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Hampton Bays

Hampton Bays. At least one UST release MTBE, TAME TBA degradation product Upper Glacial; Magothy Sensitive shallow saline surface water discharge IRM rate In-situ follow-up?. Critical Prediction.

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Hampton Bays

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  1. Hampton Bays • At least one UST release • MTBE, TAME • TBA degradation product • Upper Glacial; Magothy • Sensitive shallow saline surface water discharge • IRM rate • In-situ follow-up?

  2. Critical Prediction • Maximum MTBE concentration at Interim Remedial Measure well for number and sizing of Air Stripping Towers – • Limited space • Neighborhood • - Location pre-determined

  3. Hampton Bays Source Contamination first identified Shallow bay

  4. Characterization • Multi-level transects across plume • Typically 8 to 12 nested sampling/wl points • Oxygenates, BTEX, EAs • No full single sampling event yet • Typical representative sample: Volume: 100,000 c-ft (x porosity)* • Area: 300 sq-ft (x porosity) • Spacing: 40 ft * Long Island ‘Rule of Thumb: 50,000 to 100,000 c-ft

  5. Model Domain Source Source Contamination Shallow bay – constant head

  6. Plume Centerline

  7. Anthropogenic Recharge

  8. Gridded MTBE

  9. Modeled Pathline - XY

  10. Modeled Pathline - RZ

  11. IRM Recovery Well Highest Concentration along IRM ~ 10,000 ug/L

  12. IRM - Recovery • Predicted from mass-flux: • ~ 2,500 ug/L • Predicted from model: • ~ 2,500 ug/L • Actual: • ~ 6,300 ug/L • Dilution only 1.5:1? • OR • Extra Mass?

  13. New Well(s) Concentration 21,000

  14. Current Work • Examine maximum-concentrations that could exist in the plume centerline, consistent with measured data • Postulate XYZ locations of several points in plume centerline • Estimate values at points • Krig points onto existing starting concentrations until best match

  15. Salient Point Even at some of the most well characterized sites, there is detail that is not captured. A model calibrated to the data will always miss these details – but the possibilities can be investigated.

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