Olympic Peninsula. It serves general
and commercial purpose traffic, highoccupancy
vehicles, transit, bicyclists
and pedestrians. In 2016, it served
a ridership of more than 9 million
people, including more than 5 million
foot passengers.
PPM’s scope includes replacing the
timber trestle with a new concrete and
steel trestle, reconfiguring the dock
layout to provide safer and more efficient
operations, replacing the vehicle
transfer span and the overhead loading
structures of the northernmost
Slip 3, replacing the King County water
taxi facility on the south edge of the
dock, constructing a new entry building,
elevated plaza and view platform
and maintaining a connection to First
Avenue via the Marion Street Bridge.
Construction will be performed in
stages, as it is an occupied facility that
must continue to operate during construction
and satisfy mitigation for an
additional 5,200 square feet of overwater
coverage. Implementation of the project
involves complex scheduling, phasing
and coordination with a large number of
project stakeholders including the end
users, which creates unique and complex
working conditions. There is also a
meaningful environmental element. An
estimated 7,400 tons of creosote-treated
timber piles will be removed from Elliott
Bay and open up an area of shoreline and
near-shore habitat. Other environmental
considerations include stormwater
treatment for new and replaced areas of
the trestle and remediation of contaminated
sediments.
Construction activities began this
spring with construction expected to
be complete in early 2023. Major inwater
work is limited to half the year
due to environmental regulations to
protect marine species. A successful
test pile program was carried out by
PPM to evaluate pile size and type and
amass underwater acoustical data to
assist regulatory agencies in determining
the appropriate monitoring zones
for protected species, both major considerations
for the implementation of
the project.
“Beyond the regional importance
of this project, it also marks an
important departure from conventional
design-bid-build traditionally
employed in favour of alternative
delivery methods, in this case GC/
CM,” said Mansfield. “By doing so, it
allows us to bring to bear our considerable
experience with over-water
demolition and construction and
understanding of pile installation,
and capture that as added value for
the project. We’re very proud to be
a part of this program and look forward
to our continued partnership
with the state to steward this project
to great success.”
As for what the future holds for PPM
and its involvement in Canada, PPM
Civil Constructors is excited about the
direction the market is heading and
the great teaming opportunities with
companies providing complementary
services in the environmental, heavy
civil, and deep foundation markets.
Keep an eye out for more PPM-lead
projects ahead.
COMPANY PROFILE
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