Appendix M: Installation Narrative Summaries - denix

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From 1941 to 1944, the Former Weldon Spring Ordnance
Works (WSOW) produced explosives for the Armed Services.
The Army Reserves currently occupy the 1,655-acre Weldon
Spring Training Area. The State of Missouri owns the majority
of the remaining property and maintains it as a wildlife area and
an agricultural research facility of the University of Missouri.
Sites identified include lagoons, landfills, burning grounds,
contaminated soil, underground wastewater pipelines, and
groundwater. Primary contaminants affecting groundwater and
soil are TNT, DNT, lead, polychlorinated biphenyls (PCBs), and
polyaromatic hydrocarbons (PAHs). EPA placed the WSOW on
the NPL in February 1990. The U.S. Army Corps of Engineers
(USACE) and EPA signed an interagency agreement (IAG) in
1990, which was amended in FY91. The Atomic Energy
Commission acquired a parcel covering approximately 200
acres in the early 1950s that it used for a uranium ore feed
material plant. DoD provides partial funding for the cleanup of
this site, which is being investigated and remediated by DOE as
a separate NPL site. USACE formed a Restoration Advisory
Board (RAB) in FY97 and disbanded the RAB in FY04. USACE
conducted a 5-year review in FY03 and submitted it to EPA in
FY04.
Two operable units (OUs) exist at the former WSOW: OU 1
(soil and pipeline) and OU 2 (groundwater). USACE signed a
Record of Decision (ROD) for OU 1 in FY96, and for OU 2 in
FY04, and completed the explaination of significant differences
for OU 1 in FY01. The cleanup progress at the former WSOW
property for FY02 through FY05 is detailed below.
In FY02, DOE and USACE generated the OU 1 closure report
and submitted it to Missouri Department of Natural Resources
(MDNR) and EPA for comment. They also submitted the draft
explanation of significant differences to the regulatory agencies.
The Army made a potentially responsible party payment to
DOE. Groundwater monitoring for OU 2 continued. USACE
procured a long-term monitoring contract, as part of a pilot
study, to complete the remainder of the monitoring and
sampling for the collection of data to be used in the revised
feasibility study (FS). A work plan for groundwater sampling
and well installation was completed. USACE installed five
monitoring wells to aid in determining the extent of groundwater
FUDS
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contamination and removed approximately 0.8 bulk cubic yards
of TNT-contaminated soil from two locations.
In FY03, USACE submitted the 5-year review and continued
groundwater monitoring. Two additional OU 1 sites, T13 and
T14, were identified. USACE modified the work plan for
remediation at T13, leading to a faster execution timeline and
awarded a contract for remediation of this site. T14 required no
further action. USACE used geographic information system
technology to present groundwater data more effectively. The
Army initiated the closed, transferred, or transferring (CTT)
ranges and site inventory for the Military Munitions Response
Program (MMRP). RAB members participated in groundwater
remediation decisions and the 5-year review process.
In FY04, USACE completed the supplemental FS, proposed
plan, public review period and meeting for OU 2. The Army,
MDNR, and EPA signed the ROD for the OU 2 and selected
monitored natural attenuation with land use controls as the
appropriate remedy. USACE completed the OU 1 closure and
T13 remediation, and submitted the final remedial action (RA)
report and the 5-year review to EPA. The Army conducted the
CTT ranges, site inventory, and concluded that all
contaminated burning grounds were being cleaned up under
FUDS and DOE work. No CTT ranges or sites containing
unexploded ordnance, discarded military munitions or munitions
constituents reported for the Phase III inventory were located
on the former WSOW property.
In FY05, USACE closed out and completed contract task orders
for OU 1 in accordance with FUDS policy. USACE completed
the remedial design work plan and Phase I RA work plan for
OU 2 and regulators approved the plan. USACE obtained EPA
and MDNR concurrence on closeout of OU 1 and completed
the interim RA report. USACE completed the Phase II RA work
plan and the second and third rounds of groundwater
monitoring as part of the ongoing RA for OU 2.
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USACE worked to complete project closeout of the WSOW
projects. This is the last installation narrative for this property.
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The USACE has identified no MMRP sites at this property.
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Plan of action items for Former Weldon Spring Ordnance
Works are grouped below according to program category.
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0 Pursue project closeout in FY07.
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There are no MMRP actions scheduled for FY07 or
FY08.
M-65