18103892-TM-Rev 2-Impact Study 10May2019

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Golder Associates Ltd. 1931 Robertson Road Ottawa, Ontario, K2H 5B7 Canada T: +1 613 592 9600 +1 613 592 9601 Golder and the G logo are trademarks of Golder Associates Corporation golder.com TECHNICAL MEMORANDUM DATE May 10, 2019 Project No. 18103892 TO ARK Construction c/o Peter Hume FROM Cameron Toy, MSc, PGeo EMAIL [email protected] GROUNDWATER IMPACT STUDY PROPOSED RESIDENTIAL DEVELOPMENT 807 825 MONTREAL ROAD, OTTAWA, ONTARIO Golder Associates Ltd. (“Golder”) has prepared this report to present the results of a groundwater impact study carried out for the proposed residential development to be located at 807 – 825 Montreal Road in Ottawa, Ontario (referred to herein as the “site”). The groundwater impact study is required by the City of Ottawa (“City”) as part of the Site Plan Control application. The purpose of this groundwater impact study was to determine the general hydrogeological conditions across the site by means of existing on-site borehole information, and to address possible construction-related impacts to private water supply wells. The on-site information was enhanced with published mapping and publicly available information. The water well records in the Ministry of the Environment, Conservation and Parks (“MECP”) Water Well Information System (“WWIS”) for nearby water wells were used to provide further information regarding hydrogeological conditions in the area and identify where nearby residents rely on water wells for their water supply. Golder prepared an earlier version of this report (dated June 29, 2018) that was submitted to the City as part of the Site Plan Control application for the proposed development. The City provided comments on the Site Plan Control application, including specific comments on the groundwater impact study, in a letter dated April 24, 2019. Section 4 of this report has been revised from the earlier version based on the comments provided by the City. 1.0 DESCRIPTION OF PROJECT AND SITE It is understood that a mixed use (commercial/residential) building is planned to be developed at 807 – 825 Montreal Road in Ottawa, Ontario. The approximate location of the site is shown on the Key Map insert provided on the Site Plan, Figure 1. The following is known about the site and project: The site is approximately 4,645 square metres in area and is currently undeveloped. The site is bounded to the south by Montreal Road and bounded to the north, west and east by existing residential land use. The residential properties to the north of the site along Fairhaven Way and Blackthorne Avenue are not serviced with municipal water. The planned development will consist of one twelve-story building with surface parking. Development of the property will not require extensive below grade excavation. The development will have municipal sewer and water services.

Transcript of 18103892-TM-Rev 2-Impact Study 10May2019

Page 1: 18103892-TM-Rev 2-Impact Study 10May2019

Golder Associates Ltd.

1931 Robertson Road Ottawa, Ontario, K2H 5B7 Canada

T: +1 613 592 9600 +1 613 592 9601

Golder and the G logo are trademarks of Golder Associates Corporation golder.com

TECHNICAL MEMORANDUMDATE May 10, 2019 Project No. 18103892

TO ARK Construction c/o Peter Hume

FROM Cameron Toy, MSc, PGeo EMAIL [email protected]

GROUNDWATER IMPACT STUDY PROPOSED RESIDENTIAL DEVELOPMENT 807 – 825 MONTREAL ROAD, OTTAWA, ONTARIO

Golder Associates Ltd. (“Golder”) has prepared this report to present the results of a groundwater impact study

carried out for the proposed residential development to be located at 807 – 825 Montreal Road in Ottawa, Ontario

(referred to herein as the “site”). The groundwater impact study is required by the City of Ottawa (“City”) as part of

the Site Plan Control application.

The purpose of this groundwater impact study was to determine the general hydrogeological conditions across the

site by means of existing on-site borehole information, and to address possible construction-related impacts to

private water supply wells. The on-site information was enhanced with published mapping and publicly available

information. The water well records in the Ministry of the Environment, Conservation and Parks (“MECP”)

Water Well Information System (“WWIS”) for nearby water wells were used to provide further information

regarding hydrogeological conditions in the area and identify where nearby residents rely on water wells for their

water supply.

Golder prepared an earlier version of this report (dated June 29, 2018) that was submitted to the City as part of

the Site Plan Control application for the proposed development. The City provided comments on the Site Plan

Control application, including specific comments on the groundwater impact study, in a letter dated April 24, 2019.

Section 4 of this report has been revised from the earlier version based on the comments provided by the City.

1.0 DESCRIPTION OF PROJECT AND SITE

It is understood that a mixed use (commercial/residential) building is planned to be developed at 807 – 825

Montreal Road in Ottawa, Ontario. The approximate location of the site is shown on the Key Map insert provided

on the Site Plan, Figure 1. The following is known about the site and project:

The site is approximately 4,645 square metres in area and is currently undeveloped.

The site is bounded to the south by Montreal Road and bounded to the north, west and east by existing

residential land use. The residential properties to the north of the site along Fairhaven Way and

Blackthorne Avenue are not serviced with municipal water.

The planned development will consist of one twelve-story building with surface parking. Development of the

property will not require extensive below grade excavation.

The development will have municipal sewer and water services.

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1.1 Previous Studies Completed by Others

Paterson Group Inc. (“Paterson”) completed geotechnical investigations at the site in August 2010 and June 2015.

The results of these investigations are detailed in a report (Paterson, 2015) that ARK Construction has provided to

Golder Associates Ltd. (“Golder”) for use in conducting this study.

2.0 GEOLOGY

The following section describes the geology in the vicinity of the site based on published information and

site-specific investigations.

2.1 Surficial Geology

Published surficial geology and drift thickness mapping for the vicinity of the site are presented on Figures 2

and 3, respectively. The maps indicate that no overburden material would be expected within the site limits

(i.e., the bedrock is present at the ground surface); however, glacial till (Unit 1a) with a thickness of up to

10 metres is mapped approximately 15 metres southwest of the site. The ground surface in the vicinity of the site

slopes from the north to the south.

The geotechnical investigation completed by Paterson for the site indicates the following regarding the surficial

geology:

The subsurface conditions on the site consist of topsoil over silty sand with gravel and some organics over

bedrock.

Bedrock was encountered at the site between 0.5 and 1.2 metres below ground surface.

The on-site borehole data generally agrees with the published surficial geology mapping.

2.2 Bedrock Geology

Published bedrock geology mapping for the vicinity of the site is presented on Figure 5. The published data

indicates that the bedrock at the site belongs to the Bobcaygeon Formation, which consists of interbedded

dolomite, limestone, shale and calcareous sandstone.

The geotechnical investigation completed by Paterson describes the bedrock encountered at the site as grey

limestone interbedded with shale. The bedrock quality within the investigation depth (approximately 5 metres

below ground surface) is described as ranging from very poor to good.

3.0 HYDROGEOLOGY

3.1 Regional Hydrogeology

The glacial till deposit in the area of the development is not likely capable of supplying sufficient quantities of

groundwater to be considered an aquifer. Therefore, it is likely that any groundwater users in the vicinity of the site

would obtain water from the underlying sedimentary bedrock formations.

3.2 Site Specific Hydrogeology

During the Paterson investigations, standpipe piezometers were installed within five boreholes to allow for the

measurement of groundwater elevations at the site. Groundwater elevation data presented in the Paterson report

has been reproduced in the table below.

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Piezometer ID Screened Geologic Unit Groundwater Elevation

(m ASL) Measurement Date

BH 1 Overburden (silty sand) Dry to 97.29 August 25, 2010

BH 4 Overburden (silty sand) Dry to 93.67 August 25, 2010

BH1-15 Bedrock 93.14 June 23, 2015

BH2-15 Bedrock 93.10 June 23, 2015

The groundwater elevation measurements during the Paterson investigations indicate that the water table

elevation at the site was approximately 93.1 metres above sea level (m ASL). It should be noted that groundwater

levels are expected to fluctuate seasonally. Higher groundwater levels are expected during wet periods of the

year, such as spring.

4.0 POTENTIAL IMPACTS TO EXISTING GROUNDWATER USERS

Based on our understanding of the proposed development, the greatest potential for impacts to existing

groundwater users would occur when groundwater control (i.e., dewatering) occurs during construction of the

excavation for the building foundation. It is expected that excavation during construction will extend into the

limestone bedrock, below the water table, and that groundwater will inflow into excavations from the bedrock.

The radius of influence of groundwater level drawdown during construction dewatering can be estimated using the

Sichart and Kryieleis equation (Powers et al, 2007):

𝑅 3000 𝐻 ℎ √𝐾

where Ro represents the radius of influence in metres, H-h represents the amount of groundwater level drawdown

in metres and K represents the hydraulic conductivity of the aquifer in metres per second (m/s).

It is conservatively assumed that up to 3.1 metres of groundwater drawdown may be necessary at the site, based

on the following assumptions:

Initial groundwater elevation at the site prior to dewatering is 94.1 m ASL, which is 1.0 metres higher than

the highest groundwater elevation observed at the site during the Paterson investigations.

It may be necessary to dewater excavations during construction to an elevation of 91.0 m ASL. This

elevation assumes that up to 3.0 metres of bedrock may need to be removed beyond the lowest overburden-

bedrock contact observed during the Paterson investigations (approximately 94.0 m ASL) to construct a

suitable foundation. This value has been selected as a conservative assumption. It is not expected that more

than 1.5 metres of bedrock will need to be removed.

The limestone at the site was assumed to have a hydraulic conductivity of 1.0 x 10-5 m/s, which in Golder’s

opinion is a conservative estimate for this formation.

Using the assumed values provided, the worst-case estimate for the radius of influence of groundwater level

drawdown during construction dewatering is 29 metres from the edge of a dewatered excavation.

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4.1 Groundwater Quantity

The maximum radius of influence associated with dewatering excavations was estimated to be 29 metres;

however, to provide a conservative assessment of potential impacts to groundwater users, groundwater use

within 100 metres of the site has been reviewed.

The MECP WWIS database was reviewed to determine the number and location of existing groundwater users

within the vicinity of the site. Based on the geographic coordinates provided in the well records, twelve water

supply wells were identified within 100 metres of the site. Details obtained from the WWIS records for these water

supply wells are presented in the following table. Available drawdown has been calculated for each well by

subtracting the reported static water level from the reported depth of well. Refer to Figure 1 for the reported

location of the wells.

Well ID Year Installed Depth of Well (m)

Depth to Static Water Level (m)

Available Drawdown (m)

Type of Well

1508042 1951 24.7 10.7 14.0 Bedrock

1508171 1951 27.4 10.7 16.8 Bedrock

1508173 1951 42.1 8.8 33.2 Bedrock

1508174 1951 39.6 8.5 31.1 Bedrock

1508176 1952 43.6 6.1 37.5 Bedrock

1508528 1950 25.9 4.6 21.3 Bedrock

1508530 1950 27.4 4.0 23.5 Bedrock

1508531 1950 22.9 2.1 20.7 Bedrock

1508534 1951 22.9 10.7 12.2 Bedrock

1508821 1950 25.6 3.0 22.6 Bedrock

1509904 1968 111.3 44.2 67.1 Bedrock

7213938 2013 54.9 9.4 45.4 Bedrock

Further inspection of the well records associated with Well ID numbers 1508042, 1508528, 1508530, 1508531,

1508534 and 1508821 indicates that these six wells were installed in 1951 or earlier at properties with addresses

along Montreal Road. Based on water service connection information from the City, it is understood that all

properties along Montreal Road within 100 metres of the site are connected to the municipal water supply, with

the exception of 789 Montreal Road; therefore, it is expected that at least five of these wells are no longer in use.

The six well records not associated with addresses along Montreal Road may be associated with current

groundwater users along Fairhaven Way. It is possible that temporary construction dewatering from excavations

could impact the amount of available drawdown within these wells. The available drawdown for these six wells

ranges from 16.8 to 67.1 metres. Given that the groundwater drawdown on site is not expected to exceed

3.1 metres and that the amount of groundwater drawdown will decrease with increased distance from the site, it is

not expected that impacts to groundwater quantity would be noticed by groundwater users adjacent to the site.

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It is noted that ten residences exist along Fairhaven Way within 100 metres of the site boundary. Since only six

well records were identified for these properties during the review of the WWIS, it is apparent that additional water

supply wells exist but are not listed in the WWIS. It is possible that the water supply wells for these residences are

in the WWIS but are not listed with correct geographic coordinates. Due to uncertainty in the data available in the

WWIS database, a door-to-door pre-construction survey is recommended (Section 4.3) in order to determine the

location and construction details of water wells within the vicinity of the site prior to development of the site.

4.2 Groundwater Quality

It is expected that excavation into the bedrock to construct the foundation may require blasting. It is possible that

vibration from blasting could cause well water in nearby wells to become temporarily turbid (cloudy) as vibrations

re-suspend rock flour or other loose material from the base or sides of the well bore into the water column.

This type of impact would not be expected to persist after foundation excavation. A pre-construction survey is

recommended (Section 4.3) in order to document pre-construction water quality and to allow the developer to

address any water quality concerns during construction.

4.3 Recommended Pre-Construction Survey

It is recommended that a survey is conducted prior to development to determine the location of water wells,

document well construction details and establish baseline water quality for water wells within the vicinity of the

site. As detailed in Section 4.0, impacts to groundwater quantity are not expected beyond 29 metres from the

edge of dewatered excavations on the site. It is possible that temporary impacts to groundwater quality due to

blasting, detailed in Section 4.2, may extend beyond this limit. It is recommended that the pre-construction well

survey be completed at all properties with water wells located within 300 metres of the site.

Based on water service connection information from the City, it is expected that the following properties located

within 300 metres of the site boundary are not connected to the municipal water supply:

1 through 20 Fairhaven Way

789 Montreal Road

515, 523, 539, 559, 569 and 591 Lang’s Road

3, 5 and 6 Greenhill Way

The location of these properties is presented on Figure 1. It is noted from a review of aerial photography that 539

and 569 Lang’s Road, 6 Greenhill Way and 8 Fairhaven Way do not appear to contain existing buildings and as a

result may not have a water well.

5.0 LIMITATIONS AND USE OF MEMORANDUM

This technical memorandum was prepared for the exclusive use of ARK Construction. The technical

memorandum, which specifically includes all tables and figures, is based on data gathered by Golder Associates

Ltd., and information provided to Golder Associates Ltd. by others. The information provided by others has not

been independently verified or otherwise examined by Golder Associates Ltd. to determine the accuracy or

completeness. Golder Associates Ltd. has relied in good faith on this information and does not accept

responsibility for any deficiency, misstatements, or inaccuracies contained in the information as a result of

omissions, misinterpretation or fraudulent acts.

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Page 10: 18103892-TM-Rev 2-Impact Study 10May2019

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1. ALL LOCATIONS ARE APPROXIMATE

1. BÉLANGER, J. R., URBAN GEOLOGY OF THE NATIONAL CAPITAL AREA, GEOLOGICAL SURVEYOF CANADA, OPEN FILE D3256, 2001.2. LAND INFORMATION ONTARIO (LIO) DATA PRODUCED BY GOLDER ASSOCIATES LTD. UNDERLICENCE FROM ONTARIO MINISTRY OF NATURAL RESOURCES, © QUEENS PRINTER 20163. SERVICE LAYER CREDITS: SOURCES: ESRI, HERE, GARMIN, USGS, INTERMAP, INCREMENT P,NRCAN, ESRI JAPAN, METI, ESRI CHINA (HONG KONG), ESRI KOREA, ESRI (THAILAND), NGCC, ©OPENSTREETMAP CONTRIBUTORS, AND THE GIS USER COMMUNITY4. PROJECTION: TRANSVERSE MERCATOR, DATUM: NAD 83,COORDINATE SYSTEM: MTM ZONE 9, VERTICAL DATUM: CGVD28

GROUNDWATER IMPACT STUDY807-825 MONTREAL ROAD, OTTAWA, ONTARIO

GSC BEDROCK GEOLOGY

18103892 0001 4

CONSULTANT

PROJECT NO. CONTROL REV. FIGURE

YYYY-MM-DD

DESIGNED

PREPARED

REVIEWED

APPROVED

SITE

0 25 5012.5

NOTE(S)

REFERENCE(S)

CLIENT

PROJECT

TITLE

LEGEND

SITE BOUNDARY

100 METRE BUFFER

< MOECC WWIS MONITORING WELL LOCATION

ROAD

TOPOGRAPHIC CONTOUR, METRES

GSC BEDROCK GEOLOGY

7. BOBCAYGEON FORMATION: INTERBEDDED SILTY DOLOMITE,LITHOGRAPHIC TO FINE CRYSTALLINE LIMESTONE, OOLITICLIMESTONE, SHALE, AND FINE-GRAINED CALCAREOUSQUARTZ SANDSTONE

KEY MAP

1:125,000SCALE

0

2018-06-29

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