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d. Instrumentation skids at well sites that may be reactivated will be shut down, locked, and left in place. e. Required electrical power will remain to supply power as needed to conduct preventive maintenance procedures during the temporary suspension period. 3. Monitoring, Record Keeping, and Reporting of Results. The permittee is required to carry out the applicable activities during Temporary Suspension, as described in the Groundwater and Surface Water Monitoring Plan (Appendix I) and Subsidence Monitoring Plan (Appendix .>). a. Well Field Monitoring Program, The monitoring requirements for Class III wells are specified in 40 CFR 146.33. Samples and measurements shall be representative of the monitored activity. The permittee shall utilize the applicable analytical methods described in Table i of 40 CFR 136.3, or in Appendix III of 40 CFR 261, or in certain circumstances, by other methods that have been approved by the EPA Administrator. American Soda's monitoring program shall follow those requirements and shall include these elements: 1. Mechanical integrity testing (MIT) will be performed on the well's casing once the temporary plugs are in place. To fulfill the requirements of 40 CFR 144.52(a)(6), a mechanical integrity test will be conducted every two years for as long as the well is in temporary suspension status. 2. Results of any MIT shall be submitted in the first quarterly monitoring report after the MIT has been conducted and shalt include the following information: i date, time, and interval of each MIT measurement; ii individual(s) who performed the MIT measurements; iii dates of calibration of the MIT equipment; iv equipment and technique used to collect MIT measurements. 3. The test pressure during an MIT performed to demonstrate non- endangerment during the temporary suspension period shall be no less than 300 psi. During the 30 minute pressure test, an observed pressure change of more than ]0% shall be deemed a MIT failure. The MIT shall be performed by applying pressure to the casing above the bridge plug set in the well during temporary suspension. At the conclusion of a test, the applied pressure shall be bled to zero. 4. If a well does not successfully pass an MIT or non-endangerment demonstration, the permittee may repair the well by submitting an approvable corrective action (repair) plan to the Director within 30 days of the MIT failure. Upon completion of the repairs, the permittee shall retest the well and demonstrate mechanical integrity. 5. If a well does not successfully pass an MIT or non-endangerment demonstration and the corrective action (repair) plan has not been submitted to EPA for approval, it shall be plugged and abandoned in accordance with an EPA-approved plugging and abandonment plan within 60 days, unless the Draft Addendum to SOB For Modification No. 9, UIC Area Permit No. C030858-00000 Page I1 of17