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Table of Contents <br /> Page <br />1.0 INTRODUCTION ...................................................... 1 <br />Z.0 SURFACE SUBSIDENCE MONITORING ................................. 1 <br /> 2.1 Initial Mining Area Surface Monuments ................................ 1 <br /> 2.2 Monument Locations for Future Mining Areas ........................... 2 <br /> 2.3 Surface Monitoring Frequency and Duration ............................. 2 <br />3.0 SUBSURFACE MONITORING .......................................... 2 <br /> 3.1 Time Domain Reflectometry ......................................... 2 <br /> 3.2 Borehole Geophysics3 <br /> 3.3 Solution Cavity Characterization ...................................... 3 <br /> 3.4 Subsurface Monitoring Frequency and Duration3 <br />4.0 REPORTING .......................................................... 4 <br />5.0 MITIGATION ................................:........................ 4 <br />6.0 REFERENCES ......................................................... 4 <br />FINAL: Modification No. 9, UIC Area Permit No. CO30858-00000 <br />Page 41 of 46' <br />