HomeMy WebLinkAboutCOR-18-002 - Encroachment Request - 345 King Street WestREPORT TO: Committee of the Whole
DATE OF MEETING: May 7, 2018
SUBMITTED BY: Lesley MacDonald, City Solicitor, 519-741-2200 x7267
PREPARED BY: Lesley MacDonald, City Solicitor, 519-741-2200 x7267
WARD INVOLVED: Ward 9
DATE OF REPORT: May 2, 2018
REPORT NO.: COR-18-002
SUBJECT:Encroachment Request – Shoring Tiebacks – Below Halls
Lane and King Street West – Perimeter Developments - 345
King Street West
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RECOMMENDATION:
That the Mayor and Clerk be authorized to execute an Encroachment Agreement,
satisfactory to the City Solicitor, with the developer of the property municipally
known as 345 King Street West to permit shoring and the installation of tiebacks
below Hall’s Lane and King Street West.
BACKGROUND:
Shoring and tiebacks are required to allow for the construction of two-levels of
underground parking for a new six storey office building in the downtown core located
at 345 King Street West.
REPORT:
Perimeter Development requires the ground to be temporarily supported during the
excavation and construction of the building foundation, otherwise known as shoring.
Perimeter Development will construct two-levels of parking below ground.
A series of 1.0m diameter holes will be drilled every 3.05 m along the property line of
King Street West and Halls Lane. These holes will not encroach on city property. A
structural steel pile will be placed in each hole and filled with 20 Mpa concrete. As the
excavation progresses, lagging (wood boards) will be installed between the piles.
Approximately 3.0m below the street grade, a row of tiebacks will be installed. A
tieback is a structural element installed in the soil to transfer applied tensile load into
the ground. The tieback in a form of stranded wire is drilled into the soil under King
Street and Halls lane at a 30 degree angle. The horizontal encroachment on King
Street is approx. 8.9 m and approx. 10.1 m on Halls Lane. The tiebacks will run the full
length of the property line on King Street and Halls Lane.
*** This information is available in accessible formats upon request. ***
Please call 519-741-2345 or TTY 1-866-969-9994 for assistance.
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Engineered drawings were circulated to staff and external utility companies.
KW-Hydro will permit the developer to install tie-backs under the existing duct
structure, provided a minimum distance of 1m is maintained from the bottom of the
structure, but not under the existing pull box.
Prior to excavation, the shoring permit must be approved by the Building Department.
If shoring works cease, a cost estimate must be approved by City staff to bring the site
to a safe condition; in addition, a letter of credit must be posted according to the City’s
Letter of Credit Policy.
There is to be no damage to City infrastructure and as assurance, CCTV of the existing
sanitary and storm sewers will be undertaken pre-tieback and post-tieback installation.
An “as-built” drawing will be provided by the developer to City staff, showing the
locations of tiebacks in relation to existing municipal sanitary, storm and watermain
infrastructure for the City’s future reference when working on City infrastructure.
During the installation of the shoring and tiebacks, there will be no impact on vehicles
or pedestrians using the street and/or sidewalks. Once the foundation of the new
building has been completed the tiebacks will no longer be required (abandoned) and
will not be structurally supporting any building. The tiebacks can be removed at any
point for future work under the roadway.
ALIGNMENT WITH CITY OF KITCHENER STRATEGIC PLAN:
The recommendation outlined in this report supports the achievement of the City’s
strategic vision through the delivery of core service.
FINANCIAL IMPLICATIONS:
All legal fees associated with the application of this encroachment has been paid. The
processing fee of $235 will become payable after Council approval.
COMMUNITY ENGAGEMENT:
INFORM – This report has been posted to the City’s website with the agenda in
advance of the Council meeting.
ACKNOWLEDGED BY: Victoria Raab, General Manager of Corporate Services
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