Superfund Information Systems: Site Profile

Superfund Site:

NCR CORP. (MILLSBORO PLANT)
MILLSBORO, DE

Operable Units

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 OU01 Record of Decision
August 12, 1991
Air Stripping (P&T, exsitu)
Carbon Adsorption (liquid phase, P&T, exsitu)
Coagulation/Flocculation (P&T, exsitu)
Discharge (infiltration basin/trench)
Discharge (surface water/NPDES discharge)
Extraction (recovery/vertical well)
Filtration (P&T, exsitu)
Institutional Controls
Monitoring
Other (NOS)
01 OU01 Explanation of Significant Differences
March 27, 1996
Air Sparging (physical treatment, insitu)
Vapor Extraction (insitu)
01 OU01 Explanation of Significant Differences
September 29, 1998
Air Sparging (physical treatment, insitu)
Vapor Extraction (insitu)
01 OU01 Explanation of Significant Differences
September 27, 2016
Bioremediation (aerobic, insitu)
Bioremediation (bioaugmentation, insitu)
Chemical Oxidation (insitu)
Chemical Reduction (insitu)
ESD/Amd - Remedy Element Addition/Modification

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