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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Control Division <br />Amendmem No. 5-Rationale. Page 4, Permit No. CO-0000132. <br />Such a review has been done for this new outfa[l. The only parameters for which the Division has determined <br />that a reasonable potential exists to impact the water quality standards are shown in Table VI-1 with the <br />applicable limitations. The basis for these limitatioru is discussed in sections V/.A.2 and VI.A.3. <br />Table VI-I -- Effluent Limitations <br />Discharge Limitations . . <br />Maximum Concentrations <br />Parameter 30-Day Avg. Daily Max. Rationale <br />Flow, MGD Report Report Facility Capacity <br />Total Suspended Solids, mg/P 35 70 Federal Effluent Guidelines <br />Total /ton, mg/Q 3.0 6.0 Federal Effluent Guidelines <br />Oi[ and Grease, mg/P N/A 10 State E,Bluent Regulations <br />pH, s.u. (Minimum-Maximum) N/A 6.5-9.0 Water Quality Standards <br />Total Dissolved Solids, mg/P Report Report Salinity Regulations <br />R7tole Effluent Toxicity, Chronic Lethality N/A No Statistical State Perneit Regulations <br />nitlPrenre <br />2. Discussion of Effluent Limitations <br />a) Rexu[arions for Effluent Limitations: The Regulations jot Effluent Limitations (5 CCR 1002-62), apply to the <br />conventional pollutams. For this facility the limitation for Oil and Grease is based on this regulation. <br />b) ~olicable Federal Elfluem Guidelines and Standards: The federal guidelines which apply to this type of <br />facility are found under 40 CFR 434, titled Coal Mining Point Source Effluent Guidelines. The limitatons <br />which apply to discharges of mine water are.• <br />Table Vl-2 -Federal Standards (40 CFR 434) <br />,. , <br />Parameter Lrmitations . . <br />30 Day Avg.:: Daily Max. <br />pH, s.u. (minimum -maximum) ---6.0 - 9.0--- <br />Total Suspended Solids, mg/P 35 <br />70 <br />Total Iron, mg/P <br />BAT* 3.5 7.0 <br />NSPS** ? 0 6 0 <br />* Best Available Technology -applies to those facilities already constructed <br />** New Source Performance Standards -applies to those facilities constructed after 5/4/84 <br />c) Water OualiN Standard (WOSI Based Efluent Limitations: The WQS for pH of 6.5 to 9.0 applies directly to <br />the discharge ro Elk Creek. The Division was only able to perform a preliminary reasonable potential <br />analysis for other water quality-based parameters using the data provided 6y the permittee since the data <br />were from locations other than the actual discharge point. This permit will require additional shoR-term <br />monitoring of new outfal[ OI S for those parameters for which a potential to exceed applicable WQS may <br />exist, based on the data submined. These parameters are total recoverable arsenic, total recoverable <br />cadmium, dissolved iron, and dissolved manganese. <br />