18103892-TM-Rev 2-Impact Study 10May2019
Transcript of 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 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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GROUNDWATER IMPACT STUDY807-825 MONTREAL ROAD, OTTAWA, ONTARIO
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ARK CONSTRUCTION
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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