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and notified the Permittee that it is in compliance with the conditions of the permit. 13. Proposed Changes and Workovers The Permittee shall give advance notice to EPA, as soon as possible, of any planned physical alterations or additions to the permitted injection wells. Any changes in well construction require prior approval of EPA and may require a permit modification under the requirements of 40 CFR §§144.39 and 144.41. In addition, the Permittee shall provide all records of well workovers, logging, or other subsequent test data, including required mechanical integrity testing, to EPA within sixty (60) days of completion of the activity. Appendix C contains samples of the appropriate reporting forms. Demonstration of mechanical integrity shall be performed within thirty (30) days of completion of workovers or alterations and prior to resuming injection activities, in accordance with Section C paragraphs 1(a) and 2 of this part. B. CORRECTIVE ACTION Corrective action to 40 CFR §§144.55 and 146.7 may be necessary for existing wells in the Area of Review ("AOR", defined in 40 CFR §146.6) that penetrate the injection zone, or which may otherwise cause movement of fluids into USDWs. No.corrective action plan is currently required, since no known wells located within the AOR penetrate the proposed zones of injection. See Appendix A, Figure 3 and Tables 1 and 2. 1. Initial ZEI re-evaluation with Field Data Data resulting from testing performed under Section A paragraphs 4 and 5, or Section C paragraph 2, in this part will be used to confirm or modify assumptions used to calculate the original ZEI and to set the AOR. If new field data results in a ZEI larger than the AOR which includes wells penetrating the proposed zones of injection, a corrective action plan shall accordingly be proposed for approval and implemented as described in paragraph 3 of this section. 2. Annual ZEI Review Annually, the ZEI calculation shall be reviewed, based on any new data obtained from the FOT and static reservoir pressure tests required in Section A, paragraph 5(c) of this part. A copy of the modified ZEI calculations, along with all associated assumptions or justifications, shall be provided to EPA with the quarterly report due in January, as required in Section D paragraph 5 of this part. U I C Permit CA 10500002 Page I 1 of 29