HYDRO31599

• Permit No: M1999002
• IBM Index Class Name: Hydrology
• Doc Date: 2/9/2000
• Doc Name: FINAL AREA PERMIT VIC ISSUED TO AM SODA P 83-164
• Media Type: D
• Archive: No

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December 23, 1999
SUBSIDENCE MONITORING PLAN
Submitted by
AMERICAN SODA, L.L.P
for
YANKEE GULCH SODIUM MINERALS PROJECT
Page i
Table of Contents
Paee
1.0 INTRODUCTION ...................................................... 1
2.0 SURFACE SUBSIDENCE MONITORING .................................. 1
2.1 Monument Locations for the Initial Mining Area ......................... 1
2.2 Monument Locations for Future Mining Areas .......................... . 2
2.3 Surface Monitoring Frequency and Duration ............................. 2
3.0 SUBSURFACE MONITORING .......................................... 2
3.l Time Domain Reflectometry ......................................... 2
3.2 Borehole Geophysics ...............................................3
3.3 Solution Cavity Characterization ..................................... . 3
3.4 Subsurface Monitoring Frequency and Duration .......................... 3
4.0 REPORTING ..........................................................4
5.0 MITIGATION .........................................................4
6.0 QUALITY ASSURANCE AND QUALITY CONTROL ....................... 5
7.0 REFERENCES ......................................................... 5
List of Figures
Pace
Figure 1. Subsidence Monitoring Plan for Yan}:ee Gulch Lease ..................... 6
Figure 2. Schematic of Typical Well Completion with TDR Installation and
Monitoring and Instrumentation String ................................. 7
Agapito Associates, Inc.
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