FINAL SAMPLING AND ANALYSIS PLAN - Documents for Moffett Field

structure. Aroclor-1260 was detected in the structural steel paint coating at concentrations
up to 120 mg/kg, and Aroclor-1268 was detected at concentrations up to 94 mg/kg. Total
PCBs were detected in the paint at concentrations ranging from 65 to 214 mg/kg. Paint
coatings of similar appearance that appear to be present on redwood ceiling and catwalk
planks were not analyzed but are assumed to contain similar concentrations of PCBs.
In addition to PCBs, lead was detected in paint that currently covers the hangar siding,
doors and steel support structure, at maximum detected concentrations of 200,000 mg/kg
(20%). Asbestos was also detected in building materials, including siding panels, roofing,
and other surface materials. The PCB-containing building materials are considered the
most likely source of the PCBs reported in sediment in the storm water collection trench
around the perimeter of Hangar 1.
NASA and the Navy completed Time-Critical Removal Actions (TCRAs) at Hangar 1 as
interim measures to address potential threats to human health and the environment
associated with elevated concentrations of PCBs in Hangar 1 building materials and the
adjacent storm water management system.
In 2008, an Engineering Evaluation/Cost Analysis (EE/CA) was prepared to evaluate PCB
removal alternatives. Alternative 10, removal siding and coating of exposed surfaces, was
selected as the preferred approach as documented in the Action Memorandum (Navy
2008).
This removal action will be conducted to address human health and environmental
concerns associated with potential exposure pathways, including the surface water runoff
pathway to storm water management system, through controlling the migration of PCBs
from Hangar 1 to the environment. The Removal Action Objective is to control the release
of contaminants at Hangar 1, thereby reducing the potential risks to human health and the
environment while minimizing future operation and maintenance activities at the site.
It should also be noted that this removal action is not addressing 1) potential releases to
groundwater, because data previously collected indicates there have been no impacts to
groundwater from PCBs, lead or asbestos; 2) contamination in or below the concrete
foundation, because the foundation will be left in place and there are no indications that it
is contaminated; or 3) institutional controls, because they are outside the scope of this
NTCRA.
To verify that the removal is executed without the release of PCBs into the environment as
a result of the removal action, soil samples from areas adjacent to Hangar 1, sediment
samples from storm drain system, and wipe sample from the concrete floor inside the
hangar will be collected as pre- and post-removal samples.
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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