Table 1

Description of Operable Units at BNL

Operable Unit
Description

I

Operable Unit I is a relatively undeveloped 950-acre area in the southeastern part of the site. It includes historical waste handling areas, such as the Former and Current Landfills (AOCs 2 and 3), and the Former Hazardous Waste Management Facility (AOC 1). It also includes the Ash Pit (AOC 2F) and two recharge basins (AOCs 24E & 24F).

Operable Unit I contains six areas covered by accelerated removal actions: the Current and Former Landfills, Chemical/Animal Pits and Glass Holes, the Interim Landfill, the Slit Trench and Groundwater.

III
Operable Unit III contains the south central and developed portions of the site. This operable unit contains most of the site’s contaminated groundwater.

II/VII
Operable Unit II/VII consists of several AOCs located in the developed central portion of the site. It includes contaminated soils and out-of-service underground storage tanks and pipelines proposed for removal at the Waste Concentration Facility (AOC 10), along with various isolated areas of contaminated surface soils (AOC 16,17,18). It also includes the BLIP facility (AOC 16K).

IV
Operable Unit IV is located on the east-central edge of the developed portion of the site. It includes the 1977 Oil/Solvent Spill (AOC 5) as well as the Reclamation Facility Building 650 and Sump Outfall Area (AOC 6), where radiologically contaminated soils have been found. A Record of Decision has been issued for this Operable Unit and an Interim Remedy of access restrictions and monitoring has been implemented for AOC 6. The final remedy for the radiologically contaminated soils (AOC 6) is included in this Record of Decision.

V
Operable Unit V is located in the northeast portion of the site and includes the Sewage Treatment Plant (AOC 4) and releases to the Peconic River.

VI
Operable Unit VI is located on the southeastern edge of the site. It is a largely wooded area which contains various agricultural research fields and human made experimental basins (AOC 8). No contaminated soils of concern have been found in this operable unit, however, contaminated sediments in two of the human made basins pose an ecological risk to the Tiger Salamander. Ethylene dibromide, a pesticide, has been found in groundwater south of BNL’s southern boundary, and is addressed in a separate Record of Decision.

Operable Unit	Description
I	Operable Unit I is a relatively undeveloped 950-acre area in the southeastern part of the site. It includes historical waste handling areas, such as the Former and Current Landfills (AOCs 2 and 3), and the Former Hazardous Waste Management Facility (AOC 1). It also includes the Ash Pit (AOC 2F) and two recharge basins (AOCs 24E & 24F). Operable Unit I contains six areas covered by accelerated removal actions: the Current and Former Landfills, Chemical/Animal Pits and Glass Holes, the Interim Landfill, the Slit Trench and Groundwater.
III	Operable Unit III contains the south central and developed portions of the site. This operable unit contains most of the site’s contaminated groundwater.
II/VII	Operable Unit II/VII consists of several AOCs located in the developed central portion of the site. It includes contaminated soils and out-of-service underground storage tanks and pipelines proposed for removal at the Waste Concentration Facility (AOC 10), along with various isolated areas of contaminated surface soils (AOC 16,17,18). It also includes the BLIP facility (AOC 16K).
IV	Operable Unit IV is located on the east-central edge of the developed portion of the site. It includes the 1977 Oil/Solvent Spill (AOC 5) as well as the Reclamation Facility Building 650 and Sump Outfall Area (AOC 6), where radiologically contaminated soils have been found. A Record of Decision has been issued for this Operable Unit and an Interim Remedy of access restrictions and monitoring has been implemented for AOC 6. The final remedy for the radiologically contaminated soils (AOC 6) is included in this Record of Decision.
V	Operable Unit V is located in the northeast portion of the site and includes the Sewage Treatment Plant (AOC 4) and releases to the Peconic River.
VI	Operable Unit VI is located on the southeastern edge of the site. It is a largely wooded area which contains various agricultural research fields and human made experimental basins (AOC 8). No contaminated soils of concern have been found in this operable unit, however, contaminated sediments in two of the human made basins pose an ecological risk to the Tiger Salamander. Ethylene dibromide, a pesticide, has been found in groundwater south of BNL’s southern boundary, and is addressed in a separate Record of Decision.