160 Vinyl Court - Daily Commercial News

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Page D-2
Demolition & Environmental Engineering
Daily Commercial News November 27, 2015
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Page D-3
Demolition & Soil Remediation – Caravelle
Mississauga, Ontario
Delsan-AIM was contracted to demolish a Former Xerox
Building in Mississauga Ontario. This on-going project
requires the abatement of asbestos, hazardous building
materials and the removal of contaminated soils.
Dow Chemical – Petromont Inc.,
Varennes & Montreal East, Quebec
Delsan-AIM was awarded a contract with Pétromont Inc. (a
subsidiary of Dow Chemical Canada Inc.) to perform the turn-key
decommissioning and demolition of two petrochemical plants in
Québec – one located in Varennes and the second in Montréal East.
Bruce Nuclear Generation Station
Tiverton, Ontario
Delsan-AIM was contracted to undertake the transportation and
demolition of heavy equipment – which includes steam turbine and
overhead crane components – that are being removed from one of the
operating units of the Bruce Nuclear Generating Station.
160 Vinyl Court
Woodbridge, ON L4L 4A3
(416) 494-9898
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Page D-4
Historic Overhaul
Demolition of Rainy Lake Hotel gives Fort Frances a fresh start
PETER KENTER
B
CORRESPONDENT
uilt in 1928, the Rainy Lake Hotel was once the go-to
location for social occasions in the northern Ontario
town of Fort Frances. However, following a legal dispute about 10 years ago, the premises was padlocked and
never reopened. With no interested bidders on the derelict
property, ownership eventually fell to the town.
“Without any sort of regular maintenance, time took its
toll on the building,” says Fort Frances’ chief building official
Travis Rob. “Two of the foundation walls had already collapsed. Eventually, the best thing you could say about it was
that the basement featured a 16-inch deep swimming pool in
summer and an ice surface in winter.”
The city recently tendered out demolition of the hotel,
awarding the contract to JMX Contracting Inc. of Gormley,
Ont. for a total value of just under $600,000. Pinchin Environmental was awarded the contract for quality assurance
and quality control air monitoring during the demolition.
“When I took JMX co-owner Jeff Norton on a tour of
Economic Snapshot
Leading indicators of Canadian economy
still pointing (somewhat) higher
cles hit a record high of 18.6 million units largely due to
Nearing the end of what appears to have been a
strength in sales of domestic vehicles.
relatively lacklustre year, the most recent indicators of
Looking forward, after a brief retreat (to 48.7) in
economic growth are still sending mixed signals.
September, the MNI Chicago Business Barometer Index
Turning first to the really big picture, in its latest
rebounded to 56.2 in October, its highest value since
(November) Economic Outlook, the OECD noted
January of this year. Further, although the Conference
that “a further sharp slowdown in emerging market
Board’s Index of Leading Indicators retreated slightly to
economies is weighing on global economic activity and
123.3 in September, it remains close to its recent 9-year
trade.”
high of 123.5, achieved in June of this year.
While the OECD expressed increased concern
John Clinkard
Turning to Canada, although there are clear signs that
about the health of the global economy in general, it
the economy has picked up speed following back-to-back
was definitely more upbeat about near term prospects
declines in the first two quarters, the prospects for growth
for the U.S.
are overshadowed by increased concern about the negative impact of
Despite the fact that the OECD Leading Indicator of U.S.
recent declines in oil prices on energy investment in Western Canada.
economic activity has slipped from a recent (July 2014) high of
Consequently, despite the relatively upbeat pattern of recent
100.6 to 99.1 in September of this year, the OECD noted that
indicators of U.S. economic activity, the prospects for Canada
U.S. output remains on a solid growth trajectory propelled by
appear more guarded. For example, although, the CFIB’s Busidomestic demand.
ness Barometer exhibited a solid 5.8%m/m increase in October,
This more upbeat outlook for the U.S., the market for over
at 58.9% it was well below its year ago level of 67.8%.
75% of Canadian exports, is reinforced by several current and
Also, after posting a solid 10.9% gain (to 58) in August, the Ivey
forward-looking economic indicators.
PMI exhibited back-to-back declines of -6.9% m/m and -1.7% in
Probably the most important indicator of current activity
September and October. Assuming that the drag on the economy
is the very strong (271,000) gain in total employment. Indeed,
due to weak energy investment gradually dissipates over the next
based on the U.S. household employment survey, full-time hiring
couple of quarters, we expect that the positive combination of
has exhibited very strong growth over the past several quarters.
stronger U.S. demand for exports of manufactured goods, especially
Further, the fact that real weekly earning are up by 2.3% in Sepmotor vehicles and parts, plus a late-year increase in fiscal stimulus,
tember 2015 compared to 0.7% a year earlier suggests that perwill cause the economy to gain momentum heading into 2017.
sonal incomes are finally starting to recover.
Given this strengthening external demand and a pickup in
Consistent with the strong pattern of full-time hiring and the
investment later in the year, we expect the Canadian economy to
concomitant acceleration in real weakly earnings, consumer conexpand by 2.3% in 2016 following a gain of 2.4% in 2014 and an
fidence reported by the University of Michigan increased by 4.3%
estimated increase of 1.2% in 2015.
in November, taking the measure of consumer expectations to its
highest level since June of this year.
Fuelled (literally) by the relative increase in disposable
John Clinkard has over 30 years’ experience as an economist in international,
incomes stemming from low oil prices, rising employment and
national and regional research and analysis with leading financial institutions
the recent upturn in consumer confidence, sales of motor vehiand media outlets in Canada.
Ivey Purchasing Managers Index and U.S. ISM Composite (Manufacturing and Non-manufacturing) Index
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©2015 CanaData. All rights reserved.
Vol. 13, Issue 22
JMX CONTRACTING INC.
After 10 years of vacancy, the historic Rainy Lake Hotel in
Fort Frances, Ont. was demolished by order of the city. A
market square and farmers’ market are planned to occupy
the space to attract visitors to the downtown core.
the building, I neglected to point out to him that one of the
unwanted visitors to the building had placed a very accurate
life-sized dummy on one of the beds,” says Rob. “That’s just
the kind of building it had become.”
Norton notes that, other than the occasional surprise left
by interlopers, the building had been frozen in time on the
day the doors were padlocked.
“Tables were still set for dinner and the dishwashers were
still loaded with dishes and cutlery,” he says.
While valuable salvage was limited, JMX removed the
metal railings from the front of the building and delivered
them to the local historical society. The town also specified
the removal of two murals by noted Thunder Bay artist Helen
Strickland.
“The building was made largely of masonry, brick and
steel,” says Norton. “It stood three storeys on a big footprint of
about 12,000 square feet. The biggest challenge was to make
sure that no debris landed on the adjacent buildings, which
were all single-storey. We set up a brick deflection system to
make sure the neighbours were protected.”
Following minor asbestos abatement, full-out work began
Oct. 5 when JMX deployed a Caterpillar 330 high-reach
excavator to rip into the building, first taking out the lower
back sections to provide additional work space. With that
area backfilled, the excavator began to dismantle the building
from the top down as the sidewalk in front of the building
was temporalily closed.
With limited on-site storage space, the contractor maintained a steady stream of trucks delivering debris off site.
JMX handled its own dust suppression efforts using a
misted water spray.
As the available work footprint grew, JMX brought in
additional excavators.
Norton notes that he was alerted to the potential for a large
local audience as the building was demolished.
“One of the people who settled in with a lawn chair told us
he was a bellhop at the hotel in 1962,” says Norton.
Timing was critical for local business owners who were
concerned that demolition efforts might drive away Christmas shoppers.
Initial estimates indicated that the demolition and backfilling might take two months. Primary demolition and backfill was completed in just three weeks with road closure limited to a few days.
“We’re beyond pleased with how smoothly and efficiently
this demolition project was completed,” Rob says.
Plans for the site include the construction of a market
square and farmers’ market that will attract visitors to the
downtown core.
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Page D-5
Stormwater Management
Central parkway garden: Mississauga’s silva cell saviour
DAN O’REILLY
N
CORRESPONDENT
amed after the street it’s located on in the central
downtown portion of Mississauga, Ont. the Central
Parkway Rain Garden is only 40 metres long and
four metres wide.
Nevertheless, the City of Mississauga and the Credit Valley
Conservation Authority (CVCA) believe the demonstration
project will provide valuable answers to stormwater management and ultimately lead to a more sustainable and green city.
The actual physical construction was completed in late
2014 by Pacific Paving, but the project is not considered finished, as the garden will be monitored on a long-term basis
by authority staff.
Designed for a “27-millimetre rain event,” it captures, filters and slows down stormwater runoff through the use of
“silva cells,” a modular polypropylene frame filled with bioretention soil buried below the concrete median.
The cell system sustains six salt-resistant Chanticleer
pear trees which are an integral component in stormwater
management, says Scott Perry, Mississauga’s stormwater coordinator.
This is not the first time Mississauga and the CVCA have
partnered on stormwater control projects incorporating a
variety of low impact technologies or LID.
But this is the first LID project initiated by the city rather
than the authority. And it’s the first time in Mississauga the
silva cell system has been specifically used for stormwater
retention as opposed to encouraging tree growth and esthetic
design, he says.
“The stormwater naturally drains towards the middle of
the road,” says Perry, explaining why a section of the fourlane Central Parkway East just south of Burhamthorpe Road
was selected.
No grading or reconfiguration of the road was required.
Another factor in the site selection was that the lanes were
separated by an “underutilized” median — in other words
there were no trees or features that would have to be ripped up.
Although Pacific Paving had worked on other LID projects, this was its first time installing the silva cells and there
was a bit of learning curve, says Perry.
Vancouver-based DeepRoot Canada Corp. is the developer of the system and its internal design arm, Kestrel Design
Systems, designed the garden.
However, the project was managed by the city, with the
conservation authority serving as the consulting body which
included reviewing the drawings.
Like a traditional drain system, the stormwater is caught
by catch basins, but not sent directly into the storm drains.
Rather, it is directed into the soil where it is filtered and
absorbed by the soil and tree roots.
Besides removing nutrients before they can flow into the
nearby Cooksville Creek, the garden will cool stormwater
that gains heat as it travels along pavements. That heat component is just as environmentally degrading, says Phil James,
the conservation authority’s manager of watershed protection
and restoration.
An integral feature of the garden are sensors in both the
inlet and outlet manholes which document the effectiveness
of the filtering process.
“We can measure and quantify what (stormwater) goes
into the garden and what comes out,” says James.
Mississauga will be embarking on other LID projects as
part of an increased effort to reduce the amount of untreated
stormwater flowing from drains into nearby creeks and rivers
and ultimately into Lake Ontario.
Those projects will be conducted on a “case by case” basis,
says Perry.
In January, the city will be implementing a stormwater
surcharge on businesses and residents based on the amount
of impervious surfaces on their properties, he points out.
CITY OF MISSISSAUGA
Pictured are some of
the steps to creating
the Central Parkway
Rain Garden. Top,
forming of the planter
box, curbing and median; left, placement of
bioretention soil; right,
present condition.
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Page D-6
Toxic Avenger
Alexco Environmental Group specializes in mine-related remediation
PETER KENTER
A
CORRESPONDENT
lexco Resource, with offices in both
Canada and the U.S., is pursuing a
business model that involves purchasing distressed and environmentally impaired
mine sites, remediating those sites using proprietary and patented water treatment technologies and then resuming production.
The business model has proved so successful that the company has spun off a separate entity, the Alexco Environmental Group
(AEG), a wholly-owned environmental services division which offers mine-related environmental services, remediation technologies
and reclamation and mine closure services to
both government and industry clients.
In 2006, Alexco was the successful bidder
on the entire Keno Hill Silver District in the
Yukon, which had reverted to the ownership
of the federal government following the bankruptcy of its owners. The property, which
produced more than 217 million ounces of
silver from 1913 until 1989, includes several
mine sites and the ghost town of Elsa. One
of the terms of sale involved the requirement
to clean up decades worth of pollution and
tailings left on site by previous owners, with
Alexco fully indemnified against liability for
past pollution.
“We saw the property as a unique opportunity to put the site back into production
and create real value,” says Joe Harrington,
vice-president, technology and strategic
development, Alexco Resource U.S. Corp.
“By cleaning up the contamination, it helps to
strengthen a community connection and that
earns for us some social license to operate the
properties ethically. We developed strategies
with the government and community stakeholders for a combination of active and in
situ remediation using technologies we developed, for example to precipitate heavy metals
inside the mine’s underground tunnels.”
Harrington notes that the estimated
remediation cost totaled “north of $100 million” with Alexco putting $10 million of its
own money up front, while the federal government contributed the rest.
The Bellekeno mine, located in the district, produced from 8.5 to nine million
ounces of silver between its re-opening in
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RIVERHUGGER/WIKIMEDIA COMMONS
Pictured is the Animas River in Colorado, U.S. within 24 hours of the 2015 Gold King Mine
wastewater spill. A large interim water treatment plant was built by Alexco Environmental
Group to help mitigate the spill.
early 2011 and temporary closure in 2013 due
to depressed silver prices. The mine also produces lead and zinc found in the silver ore.
The success of its remediation technologies at Keno Hill led Alexco to separate AEG,
which opened offices in Vancouver, Denver,
Whitehorse and Toronto.
“We’re not like many of the full service
environmental engineering contractors,”
notes Harrington. “What we focus on are
very specialized tools that allow us to construct water treatment plants, get in and treat
sources of pollution to reduce the cost of
ongoing treatment, and install unique water
treatment technology and in situ remediation strategies.”
AEG took the lead in remediating the
Asarco Globe Smelter site, a 77-acre plot
located in Denver. Operating for more than
130 years as a cadmium smelter, it was proposed as a US Environmental Protection
Agency (EPA) Superfund site in 1993, requiring special federal attention. The property
and part of the surrounding area demonstrated high levels of cadmium, lead, arsenic
and zinc in both groundwater and soil.
“The consultants at the time thought it
would take 300 years to adequately remediate the site groundwater,” says Harrington.
“After using our patented in situ system for
precipitating metals from groundwater, the
EPA removed the site from its list last year.
We’re already seeing commercial development on the site in 2015.”
AEG’s most high profile contract was
awarded in the wake of one of Colorado’s
most prominent environmental incidents.
On Aug. 5, 2015, personnel of the EPA and
workers from Environmental Restoration
LLC accidentally caused the release of toxic
wastewater while attempting to add a tap to
a soil pile that resulted from the collapse of
earth at the mouth of the Gold King Mine
near Silverton, Colorado. The error caused
the pile to burst, releasing 11 million litres of
mine wastewater and fine grained mine waste
— containing such pollutants as cadmium,
lead and arsenic — into the Animas River,
turning the water a sulphuric yellow.
“We were selected by the EPA to handle
construction and operation of a large interim water treatment plant capable of treating
1,200 gallons per minute,” says Harrington.
“We received the contract on Sept. 25 and
completed construction of the plant in just
three weeks by Oct. 16.”
The plant removes metal-containing sludges from the water and then stores them on
site for potential beneficial re-use or disposal.
“This was a superior effort by our engineers,
scientists, employees and sub-contractors, all
of whom deserve credit,” says Harrington.
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www.unitedwrecking.ca
Page D-7
Page D-8
STATE OF THE ART EQUIPMENT
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As one of Canada’s leading demolition contractors,
Priestly Demolition Inc. is working hard to revitalize
Ontario’s landscape for the future.
Celebrating over 20 years in the industrial, commercial, institutional and private
sectors of the demolition industry, we want to acknowledge our sincere appreciation
and THANKS to our loyal customers, reliable suppliers and dedicated staff.
Women’s College Hospital, Toronto
Priestly Demolition Inc... A force to be wrecking with
Serving private homeowners, real estate developers, multi-national corporations,
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Page D-9
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Page D-10
Hazardous Materials
Nuclear facility demolition under ‘veil of secrecy,’ critics say
IAN HARVEY
A
CORRESPONDENT
fter decades of delay, a “challenging” contract to
demolish and remediate the Whiteshell Laboratories
in Manitoba is proceeding, but critics complain it’s
under a “veil of secrecy.”
The project has been met with extra public scrutiny because
it is one of only two known attempts to remediate a nuclear
facility. A $3.5-million contract was signed with Envirocon
Environmental Services recently and work began in October
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2015 with completion scheduled for April 2016.
“The contractor will remediate the crawlspace, demolish and segregate an 8,600 m2 portion of Building 300 and
design, engineer and construct an appropriate seal on the
remainder of the building,” the agency said in an email. “The
contractor will sort and remove all waste that is deemed
clearable for landfill and appropriate recycling. Finally, they
will backfill with appropriate fill, cap the area and cover with
top soil and natural grasses.”
Owner/operator Canadian Nuclear Laboratories (CNL) is
a subsidiary of Atomic Energy of Canada Limited (AECL)
and was created to take over operations last year, meaning it’s
responsible for the Whiteshell remediation.
However, it remains unclear whether the work can procede safely, said Dr. Gordon Edwards of the Canadian Coalition for Nuclear Responsibility, a group that’s monitored and
reported on the industry since 1978.
There are several large concrete silos containing nuclear
waste sealed inside and moving them would be problematic
both physically and in terms of finding another disposal site
let alone a permit to transfer the materials, he said.
“We are now finally in the age of wrapping up a nuclear
plant and dealing with the waste,” he said, noting there are a
host of challenges ahead.
Whiteshell was Canada’s second nuclear science research
and development laboratory when it opened in July 1963. It
was home to two reactors, one large and one small. In the
1980s massive 4,020-metre shafts were sunk during research
into how best to store nuclear waste. Those shafts were subject to persistent flooding and are now fully immersed and
inaccessible. The reactors were shut down in 1998 and in
2003 the facility closed, though it took until 2010 until it was
finally shuttered.
Since then, discussions have been ongoing as to how best to
demolish the structures at Pinawa in southeastern Manitoba.
“I’m not too happy with this veil of secrecy,” said former
Pinawa mayor Len Simpson, who stated he was also once a
Whiteshell employee. “The community should know what
the plan is.”
He said B300 building, which is the focus of the Envirocon
contract, has radioactive contamination in the crawlspace below.
“I’m not even sure they should be digging up the ground
because it’s probably safer to leave it all there undisturbed,”
he said, adding the building in question was a research facility inside the radioactive zone where scientists would experiment with radioactive materials.
“The first job will be where to put that radioactive material,” Gordon explained. “There are different types of radiation
and not all are easily detected so the job will be to determine
what levels exist and where and what material is affected.”
Paul Halliday, president of Canadian operations with
Envirocon Environmental Services, declined to comment on
the project specifically, but added the company has extensive experience with complex nuclear projects across several
types, including uranium mine and mill reclamation, uranium conversion plant demolition and plutonium facility
decontamination and demolition.
Envirocon describes the job as a “challenging radiological
remediation and demolition project.”
The scope includes project planning for demolition of B300,
which at one time housed 170 labs and 400 office spaces. It was
built in five stages and will be demolished in the same way.
The possibly contaminated HVAC system and filters have
already been removed and there have been radiation surveys
of the remaining interior and exterior. Materials that are not
contaminated will be sold as scrap or sent to landfill; contaminated materials will have to be contained and stored on site.
As part of the contract, Envirocon is also responsible for
radiation protection and Multi-Agency Radiation Survey and
Site Investigation Manual clearance surveys for which they
will use an experienced subcontract partner.
Envirocon also proposed what they called a “strategic
alternative to the original plan, suggesting that the crawlspace
remediation occur using specialized, small equipment, prior
to demolishing the B300 building structure.”
It would allow for a radiological clearance and a simpler,
cleaner demolition, the company said in a press release.
“It’s going to cost a lot of money but it will never be a
greenfield or a business park like they’ve talked about because
those concrete storage silos will still be there and it will still
have to be licensed as a nuclear facility,” said Simpson.
The final decommissioning is planned by 2022/23.
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Page D-12
Yorkville Extraction
Tight boundaries a challenge on downtown Toronto demo
PETER KENTER
D
CORRESPONDENT
emolishing a ninestorey office building at 94 Cumberland Street in the heart of
Yorkville calls for considerable finesse by demolition
contractor
Delsan-AIM,
which was awarded the
contract by condominium
developer Minto Group.
Not only does the building footprint take up most of
the property, but the building also sits at the intersection of Yorkville’s busy Bellair and Cumberland Streets.
Delsan-AIM began work
at the Toronto, Ont. building in May 2015, performing asbestos abatement on
sprayed fireproofing and
floor tiles and stripping out
interior architectural finishes.
“Based on the lack of
space surrounding the building, the heavy traffic on both
streets and the small shared
laneway we could use, we
decided our best option was
to install a crane in the centre of the building — only the
second time we’ve done that,”
says Carmelo Pastore, district
manager with Delsan-AIM.
The demolition company called in Burrell &
Associates Inc. to perform
field measurement of crane
restrictions, outlining where
the crane could swing and
where it couldn’t and where
the crane base needed to be
installed.
“We decided to install
the crane on the P2 parking
level on grade,” says Pastore.
“We broke out the parking
slab, excavated to the shale
and poured a concrete base
to slab level. We didn’t have
swing rights over adjacent
properties, so instead of a traditional hammerhead crane,
we chose a luffing crane,
which allows you to keep the
load within your own project
footprint by decreasing the
angle on the boom.”
The crane, supplied by
All-Canada Cranes, came
with a 164-foot mast and a
40 foot-boom.
However, a city project on
Bellair delayed the granting
of a permit that would allow
Delsan-AIM to obstruct traffic in order to install the crane.
“With the permit delayed,
we had to keep the project
moving, so we went ahead
with interior stripping, using
hydraulic mobile cranes to
lift Bobcats and small excavators from level to level,”
says Pastore. “We used the
stripped-out elevator shaft
to throw rubble down to the
parking level. We then excavated a 10-by-15-foot hole in
the northeast corner of the
“We decided our
best option was to
install a crane in
the centre of the
building,”
Carmelo Pastore
Delsan-AIM
DELSAN-AIM
Tight for space and without swing rights to adjacent buildings, contractor Delsan-AIM used
a luffing crane and installed it in the centre of the building. A stripped out elevator shaft
was also used to throw rubble down.
site through which we could
remove the rubble and truck
it away.”
Delsan-AIM received its
permit to install the crane
in mid-August, closing the
intersection from 7 p.m. one
weekday night to 1 p.m. the
following day. Mast climbers
were erected around all four
elevations of the building,
not only to provide access
to workers, but also to more
thoroughly protect passersby
under covered walkways
from any small chunks of
debris.
“We erected the mast
climbers by taking out strips
of precast concrete facings
around the building, so we
could anchor the climbers
into the building structure,”
says Pastore.
With mast climbers in
place, demolition would
proceed from the top down.
Larger precast panels would
be cut in half and all of the
panels would be secured
using spreader cables and
lifted up the side of the building via crane. Floor slabs,
columns and other large
debris would be lowered to
the building laydown area
using the crane, while smaller rubble would be dropped
through the elevator shaft.
With a maximum workforce of 13, including foremen, the demolition com-
pany had reduced the size
of the building to about four
floors above grade by late
November.
“At just three floors above
grade, we’ll have the ability
to bring the 50-tonne excavators from the back of the
compound straight into the
building footprint and treat
it like a more traditional
demolition project,” says
Pastore. “It’s moving along
much quicker than anticipated and we may be able to
demobilize the climbers and
bring in the excavators by
early December.”
At that pace, the company
expects to demobilize the
crane by late December or
early January.
“Once we leave the site,
the basement will be filled
with clean shale and the
excavation and shoring company will begin work on the
new building,” says Pastore.
SERVICES
Asbestos Removal
Infectious Control
Mould Removal
Interior Strip Out
Lead Removal
Full Structural Demolition
PCB Removal
Project Management
Fire Damage Restoration
General Contracting
Water Damage Restoration
(IICRC Certified)
215 Carlingview Drive,
Unit 309/310
Toronto, ON M9W 5E8
Tel 416-848-0508
Fax 416-679-8512
[email protected]
www.alwaysavailable.ca
Page D-13
Modified Manholes
Innovative system used in Horton Sanitary Sewer clean-up
DAN O’REILLY
N
CORRESPONDENT
ot only is the 1.2-kilometre-long
Horton Sanitary Sewer the longest
and one of the oldest in London,
Ont., an innovative manhole system designed
to provide access for cleaning the concrete
pipe may be the most unique in the country.
In a month-long operation, which had
to be conducted in the middle of night
when sewage flows were low, three specialized modified manholes with sealed access
flanges were inserted into the sewer this past
summer.
“We don’t think this (the design) has been
used anywhere else,” says David Evans, associate director, regional manager with the
London branch of R.V. Anderson Associates
Limited.
The consultant was retained by the City of
London after a camera probe conducted two
years ago revealed the sewer was half filled with
solids and grit which would eventually restrict
the flows, says Evans.
A traditional flushing of the approximately 70-year-old pipe wasn’t feasible because of
its original construction as a gravity sewer
and then its conversion to a siphon system 40
years ago.
“The energy savings have been significant, substantial,” says Evans, explaining the
reason for the conversion was to reduce the
costs of pumping the sewage from a deep wet
well up into the Greenway Sewage Treatment
Plant.
In a siphon system, the flow is moved
by hydrostatic pressure changes without
the need for pumping. The problem with
siphons, however, is that they typically get
build-ups of solids throughout the pipe and
R.V. ANDERSON ASSOCIATES LTD.
Work on the Horton Sanitary Sewer in London, Ont. was conducted overnight when sewage flows were low. Specialized modified manholes were created as part of the project.
need cleaning, as was shown by the camera
probe, he points out.
However, because of its original construction as a gravity sewer, there weren’t enough
manholes and the ones that existed were at a
considerable distance from the plant.
Manholes need to be appropriately spaced
for cleaning and adding new traditional man-
holes wasn’t feasible. The pressurized nature
of the pipe would cause a “gusher” if they
were opened, Evans says.
“We looked at a number of options and
one of the options considered was building
a twin pipe, but the cost would have been
astronomical, at least $1.5 million.”
Further undermining that option was the
fact the sewer winds its way through Greenway Park, a large park just west of downtown
London adjacent to the Thames River, built
over an old landfill site from the 1880s to
1920s that was in use.
“The soils are very poor,” he adds.
The solution was three modified concrete
manholes with special access flanges which
can be opened at night during low flow periods. The procedure requires some operational changes at the plant to allow the sewer to
temporarily revert back to gravity flow.
Because of the park’s poor soils the castin-place concrete manholes needed extralarge footings so they wouldn’t sink into the
landfill material, he says.
“We didn’t have a lot of information to go
on,” says Evans of the year-long design. The
consultant had to rely heavily on city maintenance staff ’s knowledge of the sewer.
Rather than hire an outside contractor,
the City of London opted to have its maintenance staff install the manholes. As opposed
to the lengthy design process, the installation
only took a month. But the operation did
require considerable co-ordination between
that department and the sewage treatment
plant operations personnel, says Evans,
pointing out the project’s value was only
about $200,000.
“By completing the construction of the
new maintenance holes with our in-house
construction crews, we were able to save time
and money, and incorporate design changes as
site conditions necessitated,” says Ashley Rammeloo, the city’s sewer operations engineer.
One of the significant findings of the
project was the condition of the decades-old
sewer, says Evans.
“It’s in excellent condition.”
Page D-14
Mould Infestation
Rooftop remedy gets to the heart of attic mould problem
PETER KENTER
W
CORRESPONDENT
hen mould infestation reared its ugly head in a
townhouse complex in Mississauga, Ont. solving
the problem required the direct approach — popping the roofs on every one of the 69 units diagnosed with
the problem.
The contract for the rent-controlled units operated by the
Region of Peel involved everything from roof and insulation
removal, dry ice blasting of all exposed wooden roofing members, replacement of insulation and reconstruction of the roof.
The general contractor on the project was Triumph Roofing, with Wickens Dry Ice Blasting Inc. taking on the remediation sub-contracting role. Stephenson Engineering Ltd.
designed the overall project, while Safetech Environmental
Limited designed the remediation protocol.
“In the case of this townhouse complex, the plywood
sheathing was in particularly bad shape due to exposure to
moisture and repeated wet-dry cycles,” says Simon Brown,
vice-president of contracting with Wickens. “We worked
with Safetech to determine that the best approach would simply be to peel everything off the roofing members to allow
us the greatest access to the rafters and joists that had been
exposed to mould.”
Dry ice is formed from liquid carbon dioxide, which is a
byproduct of other chemical processes.
“Dry ice blasting gives CO2 a second useful life and adds
nothing to the carbon footprint,” says Brown.
It’s formed into dry ice pellets about the size of a grain of
rice at -79 degrees Celsius. The pellets are then transported
in insulated plastic drums that contain up to 250 kilograms
of the material.
Remediation technicians use a high-volume compressor
to force the pellets through a nozzle and eject them at high
pressure. However, unlike traditional abrasive media, CO2
pellets provide an extra bang for the buck. After striking the
surface, they sublimate — transform from a solid directly to a
gas — with explosive force, lifting away contaminants in the
process and leaving no secondary waste.
Work on the project was occasionally delayed due to rain,
but began in mid-August with a project closing date of Oct. 3.
people to move out of their
homes during the project,”
says Brown. “Mould generally exists very close to the surface of the wood. We went in
with the blasting equipment
and took off a fraction of
an inch of the wood surface
exposing clean timber. We
then went in with a HEPAvac
system and removed the particles which were doublewrapped and shipped to
landfill.”
Safetech performed a
“tape lift” on the exposed
wood to determine that
remediation was successful.
“It’s an effective, highdetail test that involves
applying adhesive tape to
the wood surface at some
random location that’s been
remediated,” says Brown.
“You place the tape on a
microscope and count up the
WICKENS DRY ICE BLASTING INC.
The roof was peeled off this townhouse complex in Mississauga, Ont. to access moulded remaining spores to make
rafters and joists. Blasting equipment was used to shave the wood surfaces, exposing clean sure that the concentration is
timber and a HEPAvac system was used to contain the particles for transfer.
lower than you would expect
in the ambient atmosphere.”
“We tried to get into a rhythm of completing two to three
Once the wood is cleared of spores, it’s treated using an
units per day,” says Brown. “Triumph would expose the roof anti-microbial wipe and the surface is coated with a clear
members and we would go inside and blast the joists and tim- encapsulant.
bers.”
“It took us a day or two to find our rhythm,” says Brown.
Standard personal protective equipment used on the job “We brought in six people and eventually we were mixing
included a Tyvek suit, blue nitrile surgical gloves, steel-toed and matching nicely as the roofing contractor removed the
and shanked roofing boots, hearing protection and full face roof and insulation and we moved in to blast both units, then
masks offering P100 particulate filters.
followed up with the HEPAvac team. Eventually roofs were
“The attics were separated from the living quarters down- going back on at the beginning of the line as they were comstairs and it was determined that it would be safest to pro- ing off down the line. We just kept getting better and faster
ceed without containing the interiors of the units and forcing and brought in the job on time.”
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Page D-15
Page D-16
Downtown Transformation
Tower development supports Oshawa’s long-term vision
DAN O’REILLY
I
CORRESPONDENT
n what might have been considered a visionary, if not daring, move at the time, the City of Oshawa acquired an eightacre industrial site in the heart of its downtown 30 years ago
with the idea that it could be transformed into other uses.
That vision would appear to have been borne out.
Now occupied by the Oshawa YMCA and the Durham Consolidated Courthouse, the former General Motors automotive
assembly facility on Bond Street has become the focus of one of
the largest private sector investments in the downtown.
In early October, Toronto-based Atria Development began
construction of a $60-million 12-storey glass and metal panel
tower which will consist of 239 rental apartment units, more
than 13,000 square feet of commercial floor space, one level
of underground parking and 83 bike spaces.
Wallman Architects Ltd. is the architect and the structural
engineer is Jablonsky Ast and Partners. Caliber Structures
Ltd. is the construction manager.
Occupancy is scheduled for late 2016, with some construction extending in 2017, says principal Hans Jain, adding
Atria also plans to build a similar, albeit higher, tower on its
2.1-acre parcel.
Atria took an option on the parcel in 2006 and then closed
the deal with the city in 2011 after a major remediation was
CCI GROUP
SCIENCE • ENGINEERING • SOLUTIONS
CCI GROUP COVERS ALL STAGES
OF THE LIFECYCLE OF A BUILDING
• Environmental Site Assessments
• Hazardous Materials Management
• Pre-Demolition Surveys
www.ccigroupinc.ca
1.888.348.8991
[email protected]
completed, says Jain, who
credits city council and staff
for their “vision” in supporting the project.
Located at 100 Bond Street
East at the juncture with Carriage Works Drive, the tower
will be directly adjacent to
the courthouse on the east
side of that street. The name
reflects the fact the property
was the original home of the
McLaughlin Carriage Works,
the forerunner of General
Motors of Canada.
To the north of the Atria
site is the Oshawa YMCA.
“We had to have the
architects of the courthouse
WALLMAN ARCHITECTS LTD.
approve the (Atria) design,”
Toronto-based Atria Development has started construction of a $60-million, 12-storey
says City of Oshawa develop- glass and metal panel tower in downtown Oshawa, Ont. It is being built on part of what
ment services commissioner once was the General Motors automotive assembly facility on Bond Street.
Paul Ralph, explaining that
caveat is in the city’s 99-year-lease agreement with Infrastruc- dition it would be “subject to the satisfaction of the city of an
ture Ontario.
onerous environmental clean-up.”
Over the years Oshawa had conducted negotiations
Oshawa agreed to those conditions and the province subwith several developers interested in building hotels and/ sequently awarded the city the courthouse site, he points out.
or a convention centre, but none of these discussions went
Some of the elements of the remediation included on-site
anywhere until Atria came forward with its plan, says Tom treatment of contaminated groundwater and a two-stage
McIelwain, principal of Whitby-based Golder Associates, barrier system around the north, west and south sides of the
the lead consultants in the cleanup of 100 Bond, as well as courthouse property to prevent recontamination of the lands
the entire eight acres.
to the south and west. An inner barrier prevents contamiIn tracing the rather convoluted history of that remedia- nated water flowing onto the courthouse property.
tion, McIelwain explains the city acquired the entire cityA similar clean-up approach was used for the staged cleanblock site in 1985 in a land swap with General Motors as part up of the Atria site between 2007 and 2011, says McIelwain,
of a long-term downtown revitalization plan.
explaining that a very high barrier has to be attained in the
Although the manufacturer demolished the former plant remediation of lands slated for residential development.
to the floor slabs, the city subsequently identified contami“I think they (city council) were proven correct as the
nation of the soil and groundwater from trichloroethylene courthouse and YMCA buildings are developed and the
(TCE), a common industrial solvent degreaser widely used at foundation is being poured for Atria’s building,” says policy
the plant, as well as by metals such as lead and cadmium. Ten services manager Warren Munro, in a reference to the 1985
years later, the upper two metres of fill across the site was exca- land acquisition.
vated, including removing the demolition rubble and metals.
But that property isn’t the only brownfield site that has been
However, the groundwater remained impacted by the converted into other uses, says Munro, pointing to the nearby
TCE across the site.
Costco, the GM Centre sports and entertainment venue and a
When the new Oshawa YMCA was constructed in 1998, planned 2,200-unit Medallion Homes development.
a deep foundation drainage system was installed to collect
The stimulus for those projects, at least in part, is the
groundwater, including the residual TCE contamination.
Brownfield Renaissance Community Improvement Plan
“This (the system) safeguards the facility against environ- which provides a series of grants and tax incentives for projmental impacts affecting users,” says McIelwain, explaining ects throughout urban Oshawa — not just the downtown —
the YMCA was made fully aware that the site was somewhat south of Highway 407.
contaminated by the TCE.
“It (the plan) sends messages that we’re open for business,”
Infrastructure Ontario was considerably more demand- says Munro.
ing when considering the property as the location for a
Implemented in 2005 and originally set to expire at the
consolidated courthouse that would replace multiple courts end of this December, the plan was recently extended to 2020,
throughout Durham Region. The site was chosen on the con- says Munro.
ENVIRONMENTAL ENGINEERS
Specialists In:
Ÿ Designated
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Substances Surveys for Renovation, Demolition
and Construction Projects
Ÿ Asbestos and Hazardous Materials Surveys and Abatement
Design and Supervision
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Ÿ Air Quality Testing
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and Risk Assessment
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121 Granton Drive, Suite 12
Richmond Hill, Ontario L4B 3N4
Tel: 905.882.5984
Web-Site: www.arcadis.com
E-Mail: [email protected]
[email protected]
280 Commissioners Street
Toronto, ON M4M 1A4
Phone: 416-466-3800
Fax: 416-463-3633
Sean Teperman Consulting Corp.
www.tepermandemo.com
[email protected]

160 Vinyl Court - Daily Commercial News

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