meant different equipment set-ups were
required during pile driving.
An excavator-mounted vibratory
hammer/extractor was used to install
most of the sheets, says Le, while in a
few areas where soil obstructions were
encountered, a set-up using an HPSI 300
XL Vibratory Hammer and a Link-Belt
HSP Rough Terrain Crane was put in place.
“Once the sheet piles were installed,
the sealable joints were cleaned and
inspected to confirm that they were not
separated or damaged. Subsequently,
C3 sealed each joint with a cementi-tious
based grout from bottom to top
VISIT US!
FN618/5
supply the Waterloo Barrier® materials as
well as perform the quality assurance and
control inspection and sealant installa-tion
services during construction.
According to Le, Loiselle Environment
used a typical set and drive procedure
to install the sheet piles provided by C3
Environmental.
Le says due to the nature of the land-fill
area, piling workers had to deal with
various obstacles that included tree
trunks, metal drums, tires, vehicle parts
and heavy equipment.
He adds that differing soil conditions
were also encountered at the site, which
HEM EXCAVATOR DRILLING ATTACHMENT
• Suitable for most types of drilling, including hollow bar installation
• Attaches quickly and easily to most excavators
• No additional hydraulic plumbing required
• 360-degree rotation, remote control
WWW.TEIROCKDRILLS.COM
MANUFACTURED IN AMERICA | DISTRIBUTED WORLDWIDE
using injection line.” Le said. “The line
was inserted to the bottom of each joint
facilitating the emplacement of sealant
into the entire length of the joint.”
A total of 656 galvanized steel
sheets, including four corner sections,
were driven for the containment cell.
Following its completion, the struc-ture
was covered with an engineered
cap to minimize the amount of pre-cipitation
infiltrating the cell. This
cap is three-quarters of a metre thick
and is comprised of geosynthetic
clay cap, granular materials, topsoil
and vegetation.
Hundred-year lifespan
Throughout construction, the integrity
of the containment cell structure was
confirmed by regular inspections by
C3 Environmental personnel. Le says
the company’s rigorous quality assur-ance
and control program enables C3
to offer an excellent performance war-ranty
on Waterloo Barrier® Systems for
one year after the installation. However,
he adds that the normal lifespan of a
typical Waterloo Barrier® System has
been estimated in excess of 100 years for
underground applications.
Le says the remote location of the
containment cell was one of the biggest
challenges for those involved in the the 5
Wing Goose Bay project.
“It was difficult to obtain the required
sheet pile driving equipment and ser-vices,
and when the operation required
parts and repair services for the rare
equipment breakdowns, parts had to be
flown in from St. John’s, Newfoundland,
or larger cities,” said Le. “Specialty labour
resources also had to be flown in from
other cities as well.”
The site is situated on a migratory bird
flightpath, so the containment cell also
had to be completed on a compressed
schedule to avoid the primary migratory
period and harsh winter weather.
Le notes that one of the unique
aspects of the project was an engineered
wetland that was put in place follow-ing
completion of the containment cell.
The wetland was designed to provide
passive treatment of potential contami-nants
discharging to surface water in the
area of the Waterloo Barrier® System, he
says, thereby helping to protect various
potentially sensitive ecological species
that inhabit the area.
GREAT CANADIAN PROJECTS
42 Q1 2019 www.pilingcanada.ca
/WWW.TEIROCKDRILLS.COM
/www.pilingcanada.ca
