HARBOR ISLAND (LEAD)
SEATTLE, WA
Operable Units
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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 | SOIL & GROUNDWATER |
Record of Decision September 30, 1993 |
Discharge (POTW) Air Stripping (P&T, exsitu) Cap (engineered cap) Discharge (surface water/NPDES discharge) Disposal (offsite) Other (not otherwise specified) Oil Water Separation (P&T, exsitu) Incineration Containment (other, not otherwise specified, onsite) Treatment (other, not otherwise specified, exsitu, onsite) Solidification/Stabilization (exsitu, onsite) Thermal Treatment (insitu) Carbon Adsorption (liquid phase, P&T, exsitu) |
| 01 | SOIL & GROUNDWATER |
Explanation of Significant Differences July 26, 1994 |
Off-gas Treatment (other, not otherwise specified) |
| 01 | SOIL & GROUNDWATER |
Record of Decision Amendment January 25, 1996 |
Disposal Excavation |
| 01 | SOIL & GROUNDWATER |
Explanation of Significant Differences September 26, 2001 |
ESD - Nonfundamental Change (other) |
| 03 | LOCKHEED UPLAND |
Record of Decision June 28, 1994 |
Thermal Treatment (insitu) Monitoring Cap (engineered cap) Institutional Controls Containment (other, not otherwise specified, onsite) |
| 07 | LOCKHEED SEDIMENTS |
Record of Decision November 27, 1996 |
Monitoring Disposal (offsite) Cap (exsitu) |
| 07 | LOCKHEED SEDIMENTS |
Explanation of Significant Differences December 27, 1999 |
Cap (exsitu) Monitoring Disposal (offsite) |
| 07 | LOCKHEED SEDIMENTS |
Explanation of Significant Differences February 22, 2002 |
Disposal (offsite) Excavation Cap (exsitu) |
| 07 | LOCKHEED SEDIMENTS |
Explanation of Significant Differences March 31, 2003 |
Cap (engineered cap) Disposal (offsite) Monitoring Excavation |
| 08 | WEST WATERWAY SEDIMENTS |
Record of Decision September 11, 2003 |
No Action |
| 09 | TODD SHIPYARD SEDIMENTS | No decision document | |
| 10 | EAST WATERWAY SEDIMENTS | No decision document |