Application of electrical resistance heating for remediation petroleum hydrocarbons at Greensboro maintenance yard

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Project History

  • Former FDOT Maintenance Yard
  • Operated from 1965 to 1997
  • Facility dispensed diesel fuel and unleaded gasoline from 3 USTs; 1 AST used to store used oil
  • USTs/AST removed in 1997
  • SAR/Pre-RAP Monitoring results indicated:
    • Presence of light non-aqueous phase liquid (LNAPL)
    • at depth (approximately 23 feet below land surface)
    • source area assessed as approximately 3,736 square feet (defined by 1,000 parts per million soil OVA readings)
    • Significant dissolved phase groundwater plume
    • approximately 1,100 feet in length
    • dissolved phase groundwater encompassed area of approximately 7 acres (defined by 1ug/L Benzene isoconcentration contour line)
  • Remedial Action Plan (RAP) Considerations:
    • Source material (i.e., LNAPL) was located moderately deep
    • prevented simple excavation - would need to slope excavation side walls and de-water excavation
    • Source material present in close proximity to existing FDOT maintenance yard structure
    • prevented simple excavation - would require installation of sheet piling to stabilize building foundation
    • Dissolved phase contamination extended underneath active agricultural area (i.e., tomato field)
    • could not interfere with crop planting/harvesting
  • RAP Technology Evaluation
    • Utilize in-situ technology to remediate source material
    • Utilize groundwater extraction installed to minimize impact to agricultural processes
  • RAP Recommended
    • Implementation of the Electro Thermal-Dynamic
    • Stripping Process (ET-DSPTM) as the thermal enhancement technology
    • Selected for low cost, implementability, minimal site impact, uniformity of heating, and scalability
    • Utilize DPE to remediate dissolved phase groundwater plume. Install entirely below land surface.
  • RAP approved July 2001
  • Construction began late August 2001 (both source area and dissolved phase)
  • Started heating January 2002

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