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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />Rationale - Page 6. Permit No. CO-0036595. <br />r <br />VI. TERMS AND CONDITIONS OF PERMIT <br />a/ 30 Day Average <br />b/ Average of daily values for 30 consecutive days/Daily maximum <br />c/ Minimum-Maximum <br />a/ Daily Maximum <br />e/ Effective during periods of precipitation less than or equal to the <br />10-year, 24-hour precipitation event for this facility, subject to burden <br />of proof requirements as described in permit. <br />Table VI-2 -- Effluent Limits - 004, 005 <br />Parameter <br />Limit <br />Rationale <br />Flow, MGD Report a/ NA <br />TSS, mg/1 35/70 ~b/ DPJ of IICT* <br />Total Iron, mg/1 3.5/7.0 b/ Dest Available Technology <br />pH, s.u. 6.5-9.0 c/ Water quality Standards <br />Oil and Grease, mg/1 10 d/ State Effluent Regulations <br />Whole Effluent Toxicity, Acute Report See Discussion <br />*Best Professional Judgment of Best Conventional Pollutant Control Technology <br />a/ 30 Day Average <br />b/ Average of dally values for 30 consecutive days/Daily maximum <br />c/ Minimum-Maximum <br />3/ Daily Plaximum <br />1. Water Quality Standard Based Effluent Limitations: <br />a) pH: For pH, the limits are set directly from stream standards. <br />2. Applicable Federal Effluent Guidelines and Standards: The federal <br />guidelines which apply to this type of facility are found under 40 <br />CFR 434, the Coal Mining Point Source Category. The limitations <br />Which apply are: <br />Table VI-3 -- Federal Standards <br />Parameter <br />Avg. of Daily Values <br />for 30 Consecutive Days Daily Maximum <br />T. Suspended Solids, mg/1 (BPJ of BCT) 35 <br />Total Iron, mg/1 (BAT) 3.5 <br />Settleable Solids, ml/1 (Precip. Even[s)* NA <br />70 <br />7.0 <br />0.5 <br /> <br />*Applies to outfalls 001 and 002. <br />