PG1909-REP.01.CDS-DG-SM.July 31 09

GeotechnicalEngineering

EnvironmentalEngineering

Hydrogeology

GeologicalEngineering

Materials Testing

Building Science

Paterson Group Inc.Consulting Engineers28 Concourse Gate - Unit 1Ottawa (Nepean), OntarioCanada K2E 7T7

Tel: (613) 226-7381Fax: (613) 226-6344www.patersongroup.ca

patersongroup

Geotechnical Investigation Update

Proposed Building271 West Hunt Club Road

Ottawa, Ontario

Prepared For

Ottawa Humane Societyc/o MHPM

July 31, 2009

Report PG1909-1

paterson Geotechnical Investigation UpdateOttawa Kingston North Bay Proposed Building

271 West Hunt Club Road - Ottawa

Report: PG1909-1

July 31, 2009 Page i

TABLE OF CONTENTS

PAGE

1.0 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2.0 PROPOSED DEVELOPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

3.0 REVIEW OF AVAILABLE INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . 2

4.0 DISCUSSION

4.1 Geotechnical Assessment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

4.2 Site Grading and Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

4.3 Foundation Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

4.4 Design for Earthquakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

4.5 Slab on Grade Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4.6 Pavement Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

5.0 DESIGN AND CONSTRUCTION PRECAUTIONS

5.1 Foundation Drainage and Backfill . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5.2 Protection of Footings Against Frost Action . . . . . . . . . . . . . . . . . . . . 9

5.3 Excavation Side Slopes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5.4 Pipe Bedding and Backfill . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

5.5 Groundwater Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

5.6 Winter Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

5.7 Corrosion Potential and Sulphate . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

7.0 RECOMMENDATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

8.0 STATEMENT OF LIMITATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

APPENDICES

Appendix 1 Soil Profile and Test Data Sheets

Symbols and Terms

Analytical Testing Results

Appendix 2 Figure 1 - Key Plan

Figures 2 and 3 - Shear Wave Velocity Profiles

Drawing PG1909-1 - Test Hole Location Plan



Report: PG1909-1July 31, 2009 Page 1

1.0 INTRODUCTION

Paterson Group (Paterson) was commissioned by Ottawa Humane Society c/o MHPM

to update our original geotechnical investigation to current Ontario Building

Code (OBC) requirements for the proposed building to be located at 271 West Hunt

Club Road, in the City of Ottawa, Ontario (refer to Figure 1 - Key Plan in Appendix 2

of this report).

The objectives of the current investigation were to:

‘ Review existing borehole information completed on the subject and adjacent

sites to determine the subsoil and groundwater conditions.

‘ Complete a seismic shear wave velocity test to confirm seismic site class

according to OBC standards.

‘ to provide geotechnical recommendations for the design of the proposed

development including construction considerations which may affect the design.

The following report has been prepared specifically and solely for the aforementioned

project which is described herein. It contains our findings and includes geotechnical

recommendations pertaining to the design and construction of the proposed

development as they are understood at the time of writing this report.

Investigating the presence or potential presence of contamination on the subject

property was not part of the scope of work of this present investigation.

2.0 PROPOSED DEVELOPMENT

It is understood that the proposed development will consist of a single storey, steel

frame construction, slab on grade structure with associated access lanes, parking and

landscaped areas.




3.0 REVIEW OF AVAILABLE INFORMATION

Based on a review of existing borehole information, the subsurface profile consists of

topsoil overlying a thin layer of silty sand/sandy silt, which in turn is overlying a deep

silty clay deposit. Glacial till was inferred to be encountered below the silty clay

deposit. Practical refusal to dynamic cone penetration testing was encountered at

18.2, 16.2 and 16.3 m depth at BHs 2, 4 and 5. Reference should be made to the Soil

Profile and Test Data sheets in Appendix 1 for specific details of the soil profile

encountered at the test hole locations.

Based on available geological mapping, the bedrock in the area of the subject site

consists of dolomite of the Oxford Formation, interbedded sandstone and dolomite of

the March Formation, or shale of the Rockliffe Formation. The overburden thickness

ranges between 15 and 50 m depth in the area of the subject site.

Groundwater levels were measured in the standpipes on April 15, 2004. The

measured groundwater levels ranged from at ground surface to 0.6 m below existing

ground surface. It should be noted that groundwater level readings could be influenced

by surface water infiltrating the backfilled borehole. Groundwater conditions can also

be estimated based on the observed colour and consistency of the recovered soil

samples. Based on these observations, it is estimated that the long term groundwater

table can be expected between a 2.5 and 4 m depth.




4.0 DISCUSSION

4.1 Geotechnical Assessment

From a geotechnical perspective, the subject site is suitable for the proposed building.

It is expected that footings will be placed on undisturbed, stiff to very stiff silty clay.

The above and other considerations are discussed in the following paragraphs.

4.2 Site Grading and Preparation

Stripping Depth

Topsoil and deleterious fill, such as those containing organic materials, should be

stripped from under the building and other settlement sensitive structures.

Fill Placement

Fill used for grading beneath the proposed building, unless otherwise specified, should

consist of clean imported granular fill, such as Ontario Provincial Standard

Specifications (OPSS) Granular A or Granular B Type II. The fill should be tested and

approved prior to delivery to the site. It should be placed in lifts no greater than

300 mm thick and compacted using suitable compaction equipment for the lift

thickness. Fill placed beneath the building areas should be compacted to at least 98%

of its standard Proctor maximum dry density (SPMDD).

Non-specified existing fill along with site-excavated soil can be used as general

landscaping fill where settlement of the ground surface is of minor concern. These

materials should be spread in thin lifts and at least compacted by the tracks of the

spreading equipment to minimize voids. If these materials are to be used to build up

the subgrade level for areas to be paved, they should be compacted in thin lifts to a

minimum density of 95% of their respective SPMDD. Non-specified existing fill and

site-excavated soils are not suitable for use as backfill against foundation walls, unless

used in conjunction with a geocomposite drainage membrane, such as Miradrain

G100N or Delta Drain 6000.




4.3 Foundation Design

Shallow Foundation

Footings can be designed using a bearing resistance value at serviceability limit states

(SLS) of 150 kPa and a factored bearing resistance value at ultimate limit states (ULS)

of 300 kPa placed on an undisturbed, stiff to very stiff silty clay crust. A geotechnical

resistance factor of 0.5 was applied to the above noted bearing resistance value at

ULS. The bearing resistance value at SLS will be subjected to potential post-

construction total and differential settlements of 25 and 20 mm, respectively.

An undisturbed soil bearing surface consists of a surface from which all topsoil and

deleterious materials, such as loose, frozen or disturbed soil, whether in situ or not,

have been removed, in the dry, prior to the placement of concrete for footings.

The bearing medium under footing-supported structures is required to be provided with

adequate lateral support with respect to excavations and different foundation levels.

Adequate lateral support is provided to a glacial till bearing medium when a plane

extending down and out from the bottom edge of the footing at a minimum of 1.5H:1V,

passes only through in situ soil or engineered fill of the same or higher capacity as the

soil.

Due to the presence of a deep deposit of silty clay, a permissible grade raise of 1.5 m

is applicable to the subject site.

4.4 Design for Earthquakes

Paterson field personnel placed 24 horizontal geophones in a straight line in roughly

an east-west orientation. The 4.5 Hz. horizontal geophones were mounted to the

surface by means of a 75 mm ground spike attached to the geophone land case. The

geophones were spaced at 3 m intervals and were connected by a geophone spread

cable to a Geode 24 Channel seismograph.

The seismograph was also connected to a computer laptop and a hammer trigger

switch attached to a 12 pound dead blow hammer. The hammer trigger switch sends

a start signal to the seismograph. The hammer is used to strike an I-Beam seated into

the ground surface, which creates a polarized shear wave. The hammer shots are

repeated between four (4) to eight (8) times at each shot location to improve signal to

noise ratio. The shot locations are also completed in forward and reverse directions

(ie.- striking both sides of the I-Beam seated parallel to the geophone array). The shot

locations are located at the centre of the geophone array and 3, 4.5 and 30 m away

from the first and last geophone.




The methods of testing and analysis completed by Paterson are guided by the

standard testing procedures used by the expert seismologists at Carleton University

and Geological Survey of Canada (GSC). It should also be noted that this testing and

analysis method was further utilized by Carleton University and GSC to complete the

Seismic Hazard Microzonation in the Ottawa Region project.

Data Processing and Interpretation

Interpretation for the shear wave velocity results were completed by Paterson

geotechnical personnel. The shear wave velocity measurement was made using

reflection/refraction methods. The interpretation is performed by recovering arrival

times from direct and refracted waves. The interpretation is repeated at each shot

location to provide an average shear wave velocity, Vs30, of the upper 30 m profile.

The layer intercept times, velocities from different layers and critical distances are

interpreted from the shear wave records. Two (2) shear wave velocity profiles are

presented in Appendix 2.

Based on our interpretation, two (2) distinct shear wave velocities were noted from

different layers. Layer 2 was noted to extend to beyond a 30 m depth.

Table 1 - Shear Wave Velocity Results

Trigger Source

Location (m)

Overburden - Layer 1 Overburden - Layer 2

Vs (m/s) Depth (m) Vs (m/s)

-30 138 11.5 234

-4.5 119 9.9 249

-3 122 8.9 223

72 121 11.0 264

73.5 129 11.0 236

99 129 8.9 213

Layer 1 Avg. Vs

126 m/s

Layer 1 -

Avg. Depth 10.2 m

Layer 2 Avg. Vs

237 m/s

Note: ‘ The trigger source locations are representative of the recorded distance with respect to the

first geophone location of the geophone array.

‘ Interpretation of results from shot location 34.5 was not possible, so the data was ignored

in our analysis.




The Vs30 was calculated using the standard equation for average shear wave velocity

calculation from the Ontario Building Code (OBC) 2006.

VDepth m

Depth m

Vs m s

Depth m

Vs m s

Vm

m

m s

m

m s

V m s

s

OfInterest

Layer

Layer

Layer

Layer

s

s

30

1

1

2

2

30

30

30

10 2

126

19 8

237

182

=

+

=

+

=

∑

∑

( )

( ( )

( / )

( )

( / )

.

/

.

/

/

Based on the results of the seismic testing, the average shear wave velocity of the

upper 30 m profile, Vs30, was calculated to be 182 m/s. Therefore, a seismic Site

Class D is applicable for the subject site as per Table 4.1.8.4.A of the OBC 2006.

4.5 Slab on Grade Construction

With the removal of all topsoil and fill, containing organic materials, within the footprint

of the proposed building, the native soil surface will be considered to be an acceptable

subgrade surface on which to commence backfilling for slab on grade construction.

Any soft areas should be removed and backfilled with appropriate backfill material.

OPSS Granular A or Granular B Type II, with a maximum particle size of 50 mm, are

recommended for backfilling below the floor slab. It is recommended that the upper

200 mm of sub-floor fill consists of OPSS Granular A crushed stone. All backfill

materials within the footprint of the proposed buildings should be placed in maximum

300 mm thick loose layers and compacted to at least 98% of its SPMDD.




4.6 Pavement Structure

For design purposes, the pavement structure presented in the following tables could

be used for the design of car only parking areas and access lanes.

Table 2 - Recommended Pavement Structure - Car Only Parking Areas

Thickness

(mm)

Material Description

50 Wear Course - Superpave 12.5 Asphaltic Concrete

150 BASE - OPSS Granular A Crushed Stone

300 SUBBASE - OPSS Granular B Type II

SUBGRADE - Either in situ silty clay or OPSS Granular B Type I or II material placed over in situ soil

Table 3 - Recommended Pavement Structure - Access Lanes

Thickness

(mm)Material Description

40 Wear Course - Superpave 12.5 Asphaltic Concrete

50 Binder Course - Superpave 19.0 Asphaltic Concrete

150 BASE - OPSS Granular A Crushed Stone

400 SUBBASE - OPSS Granular B Type II

SUBGRADE - Either in situ silty clay or OPSS Granular B Type I or II material placed over in situ soil

Minimum Performance Graded (PG) 58-34 asphalt cement should be used for this

project.

If soft spots develop in the subgrade during compaction or due to construction traffic,

the affected areas should be excavated and replaced with OPSS Granular B Type I or

II material.

The pavement granular base and subbase should be placed in maximum 300 mm thick

lifts and compacted to a minimum of 100% of the material’s SPMDD using suitable

vibratory equipment.




Pavement Structure Drainage

Satisfactory performance of the pavement structure is largely dependent on keeping

the contact zone between the subgrade material and the base stone in a dry condition.

Due to the impervious nature of the subgrade materials, consideration should be given

to installing subdrains during the pavement construction. These drains should be

installed at each catch basin as per City of Ottawa standards and specifications. The

subdrain inverts should be approximately 300 mm below subgrade level. The

subgrade surface should be crowned to promote water flow to the drainage lines.




5.0 DESIGN AND CONSTRUCTION PRECAUTIONS

5.1 Foundation Drainage and Backfill

It is recommended that a perimeter foundation drainage system be provided for the

proposed structure. The system should consist of a 100 to 150 mm diameter

perforated corrugated plastic pipe, surrounded on all sides by 150 mm of 10 mm clear

crushed stone, placed at the footing level around the exterior perimeter of the structure.

The pipe should have a positive outlet, such as a gravity connection to the storm

sewer.

Backfill against the exterior sides of the foundation walls should consist of free-draining

non frost susceptible granular materials. The greater part of the site excavated

materials will be frost susceptible and, as such, are not recommended for re-use as

backfill against the foundation walls, unless used in conjunction with a drainage

geocomposite, such as Miradrain G100N or Delta Drain 6000, connected to the

perimeter foundation drainage system. Imported granular materials, such as clean

sand or OPSS Granular B Type I granular material, should otherwise be used for this

purpose.

5.2 Protection of Footings Against Frost Action

Perimeter footings of heated structures are required to be insulated against the

deleterious effect of frost action. A minimum of 1.5 m thick soil cover (or equivalent)

should be provided in this regard.

A minimum of 2.1 m thick soil cover (or equivalent) should be provided for exterior

unheated footings, not thermally connected to a heated space, such as exterior

columns and/or wing walls.

5.3 Excavation Side Slopes

The side slopes of excavations in the soil and fill overburden materials should either

be cut back at acceptable slopes or should be retained by shoring systems from the

start of the excavation until the structure is backfilled. It is assumed that sufficient room

will be available for the greater part of the excavation to be undertaken by open-cut

methods (i.e. unsupported excavations).




The excavation side slopes above the groundwater level extending to a maximum

depth of 3 m should be cut back at 1H:1V or flatter. The flatter slope is required for

excavation below groundwater level. The subsoil at this site is considered to be mainly

a Type 2 and 3 soil according to the Occupational Health and Safety Act and

Regulations for Construction Projects.

Excavated soil should not be stockpiled directly at the top of excavations and heavy

equipment should be kept away from the excavation sides.

Slopes in excess of 3 m in height should be periodically inspected by the geotechnical

consultant in order to detect if the slopes are exhibiting signs of distress.

It is recommended that a trench box be used at all times to protect personnel working

in trenches with steep or vertical sides. It is expected that services will be installed by

“cut and cover” methods and excavations will not be left open for extended periods of

time.

5.4 Pipe Bedding and Backfill

At least 150 mm of OPSS Granular A should be used for pipe bedding for sewer and

water pipes. The bedding should extend to the spring line of the pipe. Cover material,

from the spring line to at least 300 mm above the obvert of the pipe should consist of

OPSS Granular A. The bedding and cover materials should be placed in maximum

225 mm thick lifts compacted to a minimum of 95% of the material’s SPMDD.

Generally, it should be possible to re-use the silty clay crust above the cover material

if the excavation and filling operations are carried out in dry weather conditions.

Where hard surface areas are considered above the trench backfill, the trench backfill

material within the frost zone (about 1.8 m below finished grade) should match the soils

exposed at the trench walls to minimize differential frost heaving. The trench backfill

should be placed in maximum 300 mm thick loose lifts and compacted to a minimum

of 95% of the material’s SPMDD.

To reduce long-term lowering of the groundwater level at this site, clay seals should be

provided in the service trenches. The clay seals should be as per Standard Drawing

No. S8 of the Department of Public Works and Services, Infrastructure Services Branch

of the City of Ottawa. The seals should be at least 1.5 m long (in the trench direction),

as compared to the 1 m minimum in the detail, and should extend from trench wall to

trench wall. Generally, the seals should extend from the frost line and fully penetrate

the bedding, subbedding and cover material.




The barriers should consist of relatively dry and compactable brown silty clay placed

in maximum 225 mm thick loose layers and compacted to a minimum of 95% of the

material’s SPMDD. The clay seals should be placed at the site boundaries and at

strategic locations at no more than 60 m intervals in the service trenches.

5.5 Groundwater Control

The contractor should be prepared to direct water away from all bearing surfaces and

subgrades, regardless of the source, to prevent disturbance to the founding medium.

It is anticipated that pumping from open sumps will be sufficient to control the

groundwater influx through the sides of the excavations.

A temporary MOE permit to take water (PTTW) will be required for this project if more

than 50,000 L/day are to be pumped during the construction phase. At least 5 to

6 months should be allowed for completion of the application and issuance of the

permit by the MOE.

5.6 Winter Construction

Precautions must be taken if winter construction is considered for this project. The

subsoil conditions at this site consist of frost susceptible materials. In the presence of

water and freezing conditions, ice could form within the soil mass. Heaving and

settlement upon thawing could occur.

In the event of construction during below zero temperatures, the founding stratum

should be protected from freezing temperatures by the use of straw, propane heaters

and tarpaulins or other suitable means. In this regard, the base of the excavations

should be insulated from sub-zero temperatures immediately upon exposure and until

such time as heat is adequately supplied to the building and the footings are protected

with sufficient soil cover to prevent freezing at founding level.

Trench excavations and pavement construction are also difficult activities to complete

during freezing conditions without introducing frost in the subgrade or in the excavation

walls and bottoms. Precautions should be taken if such activities are to be carried out

during freezing conditions.




5.7 Corrosion Potential and Sulphate

The results of analytical testing show that the sulphate content is less than 0.1%. This

result is indicative that Type 10 Portland cement (normal cement) would be appropriate

for this site. The chloride content and the pH of the sample indicate that they are not

significant factors in creating a corrosive environment for exposed ferrous metals at this

site, whereas the resistivity is indicative of a low to moderately aggressive corrosive

environment.




6.0 RECOMMENDATIONS

It is a requirement for the foundation design data provided herein to be applicable that

a materials testing and observation services program including the following aspects

be performed by the geotechnical consultant.

‘ Observation of all bearing surfaces prior to the placement of concrete.

‘ Sampling and testing of the concrete and fill materials used.

‘ Periodic observation of the condition of unsupported excavation side slopes in

excess of 3 m in height, if applicable.

‘ Observation of all subgrades prior to backfilling and follow-up field density tests

to determine the level of compaction achieved.

‘ Sampling and testing of the bituminous concrete including mix design reviews.

A report confirming that these works have been conducted in general accordance with

our recommendations could be issued, upon request, following the completion of a

satisfactory materials testing and observation program by the geotechnical consultant.




7.0 STATEMENT OF LIMITATIONS

The recommendations made in this report are in accordance with our present

understanding of the project. The client should be aware that any information

pertaining to soils and all test hole logs are furnished as a matter of general information

only and test hole descriptions or logs are not to be interpreted as descriptive of

conditions at locations other than those of the test holes.

The recommendations provided herein should only be used by the design

professionals associated with this project. They are not intended for contractors

bidding on or undertaking the work.

The present report applies only to the project described in this document. Use of this

report for purposes other than those described herein or by person(s) other than

Ottawa Humane Society, MHPM or their agent(s) is not authorized without review by

this firm for the applicability of our recommendations to the altered use of the report.

Paterson Group Inc.

David J. Gilbert, P.Eng.

Carlos P. Da Silva, P.Eng.

Report Distribution:

‘ Ottawa Humane Society c/o MHPM (3 copies)

‘ Paterson Group (1 copy)

APPENDIX 1

SOIL PROFILE AND TEST DATA SHEETS

SYMBOLS AND TERMS

ANALYTICAL TESTING RESULTS

APPENDIX 2

FIGURE 1 - KEY PLAN

FIGURES 2 AND 3 - SHEAR WAVE VELOCITY PROFILES

DRAWING PG1909-1 - TEST HOLE LOCATION PLAN

FIGURE 1

KEY PLAN

SITE

Figure 2 – Shear Wave Velocity Profile at -30 m Shot Location

Figure 3 – Shear Wave Velocity Profile at 73.5 m Shot Location

Documents

PG1909-REP.01.CDS-DG-SM.July 31 09