Technology Status Report: In Situ Flushing - CLU-IN

In Situ Flushing Project Summaries
GWRTAC Case Study Database
GWRTAC ID: FLSH0011
Project Name: Estrie Region Machine Shop, Quebec, CA
City: Quebec City State/Province: QC
Primary GWRTAC Personal
Communication Source
(Name/Organization):
Project Summary:
Charles Boulanger
GSI Environnement
Report(s)/Publication(s) (GWRTAC Source):
Ground-Water Remediation Technologies Analysis Center (GWRTAC), 1996: Technology
Evaluation Report TE-96-002, Surfactants/Cosolvents, Dr. Chad T. Jafvert, Purdue University,
GWRTAC, 320 William Pitt Way, Pittsburgh, PA, available at www.gwrtac.org
Rice University, 1997: Technology Practices Manual for Surfactants and Cosolvents, Rice
University, 6100 Main Street, Houston, TX 77005-1892, February 1997
GSI Environnement (formerly Ecosite, Inc.), 965 Newton Ave., Office 270, Québec City, Qc.
Canada G1P 4M4, Marketing Information
The following was excerpted from Ground-Water Remediation Technologies Analysis Center
(GWRTAC), 1996: Technology Evaluation Report TE-96-002, Surfactants/Cosolvents, Dr. Chad T.
Jafvert, Purdue University, GWRTAC, 320 William Pitt Way, Pittsburgh, PA, available at
www.gwrtac.org, and Rice University, 1997: Technology Practices Manual for Surfactants and
Cosolvents, Rice University, 6100 Main Street, Houston, TX 77005-1892, February 1997, which
cites Ross, et al., 1996:
"During the fall and winter of 1993-94, Ecosites Inc. in Quebec City started the in situ restoration of
contaminated soil under a machine shop building. The contamination was cutting oil extended from
6 to 14 feet (1.83-4.27 m) beneath the concrete slab. This represents a volume of 2350 cu. yd.
(1,800 m3) of oil laden soils with concentrations reaching 200,000 ppm (mg/kg). Moreover, a freefloating
product phase of hydrocarbon reaching 3 feet (~ 1 m) in free thickness was observed."
The watertable was at approximately 3 m BGS. The hydraulic conductivity was 10-4 cm/sec. 400
injection-extraction wells were installed in 3 distinct zones: A peripheral network to hydraulically
isolate the contamination, a second zone used only to extract the oils and washing solutions, and a
third zone which was used both to inject and extract material. The extract was processed on-site
in a wastewater treatment system. Laboratory feasibility trials were performed to: select the
surfactant, evaluate biodegradability and toxicity of wash solutions, and plan hydraulic controls. A
computerized system for data acquisition was installed to monitor ground-water movement.
"A total of 157.5 metric tons (160,000 kg) of oil has been extracted from the subsoil in less than
110 days of operation. During 20 days in the fall 1993 and another 30 days during the winter 1994,
8,270 gallons (37,600 liters) of free oil were recovered. and the sludge in the water treatment
system trapped the equivalent of 2,090 gallons (9,500 liters) of oil. The second cycle consisted of
Ground-Water Remediation Technologies Analysis Center
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Appendix - Page 21 of 164
Copyright GWRTAC 1998
Revision 1
Tuesday, November 17, 1998