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

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Remedial Action Completion Report June 2008 Remediation of Soils and Dry Sediments at RVAAP 08-11 (LLs 1-4) Page 2-2 exceeding clean-up goals (Shaw 2007a). The clean-up goals implemented for the remediation of soils and dry sediment at LLs 1-4 as presented in the Interim ROD are included in Table 2-1. . Table 2-1 COCs and Cleanup Goals for Soils and Dry Sediments at LLs 1-4 COC Cleanup Goal (mg/kg) Inorganics Aluminum 34,942 Antimony 2,458 Arsenic 31 Barium 3,483 Cadmium 109 Chromium, hexavalent 16 Manganese (surface soils a ) 1,800 Manganese (subsurface soils b ) 3,030 Lead Explosives 1,995 2,4,6-TNT 1,646 RDX PCBs 838 Aroclor-1254 SVOCs 35 Benz(a)anthracene 105 Benzo(a)pyrene 10 Benzo(b)fluoranthene 105 Dibenz(a,h)anthracene 10 Notes: COC – Chemical of Concern mg/kg – milligram per kilogram PCB – Polychlorinated biphenyl SVOCs – Semi-volatile organic compound TNT – Trinitrotoluene RDX - Cyclonite a Surface soil interval is from 0 to 1 foot below ground surface b Subsurface soil interval is greater than 1 foot below ground surface 2.2 SUMMARY OF REMEDIAL ACTION WORK PLAN As required per the CERCLA process, Shaw prepared a Remedial Action Work Plan (RAWP) (Shaw 2007b) which presents the “means and methods” for executing the selected remedy in accordance with the Final Interim ROD. The RAWP was reviewed and approved by USACE, Ohio EPA, and the RVAAP prior to field implementation and outlines the construction methodologies for excavation, contamination control, and protection of the public and the *** FINAL***
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. *** FINAL***
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