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COLORADO DEPARTMENT OF f~AL77i, Water Quality Control Division <br />Rationale, Amendment No. 4. Page 3. Permit No. CO-0042161 <br />Table /V-1 - E,(Jluem Llmltatlons jot Ott{faU 002 <br />Parameter Limitation Rationale <br />Flow, MCD 0.015 a/ Design Capacity <br />BODS, mg/t 30/45 b/ Stare Efjluem Limitations <br />TSS, tag/t 75//10 6/ State Efjluem Regulations <br />Fecal Caliform, No. /100 mt 6000/12000 c/ State FC Policy <br />a/ 30-day average <br />b/ 30day average/7~ay average <br />c/ 30-day geometric mean/7-day geometric mean <br />d/ Mininwm-Maximum <br />!n addition to the above numeric limitations, the discharge is subject to percem removal requiremenu jot GODS. <br />Minimum removal shall be 85`Ri as determined through calculations using influent and effluent BODS <br />concentrations (see Part I.A.2.d) of the permit). <br />C. Antidegradalion: Because of this system's configuration, it is not upected that this discharge wi(/ contribute an <br />increased loading oj10`Yo or greater. There it no direct discharge to state waters from this source. The discharge <br />goes to a spoils spring where it is mixed with runoff and groundwater. The spring water seep is pumped ro the <br />rune where it is used far dust suppression. The excess mine water is pumped Jo two sealing ponds. Discharge <br />from the final pond goes to Fish C}eek Because of this circuitous flow scheme, it is very unlikely that any <br />discharge from this new source will impact Fish Creek <br />D. Monitoring Requirements: <br />1) Ourfall 002: Table IV-2 species the effluent monitoring frequencies and sample type jot autfall 002. <br />Table /V 2 -- Effluent Monitoring Requirements jot Owjatl 002 <br />Effluent Parameter Measurernetu Frequency Sample Type <br />Flow, MGD Weekly /nstantaneous <br />or Cominuous .. <br />BODS, mg/t Monthly Grab <br />TSS, mg/t Monthly Grab <br />Fecal Colijorm, No./IOOmI Monthly Grab <br />Compliance with the organic capacity requirement shall be determined 6y multiplying the influem BODS <br />concentration (in mg/t) X the 30day average influem flow (in MGD) X 8.34. In order to determine this, the <br />pertnirtee will be required to collect and analyze influem BODS samples on a monthly basis, regardless of <br />whether a discharge occurs. /nfluem flow monitoring will also be required. The flow value used in the above <br />calculation shall be the mean of all weekly flow measurements collected during the applicable calendar month. <br />