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Cobb Creek UST
Eakley, OK
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Client:
Cobb Creek
Station, Eakley, OK
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Creek Station Remedial Operations adn Visitors |
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The
Cobb Creek Station UST site is located in Eakley, Oklahoma, in westcentral
Oklahoma. The site was impacted by free phase and residual phase
of gasoline released from leakage underground storage tanks. Depth
to the contaminated zone was 18 to 28 feet. Site geology was silty
sand and sandy silt. The volume of contaminated soil was estimated
to be 14,500 cubic yard. The impacted zone had been previously treated
by other remedial technologies, such as air sparging and soil vapor
extraction, but with limited success. The primary goal was to remove
the free phase/residual gasoline fuel which was unable to clean up
by other remedial technologies. The secondary goal was to achieve
site-specific treatment level (SSTL).
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TASKS
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- Injection
of one pore volume (140,000 gallons) of surfactant
solution (< 1 wt%) to recover free phase
product in 20 days
- Chemical
oxidation (convention Fenton's Reagent) was used
to treat the residual dilute plume to achieve the SSTL.
A total of 135,000 gallons 0.6 wt% H2O2 was injected
during the Phase 1 period. Additional 3000 gallons
of 1.5 wt% H2O2 was used during Phase 2 period
- Initial observed GRO in the soil were between 150 to 366 mg/Kg in the source area. Final GRO at the
source zone reduced to 6 to 34 mg/Kg during the post
surfactant flushing and chemical oxidation event. Post
treatment soil benzene concentrations were between non-detected
to 1.16 mg/Kg (SSTL = 1.216 mg/Kg)
- Post
chemical oxidation indicated benzene concentrations
in groundwater were significantly reduced (one to three
orders of magnitude reduction) at the treated area to
non-detected or low ppb levels
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