Moffett RAB Site 25 Update


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IR Site 25 update to the Moffett Restoration Advisory Board, March 10, 2011, by Bryce Bartelma, Navy Project Manager.

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Moffett RAB Site 25 Update

  1. 1. RAB Update - IR Site 25 March 10, 2011 ,Presenter: Bryce Bartelma, Navy Project Manager 1
  2. 2. IR Site 25IR Site 25 encompasses approximately 230 acres and was constructed for use as part of the Moffett Field stormwater 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. Pre- Pre-Design Investigation of Sediment• Conducted pre-design field work in November and December 2010: – Site reconnaissance to evaluate location and access points for Remedial Action, sensitive species, wetlands, and baseline conditions – Surveying – Light Detection and Ranging (LiDAR) with ground truth for a topographic survey – Collect sediment samples from the top 0.5 feet for chemical analysis and top 3 feet for physical analysis using handheld tools and equipment – Collect bulk soil samples for a laboratory treatability study 3
  4. 4. LiDAR Land SurveyLiDAR, which uses laser pulses and optical remote sensing, is a state-of-the-art surveying technique that was conducted by slowly driving around y g q y y gthe perimeter of IR Site 25. LiDAR is highly accurate and cost effective forlarge areas such as IR Site 25. Highly vegetated areas required standard“ground truth” surveying (with biological monitor observance). 4
  5. 5. Pre- Pre-Design Investigation of SedimentIR Site 25 stormwater typically evaporates completely during the Summermonths, which would’ve allowed for foot access to all sampling locations. , p g 5
  6. 6. Pre- Pre-Design Investigation of SedimentIncreased amount of rainfall throughout 2009 and 2010 did not allow IRSite 25 to fully evaporate, which required a unique sampling approach. y p , q q p g pp 6
  7. 7. Air BoatThe air boat is capable of moving across very shallow water (one inchdeep). Utility locators, surveyors, and sediment samplers were shuttled toeach location to complete the pre-design fieldwork . hl ti t l t th d i fi ld k 7
  8. 8. Air Boat Sample CollectionTwenty-eight (28) sediment samples were collected for chemical (PCBs,pesticides, lead and zinc) analysis (hand auger sample on left) andeighteen (18) sediment samples were collected for geotechnical analysis(undisturbed tube on right) to refine the remedial design. 8
  9. 9. Chemical Sample Locations 9
  10. 10. Physical Sample Locations 10
  11. 11. Treatability Study• In addition to the chemical and geotechnical samples, five (5) bulk soil samples were sent to a laboratory for a treatability study. Results of p y y y the study will be provided in the Pre-Design Completion Report and will recommend a reagent suitable to stabilize metals in soil.• Testing three (3) reagents: g ( ) g – Terra-Bond™ – EnviroBlend® – ECOBOND®• What does this all mean? If concentrations of lead in soil are g greater than or equal to 100 q mg/kg, that soil will be segregated into a separate stockpile for additional lab analysis and possible mixing with a stabilizing agent before disposal. 11
  12. 12. Site 25 Remedial Action Areas((Before Pre-Design Sampling) Pre- g p g) 12
  13. 13. Site 25 Remedial Action Areas ( (After Pre-Design Sampling) Pre- g p g)• Pre-design sampling Removed resulted in a >3 acre Added Polygon reduction in the overall Polygon areas requiring remedial action (total = 31.9 acres)• Sample results will be presented in a Completion Report and will also be incorporated into a Remedial Design/Remedial Action Work Plan (RD/RAWP)• The RD/RAWP will detail the excavation of sediment from areas above the remedial action objective, with field activities commencing in Summer/Fall 2011 13
  14. 14. Remedial Action Challenges• Rainfall/Discharge• Heavy Equipment Access• Recently Opened Portion of the Bay Trail• Special Species• Vegetation R V t ti Removal l 14
  15. 15. Questions? 15