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Natural Soda LLC 2023 Project Status Report& Annual Plan of Development <br /> 31 January 2024 <br /> <br />5.2. Injection Well Mechanical Integrity (MIT) <br />5.2.1. MIT Introduction <br />The EPA Underground Injection Control (UIC) regulations require that an injection well <br />have mechanical integrity at all time (40 CFR 144.28 (f)(2) and 40 CFR 144.51 (q)(1)). A <br />well has mechanical integrity (40 CFR 146.8) if: <br />• There is no significant leak in the tubing, casing or packer; and <br />• There is no significant fluid movement into an underground source of <br />drinking water (USDW) through vertical channels adjacent to the injection <br />wellbore. <br />The mechanical integrity of an injection well must be maintained at all times. <br />Mechanical integrity pressure tests are required initially upon construction and at least <br />every five (5) years. If for any reason the tubing/packer is pulled, however, the injection <br />well is required to pass another mechanical integrity test prior to recommencing <br />injection regardless of when the last test was conducted. The Regional UIC program <br />must be notified of the workover and the proposed date of the pressure test. The well's <br />test cycle would then start from the date of the new test if the well passes the test and <br />documentation is adequate. Tests may be required on a more frequent basis <br />depending on the nature of the injectate and the construction of the well. <br />5.2.2. Mechanical Integrity, Part 1 Pressure Testing and Part 2 <br />Temperature Logging <br />NS conducted routine, EPA mandated, MIT Part 1 pressure testing and/or Part 2 <br />temperature logging in the following injection wells on the indicated dates, no anomalies <br />were detected during any testing or logging. All required documentation was submitted <br />to the EPA and cc’d to the BLM. <br />• 17H-IR-E MIT P2 (Initial) January 18, 2023 <br />• 12H-IR MIT P2 (5 Year) February 17, 2023 <br />• 12 H-IR MIT P1 (5 Year) February 24, 2023 <br />• 13H-IR MIT P2 (5 Year) July 17, 2023 <br />• 13H-IR MIT P1 (5 Year) July 18, 2023 <br />• 15H-R(I) MIT P1 (5 Year) August 2, 2023 <br />• 12H-I MIT P2 (10 Year) August 4, 2023 <br />• 15H-R(I) MIT P2 (5 Year) July 31, 2023 <br />• 13H-R(I) MIT P2 (5 Year) October 9, 2023 <br />• 13H-R(I) MIT P1 (5 Year) October 10, 2023 <br />