Moffett RAB Site 25 Update


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

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Moffett RAB Site 25 Update

  1. 1. Former NAS Moffett FieldSite 25 Remedial Action Update Bryce Bartelma, PG Navy BRAC PMO West August 9, 2012 RAB Meeting
  2. 2. IR Site 25IR 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 2
  3. 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 3
  4. 4. April 2012 Conditions at IR Site 25 4
  5. 5. Step 1: Temporarily Re-routeStorm Water & WATS effluent Storm Water Settling Vault Catch Basin 5
  6. 6. August 2012 Conditions at IR Site 25 6
  7. 7. August 2012 Conditions at IR Site 25 7
  8. 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 8
  9. 9. Balancing the Water Table 9
  10. 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. 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 11
  12. 12. Sediment Excavations • Planned excavation depths of 0.5 – 1.5 feet below ground surface • Field verification for dig depth • Grid confirmation sampling 12
  13. 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 13
  14. 14. Schedule• Vegetation Removal Prep Nearing Completion• Biological Surveys and Sediment Excavations Ongoing• Vegetation Restoration Fall 2012• Submit Remedial Action Completion Report Spring 2013 14
  15. 15. Questions? Point of Contact: Scott Anderson BRAC Environmental Coordinator (619) 532-0938 15