NS 2023 Annual Report For EPA

• IBM Index Class Name: Hydrology
• Doc Date: 8/28/2025
• Archive: No

Natural Soda LLC 2023 Project Status Report & Annual Plan of Development
12 January 2024

3.2. Proposed 2024 Activities and Schedule (Confidential)
3.2.1. Processing (Confidential)
NS anticipates sodium bicarbonate production of approximately 250,000 tons in 2024.
Brief, routine shut-downs for periodic boil-outs and maintenance activities will occur as
necessary.
3.2.2. Well field (Confidential)
• NS plans on drilling two new production wells to establish the western portion
of the 18H mining interval during the spring/summer of 2024. These wells
have been permitted and approved by all agencies. The 18H-1V slant
production well will be drilled first. The 18H-IR-W production well will then be
drilled to intercept the 18H-1V within the desired Boise Bed target zone.
• NS may continue the permitting process, during 2024, for two new production
wells, the proposed 19H-1V slant production well to be drilled as the first well
of the 19H mining interval and the proposed 19H-IR-E production well to be
drilled east of 19H-1V. The 19H-IR-E will intersect the 19H-1V well, forming
the eastern portion of a new 19H mining interval.
3.2.3. EPA Notification – Schedule of Planned Mechanical Integrity
Test (MIT) (Confidential)
• Per EPA UIC Permit C030358-00000 requirements, the following routine
injection well (initial, 5-year, or 10-year) MIT Part 1 pressure testing and MIT
Part 2 temperature logging is planned for 2024 or the first quarter of 2025.
o 15H-IR-E (5-year): MIT P1 and P2 testing/logging is planned to occur
during the fourth quarter 2024 and/or the first quarter of 2025.
o 18H-IR-W MIT P1 (initial) will be conducted, as appropriate, during well
construction in 2024.
o 18H-IR-W MIT P2 baseline temp log will be run, as appropriate, during
well construction. MIT P2 initial logs are required 60-90 days post EPA
ATI.
3.2.4. EPA Notification – Schedule of Planned SSM Survey
(Confidential)
• NS conducted the biennial surface subsidence monument survey in 2023 and
the results are reported in section 4.4.2 of this report. The next biennial
surface subsidence monument survey will occur in 2025 in accordance with
UIC Permit C030358-00000 requirements.