City of Ottawa - Appendix C - Standard for Noise Barriers

Appendix C - Standard for Noise Barriers

1.0 Scope/ Objectives and Application
2.0 Sound Barrier Height and Location requirements to be Incorporated in Noise Study Report
3.0 Design
4.0 Materials
5.0 Installation and Construction
6.0 Masonry Walls
7.0 Fire Hydrant Access
8.0 Overhead High Voltage Lines
9.0 Other Considerations
10.0 Resonance (Drumming Effect)
11.0 Approval by the City
12.0 Installation

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This standard specifies requirements for design, material and construction of noise barriers as to complements the Environmental Noise Control Guidelines to which this standard is attached.

The use of this standard is expected to result in a higher quality noise barrier system, and lower capital and maintenance costs to both, the residents in the case of developer-constructed barriers, and to the City of Ottawa in the case of retrofit or capital works projects.

The following summarizes the basic principles previously adopted by the former Regional Municipality of Ottawa-Carleton (ROC) as well as new enhancements by the City:

To focus on meeting the acoustic criteria.
Allow the use of competitive products, and limit the possible product monopoly that may develop.
Not restrict the industry from developing various acceptable design alternatives.
Encourage the use of friendly, but durable, products that homeowners can relate to or maintain, where necessary.
Provide realistic warranties that focus on the barrier system, and not only on the panels or materials.
Relate the barrier standards to the various current City Noise Guidelines Control Guidelines.
Provide effective implementation procedures for barrier design and installation.

This standard is subject to periodic review, and suggestions for improvement may be referred to the appropriate City office.

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1.0 Scope/ Objectives and Application

1.1 Scope/ Objectives

This standard provides outline specifications for the design and installation of noise barriers approved or constructed by the City of Ottawa. The specific requirements described in this standard are not to be considered all inclusive. Any new design, material or installation technique not specifically addressed in this standard should be evaluated with the general fundamentals of acoustics, durability, safety, and functionality in mind.

This standard applies to noise barriers constructed by the City in connection with transportation corridors and transit corridors capital works projects that may be subject to the EA process and to retrofit noise barriers. The standard also applies to noise barriers approved by the City in connection with new development projects subject to the City approval process.

The objective of this Standard is to set uniform design and construction guidelines for the approval and installation of durable and high quality noise barrier systems, with a life expectancy of at least 20 years, that will result in lower capital and maintenance costs to the residents, in the case of developer constructed barriers, and to the City in the case of noise barrier retrofit or capital works projects.

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1.2 Application of the CSA Standard for Noise Barriers within Projects in the City

Certification organizations, such as the Canadian Standards Association, as accredited by the Standards Council of Canada, have their own criteria and procedures for certification services. CSA provides certification services for manufacturers who, under license from CSA, wish to use the appropriate registered CSA marks on certain products of their manufacture to indicate conformity with CSA Standards.

It should be noted that the CSA Standard for Noise Barriers is neither binding on the manufacturers of noise barriers nor on the approval agencies. The CSA Standard was developed to promote standardization of the noise barrier industry across the country with a view to developing a safe, durable and effective product.

It is the intent of the City, however, to accept noise barriers bearing the CSA mark as meeting the City Noise Barrier Standard in addition to other noise barrier systems that meet this City Standard.

The objectives of the Standard will, therefore be as follows:

To endorse noise barrier systems utilizing materials bearing the CSA mark.
To also consider noise barrier systems not bearing the CSA mark which are manufactured to either meet the City Standard or have proven themselves to be worthy of consideration based on successful installations that "stood the test of time".
To encourage more local manufacturers to develop a variety of quality and safe products that meet the City Standard, and ultimately the CSA Standard.
To provide the necessary flexibility in meeting site specific challenges or problems with the use of qualified and professional expertise in the areas of structural and geotechnical engineering and landscape architecture fields.
To provide integrated solutions to environmental noise issues and their controls in accordance with other City noise policies and guidelines.

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2.0 Sound Barrier Height and Location requirements to be Incorporated in Noise Study Report

For new land use planning, the City of Ottawa discourages the use of sound barriers especially along City roadways and they shall only be used as a last resort where all other mitigation measures are demonstrated through the necessary studies to be not feasible.

Section 1.6 in this guideline document provides information on noise study requirements which include some information on sound barriers.

Should the use of sound barriers be found necessary, the following site specific information and details should be included in the relative noise study:

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2.1 Noise Barrier Details

Typical and all worst case cross sections (and additional cross sections as may be necessary) at a reasonable vertical and horizontal scale should be provided to clearly illustrate the proposed berm and/or wall configuration in relation to the future grade at the Outdoor Living Area based on the proposed Lot Grading Plan (for a Noise Feasibility Study, use the existing grades. For a Detailed Study, existing and proposed future grades at the site must be indicated). Cross sections and/or the data in the report must include the location of the noise source, the location and elevation of the receiver, top elevation of the noise barrier, ground elevations of the berm, berm slopes, sidewalks, boulevards, ditches, roadway or railway elevations and property limits of the lands in question. Cross sections must provide all information (distances and heights) required to calculate the sound level reductions due to barriers.
The location of the cross sections must be indicated on a copy of the submitted plan. Preliminary grading plans should identify and make reference to all information shown on the cross sections (Corridor ground elevations, ground elevation at noise receivers, ground and top elevations of the berm, elevations of the rear yards, sidewalks, ditches, boulevards and ground elevation at the building face).
Height of receiver to be used is 1.5m above the ground at a point located 3.0m from the rear and/or closest wall within the identified Outdoor Living Area of the dwelling unit. If the house or development design shows other alternative locations for the Outdoor Living Area, such as a common Outdoor Living Area, then the receiver location(s) should be shown on the applicable project drawings.
Other suitable and acoustically effective Outdoor Living Area locations may be selected in consultation with the City of Ottawa based on site specific cases.
The minimum acceptable barrier wall height is 2.2m for a flat grade case. In all cases, the noise barrier wall for new development should not exceed 2.5m in height unless approved by the City of Ottawa.
Should the result of the analysis indicate the need for a barrier up to 2.2m high to protect the Outdoor Living Area, there is no need to consider the use of an additional setback to accommodate the planned noise barrier. For situations where the barrier wall height exceeds 2.2m, the following table provides guidance on the additional setbacks required to accommodate a base berm and a wall on top of the berm. The berm must be placed entirely within the property line of the proposed development. The City will not accept any berming on its r.o.w. Maintenance of the barrier, including the side facing the road, is the responsibility of the property owner.

Additional Setbacks Required for Berms

Berm Height	Additional Setback
0.5m	3.5m
1.0m	6.5m
1.5m	9.5m
2.0m	12.5m
2.5m	15.5m

The details related to the berm are discussed in the clauses to follow.

For single family, detached or semi-detached and townhouse residential development, a minimum of 6.0m depth of a relatively flat rear yard is required as measured from the rear face of the building and containing no slope in excess of 4%.
For roadway and bus Transitways, a maximum slope of 3:1 will be required for any earth-work (i.e. berm) adjacent to the boulevard. Slopes steeper than 3:1 will be tolerated on the lot side of the earthwork by the use of retaining walls, where accepted by the City of Ottawa for drainage and landscaping (the 3:1 ratio on the lot side may only be modified at the discretion of the City). For railways, the slope on the railway side should be 2.5:1.
In cases where the attenuation facility is interrupted, barrier returns or parallel screens may be required and the detailed design and calculations of the treatment in such cases will have to be incorporated into the acoustical report. The report and the grading plan must include a detailed plan and appropriate cross sections of such cases.
The location of a proposed noise barrier when located adjacent to a City Road or Transitway or a railway right-of-way should be based on the following principles:

A noise barrier wall should be located entirely on the development under consideration; on the side of the property line which is on private property. Its location should be a minimum of 0.3m from the City right-of-way. The location of the noise barrier wall should take into account requirements for future roadway widening.
The barrier berm should be located entirely on the development under consideration on the side of the property line which is on private property. Only in exceptional cases, the City may accept a portion of the berm and the portion of the berm on the City or railway company right-of-way be subject to acceptance and approval by the authorities having jurisdiction prior to making any commitment to this effect. The design of the berm could be affected by future roadway widening. The proponent and/or their Consultants should prepare the necessary details related to the berm design and address all matters of concern such as compaction, grade elevations, drainage, safety, cover and landscaping, side slopes, maintenance,�etc.
In all cases, the noise barrier wall should be located in an approved location relative to the berm. Only in exceptional cases, the portion of the berm facing the road transportation facility on private property may have to be dedicated to the City at no cost where requested by the City.
Where a barrier is required, the receptors should be located within its acoustical �shadow zone�.

The maximum height of berm/barrier allowed is to be determined in each case by the City of Ottawa.
For roadways and bus Transitways, the noise barrier shall be located to conform to the ultimate roadway width and cross section to prevent future barrier relocation.
In general, the maximum combined barrier height (i.e. berm and wall) above the road or bus Transitway centre line or the ground-oriented Outdoor Living Area should be 4.5m. Otherwise, the proponent should investigate other noise control options and lot grading possibilities. For railway corridors, the minimum acceptable heights of the berm-wall combination should be consistent with the railway requirements for noise and safety.

All sound barriers must conform to the City�s Standards for Noise Barriers.

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2.2 Location of Sound Barrier

Information on noise barriers, berms and berm/wall combinations must include location and height of the barrier relative to sea level.

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2.3 Material

Type and surface density of the barrier should be specified and the manufacturer and/or supplier described, if known. The City recommends that the barrier design parameters be similar to those developed by the City with respect to structural specifications, wind loading, footing design, reinforcement, rust protection, warranty requirements,�etc.

In Particular, noise barriers should have the following characteristics:

Surface mass density not less than 20 kg/sq. m (4 lbs/sq.ft.) in order to ensure that the sound component transmitted through the barrier material is at least 10 dB below the sound component diffracted across the top of the barrier.
Have no holes or gaps.
Interrupt the line-of-sight drawn from the source to the receiver, i.e. the receiver should be in the acoustical �shadow zone� of the barrier.
Provide the desired minimum sound level reduction and protect all receiver locations (3m from building face closest to transportation facility) subject to the guidelines.
The noise barrier is continuous or is turned through appropriate angles away form the source at both ends to protect the receivers from the flanking sides.

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2.4 Landscaping and Access

Where the use of a sound barrier is approved by the City, landscaping for aesthetic purposes will be required to the satisfaction of the City. In addition, City policies pertaining access to roads and transit systems must be fully considered as part of the barrier design.

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3.0 Design

The details presented in this Standard refer to noise barriers as a total and integrated system of various components including the base berm, if any, the wall, and all other associated components, as defined herein.

All individual components shall be designed to be capable of being assembled on site and to conform to the drawings and specifications. The panels to also be designed to facilitate ease of on-site replacement.

The design of the system shall be site-specific and in accordance with the Canadian Highway Bridge Design Code (CHBDC), prepared by qualified Professional Engineers and Acoustic Consultants. Input will be required from Geotechnical and/or Structural Engineers.

The noise barrier shall be designed to withstand all possible forces and loads encountered during the design life of the barrier and remains serviceable. The design shall be site specific with reference to the wind pressure, earthquake load, freezing depth and soil conditions.

The foundation of the barrier wall shall be designed to be founded on undisturbed soil, and at required depth of embedment as per the design requirements, but not less than the depth of freezing of the area.

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3.1 Acoustics

3.1.1 Material Density/Sound Transmission Class (STC) Requirements

For a panel to be qualified as a sound barrier material, one or more of the following conditions should be met:

The surface density of the panel material to be not less than 20 kg/sq.m.
The Sound Transmission Class (STC) of the panel material to be 20, or greater, when tested in accordance with ASTM-E90 (a test report to be submitted for approval).
The Sound Transmission Class (STC) of the panel material has historically been demonstrated to be 30 or greater.

In addition, sufficient measures are to be taken to prevent drumming of the panels caused by wind or ground vibration.

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3.1.2 Noise Reduction Coefficient (NRC)

If the noise barrier system is specified by the Acoustical Consultant to be sound absorptive, the barrier panels should be tested to determine the Noise Reduction Coefficient (NRC) in accordance with ASTM-C423. A panel or an assembly of panels should be tested, as required, in accordance with the ASTM Procedures for free-standing screens.

The use of alternate methods of providing the necessary sound absorptive qualities by a barrier system should be subject to special approval by the City based on qualified technical data to be submitted by the proponent. This may include the use of double walled noise barrier panels (sandwich construction with perforated facing) or the use of substantial landscaping designs along the barrier faces by a Landscape Architect.

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3.2 Expansion Joints

The noise barrier is to be designed and installed so as to accommodate movement of the noise barrier panel during the weather cycle without placing undue stress on any structure and the noise barrier installation, or reducing acoustical attenuation. The joints in the noise barrier are to match the size and location of the structure joints.

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3.3 Height

The noise barrier system design should provide details of methods and materials to be used to accommodate varying wall heights above the top of footing.

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3.4 Panel Orientation

Noise barrier elements should be designed and oriented to minimize entrapment and ponding of water, and accumulation and infiltration of dirt and debris inside and on any surface of any component. Corrugated, or ribbed panels, should be mounted such that the features are oriented vertically.

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3.5 Panels with Fire Hose Access

Noise barrier panels with fire hose access openings, if required, shall be designed with additional reinforcement and protective coating around the opening, as necessary, to maintain structural integrity.

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4.0 Materials

4.1 General

For materials, not specifically included in this section, the manufacturer should demonstrate to the City that the material has a minimum predicted maintenance free lifespan of 20 years.

All materials should have a flame spread classification less than, or equal to, 140 and smoke developed classification less than, or equal to, 180 when tested in accordance with the ULC standards.

Metal and non-metallic components of noise barrier systems, including their performance, such as corrosion and weathering, to be in accordance with the applicable CSA, ASTM, CAN/L1LC, ULC, CSA/CAN and ANSI standards.

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4.2 Coatings

Coatings refer to all paints, stains and laminates. All coated components to be rated for accelerated weathering. All coated steel components to be resistant to corrosion.

Components which are hot dip galvanized, or coated with a polyvinyl chloride (PVC) plastisol using an epoxy primer using no adhesives for bonding, need not have accelerated weathering test data

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4.3 Concrete Panels and Posts

4.3.1 Cast-in-Place

Cast-in-place concrete to conform to the requirements of the CSA Standards.

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4.3.2 Precast

Precast concrete to conform to the requirements of the CSA Standards.

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4.3.3 Steel Reinforcing

All steel reinforcing to conform to the requirements of the CSA Standards. The bars to be free from rust, scale, or other substances, that will prevent bonding.

All reinforcing bars should be epoxy coated, conforming to ASTM Standards. The concrete cover over the steel reinforcing should meet the requirements of the CSA Standards and in no case should it be less than 50mm.

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4.4 Bare Metal Components

All bare metal components to be either fabricated of nonferrous materials, or hot dip galvanized after fabrication, according to the requirements of CSA Standards. All welding to conform to CSA Standards.

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4.5 Composites and Metal Panels

Steel panels, exposed to traffic and snow removal operations, to be minimum nominal 0.91 mm galvanized steel (20 gauge). All other panels to be of minimum nominal 0.76 mm galvanized steel (22 gauge). All steel sheeting components to be coated with a material meeting the requirements of this standard.

Acceptable products include galvanized panels and then coated with an organic polyvinyl chloride (PVC) plastisol using an epoxy primer using no adhesives for bonding. The coating system thickness must be 200 um on the surfaces exposed to traffic and snow removal operations, and 100 um thick on all other panel surfaces.

Pop-rivets shall be either aluminum, with an aluminum mandrel, or aluminum, with a stainless steel mandrel.

Other composites or metal panels, such as aluminum, may be used as panels for sound barriers, provided that such products are corrosion resistant and meet the acoustic and other performance criteria in this Standard.

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4.6 Sound Absorptive Quality

If the noise barrier system is specified by the Acoustical Consultant to be sound absorptive, the average Noise Reduction Coefficient (NRC) shall be not less than 0.70 (70%). Sound absorptive materials used to fill cavities in double walled noise barrier systems, to increase sound absorption, shall be semi-rigid type.

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4.7 Wood Components

All wood products to be made out of graded lumber (conforming to National Lumber Grading Association or Standard Grading Rules of Canadian Lumber 2000) and to be either naturally resistant to decay for a minimum of 20 years, or to be pressure treated. The panel must be composed of tightly fitted wood boards so as to avoid warping, splitting and loosening of particles, knots and imperfections. All boards must be tightly butted and secured.

The use of board-on-board panels to meet the stated density/acoustic criteria is acceptable provided that the boards are thoroughly secured. In addition, board-on-board panels shall have tightly butted joints that are staggered, with provision to allow for expansion/contraction, and for making the necessary field adjustments (e.g. for tightening up of developed gaps), where required.

The use of Tongue and Groove, and V-joints for joining panels is acceptable provided that the tongue or V -joint extent is not less than 19mm (3/4") long.

Nails, and other fastening devices, must be either hot dip galvanized steel, or made of nonferrous or stainless steel.

When there is ground contact with wood, the wood must be pressure treated and cut ends to be treated also, or protected from moisture penetration.

For wooden noise barriers, the following are the minimum acceptable features to qualify as an acceptable noise barrier system:

All wood shall be selected for good appearance and free of defects and large/heavy knots. In addition, all torn grain and surface stains shall be eliminated by appropriate surface refinishing.
All skirts, coming in contact with the ground/soil, shall be pressure treated with finished cut edges treated or protected from moisture penetration, and to be buried 100 to 150mm below the finished ground level.
All exposed panels to be dressed with beveled edges on both sides.
All wooden posts (metal posts are also acceptable) to have minimum dimensions of 140 x 140mm, or larger, as required by the governing code, dressed to pattern.
Double posts are required on all directional changes greater than 20�.
Install coping on top of panels using one piece wood (or other acceptable metal products)
The use of decorative elements such as pilasters, curved (scalloped) top rail, post caps, wood designs, etc. is preferable. In all cases, the decorative elements should not affect the minimum barrier height requirements, the density, or any other acoustic/structural requirements.
Wood, and/or metal frames, to be used to support the wood panels in place, and to be designed to allow expansion/contraction of the wood panels/elements, and for making the necessary field adjustments, where required.
All metal components, if any, used in a wooden sound barrier to conform to the metal or steel component specifications in this Standard.

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4.8 Brick

All bricks used to be in accordance with the CSA standards.

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4.9 Granular Material

All granular materials shall be free from deleterious materials, debris and organic materials. When used, it shall be compacted to 98% of Standard Proctor Dry Density.

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5.0 Installation and Construction

All work and noise barrier materials for specific installations are subject to field certification by the design professionals to ensure adherence to the requirements in this specification.

All materials delivered to the construction site should be visually inspected by the owner, and/or their representative, for proper dimensions, cracks, voids, surface defects, inconsistency in colour and texture, and any other damage or imperfections.

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5.1 Height and Alignment

The noise barrier to be constructed to the height and alignment as specified by the Acoustical Consultant. The minimum specified height of the noise barrier to be maintained at all times.

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5.2 Footings, Posts and Panels

The foundation, footing and post design, shall meet the objective of constructing a durable sound barrier that meets or exceeds the objectives of this Standard of a 20-year life expectancy and the set minimum guarantee of 5 years for material and installation of the noise barrier system.

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5.2.1 Footing

The footing shall be founded on undisturbed soil at the design embedment length as required but shall be minimum below freezing depth of the area. The founding surface shall be confirmed by a Geotechnical Engineer. All the soft spots to be removed and bottom of the footing protected from freezing. In case of solid rock encountered at a depth less than the freezing depth, foundation shall be carried minimum 300mm in the rock. The concrete of footing shall be as follows:

Minimum 28 days compressive strength to be 20 Mpa
Ready mix concrete or site mix concrete to confirm CSA-A23.2
All site placed concrete to be protected from freezing and to be protected in excessive summer temperature from drying.
The concrete in the footing shall be cured for a minimum period of 5 days before the installation of panels.

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5.2.2 Footing in Earth

If drilled footing is used, it shall be cast entirely against undisturbed soil. Footing other than drilled caisson to be formed and the excavation shall be backfilled with granular material. The backfilled material to be compacted to 98% Standard Proctor Dry Density of the granular material.

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5.2.3 Footing in Rock

When rock is encountered with in the excavation depth of the footing, the footing depth to be embedded minimum 300 mm into the solid rock.

All excavation into rock shall be back filled entirely with concrete. The excavation above the top of rock may be formed to the required dimensions and the remainder of the excavation backfilled with granular materials.

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5.3 Post

The barrier shall be constructed to the line and grades specified with the tolerance of � 10mm. The post shall be plumb within a tolerance of � 10mm in 5m. In all cases for wood posts, the minimum dimension shall be 150mm square.

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5.4 Panels

The profile of the barrier shall be installed to match the ground profile up to the maximum grade specified on the drawings. To accommodate ground profiles greater than the maximum grade, the barrier shall be stepped in accordance with manufacturer�s recommendations.

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5.5 Site Grading and Preparation

Earth grading and berm construction associated with the barrier installation shall be completed to within 25mm of the proposed elevation of the bottom of the barrier. Grading shall be completed and approved prior to construction of the barrier footings.

To prevent openings from occurring under the barrier an additional timber, not less than 5mm x 20mm in section, shall be securely fastened horizontally to the bottom of the barrier, and shall extend the full width of each barrier panel between adjacent vertical posts. This additional timber shall be buried to a depth equal to one-half its width during the final grading operation. Earth and pavement grading shall be sloped at a minimum of 2% and a maximum of 50% away from the barrier.

Frozen earth shall not be used for embarkment. Where imported fill is required for backfill or for minor grading, the fill material should be comprised of granular material, select sub-grade material, or other approved fill and to be compacted to at least 98% Standard Proctor Maximum Dry Density (SPMDD). All graded earth to be compacted to at least 98% Standard Proctor Dry Density.

The earth area surrounding the barrier wall shall be sloped away in order to prevent water ponding and water filtration to the barrier footings.

Changes in alignment to occur at the posts, by suitable means, to avoid acoustical degradation.

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6.0 Masonry Walls

Masonry walls to be installed in accordance with the requirements of AASHTO Guide Specifications for Structural Design of Sound Barriers.

Bricks to be installed on a suitable foundation not less than 500 mm above the final groundline.

The top row of all masonry walls and posts to be protected with coping and/or flashing.

Mortar used to set the bricks, shall be in accordance with the CSA Standards.

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7.0 Fire Hydrant Access

When the installation of a noise barrier interferes with the access to existing, or proposed fire hydrants, the noise barrier installation should include fire hose access openings and associated identification signs. Location and demand for these openings to be established in cooperation with the local fire department.

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8.0 Overhead High Voltage Lines

Where the potential of arcing exists, due to the close proximity of existing overhead high voltage lines, each metal panel and girt must be grounded in accordance with CSA Standards and the local Hydro/Utility company.

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9.0 Other Considerations

9.1 Aesthetics

The design of noise barriers should also have regard for the following:

The applicable urban design guidelines and landscaping requirements.
Drainage, grading, landscaping design and aesthetic principles.
The design of the barrier should be complimentary with nearby existing barriers.

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9.2 Landscaping

Soft landscaping, that could include trees and vines, to be included in all barrier projects.

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10.0 Resonance (Drumming Effect)

To avoid excessive resonance by certain noise barrier wall materials, such as metal panels, the barrier system to be designed to reduce this phenomenon by acceptable means such as the use of additional stiffeners, the application of noise damping compounds, sandwich construction, etc.

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11.0 Approval by the City

11.1 Noise Barrier System

In order for the noise barrier system design, and materials, to be qualified and be considered for approval, for installation at a specific site, the submission should provide the following:

The trade name of the product, if applicable.
The manufacturer's name and address.
Certification by a Geotechnical Engineer (calculations may be requested).
Certification by a Structural Engineer (calculations may be requested).
Detailed drawings of the entire noise barrier system and all its components.
general statement as to the composition of the materials.
Specifications regarding installation requirements as well as sequence of construction:
Noise Reduction Coefficient (NRC) report if the noise barrier is to be considered as sound absorptive; if required by the noise study.
Sound Transmission Class (STC) and/or the material surface density.
Detailed material specifications.

Any new design, material or installation technique for a noise barrier system will be evaluated for acceptability of use in the City with a view to safety, durability, functionality and cost effectiveness.

The design drawings and calculations shall be signed, sealed and dated by Professional Engineer(s) licensed in the area of expertise for which the approval is being sought.

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11.2 List of Approved Suppliers

The City will establish a list of approved suppliers of noise barrier systems which will be periodically reviewed and updated by City staff.

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12.0 Installation

This section deals with the installation of noise barriers, including design, submission, approval, construction and completion of the contracted work.

The following subsections briefly describe the minimum required data, and specifications, to be completed by the proponent in order to obtain approval from the City:

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12.1 Submittals

The following documents shall be submitted to the City for approval for each noise barrier wall project:

Shop drawings, signed and sealed by a qualified Professional Engineer licensed by the Professional Engineers of Ontario, showing the details of noise barrier system components, including material specifications.
Structural drawing(s), signed and sealed by a qualified Professional Engineer licensed by the Professional Engineers of Ontario, showing foundation details and specifying design criteria, climatic design loads, as well as applicable geotechnical data used in the design.
Layout plan, and wall elevations, showing proposed colours and patterns.
A covering letter stating deviations or exceptions to the City Standard and the reasons/justification for the deviations.

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12.2 Site Preparation and Grading