale ::. :. :. . <br />Flow, MGD <br />7TS, mg/1 <br />Totallron, mg/1 <br />Oil and Grease, mg/Q <br />Report Report <br />35 70 <br />3.5 7.0 <br />Report 10 <br />Design Capacity <br />Federal E,(jiuent Guidelines <br />Federal Efflttent Guidelines <br />State Effluent Regulations <br />