FINAL SAMPLING AND ANALYSIS PLAN - Documents for Moffett Field

Process
Step 3
Identify
information
inputs
Step 4
Define the study
boundaries
Table 11-1. Data Quality Objectives Summary
Pre-Construction and Confirmation Sampling
Response
construction samples to verify that contaminants were not released to the
environment?
5. Are the results of PCBs, metals, semi-volatile organic compounds (SVOCs),
polyaromatic hydrocarbons (PAHs), total petroleum hydrocarbons (TPHs),
asbestos and pH in imported soil (clean fill) samples within the regulatory limits
listed in Worksheet 15?
Baseline/pre-construction concentrations of PCBs, lead, and asbestos will be established
from pre-construction samples collected from the soil areas adjacent to Hangar 1 and the
sediment in the stormwater trench/conveyance system surrounding the building.
Samples will be collected from the soil after the removal action and analyzed for PCBs,
lead, and asbestos. If sediment is present in the stormwater trench/conveyance system,
post-removal samples will be collected and analyzed for PCBs, lead, and asbestos.
Concrete wipe samples will be collected from the floor of Hangar 1 and analyzed for
PCBs and lead. Soil to be imported to use as backfill, if excavation is necessary, will be
sampled and analyzed for TPHs, PAHs, SVOCs, PCBs, asbestos, metals and pH.
The proposed soil sample locations are presented in Figure 11-1 and the interior
concrete floor samples are presented in Figure 11-2. Soil samples will be collected from
the soil areas immediately adjacent to Hangar 1. Concrete wipe samples will be collected
from the floor of Hangar 1, within its interior boundaries.
Sediment samples will be collected from the sediment inside the stormwater
trench/conveyance system. Sample locations will be determined based on where there is
a sufficient amount of sediment present for sample collection.
Field activities are anticipated to begin in June 2010 and end in August 2011. Preconstruction
samples will be collected before removal activities begin. Confirmation
samples will be collected after removal and decontamination activities have been
completed.
1. If the concentrations of PCBs in baseline/pre-construction soil sample exceeds
the regulatory limit listed in Worksheet 15, then the surrounding contaminated
soil will be removed half way to the next clean sample location, and confirmation
samples will be collected from the bottom center and on all four sides of the
excavation until the result of the confirmation sample indicates that the
concentration of total PCB in soil is below 1000 µg/kg. The Navy will consult
with the EPA and Water Board for concurrence on areas requiring soil removal..
Step 5
Develop the
analytic approach
If the concentration of PCBs in baseline/pre-construction or confirmation
samples are below the regulatory limit listed in Worksheet 15, then soil removal
will not be required.
2. If the concentrations of lead and asbestos in post-construction confirmation soil
samples are at or below the levels reported in baseline/pre-construction sample,
then contaminants were not released to the environment from the removal
action of Hangar 1 and no soil removal is required.
If concentrations of lead and asbestos in post-construction confirmation samples
are greater than baseline samples, results will be provided to EPA and Water
Board for consultation to determine the appropriate response action.
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
Page 11-2