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Several pilot-scale technology demonstrations were conducted recently at the NBVC to address a large Mt BE plume resulting from past underground pipeline releases of gasoline.
At a depth of 10-20 ft below ground surface (bgs), the 5,000- by 500-ft dissolved Mt BE plume mixes with a smaller BTEX plume and sands contaminated from residual non-aqueous phase liquid.
NATIONALITY: Iranian DATE OF REGISTRATION: 01/03/2009 EMAIL: [email protected] SUPERVISOR: Assoc.
The AS system employs nine wells through which air is injected in pulsed intervals at a rate of 0.0-2.0 scfm.
Site soils consist of silt at depths of 1-45 ft below ground surface (bgs) underlain by sands to a depth of 55 ft bgs.
The depth to ground water in this area fluctuates from 45 to 54 ft bgs.
Although the Mt BE plume has expanded under the natural hydraulic gradient, total concentrations have decreased significantly (Figure 1).
Concentrations of Mt BE and total BTEX exiting the source zone each exceed 10,000 mg/L, while concentrations of TBA exceed 1,000 mg/L.
A lower clay aquitard located 20 ft bgs bounds the aquifer, through which ground water flows at an average velocity of 1 ft/day.
Most of the UST sites where active remediation is ongoing or planned utilize soil vapor extraction (SVE) to enhance biodegradation of Mt BE and BTEX.
The approved remediation plans at many of these sites also include air sparging (AS).
The total project implementation cost to date is ,000, with a cost of ,000 expected for maintenance and monitoring over the next two years.