1992-08-07_REVISION - M1988112 ‎(2)‎

• Permit No: M1988112
• IBM Index Class Name: Revision
• Doc Date: 8/7/1992
• Doc Name: MODIFICATIONS TO EXISTING GROUND WATER MONITORING SYSTEM SAN LUIS GOLD PROJECT COSTILLA COUNTY COLO
• Type & Sequence: TR8
• Media Type: D
• Archive: No

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TABLE OF CONTENTS
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Introduction 1
' Field Investigations 2
' Installation of Monitoring Wells
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' Aquifer Testing 4
Water Quality Sampling 5
' Hydrogeologic Assessment from Monitoring Well Data b
Conclusions and Recommendations 8
' Credits 10
References 11

Figure 1 - Monitoring Well Location Map (Downgradient of Tailings Facility)
' Figure 2 - Monitoring Well M-12 Geologic Log and Construction Details
Figure 3 - Monitoring Well M-13 Geologic Log and Construction Details
Figure 4- Water Level Drawdown Plot, Well M-9
Figure 5- Water Level Drawdown Plot, Well M-12
' Figure 6- Water Level Drawdown Plot, Well M-13
Figure 7- Potentiometric Surface Map Below the Tailings Facility
' Figure 8- Structural Contour Map of the Base of the M-9 Production Interval
Figure 9- Geologic Cross-Section A-A'
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Table 1- Well Completion Details
t Table 2- Summary of Aquifer Hydraulic Characteristics
Table 3- Monitoring Well Water Level Elevation Data
Table 4- Summary of Cyanide Analyses from Monitoring Wells Below Tailings Facility
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