LINE 800 PINKWATER LAGOON
Site Description
The Line 800 Pinkwater Lagoon consisted of an unlined, 5 acre impoundment, 4 feet deep, surrounded by an earthen berm. This lagoon was located adjacent to Line 800 (IAAP-011) and an intermittent tributary to Brush Creek. The primary activity at Line 800 was ammunition renovation from 1943 to 1980.
From 1980 to present, primary activities at Line 800 include remote disassembly of projectiles and assembly of 75mm and 105mm blanks. The Pinkwater Lagoon was constructed in 1943 for the disposal of pink water effluent from adjacent Line 800 production facilities and sludges trucked in from other line operations within the installation. In 1943 leaching fields associated with the lagoon to include evaporation furrows were constructed. The lagoon also received metal cleaning sludge from Line 3 operations. In the early 1970s this lagoon ceased to be used.
Studies conducted in 1991 through 1998 indicated that primary waste disposed at the site included explosives-contaminated wash water and heavy metals from operations at Line 800 and other production lines. Carbon and fly ash disposal may also have occurred at the site. As a result of the RI sampling 63,236cy of explosives-contaminated soils were excavated from this area during 1997. The excavated soils contained greater than 80,000 lbs of explosives. This soil was taken to the Inert Disposal Area (IAAP-020) and sorted by contaminant level and type.
Two additional areas of explosives soil contamination were found in 1998. One area in the southwest portion of the lagoon was found to require no action. The other area, in settling basin #1, requires additional characterization and excavation.
The lagoon currently is used as a phytoremediation wetlands treatment cell.
The Army has determined that the facilities 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. Additional evaluation of soil beneath the slabs will be required after the demolition.
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 established in the final ROD to protect human health and the environment. Any contaminated soil under the infrastructures of IAAAP, and therefore inacccessible, 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 excavated soil was transported to Trench 6 in the IDA for later treatment. A total of 5,669 cy of contaminated soil was removed from Line 800 in the Summer/Fall 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.