FINAL SAMPLING AND ANALYSIS PLAN - Documents for Moffett Field

• Excavation and Disposal of Contaminated Soil: Upon Navy approval, the PCB
contaminated soil will be removed with a loader and place it in roll-off bins for
transportation to the selected disposal facility. Confirmation samples will be
collected after the excavation until the concentrations for total PCB in soil is below
1000 µg/kg. For areas where concentrations of total PCB in baseline/preconstruction
samples exceed 1000 µg/kg, post-construction confirmation samples
for asbestos and lead will be collected after PCB contaminated soil has been
removed. The excavation will be backfilled with imported clean fill and compacted.
The clean fill will be analyzed for PCBs, SVOCs, TPHs, PAHs, metals, asbestos,
and pH.
• The stormwater trench/conveyance system will be cleaned out and pressure washed
as part of the scope of work, therefore; it is unlikely that sediment will be present to
sample for comparison purposes with pre-construction samples. Thirty-seven wipe
samples will be collected from the concrete floor of Hangar 1 and analyzed for
PCBs and lead. If the PCB and lead concentrations are within the regulatory limits
of 10 µg/100 square centimeter (cm 2 ), and 40 micrograms per square foot (µg/ft 2 ),
respectively, then cleanup will be deemed complete in this area. If either PCB or
lead concentrations are not within the regulatory limits then additional pressure
washing will be conducted, followed by additional wipe sampling until complete
cleanup is demonstrated.
• Airfield Beacon and Obstruction Lights, Decontamination, Site Cleanup, and
Demobilization: AMEC will comply with FAA requirements for maintenance and
final placement of the beacon and obstruction lights on top of the hangar.
• Waste water generated during the NTCRA will be stored and treated on site prior to
disposal or re-use. Treated water will be sampled every 120,000 gallons analyzed
for PCBs, chromium, zinc, lead, asbestos, and pH, as required by the Sunnyvale
POTW discharge permit. Treated water will be re-used for construction purposes
when analyses indicate that water does not contain contaminants above federal,
state and local concentration limits.
14.2 Sampling Procedures
14.2.1 Pre-construction/Baseline Soil Sampling Procedure
The following is the soil sampling procedure for pre-construction samples:
1. Don a new pair of nitrile gloves.
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 14-3