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Former NAS Moffett Field
Site 25 Remedial Action Update
Bryce Bartelma, PG
Navy BRAC PMO West
May 10, 2012
RAB Meeting
IR Site 25
IR Site 25 encompasses approximately 230 acres and was constructed for useas part of the Moffett Field storm water management system since 1953
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The Navy is coordinating remedial action activities with NASA as theyprepare to conduct their cleanup activities at Area of Investigation (AOI)-14
AOI-14
Remedial Design andRemedial Action Work Plan
• Final Remedial Designand Remedial ActionWork Plan (RD/RAWP)distributed on March 30
• Removal of over 32,500cubic yards of sedimentfrom nearly 32 acres
• Planned excavationdepths of 0.5 – 1.5 feetbelow ground surface
• Restore vegetatedareas with pickleweedand other native grass
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2011 Conditions at IR Site 25
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2012 Conditions at IR Site 25
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Step 1: Temporarily Re-routeStorm Water & WATS effluent
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Catch Basin
Storm WaterSettling Vault
Step 2: Internal Water Management
• Cofferdam to isolate polygons requiring remediation
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• Phased approach tomanage water
• Field changes based onactual water volumesand/or sensitive habitat
Biological Considerations at Site 25
ENDANGERED SPECIES
• Salt Marsh Harvest Mouse (SMHM)
• California Clapper Rail
• Western Snowy Plover
• California Least Tern
• California Seablight (plant)
STATE SPECIES OF CONCERN
• Western Pond Turtle (WPT)
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SMHM Biological Protection Measures
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PROTECTION MEASURES
1. Visually inspect/clear vegetationprior to removal
2. Hand remove pickleweed
3. Silt fencing along access pointsand suitable habitat areas
4. Continuous biologicalmonitoring
5. Coordination with CDFG andUSFWS
Thanks for cleaningup the neighborhood!
Avian Biological Protection Measures
• Completed presence/absencesurveys (no endangeredspecies observed)
• Ongoing and continuousmonitoring for sightings and/ornesting
• Provide buffers and make fieldschedule changes (if observed)
• Continued coordination withCDFG and USFWS
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WPTs at Eastern Diked Marsh?
• Minimal standing water at EasternDiked Marsh diminishes presence
• California Department of Fish &Game (CDFG) requests trapping &visual surveys
• Two types of trapping:
– Basking traps
– Hoop traps
• Trapping with qualified WPTbiologists
• Observations (and potentialrelocations) will be coordinatedwith CDFG
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Vegetation Restoration
Pickleweed
Salicornia
virginica
Saltgrass
Distichlis
spicata
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• All vegetation removed duringRemedial Action will be restored(excludes EDM and inundatedmud flats)
• Two main types of plantings(potential addition of nativehydroseed blend, if deemedappropriate by ecologist)
• Minimum of two years monitoringand maintenance
• Options for irrigation services andadditional plantings
Schedule
• Site Reconnaissance andMobilization Preparation
In Progress
• Biological Surveys and WasteCharacterization Sampling
Ongoing
• Water Management
Spring 2012
• Remedial Action Fieldworkand Vegetation Restoration
Summer & Fall 2012
• Submit Remedial ActionCompletion Report
Spring 2013
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Questions?
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