IR Site 25 update to the Moffett Restoration Advisory Board, March 10, 2011, by Bryce Bartelma, Navy Project Manager.

1. RAB Update - IR Site 25
March 10, 2011
,
Presenter: Bryce Bartelma, Navy Project Manager
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2. IR Site 25
IR Site 25 encompasses approximately 230 acres and was constructed for use
as part of the Moffett Field stormwater management system since 1953.
AOI-14
The Navy is coordinating remedial action activities with NASA as they
prepare to conduct their cleanup activities at Area of Investigation (AOI)-14
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3. Pre-
Pre-Design Investigation of Sediment
• Conducted pre-design field work in November and December 2010:
– Site reconnaissance to evaluate location and access points for Remedial
Action, sensitive species, wetlands, and baseline conditions
– Surveying – Light Detection and Ranging (LiDAR) with ground truth for a
topographic survey
– Collect sediment samples from the top 0.5 feet for chemical analysis and
top 3 feet for physical analysis using handheld tools and equipment
– Collect bulk soil samples for a laboratory treatability study
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4. LiDAR Land Survey
LiDAR, which uses laser pulses and optical remote sensing, is a state-of-
the-art surveying technique that was conducted by slowly driving around
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the perimeter of IR Site 25. LiDAR is highly accurate and cost effective for
large areas such as IR Site 25. Highly vegetated areas required standard
“ground truth” surveying (with biological monitor observance).
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5. Pre-
Pre-Design Investigation of Sediment
IR Site 25 stormwater typically evaporates completely during the Summer
months, which would’ve allowed for foot access to all sampling locations.
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6. Pre-
Pre-Design Investigation of Sediment
Increased amount of rainfall throughout 2009 and 2010 did not allow IR
Site 25 to fully evaporate, which required a unique sampling approach.
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7. Air Boat
The air boat is capable of moving across very shallow water (one inch
deep). Utility locators, surveyors, and sediment samplers were shuttled to
each location to complete the pre-design fieldwork .
hl ti t l t th d i fi ld k
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8. Air Boat Sample Collection
Twenty-eight (28) sediment samples were collected for chemical (PCBs,
pesticides, lead and zinc) analysis (hand auger sample on left) and
eighteen (18) sediment samples were collected for geotechnical analysis
(undisturbed tube on right) to refine the remedial design.
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9. Chemical Sample Locations
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10. Physical Sample Locations
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11. Treatability Study
• In addition to the chemical and geotechnical samples, five (5) bulk soil
samples were sent to a laboratory for a treatability study. Results of
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the study will be provided in the Pre-Design Completion Report and will
recommend a reagent suitable to stabilize metals in soil.
• Testing three (3) reagents:
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– Terra-Bond™
– EnviroBlend®
– ECOBOND®
• What does this all mean? If
concentrations of lead in soil are
g
greater than or equal to 100
q
mg/kg, that soil will be segregated
into a separate stockpile for
additional lab analysis and
possible mixing with a stabilizing
agent before disposal.
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12. Site 25 Remedial Action Areas
(
(Before Pre-Design Sampling)
Pre- g p g)
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13. Site 25 Remedial Action Areas
(
(After Pre-Design Sampling)
Pre- g p g)
• Pre-design sampling Removed
resulted in a >3 acre Added
Polygon
reduction in the overall Polygon
areas requiring remedial
action (total = 31.9 acres)
• Sample results will be
presented in a Completion
Report and will also be
incorporated into a
Remedial Design/Remedial
Action Work Plan
(RD/RAWP)
• The RD/RAWP will detail
the excavation of sediment
from areas above the
remedial action objective,
with field activities
commencing in
Summer/Fall 2011
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14. Remedial Action Challenges
• Rainfall/Discharge
• Heavy Equipment Access
• Recently Opened Portion of the Bay Trail
• Special Species
• Vegetation R
V t ti Removal l
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15. Questions?
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