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Page 1 <br /> <br />COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />Rationale -Page 11 Permit No. CO-0045675 <br />hydraulic gradient reversal). <br />Other alternate long-term management activities under evaluation but not included or authorized (or discharge in <br />this permit would be based on the results obtained from conducling a pilot-scale test ofpassive biological <br />treatment to reduce sulfate, produce alkalinity, and precipitate metal sulffde compounds. Additionally, manganese <br />maybe treated using a passive aerobic treatment system. <br />VI. TERMS AND CONDITIONS OF PERMIT <br />A. Determinationo/EffluentLlmitadons <br />1. Effluent Limitations: In developing suRable effluent limitations, the Division must review all applicable standards <br />and regulations and apply that which is more stringent. Such a review has been done (or this facility. The <br />review includes, but is not limited to, the water quality standard based effluent limitations, federal guidelines <br />and standards (40 CFR Subchapter N) and the Regulatons for Effluent Limitations (Regulation No. 62). As <br />shown in Tables VI-1a, VI-16 and VI-1c on the neM three pages, the following limitations will apply and are <br />discussed in Sections VI.A.2, VI.A.3 and VI.A.4. <br />Table VI-1a -Effluent Limitations, Discharge Point 001a <br />Parameter Limitations Rationale <br />Flow, MGD (gpm) 0.576 (400) g/ Design/Flow Assessment <br />Total Suspended Solids, mg/1 30/45 E/ State Effluent Regula0ons <br />Oil and Grease, mg/I 10.0 d/(/ State Effluent Regulations <br />pH,s.u. 6.5-9.0 SJ Water Quality Standards <br />Chronic WET Testing Report Statistical g/ State Discharge Permit Regulations <br />Potentially Dissolved Aluminum, mg/I <br />Total Arsenic, mgll <br />Potentially Dissolved Cadmium, mg/I <br />Potentially Dissolved Copper, mg/1 <br />Dissolved Iron, mg/1 <br />Total Recove2ble Iron, mg/1 <br />Potentially Dissolved Lead, mg/1 <br />Dissolved Manganese, myl <br />Total Recoverable Manganese, myl <br />Total Radium 226+228, pCv1 <br />Total Selenium, mgrl <br />Potentially Dissolved Silver, mcyl <br />Total Natural Uranium, mg/1 <br />Potentially Dissolved Zinc, mg/1 <br />Total Fluoride, mgA <br />Total Suttate, mryl <br />gr30.Dey Average <br />Difference <br />0.087/1.8 ¢/ Antidegredation-Based/WQS-Based <br />Report / 0.020 b/ Antdegradation-Basetl Limit <br />0.00040/0.015 b/ Antidegradafion-Based/WQS-Based <br />0.0040/0.028 b/ AnOdegredatlon-Based/WQS-Based <br />0.30/Report ¢/ Antidegradafion-Based limit <br />1.0 /Report b/ Antidegradafion-Basetl Limit <br />0.0012 / 0.11 ty Antidegradafion-Based /WQS-Based <br />0.050 /Report p/ Antdegradation-Based Limit <br />1.1 /Report tN Antidegradafion-Based Limit <br />Report/5.0 ~/ Antidegradafion-8asetlLimit <br />Report/0.0040 ~/ Antidegradafion-BasetlLimit <br />0.000030/0.0022 p/ Antidegradafion-Based/WQS-Based <br />0.92/3.6 ~/ Antldegredation-Based/WQS-Based <br />0.037/0.19 fy Antidegradafion-Based/WQS-Based <br />Repoli/2.1 q/ Antidegradation-BasedLimit <br />205 /Report tar Antidegredation-Based Limit <br />SJMinimum-Maximum g/30.Day Average/?-Day Average <br />