a numerical study of barometric pumping
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A Numerical Study of Barometric Pumping. Jeff Sondrup AgE 588 Fluid Mechanics of Porous Materials April 11, 2001. Presentation Outline. Introduction Gas Transport & Barometric Pumping Model Description Model Results Conclusions. Subsurface Disposal Area, INEEL.

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a numerical study of barometric pumping

A Numerical Study of Barometric Pumping

Jeff Sondrup

AgE 588

Fluid Mechanics of Porous Materials

April 11, 2001

presentation outline
Presentation Outline
  • Introduction
  • Gas Transport & Barometric Pumping
  • Model Description
  • Model Results
  • Conclusions
voc background at the sda
VOC Background at the SDA
  • VOCs first discovered in GW near SDA in 1987
  • Soil gas survey confirmed SDA pits and trenches were a VOC source
  • Inventory search indicated sludges containing VOCs from Rocky Flats buried in SDA (1966-70)
  • Primarily carbon tetrachloride (CCl4) with TCE, PCE, and TCA
  • Vadose zone vapor sampling indicates a large plume
  • GW concentrations ND to slightly above MCL
  • Modeling estimates GW concentrations to peak decades in the future at several times MCL
  • ROD signed in 1994, Soil Vapor Extraction (SVE) preferred alternative
  • Five extraction wells began operating 1996, removed ~75,000 lbs TVOCs, ~48,000 lbs CCl4
gas transport mechanisms in the vadose zone
Gas Transport Mechanismsin the Vadose Zone
  • Advection (contaminants travel with the bulk movement of air)
    • Natural: water displacement, barometric pressure changes, density
    • Induced: drilling, soil vapor extraction (SVE)
  • Diffusion (random motion of molecules)
  • Sorption (contaminants adhere to the rock/soil)
  • Vapor-Liquid Partitioning (contaminants move into and out of air-water)
conclusions
Conclusions
  • Time step important when simulating BP
  • Square wave approximation is reasonable if pressure patterns predictable and repeatable
  • BP impact small but can be important
  • Impact is site and event specific (depends on contaminant, location, pressure patterns, subsurface)
  • Diffusion is the dominant mechanism
  • BP important for passive soil venting (gas extraction)
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