LINE 9 AMMO LAP (MINE)-GROUNDWATER

 

SITE DESCRIPTION

The IRP site consists of the groundwater contamination from past munitions production. Any contamination from current or future activities will be addressed under compliance (non-ER,A funding).

Line 9 is about 9 acres in size and was built in 1942 for use as a production facility and produced mine and mine fuses during the Vietnam War. This Line is in modified caretaker status. The PA/SI was completed in 1991, and an initial RI was completed in May 1996. During the Supplemental RI, completed in 2003, high levels of freon were found in groundwater. 

Freon-113 in concentrations of up to 220 ppm has been found in the groundwater. The plume likely extends over approximately five acres, and has been found to produce concentrations that displace oxygen at levels that represent a risk to human health. This information has been provided to AO Safety.

The Army has determined that the faciities at this Line are excess and will pursue non-ER,A funding for building demolition and debris removal, which is listed as an option in the PBC.

Phase progress will be tracked at this PBC Site, but funding requirements will be tracked under Site PBC at Iowa.  Post PBC costs will be covered under Site IAAP-020.

CLEANUP STRATEGY

This site is included in the PBC awarded in 2004.  The remedial approach for this site, as well as others in the Brush Creek watershed, will be assessed in the FS.  At present, it is presumed that localized areas of contamination will be remediated.

STATUS

RRSE RATING: Low

CONTAMINANTS: Semi-volatiles

MEDIA OF CONCERN: Groundwater

COMPLETED IRP PHASE: PA/SI

CURRENT IRP PHASE: RI/FS

FUTURE IRP PHASE: RD, RA(C), RA(O), LTM