LINE 4A & 4B AMMO ASSEMBLY
Site Description
The IRP site consists of the contamination from past munitions production. Any contamination from current activities will be addressed under compliance (non-ER,A funding).
Lines 4A and 4B are located in the north-central portion of the plant and are approximately 1000 feet apart. Line 4A encompasses 20 acres and Line 4B encompasses 17 acres. Both lines were constructed in 1941 for component assembly.
Line 4A produced detonators and was in operation between 1942 and 1945; it was reopened in 1982. It is currently leased to a private corporation (ICI), who reworked the line to make air-bag initiators, and operations have ceased. There are 12 buildings in the area which consists of an assembly building, mixer buildings, lead azide magazine, detonator service magazine and change houses. Hazardous substances at Line 4A include lead azide, RDX, lead styphnate, tetracene, barium nitrate, TNT, HMX, and metals. Fourteen in-ground sumps (treatment tanks) underwent RCRA closure in 1995.
Line 4B is an assembly facility for components manufactured elsewhere. Operations began in 1941 and ceased in 1945. Production resumed in 1962 and the line was used for missile assembly in the late 1960’s. Line 4B consists of a fuse assembly and equipment building, detonator service magazine, rest houses and change houses. Hazardous substances of concern are TNT, RDX, Composition B, HMX, and LX-14. Previous materials included tetryl, booster pellets and fuze ingredients.
The PA/SI was completed in 1991, and the initial RI was completed in May 1996. The Interim ROD requires the removal of 153cy of contaminated soil from Line 4A and none from Line 4B. This soil will be taken to the Inert Disposal Area (IAAP-020) and sorted by contaminant level and type. Remedial design sampling, conducted in 2004, did not locate soil contaminants above action levels.
Cleanup Strategy
This site is considered Response Complete and requires no further action under the IRP per the Phase 4 Soil Remedial Action Report. No contamination found above action levels. This site is considered Response Complete as of August 2005.
The IRP will be responsible for groundwater contamination which is being evaluated in the OU6 RI/FS.