Update on Site 25 stormwater retention pond clean-up by Bryce Bartelma at the August 9, 2012, meeting of the Moffett Restoration Advisory Board.

1. Former NAS Moffett Field
Site 25 Remedial Action Update
Bryce Bartelma, PG
Navy BRAC PMO West
August 9, 2012
RAB Meeting

2. IR Site 25
IR Site 25 encompasses approximately 230 acres and was constructed for use
as part of the Moffett Field storm water 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. Remedial Design and
Remedial Action Work Plan
• Final Remedial Design
and Remedial Action
Work Plan (RD/RAWP)
distributed on March 30
• Removal of over 32,500
cubic yards of sediment
from nearly 32 acres
• Planned excavation
depths of 0.5 – 1.5 feet
below ground surface
• Restore vegetated
areas with pickleweed
and other native grass
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4. April 2012 Conditions at IR Site 25
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5. Step 1: Temporarily Re-route
Storm Water & WATS effluent
Storm Water
Settling Vault
Catch Basin
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6. August 2012 Conditions at IR Site 25
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7. August 2012 Conditions at IR Site 25
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8. Step 2: Additional Water Management?
• No immediate plans to coffer dam the site if weather stays dry
• Water table just beneath ground surface
• Working with USFWS to potentially lower water table locally in
ponds adjacent to site
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9. Balancing the Water Table
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10. Biological Observations at Site 25
NESTING
• Alameda Song Sparrow
• Western Harrier
• Mockingbird, marsh wren, bushtit and
killdeer
OBSERVED
• Harvest Mice (unidentified subspecies)
• Deer Mice & Voles
• California Least Tern (in flight)
• Black Rail (vocalizing)
• Fox, jackrabbit, and gopher snake
NOT OBSERVED
• Western Pond Turtle (WPT)
• Western Snowy Plover
• California Clapper Rail 10

11. Biological Protection Measures
PROTECTION MEASURES
1. Visually inspect/clear vegetation
prior to removal
2. Hand remove pickleweed
3. Silt fencing along access points
and suitable habitat areas
4. Continuous biological
monitoring
5. Coordination with CDFG and
USFWS
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12. Sediment Excavations
• Planned excavation depths of 0.5 – 1.5
feet below ground surface
• Field verification for dig depth
• Grid confirmation sampling
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13. Vegetation Restoration
• All vegetation areas removed
during Remedial Action will be Pickleweed
restored (excludes EDM and Salicornia
inundated mud flats) virginica
• Two main types of vegetation
• Minimum of two years monitoring
and maintenance
Saltgrass
• Options for irrigation services and Distichlis
additional plantings spicata
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14. Schedule
• Vegetation Removal Prep
Nearing Completion
• Biological Surveys and
Sediment Excavations
Ongoing
• Vegetation Restoration
Fall 2012
• Submit Remedial Action
Completion Report
Spring 2013
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15. Questions?
Point of Contact:
Scott Anderson
BRAC Environmental Coordinator
(619) 532-0938
scott.d.anderson@navy.mil
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