REP50650

• Permit No: C1981018
• IBM Index Class Name: Report
• Doc Date: 3/15/1999
• Doc Name: 1998 AHR
• Annual Report Year: 1998
• Permit Index Doc Type: HYDROLOGY REPORT
• Media Type: D
• Archive: No

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TABLE OF CONTENTS

1.0 INTRODUCTION ........................................................................................................ ............ 1
2.0 SUMMARY OF HYDROLOGY MONITORING DATA ................................................ ............ 2
2.1 Description of the Deserado Mine Hydrologic Monitoring Program ............ ............ 2
' 2.1.1 Surface Water Monitoring Program ................................................ ............ 2
2.1.2 Ground Water Monitoring Program ................................................ ............ 3
2.2 Summary and Analysis of Deserado Mine Hydrology Data ............................. ............ 5
' 2.2.1 Ground Water Monitoring Data ......................................................... ............ 5
2.2.1.1 Alluvial Water Level Data .................................................. ............ 5
t 2.2.1.2 Alluvial Water Quality Data ................................................ ............ 6
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2.2.1.3 Bedrock Water Level Data ................................................. .......... 1
2.2.1.4 Bedrock Water Quality ....................................................... ........... 11
' 2.2.1.5 Mine Water Balance .......................................................... ........... 11
2.2.1.6 NPDES Discharges and Whole Effluent Testing ............... ........... 14
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3 2.2.1.7 Whole Effluent Toxicity (WEIR Testing ..............................
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16
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' 3.0 HYDROLOGY AND MINE DEVELOPMENT .............................................................. ........... 18
3.1 Mining Related Hydrologic Impacts ............................................................ ........... 18
' 3.2 Comparison of Projected Impacts With Observed Impacts ........................ ........... 18
3.3 Significance of Impacts to Use of Water ..................................................... ........... 19
3.4 Effectiveness of Mitigation Measures ......................................................... ........... 20
' 3.5 Changes Necessary to Minimize Impacts .................................................. ........... 20

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MAA 1 5 1999 ~

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