2014-11-18_HYDROLOGY - M1977493

• Permit No: M1977493
• IBM Index Class Name: Hydrology
• Doc Date: 11/18/2014
• Doc Name: Robinson Seep Investigation- 2014 Results.
• From: Climax Molybdenum
• To: DRMS
• Permit Index Doc Type: Hydrology Report
• Email Name: ECS
• Media Type: D
• Archive: No

Status Report, Robinson Seep Investigation Climax Molybdenum Company
TABLE OF CONTENTS
1.0
INTRODUCTION ............................................................................... ..............................1
1.1 Objective ................................................................................ ..............................1
1.2 Monitoring Program ............................................................... ..............................1
1.3 Previous Water Quality Investigations .................................... ..............................2
2.0
2014 FIELD SUMMARY .................................................................... ..............................3
3.0
GROUNDWATER QUALITY ............................................................. ..............................4
4.0
HYDRAULIC CONDUCTIVITY ESTIMATES, MONITORING WELL EVMW -1S
.............7
6.0
SHORT AND LONG TERM TRENDS ............................................... ..............................8
5.1 Sulfate and Total Dissolved Solids ......................................... ..............................8
5.2 Iron ........................................................................................ ..............................8
5.3 Manganese ............................................................................ ..............................9
6.0
EVALUATION OF THE EFFECTIVENESS OF MONTHLY MONITORING ...................10
7.0
CONCLUSIONS AND RECOMMENDATIONS ................................ .............................11
8.0
REFERENCES ................................................................................. .............................12
LIST OF TABLES
Table 1: Field Parameters & Select Analytical Data (August 2014 Data) ...... ..............................5
Table 2: Metal Concentrations (August 2014 Data) ...................................... ..............................6
LIST OF FIGURES
Figure 1: Electrical Conductivity Field Parameters
Figure 2: Dissolved Iron Concentrations - August 2014 Data
Figure 3: Iron Stability Diagram for Drilled Monitoring Locations (August 2014 Data)
Figure 4a: Piper Diagram for Select Sampling Locations (August 2014 Data)
Figure 4b: Piper Diagram for Select Sampling Locations showing Total Dissolved Solids
Concentrations (August 2014 Data). Increasing TDS circle radius indicates
increasing TDS
Figure 5: Short Term Trends of Various Constituents at Select Locations
Figure 6: Long Term Trends of Various Constituents at Select Locations
Figure 7: Iron Stability Diagram of Monitoring Data (September 2014 Data)
Tetra Tech November 2014 i