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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division Rationale -Page 25, Permit No. CO-0043648 Table VI-7 Monitoring jor• Point 002A -Pregnant Solution Storage Area Leak Colletxion and Recovery System (PSSA-LCRS); and Poiru 003A -Ore Storage Area Leak Detection System (OSA-LDS) E,(/Iuent Parameter Measunment Frequency Smitple Type . cont'd from previous page Ammonia, Total, mg/! (!bs/dayJ Cyanide, Weak Acid Dissociable, mg11 Aluminum, Potentially Dissolved, ug/f Cadmium, Potentially Dissolved, ug/l Copper, Potentially Dissolved, ug/l Manganese, Total Recoverable, ug/1 Mercury, Total, ug/l Silver, Potentially Dissolved, ug/! Nat Reauirtd Until Cyanide Removal Process /s Beeun Once/2 Weeks Grab Once/Z Weeks Composite Once/2 Weeks Composite Once/2 Weeks Composite Once/2 Weeks Composite Once/2 Weeks Composite Once/2 Weeks Composite Zinc, Potentially Dissolved, ug/l Once/2 Weeks Composite Leakaee Action Codes The application for Amendment 116 of the Divrsion of MineraLr and Geology (DMGJ mining permit defines certain criteria that will be used to determine what operational changes must be made and what notiftcation procedures must be followed if leakage from the leach pad is detected. Which action to follow is dependent upon how much leakage is found. Using the criteria and corresponding responses specified in the DMG permit application, the permiuee shall determine which of the following actions is appropriate, shall perform the indicated action, and shall use the action codes that are listed to calculate values that must then be reponed on the monthly Discharge Monitoring Reports (DMR,cJ. I Normal operation continuing -collected leachate must 6e pumped back to the solution circulation system 2 The leakage monitoring frequenry must be increased to at least twice the frequency listed in Table V/-7, and any observable dmnage to the liner must be repaired. 3 Water management must be improved in order to reduce the leakage rate. Special not cation must be provided to the Water Qualiry Control Division and the Division ojMinerais nrul Geology indicating what the leakage rate is and x~hnt measures have been taken ro reduce it. The permiaee shall provide verbal not cation the WQCD within 24 hrs, and written notification within 5 dm~s. 4 Additional measures mast be implemented in order to reduce leakage, which may include the inspection and repair ojthe liner or the reduction of head over the liner. Special notification must 6e provided to the Water Quality Control Division and the Division ojMinerair and Geology indicating what the leakage rate is and what measures have been taken to reduce it. The permiaee shall provide verbal notification to the WQCD within 24 hrs, and wrinen notification within 5 days. In addition to [he nottfication provisions listed above, when cyanide is detected for points 002A or 003A, the perminee shall provide verbal notification to the WQCD within 24 hrs, and written notification within S days.