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 3-22
discussed in the RAWP (Shaw 2007b). Shaw’s intrusive activities continued past the normal
growing season for the required seed mixtures; however, Shaw applied the seed mixtures for the
completed areas as best possible. Only native species as identified in the INRMP were applied.
At a minimum, annual rye was placed to provide a quick temporary cover at the restored areas.
The annual rye was mixed with other more permanent species to provide long-term cover once
the annual rye died off. No non-natives species were introduced. Since most of the excavation
areas have not yet re-established vegetation, Shaw has maintained E&S controls consisting of silt
fence and diversion barriers for rainwater run-on. Areas where the seed was applied were
covered with a minimum of three bales of straw per every 1,000 ft 2 of disturbed area.
3.8.2 Borrow Source Material
Prior to bringing the material to the RVAAP, Shaw collected a borrow source sample at the exact
location at the source where the soils were to be taken from. The sample was submitted to
Kemron for the full suite of analytical parameters that included VOCs, SVOCs,
herbicides/pesticides, PCBs, inorganics/mercury, and pH. Analytical results indicated all results
were either non-detect or below the applicable background concentrations with the exception of
arsenic at 17.8 mg/kg. This concentration was below the applicable cleanup goal of 31 mg/kg
for arsenic and Ohio EPA concurred that the metal concentration was naturally occurring.
Shaw collected an additional sample prior to the 5,000 cubic yard interval of material to be
brought on-site from the Route 5 Sand & Gravel source. The sample was again submitted to
Kemron for the full suite of analytical parameters as for the initial sample. All results for this
second sample were either non-detect or below the applicable background concentrations,
consistent with the initial sample from the backfill source.
In all, a total of 9,772 tons (approximately 7,000 cubic yards) of borrow source material was
brought on-site from Route 5 Sand & Gravel. Shaw regularly inspected the condition of the soils
that were brought on-site to ensure the material was free of debris, large stones or leaching water.
A summary of analytical results for the borrow source material are presented in the data tables
(Table B-4) in Appendix B. The laboratory reports and associated data evaluation reports are
presented in Appendix G included as an electronic attachment to this RACR.
3.9 COORDINATION WITH BRAC DEMOLITION CONTRACTOR
Shaw’s work was performed concurrently with the demolition of the remaining buildings at LLs
2-4. Shaw coordinated its activities with PIKA, the BRAC demolition contractor, to minimize
potential disturbance to the proposed remediation areas by the demolition activities prior to
excavation. Minor schedule interruptions associated with the demolition activities were
encountered by Shaw due to limited access to the various load lines during demolition and delays
in debris removal, in particular LL 4. It is expected that proposed future BRAC demolition
activities of the remaining building slabs and foundations will disturb the areas previously
backfilled and seeded by Shaw, and restoration of these areas following the demolition activities
will be addressed by the Army.
*** FINAL***