Appendix M: Installation Narrative Summaries - denix

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From 1942 to 1956, the Nebraska Ordnance Plant (NOP)
produced munitions at four bomb-loading lines, stored
munitions, and produced ammonium nitrates. The property also
contained burn areas, an Atlas missile facility, and a sewage
treatment plant. The University of Nebraska now owns the
majority of the property. The Nebraska National Guard, U.S.
Army Reserves, and private entities own the remainder of the
property. The U.S. Army Corps of Engineers (USACE)
identified soil contaminated with polychlorinated biphenyls
(PCBs) and munitions, and on-site and off-site groundwater
contaminated with explosives and volatile organic compounds
(VOCs). EPA placed the property on the NPL in August 1990,
and EPA and the Army signed an interagency agreement (IAG)
in September 1991. USACE installed groundwater treatment
and containment systems. In FY97, USACE converted the
property's technical review committee to a Restoration Advisory
Board. In FY99, USACE completed a memorandum of
understanding with the Lower Platte National Resource District
concerning beneficial reuse of treated groundwater. USACE
installed groundwater treatment and containment systems. In
FY02, USACE approved a 5-year review of the munitions and
explosives of concern (MEC) engineering evaluation and cost
analysis (EE/CA) removal action.
To date, USACE has signed a Record of Decision (ROD) for
Operable Units (OUs) 1 and 2 and incinerated over 16,000 tons
of contaminated soil at the site. The cleanup progress at NOP
for FY02 through FY05 is detailed below.
In FY02, USACE completed the OU 2 containment construction
that is currently in the operations and maintenance (O&M)
phase. The District Commander signed the OU 2 explanation of
significant differences (ESD) and submitted it to EPA. EPA
Regional 7, the Nebraska Department of Environmental Quality,
and USACE continued to address issues with monthly project
managers meetings. USACE conducted a 5-year review of the
MEC EE/CA removal action.
In FY03, USACE performed further investigation of
trichloroethylene (TCE) groundwater contamination plume
discovered south of Load Line 1. The investigation determined
the extent of the contamination plume, which allowed the work
plans for the pre-design analysis and remedial action (RA) to be
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completed. At the request of EPA and the Department of
Justice (DOJ), USACE initiated additional investigation
activities to document and verify disposal of potential
hazardous waste materials reported by the present landowner.
In addition, both the Kansas City and Omaha Districts of the
USACE worked with the City of Omaha Municipal Utilities
District (MUD) and EPA regarding the selected location for their
new municipal water well field. The 5-year review of the MEC
EE/CA removal action was under review for approval.
In FY04, USACE developed a remedial design (RD) for
additional containment and groundwater monitoring wells.
USACE continued O&M of the treatment system and conducted
quarterly groundwater monitoring. USACE also completed work
plans for the Load Line 1 remedial action and developed an RD
for a treatment facility south of Load Line 1. In a separate effort,
USACE, EPA, and DOJ began negotiations with three
potentially responsible parties (PRPs) for cost recovery and
settlement of their environmental liability at the NOP. EPA
approved the 5-year review of the MEC EE/CA removal action.
USACE conducted a pre-design investigation in the vicinity of
the proposed monitoring wells.
In FY05, DOJ continued to lead negotiations with PRPs.
USACE initiated construction on Load Line 1 extraction wells
and air stripper treatment system (RA for OU 2). USACE began
implementation of the focused extraction portion of the OU 2
ROD. USACE also initiated a supplemental groundwater
investigation to better define the southern and eastern edges of
the plume and facilitate design of the MUD monitoring network.
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USACE continued O&M of the treatment system and quarterly
groundwater monitoring. A supplemental groundwater
investigation clearly defined the southern and eastern perimeter
of the plume, supporting the design of a supplemental
groundwater monitoring network. USACE developed and
submitted a containment evaluation work plan describing how
successful groundwater containment will be measured and
reported. USACE completed construction and started operation
of the extraction well and treatment for Load Line 1. USACE
continued legal and technical support to DOJ for settlement
discussions and litigation. The district approved the OU 2 ROD;
it has been implemented at the site.
Regulatory issues delayed the bedrock investigation.
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The district delayed completion of the OU 3 ROD until FY09 so
that it can include other MMRP sites and incorporate land use
controls.
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Plan of action items for Nebraska Ordnance Plant are grouped
below according to program category.
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0 Continue O&M of containment system, quarterly
groundwater monitoring, and complete
containment evaluation work plan in FY07.
0 Complete installation of supplemental
groundwater monitoring network on southern
and eastern perimeters in FY07.
0 Continue implementation of the focused
extraction portion of the OU 2 ROD. Place
extraction wells in center of Load Line 1
back into operation upon completion of
advanced oxidation pretreatment system in
FY07.
0 Submit 5-year review of OU 2 remedy in FY07.
0 Continue legal and technical support to DOJ
in FY07.
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There are no MMRP actions scheduled for FY07 or
FY08.
M-147