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

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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 2

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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

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April 2012 Conditions at IR Site 25 4

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Step 1: Temporarily Re-route Storm Water & WATS effluent Storm Water Settling Vault Catch Basin 5

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August 2012 Conditions at IR Site 25 6

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August 2012 Conditions at IR Site 25 7

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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

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Balancing the Water Table 9

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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

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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

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Sediment Excavations • Planned excavation depths of 0.5 – 1.5 feet below ground surface • Field verification for dig depth • Grid confirmation sampling 12

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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

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Schedule • Vegetation Removal Prep Nearing Completion • Biological Surveys and Sediment Excavations Ongoing • Vegetation Restoration Fall 2012 • Submit Remedial Action Completion Report Spring 2013 14

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Questions? Point of Contact: Scott Anderson BRAC Environmental Coordinator (619) 532-0938 scott.d.anderson@navy.mil 15

More Related Content

Moffett RAB Site 25 Update

  • 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 2
  • 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. April 2012 Conditions at IR Site 25 4
  • 5. Step 1: Temporarily Re-route Storm Water & WATS effluent Storm Water Settling Vault Catch Basin 5
  • 6. August 2012 Conditions at IR Site 25 6
  • 7. August 2012 Conditions at IR Site 25 7
  • 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
  • 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 11
  • 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. 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. 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. Questions? Point of Contact: Scott Anderson BRAC Environmental Coordinator (619) 532-0938 scott.d.anderson@navy.mil 15