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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Control Division <br />Rationale -Page 5, Permit No. CO-0042161 <br />• B. Compliance With Terms and Conditions of Previous Permit <br />1. Effluent Limitations: The data shown in the preceding tables indicate that the Twenrymile Coal Company facility <br />has maintained compliance with the previous permit with the exception of the fo[[owing.• <br />Outfa11001: I pH, 2 rota! recoverable iron exceedences; <br />Ourfall 002: 5 BODs, 5 BODs % removal, 1 TSS, 1 fecal coliform exceedences. <br />The perminee explained each exceedence in writing and described actions taken to correct them. Because these <br />exceedences occurred over atwo-year period and the permittee responded quickly each rime, no formal <br />enforcement action has been taken. <br />2. Other Permit Requirements: The permittee has been in apparent compliance with al[ other terms and conditions <br />of the permit. <br />V. TERMS AND CONDITIONS OF PERMIT <br />A. Determination of Effluent Limitations <br /> <br /> <br />• I. Effluent Limitations: In developing suitable effluent limitations, the Division must review a[[ 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 based effluent limitations, federal guidelines and standards (40 CFR Subchapter <br />N) and the Regulations for Effluent Limitations (Regulation No. 62). Such a review has been done for this <br />facility. The only parameters for which limitations have been determined !o be necessary are shown in Tables <br />V-I and V-2 with the applicable limitations. The basis for these limitations is discussed in section V.A.2. <br />a) Ourfal! OOI <br />Table V-1 -Effluent Limitations for Outfal! 001 <br /> Discharge Limitations <br /> Parameter 30-Day Avg. ' Diw1y Mar. ~ r.::._ .:...Rationale'~?~: <br /> Flow, MGD Report Repott Mass Bal Calc <br /> Total Suspended Solids, mg/! 35 70 Federal E~Iuent Guidelines <br /> Oil and Grease, mg/! N/A 10 State E~'luem Regulations <br /> pH, s.u. (Minimum-Maximum) N/A 6.5-9.0 Water Quality Standards <br /> Total Dissolved Solids, mg/! Report Report Salinity Regulations <br /> Total Ammonia as N, mg/f <br /> through June 30, 2005 Report Report Interim Monitoring <br /> beginning July 1, 2005 Water Quality Standards <br /> January 2.4 Report - <br /> February 2.3 Report <br /> March 1.7 Report <br /> April /.8 Report <br /> ty~, 0.86 Report <br /> June 0.47 Report <br /> July-October 0.38 Report <br />• November 0.66 Report <br /> December 1.7 Report <br /> Total Recoverable Iron, mg/! 0.5 Report WQS/Antiiteg/Antibacksliding <br /> Whole E.Q7uem Tonicity, Chronic Lethality N/A No Statistical Stare Permit Regulations <br /> Difference <br />