Final Remedial Action Completion Report for the ... - Rvaap.org

Remedial Action Completion Report
June 2008
Remediation of Soils and Dry Sediments at RVAAP 08-11 (LLs 1-4)
Page 2-3
environment during construction activities. Remediation activities performed in accordance with
the approved RAWP are discussed in further detail in Section 3.0.
2.3 POST-ROD CHANGES TO THE SELECTED REMEDY
Since the signing of the Final Interim ROD in July 2007 and implementation of field activities,
changes to the selected remedy have been initiated by USACE and the Base Realignment and
Closure Division (BRACD). These changes consist of eliminating two activities that were
contracted and to be performed by Shaw following the completion of the remedial action:
1. Post-construction groundwater monitoring
2. Concrete slab maintenance
2.3.1 Groundwater Monitoring
In addition to excavation and off-site disposal, the selected remedy in the Final Interim ROD
originally contained provisions for Shaw to perform groundwater monitoring for five years at
selected wells to monitor for potential impacts to groundwater from remedy implementation.
USACE intends to remove this task from Shaw’s scope of work and anticipates performing it
under the Facility-Wide Groundwater Monitoring Program (FWGWMP) or another contract.
Before this task was eliminated, baseline groundwater sampling was performed by Shaw prior to
construction activities and is discussed further in Section 3.2.
2.3.2 Concrete Slab Maintenance
The selected remedy requires periodic monitoring of the concrete slabs that remain in place to
ensure that the integrity of the slabs has not been compromised. The slabs provide adequate
barriers to prevent precipitation from infiltrating to impacted soils beneath. BRACD has already
contracted for removal of slabs and foundations at LL 2, 3, and 4. BRACD started slab and
foundation removal in March 2008. Removal of the slabs and foundation will eliminate the need
for routine maintenance as directed in the selected remedy.
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