OPHA Supplemental Site Investigation for Groundwater

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Presentation to the Moffett Restoration Advisory Board November 18, 2010: Former Orion Park Housing Area (OPHA) Supplemental Site Investigation for Groundwater

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OPHA Supplemental Site Investigation for Groundwater

  1. 1. FORMER ORION PARK HOUSING AREA (OPHA)AREA (OPHA) SUPPLEMENTAL SITE INVESTIGATION FOR GROUNDWATER Restoration Advisory Board Project Update November 18, 2010
  2. 2. Former OPHA Site
  3. 3. Site Use
  4. 4. A1 – TrichloretheneTrichlorethene (TCE) Plume in Upper (A1) ZoneZone
  5. 5. A2 –TCEA2 TCE Plume in Lower A2 Zone
  6. 6. Supplemental Site Investigation (SSI)pp g ( )  Problem - TCE in upper (A1) zone & lower (A2) zones ofpp ( ) ( ) unconfined aquifer  Purpose – Assess whether an on-site source of TCE is present at f O i P k Aformer Orion Park Area  Focus on 9 locations of concern (LOCs) for TCE  5 LOCs in AI zone  4 LOCs in A2 zone  Drill cone penetrometer/membane interface probes (MIP) at 28 to 50 locations  Then, push probes for grab groundwater samples at 0 to 18 locations (based on MIP results), analyze for TCE  Install 0 to 9 groundwater wells at sources, if any
  7. 7. Investigation Areas in Upper (A1) and Lower (A2) Zones(A2) Zones Investigation A i UArea in Upper A1 Zone Investigationg in Lower A2 Zone
  8. 8. 5 Locations of Concern (LOCs) – Upper A1 Zonepp
  9. 9. 4 Locations of Concern (LOCs) – Lower A2 Zone
  10. 10. Membrane Interface Probe (MIP)  MIP Responsep  20 readings/foot or 0.05- foot increments  P fil VOC t ti i Profiles VOC concentrations in unsaturated & saturated zones  Instantaneous data outputs  Combined with cone penetrometer test (CPT)penetrometer test (CPT) sensors - records lithology
  11. 11. Membane Interface Probe (MIP) – I tImprovements  Hardware  Software Improvements Hardware Improvements  Improved sensor loop  Software Improvements  Better correlation of readings with CPT and MIP profilingp p inside probe  Better gas  Direct feed into Geographic Information System (mapping ) d lchomatographs  Follow standard- ti d program) and Environmental Visualization Software (EVS) (Geology and Groundwateroperating procedures (Geology and Groundwater modeling tool) for interpretation
  12. 12. Example - MIP Profile Indicates Source? - YES Discrete Sample ResultsMIP Logs CPT Logs TCE 1,1-DCE Depth Discrete Sample ResultsMIP Logs Capillary fringe MIP log legend Baseline (variable) 5.0 e +5 1.0 e +6 5.0 e +6 Maximum response at 10.45 feet 5.0 e 6
  13. 13. Example - MIP Profile Indicates Source? – No (Plume) TCE 1,1-DCE Depth Discrete Sample Results Capillary fringe MIP log legend Baseline (variable) 5.0 e +5 1.0 e +6 5.0 e +6Initial response at water table Maximum response at 26.45 feet p
  14. 14. SSI Schedule Phase Description Dates Investigation, Phase 1 Water Level Measurement & Monitoring Well Sampling November 2010 Investigation SSI Investigation (CPT/MIP), January & February 2011Investigation, Phases 2 ,3 & 4 SSI Investigation (CPT/MIP), Direct-push Investigation, Monitoring Well Installation/Development & Sampling January & February 2011 Investigation, Phase 5 Investigation –Derived Waste Management, Laboratory Analysis February - June, 2011 Reporting Draft Report for review May 2011 dmy4
  15. 15. Slide 14 dmy4 put in table dayna.yocum, 11/15/2010
  16. 16. OPHA Project Team Contactsj  US Army – Guy Romine – (443) 567-1772 US Army Guy Romine (443) 567 1772  US Army Corps of Engineers – Cynthia Burris (916) 557-6745557 6745  US EPA – Alana Lee – (415) 972-3141  Regional Water Quality Control Board Elizabeth Regional Water Quality Control Board – Elizabeth Wells (510) 622-2440
  17. 17. Questions

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