Laserfiche WebLink
Natural Soda LLC 2024 Project Status Report & Annual Plan of Development <br /> 22 January 2025 <br /> <br />4.4. Geotechnical Program (Geophysical Logging) <br />4.4.1. Subsurface Subsidence Geophysical Logging <br />NS conducted EPA mandated subsurface subsidence logging in the DS-3 SSMW well <br />January 2024. The analysis indicated no subsurface subsidence to the depth of 1,836 <br />feet. The DS-3 SSMW serves as the subsidence monitor well for the 12H and 13H mining <br />intervals. <br />4.4.2. Surface Subsidence Monitoring <br />A surface subsidence monument (SSM) survey of SSMs above NS’s area of operations <br />will be conducted during the second quarter of 2025. One new SSM was installed on <br />November 13, 2024, on the NS lease. The 18H SSM was installed above the 18H-IR-W <br />wellbore to monitor the 18H mining interval. The initial monument elevation survey of the <br />new 18H SSM will be conducted in second quarter of 2025, the installation information is <br />shown in Table 5. <br />Table 5: 2024 18H Surface Subsidence Monument (SSM) Installation <br /> <br />