Operable Units and Cleanup Progress
Below, EPA has provided a list of the remedial actions selected pertaining to each operable unit.
EPA issues Records of Decision (RODs) to explain which cleanup methods will be used at Superfund National Priorities List sites. EPA has two primary documents that it may use to identify changes to the remedies selected in RODs. EPA uses a ROD Amendment when it needs to make a fundamental change to the remedy. EPA publishes an Explanation of Significant Differences (ESD) for significant changes.
During cleanup, complex sites may be divided into several distinct areas to make the response more efficient. These areas, called operable units (OUs), may address geographic areas, specific problems, or medium (e.g., groundwater, soil) where a specific action is required. The remedies are displayed for the OU numbers indicated in the original decision document. OU numbers may change over time.
EPA is working to improve data quality. The information presented on this page is undergoing review for accuracy and completeness, and may be subject to change.
| OU ID | Name | Decision Document | Cleanup Technologies Selected in the Decision Document |
|---|---|---|---|
| 00 | SITEWIDE | Not applicable | |
| 01 | SITEWIDE-1 | No decision document | |
| 02 | INDUSTRIAL AREAS | No decision document | |
| 03 | WASTEWATER TREATMENT AND STORAGE AREAS | No decision document |
Site Milestones
| Milestone | Date(s) |
|---|---|
| Initial Assessment Completed | 05/10/2011 |
| Proposed to the National Priorities List | 05/24/2013 |
| Finalized on the National Priorities List | Not Yet Achieved |
| Remedial Investigation Started | 11/12/2015 |
| Remedy Selected | Not Yet Achieved |
| Remedial Action Started | Not Yet Achieved |
| Construction Completed | Not Yet Achieved |
| Deleted from National Priorities List | Not Yet Achieved |
| Most Recent Five-Year Review | Not Yet Achieved |
| Achieved Sitewide Ready for Anticipated Reuse | Not Yet Achieved |
During cleanup, a site can be divided into a number of distinct areas depending on its complexity. These areas, called operable units (OUs), may address geographic areas, specific problems, or areas where a specific action is required. Examples of typical operable units include construction of a groundwater pump and treatment system or construction of a cap over a landfill.
| Milestone | Start Date | Completion Date |
|---|---|---|
| OU 00 - SITEWIDE | ||
| Administrative Order of Consent (EPA Performed) | 02/26/2021 | |
| Removal (EPA Oversight) | 05/03/2021 | 09/20/2023 |
| OU 01 - SITEWIDE-1 | ||
| Administrative Order of Consent (EPA Performed) | 11/12/2015 | |
| Combined Remedial Investigation/Feasibility Study (EPA Oversight) | 11/12/2015 | Estimated Dec 2027 - Feb 2028 |
| Record of Decision | Estimated Dec 2027 - Feb 2028 | |
| OU 02 - INDUSTRIAL AREAS | ||
| Remedial Design | Estimated Mar - May 2028 | |
| OU 03 - WASTEWATER TREATMENT AND STORAGE AREAS | ||
| Remedial Design | Estimated Mar - May 2028 | |
NOTE: Dates and estimated dates will not display for all milestones. Estimated dates only display for milestones planned within the next three fiscal years. Estimated dates and start dates will not display for the following enforcement milestones: Administrative Order of Consent, Consent Decree and Unilateral Administrative Order. Start dates will not display for the following document milestones: Five-Year Review, Record of Decision, Record of Decision Amendment, Explanation of Significant Differences and Partial NPL Deletion.
DISCLAIMER: The data on this page are derived from the Superfund Enterprise Management System and are solely for informational purposes. The data cannot be relied upon to create any substantive or procedural rights or requirements enforceable by any party in litigation with any member of the public, states, tribes, the United States or any federal agency. EPA reserves the right to change these data at any time without public notice.