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Determination of the Radius of Influence for Chemical Treatment in an Unconfined Aquifer

Determination of the Radius of Influence for Chemical Treatment in an Unconfined Aquifer. www. terra -env-corp.com. HAMMOND LAKE COUNTY INDIANA. Site Fine Sand Unconfined Aquifer Lower Confining Unit Petroleum Impacts Gasoline. Groundwater Flow Gradient .02 Flow E-NE K=25 ft/day.

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Determination of the Radius of Influence for Chemical Treatment in an Unconfined Aquifer

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  1. Determination of the Radius of Influence for Chemical Treatment in an Unconfined Aquifer www.terra-env-corp.com

  2. HAMMOND LAKE COUNTY INDIANA

  3. Site • Fine Sand • Unconfined Aquifer • Lower Confining Unit • Petroleum Impacts • Gasoline

  4. Groundwater Flow • Gradient .02 • Flow E-NE • K=25 ft/day

  5. Cross Section A-A’ • Smear Zone • Utilities

  6. Pre-Treatment Groundwater Plume

  7. Pilot Test

  8. Pilot Test • Injection Test • 200 Gallons @ 2gpm • Three Observation Wells • Low Pressure • Double Diaphragm Pump

  9. Pilot Test Results • Radius of Impact >15 feet • Injection Pressure <10 psi • Rate 2gpm

  10. Treatment Design • RegenOx • 45 points • 48lbs (oxidant) • 94 gallons per point • Two Treatments • ORC-A

  11. Implementation • August and September 2012 • 5 days per round x 2 • 2,160 lbs RegenOx • 4,230 gallons • ORC-A • 16.4 lbs/point

  12. Water Elevation Monitoring • During Injection • Water Level Response

  13. Water Elevation Monitoring • During Injection • Water Level Response

  14. Radial Pressure Response • Observed > 40ft • Related to K

  15. Groundwater Stability Monitoring • D.O. • pH • Temp • ORP • TDS

  16. Groundwater Stability Monitoring • D.O. • pH • Temp • ORP • TDS

  17. Pre-Treatment • Groundwater Plume • Stable

  18. Post Treatment Groundwater Plume • Perimeter Treatment • Source Treatment

  19. AnalyticalResultsPerimeter Well

  20. AnalyticalResultsSource Well

  21. Pre-Treatment Soil Plume

  22. Post Treatment Soil Plume

  23. Problems • Application performed during low water level period • Application period driven by regulatory agency instead of site conditions • Application design does not consider contaminant concentration distribution

  24. Solution Smear Zone

  25. Solution • Treatment at High Water Table • 90 percent efficiency

  26. Problem • Application performed during low water level period • Application period driven by regulatory agency instead of site conditions • Application design does not consider contaminant concentrations

  27. Solution Remedial Work Plan • Include Water Level Monitoring Design • Evaluate Smear Zone • Determine Seasonal Fluctuations

  28. Solution Continuous Water Level Monitoring

  29. Problem • Application performed during low water level period • Application period driven by regulatory agency instead of site conditions • Application design does not consider contaminant concentration distribution

  30. Solution Treatment Design Based on Distribution Of Contaminant

  31. Conclusions • Application should be performed based on high water level data for the site • High water level results in better pore contact with the source area • Contaminant concentrations must be considered in the design of the application • Distribution of the product should be consistent with the contaminant concentrations

  32. Questions? www.Terra-env-corp.com

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