PERMFILE124965

• Permit No: M1999002
• IBM Index Class Name: Permit File
• Doc Date: 4/20/1999
• Doc Name: TR1 TO APPLICATION SUBSIDENCE MONITORING PLAN
• From: AMERICAN SODA
• To: DMG
• Media Type: D
• Archive: No

April I5, 1999 •
• Page i
SUBSIDENCC MONITORING PLAN
Submitted by
AMERICAN SODA, L.L.P
for
YANKEE GULCH SODIUM MINERALS PROJECT
Table of Contents
Paee
1.0 INTRODUCTION ...................................................... 1
2.0 SURFACE SUBSIDENCE MONITORING ................................. 1
Z.1 Monument Locations for the Initial Mining Area ......................... 1
2.2 Monument Locations for Future Mining Areas ........................... 1
2.3 Surface Monitoring Frequency and Duration ............................. 2
3.0 SUBSURFACE MONITORING .......................................... 2
3.1 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 ....................... 4
7.0 REFERENCES ......................................................... 5
List of Fieures
Paee
Figure 1. Subsidence Monitoring Plan for Yankee Gulch Lease ..................... 6
Figure 2. Schematic of Typical Well Completion with TDR Installation and
Monitoring and [nstnunentation String ................................. 7
Agapito Associates, Inc.