HomeMy WebLinkAboutDSD-2024-359 - Draft Heritage Impact Assessment (HIA) Addendum - 1385 Bleams RoadStaff Report
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Development Services Department www.kitchener.ca
REPORT TO: Heritage Kitchener
DATE OF MEETING: September 3, 2024
SUBMITTED BY: Garett Stevenson, Director of Development and Housing Approvals,
519-741-2200 ext. 7070
PREPARED BY: Deeksha Choudhry, Heritage Planner, 519-741-2200 ext. 7602
WARD(S) INVOLVED: Ward 5
DATE OF REPORT: August 12, 2024
REPORT NO.: DSD -2024-359
SUBJECT: Draft Heritage Impact Assessment Addendum
1385 Bleams Road
Construction of a 3 -storey building with 8 Units
RECOMMENDATION:
For information.
REPORT:
The Planning Division is in receipt of a draft Heritage Impact Assessment (HIA) Addendum
dated August 22, 2024, prepared by CHC Limited, regarding a proposal to redevelop the
subject property municipally addressed as 1385 Bleams Road (Attachment A). The subject
property is designated under Part IV of the Ontario Heritage Act through designating By-
law 1987-309. The subject property includes the building commonly known as the
"Williamsburg School", one of the last remaining buildings of the former Hamlet of
Williamsburg.
A previous redevelopment proposal for the subject property was presented to Heritage
Kitchener at its March 7, 2023 meeting. The proposal included the construction of eight
(8), three-storey townhomes on the western half of the property, towards the rear of the
designated building (Fig. 1). To facilitate the proposed development, a Zoning By -Law
Amendment application was submitted and approved in 2023, with the HIA receiving
approval on June 12, 2023.
*** This information is available in accessible formats upon request. ***
Please call 519-741-2345 or TTY 1-866-969-9994 for assistance.
GLEAMS ROAD
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Figure 1. The proposed development as presented to Heritage Kitchener at its March 7, 2023, meeting.
There has been a change in the proposed development, due to which an HIA Addendum
was required. The new development contemplates development on the western portion of
the property includes the construction of a three-storey stacked townhomes with eight (8)
units and eight (8) parking spaces (Fig. 2). The parking will be located at the rear of the
building. `Block A' will be located 29.7 m from the existing heritage resource with the
driveway located 21.9 m from the existing heritage resource.
BLEAMS R O A D
Figure 2. Revised proposed development on the subject property.
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Figure 2. Revised proposed development on the subject property.
Since the proposed development has changed and is a departure from what was
previously presented to Heritage Kitchener, this addendum is being presented to Heritage
Kitchener and staff are seeking the committee's input. This input will be taken into
consideration as part of the staff review of the HIA. This addendum is in its draft stage and
has not been approved by the Director of Housing and Development Approvals. The
applicant's heritage consultant will attend the September 3, 2024, meeting of Heritage
Kitchener to answer any questions the Committee may have. A motion or recommendation
to Council is not required for the September meeting.
STRATEGIC PLAN ALIGNMENT:
This report supports the delivery of core services.
FINANCIAL IMPLICATIONS:
Capital Budget — The recommendation has no impact on the Capital Budget.
Operating Budget — The recommendation has no impact on the Operating Budget.
COMMUNITY ENGAGEMENT:
INFORM — This report has been posted to the City's website with the agenda in advance of
the Heritage Kitchener committee meeting.
PREVIOUS REPORTS/AUTHORITIES:
Draft Heritage Impact Assessment (HIA) — 1385 Bleams Road — Proposed
Construction of 8 Three -Storey Townhomes, DSD -2023-080
APPROVED BY: Justin Readman, General Manager, Development Services
ATTACHMENTS:
Attachment A — Draft Heritage Impact Assessment Addendum — 1385 Bleams Road
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OZA Inspections Ltd.
A Member Company of the OZA Group
August 20, 2024
M1
1385 B eams Road
Kitchener, ON N2E 3X7
202-400 Jones Road
Stoney Creek, ON L8E 5P4
Toll Fri`e 1-800-667-8263
Tel: (905) 643-1074
Fax: (905) 643-9040
estimating*,ozainspections.com
www.ozainspections.com
Re: Preliminary Construction Vibration Assessment
1385 Bleams Road
Proposed Stacked Townhouse Block
City of Kitchener
Our File No. 23355
INTRODUCTION
In accordance with your request and the requirements imposed by the City of
Kitchener for site plan approval, OZA Inspections Ltd. has conducted a preliminary
vibration assessment with respect to the proposed development and the potential
impact of construction vibrations relative to the existing `Heritage' designated
buildings located at 1385 Bleams Road. A vibration monitoring assessment has been
recommended as part of the Heritage Protection Plan for this property (CHC Limited,
May 30, 2023, Addendum July 18, 2024). This assessment shall specify monitoring
requirements and associated vibration controls as necessary towards the preservation
of the subject property, based on the current site plan.
Prediction models were developed based on conventional types of machinery used in
excavation, grading and servicing. Standard equipment was modeled separately to
assess the impact. Predicted vibration levels were compared with thresholds for
potential building damage to determine the required safe set -back distances.
Vibration impact shall be controlled through the implementation of recommended
mitigation measures and vibration monitoring for key operations.
OZA Inspections Ltd.
1385 Bleams Road, Kitchener August 2024
CONSIDERATIONS
Development of the subject site will include, but not necessarily be limited to:
excavation for construction and servicing of the proposed 3 -storey, 8 -unit stacked
townhouse block, excavation for driveway and parking lot construction, and
backfilling and compaction associated with these activities. Driveway and parking lot
construction west of the existing heritage buildings (former Williamsburg schoolhouse
and batten wood shed) shall involve vibratory compaction of granular base and
asphalt. The new building is proposed in the west site area.
Based on our review of the Site Plan (Preliminary, Drawing No. A1.01, Orchard
Design Studio Inc. Project 15158, updated 2024-08-14), we estimate that the proposed
driveway construction is offset by 23± metres from the old schoolhouse building, the
proposed new building footprint is offset 30.5± metres. We note that the nearest part
of the proposed parking area is offset from the schoolhouse building by 20± metres,
the shed structure by 21± metres.
We have anticipated that construction activities for this project as described above will
involve the following conventional construction equipment:
• Bulldozers
• Excavators
• Compactors (vibratory drum roller and/or hoe-pac)
• Dump trucks
ASSESSMENT METHODS / DETAILS
For assessment of ground borne vibration impact, measurement of the Peak Particle
Velocity (PPV) is widely accepted as the best descriptor of potential for damage; pre -
construction assessment involves prediction methods in lieu of measurement.
The United States Department of Transportation has published procedures (Reference:
United States Federal Transit Administration, Transit Noise and Vibration Impact
Assessment, Report No. 0123, September 2018) for construction vibration prediction.
The reference values provided are considered a reasonable average based on a wide
range of site conditions. This procedure involves the use of these reference values at a
given distance, factored into a distance attenuation equation to calculate the PPV
value. These predicted values are then compared to appropriate criterion to assess
potential impact.
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OZA Inspections Ltd.
1385 Bleams Road, Kitchener August 2024
CRITERIA
This section forms a preliminary criteria guideline and the basis for the calculation of
the setback distances.
Currently there is not a universally accepted standard in Ontario for limiting vibration
relative to heavy construction such as grading, excavation and vibratory compaction.
Subsequently, vibration and loss control consultants rely on our expertise, and
interpretation of resources, such as international vibration standards. For specific
projects, many factors are typically considered, including but not limited to the
structural sensitivity and construction methods (source characteristics).
In general, more restrictive vibration limits are applied to vibration sensitive
structures, such as buildings designated under the Ontario Heritage Act, than limits for
modern buildings.
The previously referenced FTA procedures report suggests limits based on the
structure type; see Table 1 following:
Table 1: Construction Vibration Damage Criteria
Building Type
PPV
mm/s)
Reinforced concrete, steel or timber (no plaster)
12.7
Engineered concrete and masonry (no plaster)
7.6
Non -engineered timber and masonry
5.1
Buildings extremely susceptible to vibration damage
3.0
Other references, such as the City of Toronto Municipal Code (Chapter 363-5),
specify PPV limits with consideration of the corresponding frequency of the
construction generated vibration, with the lower thresholds applicable at frequency
levels of IOHz or less. Based on our extensive experience monitoring construction we
anticipate vibration frequency levels from conventional machinery measuring in the
20-50 Hz range for this project, well above the typical natural frequency of buildings
(3-11 Hz). Older `Heritage Designated' structures are often assigned lower criteria
regardless of favourable frequency and building condition. We note that the age of a
structure or the heritage designation does not necessarily mean that it is more
susceptible to vibration than other structure types. Structure condition should be
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OZA Inspections Ltd.
1385 Bleams Road, Kitchener August 2024
considered.
At the time of this report, condition survey documentation of the subject heritage
structures at 1385 Bleams Road was not available. Review of the aforementioned
CHC Limited Addendum to the Heritage Protection Plan indicates that these
structures are in good, sound condition; nonetheless, for the purposes of this
assessment and considering the heritage designation and age of these buildings, we
have conservatively modeled based on a restrictive 3.0 mm/s PPV value, typically
applied to buildings that are considered extremely susceptible to vibration damage.
ASSESSMENT
Table 2 presents the reference values used in prediction of the vibration levels with
respect to the proposed activities and anticipated machinery.
TABLE 2
Equipment Type
Reference
Distance (m)
Reference
PPV (mm/s)
Activity
Grading
Large Dozer
7.6
2.261
Grading
Small Dozer
7.6
0.076
Compaction
Vibratory Roller / Hoe-
ac
7.6
5.334
Excavation
Large Excavator
7.6
2.261
Hauling
Loaded Truck
7.6
1.930
Using these FTA reference values, we calculated the minimum separation distance at
which a level of 3.0 mm/s is predictable for each activity (source), without
consideration of site specific mitigation. The following equation was used:
PPVsource PPVRef (DR/D)" (mm/sec)
PPVRef reference value at 7.6m
DR reference distance (7.6m)
D Distance of machinery/activity to the receiver in metres
n value, for attenuation rate based on soil conditions
Factoring the Table 2 typical reference values for the various activities and factoring
competent soil conditions for this site (n = 1.3), set -back distances for the various
machinery types are presented in Table 3 following:
4
OZA Inspections Ltd.
1385 Bleams Road, Kitchener August 2024
TABLE 3
Required Minimum Separation Distance (m)
PPV
(mm/s)
Dozer Small
Dozer
Compactor
Excavato
r
Dump
Truck
3.0
6.5
<1
12
6.5
5.5
MITIGATION PROCEDURES
Setback distances outlined in Table 3 should be maintained for each of the identified
activities in order to control vibration to below PPV limits generally specified for
vibration sensitive structures. Based on the revised site plan (August 14, 2024),
construction operations will not encroach within ±20 metres of the nearest existing
heritage structure at 1385 Bleams Road. See Figure 1.
Predicted vibration levels indicate work can be carried out in a safe manner, without
implementation of a fulltime vibration monitoring program, as the proposed work is
outside the required minimum setback distances for the various construction vibration
sources.
We recommend vibration testing at the onset of key activity, specifically compaction
of backfill and/or granular for pavement base, to verify the accuracy of the reference
values used in determining the safe setback distances. Testing/monitoring of these key
activities shall serve to assess site specific machinery, and allow for additional
mitigation of vibrations, if necessary.
During the recommended test period, digital, tri -axial seismographs shall be used,
with sensors spiked at ground level, positioned in line between the nearest point of the
existing heritage structures at 1385 Bleams Road and the vibration source,
programmed to measure and record PPV in real time (see Figure 1).
Should testing confirm vibration levels consistent with the reference values used in
this assessment, further mitigation will not be required. In the event that any of the
tested activities produce levels approaching the recommended PPV limit used for
assessment purposes, additional vibration mitigation measures may be required.
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OZA Inspections Ltd.
1385 Bleams Road, Kitchener August 2024
In summary, the following mitigation measures are required:
• Application of the Table 3 minimum setback distances
• Site vibration testing at the onset of key activities to verify the accuracy
of the Table 3 set -backs
Supplementary mitigation measures, should actual site testing indicate higher than
predicted levels, may include but not be limited to the following:
• Use of equipment known to produce lower generating vibration where
set -back distances are not feasible, verified through site specific vibration
monitoring
• Use of smaller vibratory equipment, such as a 48 -inch drum versus a 60 -
inch drum roller, in low mode for granular compaction and asphalt
compaction
• Smaller excavators/bulldozers for grading and granular placement work
• Ongoing remote vibration monitoring with automated alert notification
capability for vibration levels approaching the specified threshold
CONCLUSION
OZA Inspections Ltd. has conducted a pre -construction vibration impact assessment
for the proposed 1385 Bleams Road stacked townhouse block development. Based on
modelling, work will not encroach within the minimum setback distances required for
vibration pertaining to heritage structures on the subject property. Therefore, specific
vibration controls are not required.
Initial testing of vibration levels from key construction operations will help ensure
safe management and subsequent protection of the nearby heritage buildings.
INDENMITY
The information and recommendations contained in this report represent our
judgement in light of the limitations and industry standards for the preparation of
similar reports. Judgement was exercised in gathering and analyzing the information
obtained and the compilation of our report. This report carries no guaranties or
warranties as to the structural competence of adjacent buildings. This report must be a
read as a whole.
Notwithstanding full compliance with the specifications of the project, approval of the
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OZA Inspections Ltd.
1385 Bleams Road, Kitchener August 2024
construction plan and the successful completion of the work, the Contractor shall be
solely responsible for any damage, direct or indirect, arising from the work and shall
hold OZA harmless from any costs, liens, charges, claims or suits, including the costs
of defence arising from such damage, real or alleged. OZA accepts no responsibility
for damages that may be suffered by any third parry as the result of decisions made or
actions taken based on this report.
Respectfully submitted,
OZA Inspections Ltd.
David Williams
Senior Vice President
OZA Inspections Ltd.
1385 Bleams Road, Kitchener
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FIGURE 1: VIBRATION ZONE OF INFLUENCE AUGUST 2024
OZA INSPECTIONS LTD 1385 BLEAMS ROAD HERITAGE STRUCTURES NTS
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OZA Inspections Ltd.
1385 Bleams Road, Kitchener August 2024
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FIGURE 1: VIBRATION ZONE OF INFLUENCE AUGUST 2024
OZA INSPECTIONS LTD 1385 BLEAMS ROAD HERITAGE STRUCTURES NTS
8
OZA Inspections Ltd.
1385 Bleams Road, Kitchener August 2024