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Overview of NIBW Site History and Current Status

Overview of NIBW Site History and Current Status. NIBW Site Visit June 21, 1999. Overview of NIBW Site History. Overview of Work. Comprehensive site characterization Summary of Site conditions in RI/FS Implementation of ROD-required Remedy Capture and containment not achieved

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Overview of NIBW Site History and Current Status

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  1. Overview of NIBW Site History and Current Status NIBW Site Visit June 21, 1999

  2. Overview of NIBW Site History

  3. Overview of Work • Comprehensive site characterization • Summary of Site conditions in RI/FS • Implementation of ROD-required Remedy • Capture and containment not achieved • Implementation of Enhanced Remedy • Capture and containment projected • Preparation of FSA • Documentation of effectiveness of Enhanced Remedy

  4. Components of ROD-Required Remedy • MAU & LAU extraction at wells COS31, COS71, COS72, and COS75 • Monitoring of UAU mass flux • Soil vapor extraction at Areas 7, 8, and 12

  5. Voluntary Components of the Enhanced Remedy • COS6 tie-in to the CGTF (MAU/LAU) • Replacement LAU extraction at well COS75A • LAU extraction at well PCX-1 • MRTF for treatment of groundwater from PCX-1, and PVWC#15 and #14 • UAU extraction at Area 7 • MAU extraction at Areas 7 and 12

  6. Hydrogeology Overview

  7. SCHEMATIC OF SOUTHWEST MARGIN HYDROGEOLOGY

  8. UAU TCE CONCENTRATION CONTOURS APRIL 1998

  9. UPPER MAU TCE CONCENTRATION CONTOURS APRIL 1998

  10. LOWER MAU TCE CONCENTRATION CONTOURS APRIL 1998

  11. LAU TCE CONCENTRATION CONTOURS 1990

  12. LAU TCE CONCENTRATION CONTOURS 1992

  13. LAU TCE CONCENTRATION CONTOURS 1994

  14. LAU TCE CONCENTRATION CONTOURS 1996

  15. LAU TCE CONCENTRATION CONTOURS APRIL 1998

  16. Area 12 Remedial Actions

  17. AREA 12 SVE PROGRAM

  18. EXTRACTION WELL MEX-1MA MCDOWELL ROAD GRANITE REEF WELL HAYDEN ROAD L GRANITE REEF ROAD TREATMENT SYSTEM ROOSEVELT ROAD MAU GROUNDWATER EXTRACTION AND TREATMENT

  19. PROJECTED HYDRAULIC CAPTURE 1,000 gpm

  20. PROJECTED HYDRAULIC CAPTURE 1,850 gpm

  21. Performance/Effectiveness Evaluation for MAU Groundwater

  22. UPPER MAU WATER LEVEL CONTOURS APRIL 1998

  23. Performance/Effectiveness Evaluation for LAU Groundwater

  24. EXTRACTION WELL COS75A INSTALLATION

  25. ESTIMATED WATER LEVEL ALTITUDE IN VICINITY OF COS75A, APRIL 1995, PRIOR TO IMPLEMENTATION OF EXTRACTION

  26. ESTIMATED WATER LEVEL ALTITUDE IN VICINITY OF COS75A, APRIL 1997, AFTER IMPLEMENTATION OF EXTRACTION

  27. TCE CONCENTRATIONS AT MONITOR WELL PA-5LA

  28. EXTRACTION WELL PCX-1 INSTALLATION

  29. ESTIMATED WATER LEVEL ALTITUDE IN VICINITY OF PCX-1, APRIL 1997, PRIOR TO IMPLEMENTATION OF EXTRACTION

  30. ESTIMATED WATER LEVEL ALTITUDE IN VICINITY OF PCX-1, APRIL 1998, AFTER IMPLEMENTATION OF EXTRACTION

  31. FSA Groundwater Flow and Contaminant Transport Model

  32. Purpose • Predictive tool for evaluating a range of remedial actions with respect to: • Capture and containment of the zones of contamination (flow model) • Relative clean-up time (transport model)

  33. Tasks • Compare ROD Required and Enhanced Remedial Alternatives • Simulate range of potential additional Remedial Actions • Simulate combinations of Remedial Actions comprising potential Remedial Alternatives

  34. GENERAL HEAD BOUNDARY FSA MODEL DOMAIN AND BOUNDARIES (66 sq. mi.) NO FLOW BOUNDARY NO FLOW BOUNDARY GENERAL HEAD BOUNDARY

  35. ROD Enhanced

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