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Non-Aqueous Phase Liquid
• Georgia State Rules
Chapter 391-3-15-.09 Release Response and Corrective Action for UST Systems Containing Petroleum
• Remediate free product that exceeds one-eighth inch (1/8”) thickness or an alternate thickness, as approved by EPD
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Non-Aqueous Phase Liquid
• For soil and groundwater contamination can conduct a risk-assessment
• Conduct a receptor survey
Private and public water-supply wells
Surface water bodies
Public utilities
Basements
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Non-Aqueous Phase Liquid
• Conduct a fate and transport groundwater model
• Will evaluate if there is impact to the receptor (drinking water well or surface water)
• Can calculate alternate cleanup concentrations for soil and groundwater
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Non-Aqueous Phase Liquid
• Most common remediation
Air sparge and vacuum extraction
Pump and treat
Mobile vacuum units
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Tennessee
• Remove free product to the maximum extent possible
• Will be implementing RBCA soon
• Has had residual free product where a risk assessment was conducted for NFAR
• Most common free product remediation is by dual-phase extraction
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Mississippi
• Remediate free product that exceeds one-eighth inch (1/8”) thickness
• No risk assessments or fate and transport modeling for dissolves
• Most common free product remediation is by dual-phase extraction
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South Carolina
• Remediate free product that exceeds 0.01 feet
• Conduct risk assessment to evaluate receptor on each site
• Having good results with pay for performance on free product removal
• Using mobile vacuum units and SVE
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Refineries, Pipelines, Tank Farms
• Georgia – Georgia Geological Survey Default to UST regulations or Clean Water Act
• Tennessee – Solid Waste Hazardous Unit
Default to UST or Water Quality Act
• Mississippi –Uncontrolled Site Haz. Waste
• Kentucky – Superfund
Can use a risk-based cleanup
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Free Product Remediation
• A gasoline station from the 1930s to 1996
• February 1993 vapors migrated through the sanitary sewer into a nearby church and school
• September 1996 closure of 4 USTs
• Interim measure in 1996 and 1997, 15 EFRs
• Install 25 recovery wells and SVE
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Free Product Vapor Impact
• Reported USTs out of service for 20 years
• February 1998 closure of 3 USTs
• January 2000 free product in one well
• Vapor migration to the building crawl space
• Polyethylene sheeting and grout poured in the crawl space to act as an impermeable layer
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