| MSOP-21 Significant Modification Application (R3-4 SM2) | Application | AUG-04-2023 |
| MSOP-21 Extension of Compliance: Pressure relief device (PRD) | Memo | FEB-08-2023 |
| MSOP-21 #65196 Apr-Sep 2022 | Report | NOV-18-2022 |
| MSOP-21 SM1 calculations | Spreadsheet | SEP-21-2021 |
| Significant Modification #1 MSOP-21 Chemical Manufacturing | Permit | SEP-21-2021 |
| MSOP-21 SM1 statement of basis | Statement of Basis | SEP-21-2021 |
| MSOP-21 SM1 EPA response, no comments on draft permit | Email | SEP-07-2021 |
| MSOP-21 SM1 | Public Notice Document | AUG-16-2021 |
| MSOP-21 SM1 | Public Notice Document | AUG-16-2021 |
| MSOP-21 SM1 e-mail transmittal to EPA and affected states | Email | AUG-16-2021 |
| MSOP-21 SM1 e-mail transmittal to facility | Email | AUG-16-2021 |
| MSOP-21 SM1 e-mail transmittal to public depository | Email | AUG-16-2021 |
| MSOP-21 SM1 draft/proposed permit and statement of basis | Draft/Proposed Permit | AUG-16-2021 |
| MSOP-21 MM2 EPA response - no comments on draft permit | Email | JUN-04-2021 |
| MSOP 21 Minor Modification # 2 Chemical Manufacturing | Old Permit | JUN-04-2021 |