As environmental contractors and engineers, C3 Environmental provides a
solid practical approach to the application of innovative environmental technologies.
The combination of active research, thorough engineering controls and years of
solid construction experience, means C3 Environmental has a unique ability to
provide a comprehensive solution to complex problems.
Limited is the exclusive Canadian licensee for the Waterloo Barrier®, a steel
sheet piling system with sealable joints designed to provide a very low permeability
barrier for containment of groundwater. Waterloo Barrier® can be utilized
to construct cutoff walls, for source zone isolation cells and as impermeable
structural shoring to facilitate excavation of contaminated soils. It was developed
at the University of Waterloo under the direction of Professor John Cherry. As
well as participating in the development of the system, we have completed numerous
projects for major industrial clients across North America.
of Waterloo Barrier®
Low permeability containment walls are increasingly
being applied in the control and remediation of groundwater pollution. Conventional
technologies such as slurry walls and geomembranes do not necessarily provide
cost-effective and efficient subsurface contaminated in all settings. Groundwater
researchers at UW considered this in their construction of containment cells for
field experiments involving contaminated groundwater. The concept of driving steel
sheet piling and sealing joints between adjacent piles was thus introduced. After
a series of successful experimental cells the potential utility of Waterloo Barrier®
in real site conditions was confirmed with approximately one year of prototype
field-testing. UW and CMRM then collaborated to develop sheet piling in which
a sealable cavity was incorporated into the pile interlock in the manufacturing
process. A roll-formed shape was produced, and made available for field trials
in 1991. Extensive field scale tests were conducted by UW, and bulk hydraulic
conductivity values of less that 10-8 cm/sec were achieved. Installations of a
commercial nature are currently in service.
Potential uses of the Waterloo Barrier® include:
- Deep, enclosing
barriers around hazardous waste sites or municipal landfills.
- Shallow, enclosing
barriers to contain petroleum products or other light contaminants which float
on the water table.
- Shallow or deep enclosures to control future groundwater
contamination at new industrial or waste disposal sites.
- Temporary, enclosing
barriers to facilitate various removal or in situ remediation procedures.
Barriers along shorelines to prevent seepage of contaminated groundwater into
- Isolation of accidental spills.
- Cofferdams in waterways
to facilitate efficient dewatering procedures.
- Funneling or directing contaminated
plumes to enhance the efficiency of pump-and-treat techniques.
control in construction projects involving excavating and tunneling.
- Rapid installation and sealing
- Minimal disturbance
of site during construction.
- Easily adapted to irregular layouts.
Limited site access less of a problem compared to alternative cut-off wall techniques.
- Easily installed in areas with high water tables and surface water.
Easy to inspect and monitor for superior quality assurance and control during
- Predictable hydraulic performance.
- Positive public perception.
- Long service life for permanent installations.
- Can be easily removed
where applications are temporary.
Installation and Sealing
Barrier® sheet piles are installed using the same equipment and techniques
as conventional product. Vibro equipment is suitable for most soil conditions
although better results may be achieved with impact equipment in certain cohesive
soils. Vibratory drivers with an eccentric moment in the area of 3000 in-lbs are
recommended for both WZ75 and WEZ95. Pile lengths of up to 70 feet are available
and for greater depths the piles can be spliced. Corners and special fabrications
are available for any geometric layout. A footplate at the toe of each larger
interlock prevents most of the soil from entering the sealable cavity during driving.
After driving the cavities are water jetted to remove small amounts of loose soil
and are ready for the injection of sealant. A number of clay-based, cementitious,
polymer and mechanical sealants are available to meet a variety of site conditions.
Assurance & Control
Potential leak paths through the Barrier are limited
to the sealed joints and therefore the joints are the focus of the quality control
procedures. Joints are inspected before the sealing operation to confirm that
the complete length of the cavity is open and can be sealed. Video inspection
equipment can be lowered into each clean cavity to provide a permanent visual
record. Each joint is sealed from bottom to top facilitating the emplacement of
sealant into the entire length of the joint. Repair procedures can be initiated
if joint separation or blockage is suspected. Quality assurance and control is
further confirmed by the requirement that the pile driving and sealing be carried
out by or under the supervision of trained and licensed personnel.
Barrier® is Available in Two Designs.
ASTM A572 GR50
Manufacturing: ASTM A6
Coatings: 1) Galvanized, ASTM A123,
2)Coal Tar Epoxy, SSPC-16
3)Fusion Bonded Resin, ASTM A950.
Bends Can Be Supplied to any Angle.
'T' Sections and Other Welded
C3 Environmental Limited
is a member of
The C3 Group of Companies
Telephone: (519) 648-3611
Fax: (519) 648-3505