2018-03-05_REVISION - M1977493

• Permit No: M1977493
• IBM Index Class Name: REVISION
• Doc Date: 3/5/2018
• Doc Name: Request for Technical Revision
• From: Climax Molybdenum Company
• To: DRMS
• Type & Sequence: TR27
• Email Name: ECS
• Email Name: WHE
• Media Type: D
• Archive: No

Water Quality Monitoring Plan Climax Molybdenum Company
Version R4 Permit No M-1977-493
TABLE OF CONTENTS
1.0 PURPOSE........................................................................................................................................1
2.0 SITE DESCRIPTION........................................................................................................................2
2.1 General Setting...................................................................................................................2
2.2 Site Hydrogeology...............................................................................................................2
2.3 Monitoring Network.............................................................................................................3
3.0 CLIMAX DRAINAGE BASINS AND MONITORING SITES............................................................4
3.1 Arkansas River Watershed.................................................................................................4
3.1.1 Existing and Potential Future Uses of Groundwater..............................................4
3.1.2 Location and Description of Classified Stream Segments.....................................4
3.1.3 Potential Contaminant Sources and EPFs............................................................4
3.1.4 Hydrogeology......................................................................................................... 5
3.1.5 Groundwater Monitoring Sites...............................................................................5
3.1.6 Surface Water Monitoring Sites............................................................................. 6
3.2 Eagle River Watershed.......................................................................................................6
3.2.1 Existing and Potential Future Uses of Groundwater.............................................. 6
3.2.2 Location and Description of Classified Stream Segments..................................... 6
3.2.3 Potential Contamination Sources and EPFs.......................................................... 6
3.2.4 Hydrogeology......................................................................................................... 7
3.2.5 Groundwater Monitoring Sites............................................................................... 7
3.2.6 Surface Water Monitoring Sites............................................................................. 8
3.3 Tenmile Creek Watershed..................................................................................................9
3.3.1 Existing and Potential Future Uses of Groundwater.............................................. 9
3.3.2 Location and Description of Classified Stream Segments..................................... 9
3.3.3 Potential Contamination Sources and EPFs.......................................................... 9
3.3.4 Hydrogeology............................................................... ......................................... 9
3.3.5 Groundwater Monitoring Sites........................................................... ................. 10
3.3.6 Surface Water Monitoring Sites........................................................................... 11
4.0 MONITORING PARAMETERS AND MONITORING SCHEDULE...............................................12
4.1 Monitoring Parameters...................................................................................................... 12
4.1.1 Groundwater Monitoring...................................................................................... 12
4.1.2 Internal Surface Water Monitoring Sites.............................................................. 16
4.1.3 River and Eagle Park Reservoir Surface Water Monitoring................................ 18
4.1.4 Surface Water Monitoring Baseline Data Evaluation........................................... 19
4.2 Monitoring Schedule.........................................................................................................20
5.0 NPLS, DATA ANALYSIS AND REPORTING...............................................................................21
5.1 Numeric Protection Levels (NPLs)for POC Wells............................................................21
5.1.1 Arkansas River Watershed..................................................................................22
5.1.2 Eagle River Watershed........................................................................................24
5.1.3 Tenmile Creek Watershed...................................................................................25
5.2 Data Analysis....................................................................................................................26
5.2.1 POC Groundwater Monitoring Sites NPL Evaluation...........................................26
5.2.2 Additional Data Evaluation...................................................................................27
EPP—Appendix C March 2018 i