Appendix M: Installation Narrative Summaries - denix

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Rocky Mountain Arsenal (RMA) operated as a chemical
munitions production facility from 1942 until 1982. It has been
the focus of an aggressive cleanup program since the 1980s.
Contaminated sites included liquid waste in unlined and lined
lagoons and basins, open burning and detonation areas,
structures, and landfills that received both liquid and solid
wastes. Primary contaminants of concern are compounds used
for chemical weapons materiel production and pesticides.
Contaminated soil responses have included excavations and
treatment of soil, disposing of contaminated soil in landfills, and
capping contaminated soil sites. In July 1987, EPA placed the
installation on the NPL. The Army and EPA signed an
interagency agreement (IAG) and federal facility agreement
(FFA) in FY89. The installation was divided into two operable
units (OUs), one containing all on-post sites and another for
those off-post. In FY01, the Army discovered 10 M139
bomblets containing sarin, which it destroyed using the
Explosive Destruction System. In 1994, the Army converted its
technical review committee into a Restoration Advisory Board
(RAB). In 1996, the Army and Shell Oil Company (a potentially
responsible party) formed an oversight partnership that
developed a remedial design (RD) implementation schedule for
the On-Post OU. The initial 5-year review covering both OUs
was competed in FY01. EPA delisted 957 acres from the NPL
in FY03 and 7,399 acres in FY06.
Environmental studies identified 209 sites, potentially requiring
remediation at RMA. To date, the Army has transferred
approximately 17,000 acres. In FY96, the Army and regulators
signed Records of Decision (RODs) for both OUs at the
installation. Prior to the signing of the RODs, the Army
completed 14 interim responses at 17 sites at the Arsenal,
including the installation of five groundwater extraction and
treatment systems on-post and one off-post. The cleanup
progress at RMA for FY02 through FY05 is detailed below.
In FY02, the installation completed the RD of the last disposal
facility, the Enhanced Hazardous Waste Landfill (ELF), and the
Section 35 soil remediation projects. The Army completed
remedial actions (RAs) for the South Plants structure
demolition, the M-1 Pits soil remediation, and the South Plants
Balance of Areas and Central Processing Area soil remediation
projects. The RAB continued to focus on providing input and
Army
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comments to RDs, as well as sharing information with other
interested stakeholders.
In FY03, the Army completed the RD for the Section 36
Balance of Areas soil remediation and the Basin F Wastepile
remediation projects. The installation completed the RA for the
post-ROD removal actions for structures. EPA deleted 957
acres from the NPL, 929 of which were transferred to the
General Services Administration (GSA) for disposal. The Army
completed an inventory of closed, transferred, and transferring
ranges and placed the inventory in the on-site library. The
inventory identified 25 closed unexploded ordnance, discarded
military munitions, or munitions constituents sites and 3 closed
military ranges totaling 459 acres. None of the sites were found
to be eligible for the Military Munitions Response Program
(MMRP).
In FY04, the Army began the construction of the South Plants
cover and RA construction (RA-C) of the ELF. The Army
completed RAs for the Existing Sanitary Landfills (fieldwork),
the Burial Trenches soil remediation, the Hex Pit soil
remediation (redesign), the Section 35 soil remediation, the
Secondary Basins soil remediation, and the North Plants
structure demolition and removal projects. The installation
continued operation of the RCRA Hazardous Waste Landfill
and the Basin A Consolidation Area. The Army transferred
approximately 4,929 acres to the Department of the Interior and
126 acres to local governments, reducing the area at the RMA
listed on the NPL from an original total of 27 square miles to
approximately 17.5 square miles. GSA completed the sale of
the Western Tier Parcel, totaling 929 acres.
In FY05, the installation awarded contracts to perform RAs for
the Shell Disposal Trenches remediation and the Basin F
Wastepile remediation projects. The installation completed the
construction completion report for the Existing (Sanitary)
Landfill remediation project and continued operations at the
Groundwater Intercept and Treatment System north of the
Basin F Well. The Army initiated the installation's second 5-year
review.
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The installation completed the RD and began construction on
the Shell Disposal Trenches remediation cover and the
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Hazardous Waste Landfill cap. The installation completed RA-C
at the ELF. RMA began excavation of the Basin F Wastepile. It
also completed a ROD Amendment and drafted the RDs for the
former Basin F Principal Threat and Section 36 Lime Basins
soil remediation projects. The Army completed remediation of
7,399 acres, and EPA removed these acres from the NPL. Of
these acres, the Army transferred 7,258 to the U.S. Fish and
Wildlife Service, but retained jurisdiction of areas containing
water treatment systems.
Technical issues delayed the RD for the North Plants soil
remediation projects. The RD remains in negotiations, and a
completion date cannot be determined. An expanded scope of
work for the Munitions Testing soil remediation project delayed
the RA. Regulatory issues delayed the second 5-year review.
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The Army has identifed no MMRP sites at this installation.
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Plan of action items for Rocky Mountain Arsenal are grouped
below according to program category.
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0 Complete RDs for Section 36 Lime Basins soil
remediation projects in FY07-FY08.
0 Complete RA for the Section 35 soil
remediation, Section 36 Balance of Areas, and
Miscellaneous Southern Tier soil remediation
in FY07-FY08.
0 Complete the second 5-year review and the
Basin F Wastepile soil remediation project in
FY07-FY08.
0 Begin RA for the former Basin F Principal
Threat soil remediation and Section 36 Lime
Basins soil remediation projects in
FY07-FY08.
0 Complete RA for the Munitions Testing soil
remediation in FY07-FY08.
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There are no MMRP actions scheduled for FY07 or
FY08.
M-177