Published: September 1999

The U.S. Department of Energy (DOE) announces the availability of a document relating to the environmental restoration activities at Brookhaven National Laboratory (BNL). The Brookhaven Linac Isotope Producer Engineering Evaluation/Cost Analysis report is available for review at the libraries listed below.

The public comment period is from September 20 to October 19, 1999. Written comments may be mailed to:

George Malosh, Brookhaven Group Manager
U.S. Department of Energy-Brookhaven Group
Bldg. 464
P.O. Box 5000
Upton, NY 11973-5000

The BLIP Engineering Evaluation/Cost Analysis addresses a localized area of soil contamination in the northwestern section of BNL property. This soil contamination originated from operations of the Brookhaven Linac Isotope Producer, or BLIP.

BLIP is a facility that produces radioactive isotopes used in medicine for both research and therapy. BLIP has been in operation since 1972.

Routine BLIP operations generate particles called "neutrons" that pass through the soil beneath the BLIP building. These neutrons may react with atoms already present in the soil to form radioactive elements. As a result, soil located beneath BLIP has become contaminated with several radioactive elements. Most of these elements are very short-lived, and decay in a few days to a few months. However, tritium and sodium-22, both of which have been found in soil and groundwater near BLIP, are longer-lived, having radioactive half-lives of 12.5 and 2.6 years, respectively. Therefore, they have a greater potential to affect groundwater.

Brookhaven Lab has responded to the BLIP contamination in a number of ways. The Lab re-routed rainwater downspouts on the BLIP building and placed an impermeable cap over the BLIP target area to prevent rainwater from draining through contaminated soils and moving radioactive elements into the groundwater. Also, Brookhaven Lab has more thoroughly characterized groundwater in the area by taking additional groundwater samples and by installing additional permanent monitoring wells.

The Engineering Evaluation and Cost Analysis evaluates five cleanup alternatives for soils at BLIP. The alternatives include: maintenance of the existing cap, upgrade of the existing cap, in-place containment of soils using cement grout, in-place containment of soils using a colloidal silica grout, and excavation of the contaminated soils. Use of a cement or colloidal silica grout would involve injecting the grout into the ground below the BLIP building to immobilize the soil and contaminants, holding them in place while the radioactive elements decay.

The recommended alternative is upgrade of the existing cap and in-place containment by injecting a colloidal silica grout. This alternative is preferred for its greater ease of implementation and ability to contain the contaminants in place. Groundwater monitoring will continue.

This recommendation is contingent on grout performance tests that are currently underway. If these tests indicate that the colloidal silica grout will not meet performance goals, then the cap upgrade alone will be the recommended alternative.

Following the public comment period, all comments will be reviewed and considered. The selected alternative will be documented in an Action Memorandum, which will be made available to the public later this year. The final remediation decision will be made jointly by the DOE, the U.S. Environmental Protection Agency, and the New York State Department of Environmental Conservation.

Located in Upton, N.Y., BNL is classified as an Inactive Hazardous Waste Site by the New York State Department of Environmental Conservation. BNL is on the U.S. Environmental Protection Agency's National Priority List.

For more information, contact:

Gail Penny
U.S. Department of Energy
(516) 344-3429

Eloise Gmur
Brookhaven National Laboratory
(516) 344-6336
egmur@bnl.gov

Mary Logan
U.S. Environmental Protection Agency
(212) 637-4321

Jim Lister
N.Y. State Dept. of Environmental Conservation
(518) 457-3976

Copies of the BLIP Engineering Evaluation/Cost Analysis are available for review at:

Longwood Public Library
800 Middle Country Rd
Middle Island, NY
(516) 924-6400

Mastics-Moriches-Shirley Public Library
301 William Floyd Parkway
Shirley, NY
(516) 399-1511

BNL Research Library
Building 477A
Upton, NY
(516) 344-3483

U.S. EPA, Region II Library
290 Broadway
New York, NY
(212) 637-4296