FINAL SAMPLING AND ANALYSIS PLAN - Documents for Moffett Field

The Engineering Evaluation/Cost Analysis (EE/CA), finalized in July 2008, identified PCBs
as the chemicals of concern and stated that the release of the PCBs needed to be controlled.
In December 2008, the Action Memorandum for the Non-Time-Critical Removal Action
(NTCRA) for the PCB Contamination at Hangar 1 was completed. The Action
Memorandum selected Alternative 10, the removal of the Hangar 1 siding and application of
a coating to the exposed surfaces, as the preferred removal action. Although PCBs are the
regulatory driver for this NTCRA, the presence of lead and asbestos in the exterior and
interior building materials of Hangar 1 will require abatement and disposal compliance, as
well as additional health and safety precautions.
To verify that the removal is executed without the release of PCBs into the environment as a
result of the removal action, soil and sediment samples will be collected to establish baseline
concentrations of PCBs, lead, and asbestos. Baseline/pre-construction samples will be
collected from the soil areas immediately adjacent to Hangar 1 and from any sediment that
may be present in the stormwater trench/conveyance system. The baseline/pre-construction
soil samples will also indicate if soil excavation will be necessary to remove soil where the
PCB concentrations exceed project action limits of 1000 micrograms per kilogram (µg/kg).
Following the removal activities, samples will be collected from the previously sampled soil
areas adjacent to Hangar 1 and from locations on the interior concrete floor of Hangar 1.
Soil samples will be analyzed for PCBs, lead, and asbestos. Post-construction confirmation
soil sample concentrations will be compared with the baseline/pre-construction soil sample
concentrations to verify that contaminants were not released into the environment as a result
of the removal action, and to ensure PCBs are below 1000 µg/kg. Concrete wipe samples
will be collected from the interior concrete floor and analyzed for PCBs and lead to confirm
that concentrations are below the regulatory limits. Sediment will be removed (washed)
from the stormwater trench/conveyance system as part of the removal action, therefore; it is
anticipated that there will not be sediment to sample during the confirmation sampling
event.
Waste streams generated during the removal action will be characterized and sent to the
proper disposal facility. Spent water generated and collected during the removal action will
be treated on site. Pending analytical results and verification that analytical results are below
discharge criteria, the treated spent wash water will be discharged to the Sunnyvale Publicly
Owned Treatment Works (POTW) via the NASA/Ames Sanitary Sewer system.
Final Sampling and Analysis Plan
Installation Restoration Site 29, Hangar 1
Former Naval Air Station, Moffett Field, Moffett Field, California
DCN: AMEC-8816-0005-0039
April 2010
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