Appendix M: Installation Narrative Summaries - denix

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Operations at the Blaine Naval Ammunition Depot (NAD)
subsite contributed to groundwater and soil contamination at
the Hastings Groundwater Contamination Site. The U.S. Army
Corps of Engineers (USACE) designated five operable units
(OUs) at the property: three OUs for the 2,900-acre Hastings
East Industrial Park area, which includes soil (OU 4), the
vadose zone (OU 8), and groundwater (OU 14); an OU for the
naval yard dump, the explosives disposal area, and the bomb
and mine complex (OU 16); and an OU for a 44,500-acre area
of the former NAD not included in the other OUs (OU 15). EPA
placed the property on the NPL in June 1986, and the Army
and EPA signed an interagency agreement (IAG) in 1998.
USACE formed a Restoration Advisory Board at this property.
To date, EPA has signed two Records of Decision (RODs), one
for removal of explosives and metal contaminated surface soil,
and a second in FY02 for removal of carcinogenic polyaromatic
hydrocarbons (cPAH)-contaminated surface soil. The Army
approved a Military Munitions Response Program (MMRP)
project in FY96. The cleanup progress for the Hastings
Groundwater Contamination Site for FY02 through FY05 is
detailed below.
In FY02, USACE completed the OU 4 proposed plan (PP) and
ROD for the cPAH-contaminated soils at the NAD residential
properties. The Army and EPA signed the residential cPAH
ROD, completed the design, and began soil remediation.
USACE completed the OU 15 pistol range removal action and
constructed the soil vapor extraction (SVE) system at Area 10.
The Army approved the removal action to provide alternate
water to residents with contaminated groundwater. The Army
completed the initial 5-year review.
In FY03, USACE completed the cPAH remedial action (RA) for
the residential properties and installed water supply wells for
residents with contaminated groundwater. USACE completed
investigations to support the design of the OU 14 groundwater
remediation system and initiated groundwater modeling based
on the investigation results. A feasibility study (FS) to document
completed removal actions for the OU 16 sites was initiated.
USACE initiated discussions with the regulators concerning
cPAH cleanup levels for the non-residential properties.
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In FY04, USACE completed the explanation of significant
differences, which modified the FY02 cPAH ROD to include
remediation of the non-residential properties. They completed
the remedial design for the cPAH contaminated soils at the
non-residential properties and initiated the RA. USACE
completed the groundwater FS and continued groundwater
modeling optimization. USACE supported the Department of
Justice (DOJ) with litigation against a potentially responsible
party (PRP). Operation of the SVE system at Area 10 (OU 15)
continued. USACE completed the ordnance and explosive
recurring review work plan and site visit.
In FY05, USACE completed remediation of cPAH-contaminated
soils at the non-residential properties. Also, USACE completed
the installation of wells for aquifer pumping tests. Test data will
be used to enhance modeling efforts and facilitate design of
groundwater extraction systems. USACE continued technical
and legal support to DOJ in the ongoing litigation and made
progress towards settlement with a PRP. The installation
completed the munitions and explosives concern (MEC)
recurring review report and submitted it for regulatory review.
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USACE conducted additional groundwater modeling and
continued coordination with the groundwater remediation
stakeholders. Details regarding the proposed beneficial reuse
of contaminated water from the future groundwater remedy by
the Hastings power plant were defined. State regulators
provided discharge limits for the remedy surface water disposal.
USACE initiated development of the groundwater FS
addendum and PP. USACE also conducted pre-design efforts
for the groundwater RA, including completion of aquifer testing
and preliminary pipeline design. USACE supported DOJ in
settlement efforts.
Technical issues delayed the submission of the final OU 16 FS.
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Regulators approved the ordnance and explosives recurring
review report.
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Plan of action items for Hastings Groundwater Contamination
Site are grouped below according to program category.
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0 Submit and receive regulatory approval of the
Groundwater FS Addendum and PP for
groundwater remediation in FY07.
0 Address regulatory comments from the draft OU
15 baseline risk assessment and submit the
final risk assessment for review in FY07.
0 Complete the removal action to address the
lead contamination identified at the new OU
16 property and submit final OU 16 FS to
regulators in FY07.
0 Assist DOJ to finalize PRP settlement in
FY07.
0 Initiate preliminary RA design efforts in
FY07.
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0 Evaluate recommendations included in the MMRP
recurring review report and implement as
required in FY07.
M-96