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Tulsa Utility Trench
Tulsa, OK
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Client:
ARCADIS
G&M, Inc.
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| On-site
Surfactant/Oil Phase Behavior
Study Before Injection |
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A limited surfactant flood
was conducted at the Texaco Station located on the corner of Yale Avenue
and 61st Street in Tulsa Oklahoma. Between April 30, 2001 and May 2,
2001, the selected surfactant solution was pumped into a utility trench
adjacent to Yale Avenue to remove residual hydrocarbons from the shallow
subsurface (2 to 6 feet depth). The objective of this project was to
use Surfactant Enhanced Subsurface Remediation (SESR) to enhance residual
product removal from the Yale Utility Trench. Removal of the residual
hydrocarbons will eliminate the trench as a potential source area. The
hydrocarbon removal was accomplished through the application of the
SESR technology over a three-day period.
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TASKS
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- Conducted
site investigation and well installation. After site assessment,
eight wells were installed for the purpose of groundwater
extraction, surfactant injection, and monitoring. These
wells were installed in a manner to enable direct connection
of all injected fluids to the trench fill materials.
- Baseline
groundwater samples were collected and analyzed the concentrations
of BTEX by the main contractor, ARCADIS G&M, Inc.
Post-surfactant flood samples were collected at the end
of July 2001.
- The
surfactant flushing was conducted via the following flow
schematic shown in the figure. Surfactants were injected
into injection wells IW-1 and IW-2 as shown in the figure
below.
- The
low concentration surfactant system used consisted of
0.5 wt% of Tween 80 and sodium dioctylsulfosuccinate (Aerosol
OT) respectively and 1 wt% of NaCl.
- Overall
2,430 gallons of surfactant solution was injected at the
site. A 6 to 200 fold increase in contaminant removal
in the groundwater was observed during the surfactant
flushing stage.
- Based
on the post-surfactant soil samples, the remaining concentrations
of BTEX appear to be well below the prescribed treatment
standard.
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