Overview of nibw site history and current status
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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 work
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


Components of rod required remedy
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


Voluntary components of the enhanced remedy
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




Overview of nibw site history and current status

UAU

TCE CONCENTRATION

CONTOURS

APRIL 1998


Overview of nibw site history and current status

UPPER MAU

TCE CONCENTRATION

CONTOURS

APRIL 1998


Overview of nibw site history and current status

LOWER MAU

TCE CONCENTRATION

CONTOURS

APRIL 1998


Overview of nibw site history and current status

LAU

TCE CONCENTRATION

CONTOURS

1990


Overview of nibw site history and current status

LAU

TCE CONCENTRATION

CONTOURS

1992


Overview of nibw site history and current status

LAU

TCE CONCENTRATION

CONTOURS

1994


Overview of nibw site history and current status

LAU

TCE CONCENTRATION

CONTOURS

1996


Overview of nibw site history and current status

LAU

TCE CONCENTRATION

CONTOURS

APRIL 1998



Overview of nibw site history and current status

AREA 12

SVE

PROGRAM


Overview of nibw site history and current status

EXTRACTION WELL MEX-1MA

MCDOWELL ROAD

GRANITE REEF WELL

HAYDEN ROAD

L

GRANITE REEF ROAD

TREATMENT SYSTEM

ROOSEVELT ROAD

MAU GROUNDWATER EXTRACTION

AND TREATMENT


Overview of nibw site history and current status

PROJECTED

HYDRAULIC

CAPTURE

1,000 gpm


Overview of nibw site history and current status

PROJECTED

HYDRAULIC

CAPTURE

1,850 gpm



Overview of nibw site history and current status

UPPER MAU

WATER LEVEL

CONTOURS

APRIL 1998




Overview of nibw site history and current status

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


Overview of nibw site history and current status

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


Overview of nibw site history and current status

TCE CONCENTRATIONS AT MONITOR WELL PA-5LA 1997, AFTER IMPLEMENTATION OF EXTRACTION


Overview of nibw site history and current status

EXTRACTION WELL PCX-1 1997, AFTER IMPLEMENTATION OF EXTRACTION

INSTALLATION


Overview of nibw site history and current status

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


Overview of nibw site history and current status

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


Fsa groundwater flow and contaminant transport model

FSA Groundwater Flow and Contaminant Transport Model 1998, AFTER IMPLEMENTATION OF EXTRACTION


Purpose
Purpose 1998, AFTER IMPLEMENTATION OF EXTRACTION

  • 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)


Tasks
Tasks 1998, AFTER IMPLEMENTATION OF EXTRACTION

  • Compare ROD Required and Enhanced Remedial Alternatives

  • Simulate range of potential additional Remedial Actions

  • Simulate combinations of Remedial Actions comprising potential Remedial Alternatives


Overview of nibw site history and current status

GENERAL HEAD BOUNDARY 1998, AFTER IMPLEMENTATION OF EXTRACTION

FSA

MODEL

DOMAIN

AND

BOUNDARIES

(66 sq. mi.)

NO FLOW BOUNDARY

NO FLOW BOUNDARY

GENERAL HEAD

BOUNDARY


Overview of nibw site history and current status

ROD 1998, AFTER IMPLEMENTATION OF EXTRACTION

Enhanced