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Soil Vapor Conditions & the Soil Vapor Extraction System in Residential Roxana, Illinois
Presenter: Bill SinnottIllinois Environmental Protection Agency
Bureau of LandPermits Section217/524‐3310
is short‐hand for contaminant vapors found in soils above underground contamination.
led to IEPA requiring Shell to perform testing underhomes (sub‐slab) and inhomes for vapors.
Based on that testing and area vapor monitoring point data, temporary internal combustion engine (ICE) units (for example a truck engine) were installed to remove and combust the vapors in the affected area at 4th St. and Chaffer.
ICE units operated from May 2011 to January 2012.
The SVE wells extract vapors and the vapor monitoring wells measure concentrations of those vapors.
The graph was created by URS and modified for the purpose of this presentation
Today we have 55 Vapor Monitoring Points (VMPs) located in Roxana and on the Wood River Refinery property.
Vapor monitoring wells are sampled at approximately 5, 10, 25 and 40 feet below ground surface.
Vapor monitoring wells are monitored quarterly and based on their results more wells will be added as needed.
• Installation began in January and ended in April 2012 which is located between 4th & Chaffer and along the west fence line of the refinery.
• In December 2012 the full scale system was expanded to include wells at the Public Works Yard.
N
The shallow concentrations have remained low, while the deeper concentrations have significantly decreased.
0
50
100
150
200
250
3Q'10 4Q'10 1Q'11 2Q'11 3Q '11 4Q '11 1 Q' 12 2Q'12 3Q '12 4Q'12
Benzen
e (m
g/m
3 )
Sampling Period
VMP‐5Near Chaffer in Alley between 5th and 6th Streets
5 12.5 31Feet bgs
4th Quarter 2012
Please note that all concentration trends are dropping and shallow
vapor concentrations are consistently low beneath the Village
of Roxana.
5 feet below ground surface
10 feet below ground surface
Future Activities
• Monitoring and vapor extraction will continue until the vapor remediation objectives are met.
• Additional soil sampling was recently performed at the Public Works Yard, and this information will be used to determine if additional remedial measures are necessary.The report of this analytical data is currently under review.
