2025-08-28_HYDROLOGY - M1983194 ‎(7)‎

• Permit No: M1983194
• IBM Index Class Name: Hydrology
• Doc Date: 8/28/2025
• From: NSI
• To: EPA
• Archive: No

Natural Soda LLC 2024 Project Status Report & Annual Plan of Development
ii January 2025
Table of Contents:
1.0 Introduction and Project Summary .................................................................. 1
2.0 Description of Project Area.............................................................................. 1
2.1. Location and Regional Setting ................................................................... 1
2.2. Leasehold Status ....................................................................................... 6
3.0 Project Status .................................................................................................. 6
3.1. 2024 Project Activities (Confidential) ......................................................... 6
3.1.1. Items of Significance (Confidential) ....................................................... 6
3.1.2. 2024 Monthly Bicarbonate Summary (Confidential) .............................. 7
3.1.3. Mining Interval Bicarbonate Production (Confidential) ........................... 7
3.1.4. Regulatory Review (Confidential) .......................................................... 8
3.2. Proposed 2025 Activities and Schedule (Confidential) ............................ 11
3.2.1. Processing (Confidential) .................................................................... 11
3.2.2. Well field (Confidential) ........................................................................ 11
3.2.3. EPA Notification – Schedule of Planned Mechanical Integrity Test (MIT)
(Confidential) ....................................................................................... 11
3.2.4. EPA Notification – Schedule of Planned Surface Subsidence
Monuments (SSM) Survey (Confidential) ............................................ 12
3.2.5. EPA Notification – Schedule of Planned Subsurface Subsidence
Monitor Well (SSMW) Logging (GR/CCL) (Confidential) ..................... 12
4.0 2024 Project Activities ................................................................................... 13
4.1. On-Site Facilities and Process Description .............................................. 13
4.1.1. General Arrangement .......................................................................... 13
4.1.2. Lab Operation / Sanitation / ISO .......................................................... 13
4.1.3. Process, Utilities, Facilities .................................................................. 13
4.1.4. Wells Associated with the NS Project (Confidential) ............................ 15
4.1.5. Other Activities .................................................................................... 16
4.2. New Findings or Developments (Confidential) ......................................... 19
4.3. 2024 Operation Results (Confidential)...................................................... 20
4.4. Geotechnical Program (Geophysical Logging) ........................................ 22
4.4.1. Subsurface Subsidence Geophysical Logging .................................... 22
4.4.2. Surface Subsidence Monitoring ........................................................... 22
4.5. Water Supply Well Pumpage ................................................................... 23
5.0 Environmental Monitoring and Protection...................................................... 24
5.1. Hydrology Monitoring ............................................................................... 24
5.1.1. Introduction .......................................................................................... 24
5.1.1. Monitoring Wells .................................................................................. 24
5.1.2. Storage and Evaporation Ponds .......................................................... 25