site 25 update to moffett rab may 10, 2012
TRANSCRIPT
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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
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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
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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
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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
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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!
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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
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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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