LINE 3A AMMO LAP (ARTILLERY)

 

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). This line was upgraded to include a self-contained Pinkwater Reroute System in December 1996.

Line 3A was constructed in 1941 and began operations in 1943.  The line was shut down from 1945 to 1949 then resumed operations until 1989. Line 3A encompasses 119 acres and is currently active.  The line is a load, assemble and pack operation for 155mm artillery rounds. The melt building appears to be the area where the highest volumes of wastes were produced during operations.

 

Metal cleaning operations were conducted here.  The process included several stainless steel dip tanks where ammunition casings were immersed in a sulfuric/hydrochloric acid bath, followed by a chromic acid bath and water rinsing.

 

The PA/SI was completed in 1991, and an initial RI was completed in May 1996.  The Interim ROD requires the removal of an estimated 2,040 cy (1350 cy of explosives-contaminated soil only, and 690 cy of metals and explosives-contaminated soil). Per the ROD, this soil will be taken to the Inert Disposal Area (IAAP-020) and sorted by contaminant level and type. 

 

CLEANUP STRATEGY

This site is included in the PBC awarded in 2004.

The soil contaminated with explosives and/or metals at this site have been successfully completed by excavation, in accordance with the RAOs extablished in the final ROD to protect human health and the environment.  Any contaminated soil under the infrastructures of IAAAP, and therefore inaccessible, was left in place.  Once confirmation samples determined that all accessible contaminated soil had been removed, each excavation was backfilled with clean soil to the original grade, compacted, and then reclaimed to original conditions.  All excated soil was trasported to Trench 6 in the IDA for later treatment.  A total of 1,436 cy of contaminated soil was removed from Line 3A in the Summer of 2006.  

This site is considered Response Complete (RC) as of September 2007 as documented in the Remedial Action Report for OU1 Soils Phase 5, 7, and 8 Sites and Installation Wide Ecological Evaluation.