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Site Supervision & CM, QA/QC

Ottawa Light Rail Transit - Execution

Service Performed
Site supervision services, engineering support and monitoring
Commencement - Services
February 01, 2012
Completion - Services
January 01, 2019
Location
259 Albert Street
Ottwa, ON K1R 7Z0
Canada
Geology description

The geology varied between competent limestone and fractured shale. A soft ground section included highly variable glacial till deposits comprising sand, silt and clay layers and a groundwater table close to ground surface.

Geology types
Description

Ottawa's Confederation Line runs from Tunney's Pasture station in the west to Blair station in the east, is 12.5 km long and includes 15 stations. The central piece is a 2.5 km long tunnel, running under the central business district of the city and including three underground stations. The twin track running tunnel and the three underground stations were constructed using the mined construction method in order to minimise surface disruption. The underground stations are located directly adjacent to existing, sensitive and sometimes historic buildings and required detailed studies of risks and risk mitigation measures during design and construction.

Activity
Service areas
Site Supervision & CM, QA/QC
Construction methods
Tunneling under
Station cavern construction underway
Excavation of station cavern complete
Project number
123E
Project Type
Final cost
$2.1 billion CAD

Highway 401 Crossing - Design Representation on Site

Service Performed
Design Representation on Site; ensuring design compliance and documentation. Signatory on Required Excavation & Support (RES) Sheet.
Commencement - Services
September 01, 2019
Completion - Services
January 01, 2020
Location
97 Front Street West,
Toronto, ON ON MJ5
Canada
Geology description

Granular and cohesive embankment fill underlain by glacial till underlain by glacial till. Subsurface obstructions such as piles and boulders.

Geology types
Description

The TTP are delivering a new two track rail tunnel of approximately 176m length crossing the Highway 401. The purpose of the tracks is to increase capacity along the Kitchener GO commuter rail corridor as well as to accommodate the new Union-Pearson (UO) Express service. The new rail tunnels are mined under the 401/409 Highway using the Sequential Excavation Method (SEM). Our role on this assignment was to provide tunnel design services addressing the challenging conditions (e.g., very low overburden, intercepting piles and maximum settlement allowance) as well as providing on site design representation.

Activity
Service areas
Site Supervision & CM, QA/QC
Construction methods
Tunneling under
East Portal Entrance
Top Heading Excavation Face
Project number
487E
Project Type
Final cost
$117 million CAD
Completion date
Ongoing

North Yorkshire Polyhalite Project

Client
Service Performed
Dr. Sauer & Partners provided commercial support, SCL design verification and functioned as a mediator between Sirius Minerals’ mining and construction team.
Commencement - Services
April 01, 2019
Completion - Services
October 31, 2019
Location
Whitby
Yorkshire
YO11 3ZB
United Kingdom
Geology description

Most of the MTS is developed within the Redcar Mudstone Formation. It comprises alternating layers of silty mudstone and clayey siltstones with subordinated thin beds of limestone and sandstone.

Bands of ironstone nodules and fossil shells as well as pyrite are present in places. Multiple major fault systems were identified that cut the MTS alignment. 

Geology types
Description

North Yorkshire holds one of the largest, high grade polyhalite reserves worldwide. It is located within the North York Moors National Park, ca. 1800m below surface. Once processed, this mineral functions as an organic fertilizer to boost harvest. Sirius Minerals plc are currently developing the infrastructure to mine the polyhalite. This operation requires deep shafts to access the mineral body but also demands an extensive mass transport system (MTS) to keep the impact on the National Park to a minimum. Therefore, at ca. 350m below surface, a series of SCL tunnels link the deep shafts to a conveyor belt system, which again connects the mining operation via a 37km TBM tunnel to its material handling facility.

Activity
Service areas
Site Supervision & CM, QA/QC, Tunnel Design & Specialities
Construction methods
Tunnel length
37km
Project overview
Woodsmith mine site close to Whitby
Project number
515C
Final cost
£4.2 billion GBP

Leesburg Inter-Quarry Tunnel - Execution

Service Performed
Site supervision on behalf of Luck Stone Corporation including supervision of all SEM activities, quality assurance services, cost and schedule control and design coordination on site.
Commencement - Services
April 01, 2018
Completion - Services
March 01, 2019
Location
Leesburg Plant
20210 Luck Lane
Ashburn, Virginia, VA 20147
United States
Geology description

Located within the Culpeper Basin, a sedimentary rock formation characterized to be of Lower Mesozoic Age. The existing Luck Stone quarry is situated in a Diabase intrusion (dyke) of this sedimentary rock.

Geology types
Description

Luck Stone Corporation (LSC) is the nation's largest family owned and operated producer of crushed stone, sand and gravel. At their plant in Leesburg, Virginia, Luck Stone Corporation acquired a new quarry, which is located to the West of Goose Creek river. An inter-quarry tunnel was constructed to link the existing South-Eastern pit with the new West pit. The tunnel's cross section is approximately 45 feet in diameter, and the tunnel's length is approximately 1275 feet. The tunnel crosses the Goose Creek river approximately 50 feet beneath. The excavation method was drill and blast in hard rock (diabase).

Activity
Service areas
Site Supervision & CM, QA/QC
Special Construction techniques
Tunneling under
Tunnel length
1275 feet
South-East portal - final stage
South-East portal - construction stage
Project number
242E
Final cost
$13 million USD

Bank Station Capacity Upgrade - Site Supervision

Service Performed
Design of tunnels and shafts (primary lining, waterproofing and secondary lining). Design representation on site during construction
Commencement - Services
August 01, 2013
Completion - Services
May 01, 2022
Location
London
London
EC3V 3LA
United Kingdom
Geology description

The geology comprises London Clay formation overlain by Quaternary superficial deposits and made ground.

Geology types
Description

Bank Station is a London Underground station located in the City of London financial district. It is a key interchange served by five existing lines. The Bank Station Capacity Upgrade (BSCU) aims to relieve heavy passenger congestion during peak hours for boarding, alighting and interchange. The capacity upgrade comprises the construction of a new southbound platform tunnel and associated length of running tunnel for the Northern line, connecting passageways to the existing station tunnels, and the provision of step-free access from King William Street. The total length of tunnels is 1,300m with tunnel cross sections that range from 10m2 up to 90m2.

Activity
Service areas
Site Supervision & CM, QA/QC
Tunneling under
Hybrid SCL and squareworks structures
Exposure of live LU asset (existing cast iron platform tunnel shown)
Project number
451E
Final cost
£563.8 million GBP

City Trunk Line South

Client
Service Performed
Site supervision for SEM/NATM works
Commencement - Services
July 01, 2016
Completion - Services
November 01, 2016
Location
111 Hope St
Los Angeles, CA 90012
United States
Geology description

Wash deposits consisting of moderately dense sand, silty sands and sandy silts.

Description

The constructed tunnel is part of the City Trunk Line project in L.A. (replacement of an existing water trunk line). The tunnel is located at the junction of Riverside Drive and Whitsett Avenue. It is between eight and ten feet in diameter and has a total length of 252 feet. To fit between the existing structures in the ground (foundation piles of a bridge), the tunnel follows an S-shape and is divided into sections with different geometries. The tunnel was built using NATM/SEM construction methods. The primary support measures included fibre reinforced shotcrete, lattice girders and spiles (rebar spiles and grouted pipe spiles).

Activity
Categories
Service areas
Site Supervision & CM, QA/QC
Construction methods
South shaft
Completed tunnel section
Project number
420E
Final cost
$14.5 million USD

University Link - Execution

Service Performed
Site supervision services, consulting and monitoring.
Commencement - Services
December 01, 2011
Completion - Services
August 01, 2012
Location
401 S. Jackson Street
Seattle, WA 98104
United States
Geology description

The geology along the alignment consists of over-consolidated glacial clay and till with fractured zones, as well as sand and silt layers.

Geology types
Description

University Link is a 5km light rail extension that runs in twin-bored tunnels from Downtown Seattle north to the University of Washington, with stations at Capitol Hill and on the University of Washington campus. The project further includes 20 cross passages located in soft ground and a maximum design water head of 60m. To deal with the prevailing geological conditions, specific ground support categories were developed. Steel fibre reinforced initial lining, sheet membrane waterproofing and CIP final lining were utilised.

Activity
Service areas
Geological Engineering, Site Supervision & CM, QA/QC
Construction methods
Cross passage excavation
Propping of TBM tunnel at cross passage
Probe drilling at cross passage
Finished cross passage
Project number
262E
Final cost
$1.6 billion USD

Ottawa Combined Sewage Storage Tunnel (CSST)

Service Performed
TBM segmental lining design, rock mass grouting design and engineering support services during construction.
Commencement - Services
February 01, 2016
Completion - Services
February 01, 2020
Location
110 Laurier Avenue West
Ottawa, ON K1P 1J1
Canada
Geology description

The alignment of the tunnels mainly crosses limestone formations with laminated black shales of varying thickness. The rock is overlain by glacial till, glaciofluvial deposits and fill.

Geology types
Description

The CSST project is part of the Ottawa River Action Plan and will greatly reduce the frequency of sewage overflows during storms entering the Ottawa River. The tunnels will hold up to 43,000 m3 of sewage overflow during major rainfalls which will be treated and returned to the river once the rainfall has subsided. Additional benefits include reducing the risk of basement flooding and increasing operational flexibility and redundancy of the sewage system. The project comprises design and construction of two TBM tunnels running east-west and north-south along 6.2 km in total, and multiple shafts and support buildings such as odour control facilities.

Activity
Categories
Final cost
$232,000,000
Service areas
Construction methods
Special Construction techniques
Tunneling under
Overview plan of the CSST   (http://ottawa.ca)
East West Tunnel under construction (3m tunnel ID)
Excess wet weather flow is sent to the CSST (http://ottawa.ca)
Project number
481C
Final cost
$232 million CAD
Completion date
Ongoing

Edmonton Light Rail

Client
Service Performed
Dr. Sauer and Partners provided construction support services and supervision of the excavation of the Light Rail Tunnels, which were constructed using NATM.
Commencement - Services
August 01, 2011
Completion - Services
January 01, 2013
Location
1 Sir Winston Churchill Sq NW
Edmonton, AB T5J 2R7
Canada
Geology description

Glacially controlled terrain comprising clay, silt and sand deposits underlain by Mesozoic bedrock consisting of sandstone and shale.

Geology types
Description

The City of Edmonton built a 3.3km Light Rail Train extension from Churchill Station to the Northern Alberta Institute of Technology. Approximately 670m of the extension are underground consisting of ca. 430m of twin tunnels of 6m nominal diameter. NATM/SEM tunneling was applied. The software 2DOC, which was at that point used in North America for the first time, allowed real-time tracking of all geotechnical instruments on the project, as well as the recording of the actual geotechnical conditions and the grout support elements installed.

Activity
Final cost
$300,000,000
Service areas
Site Supervision & CM, QA/QC
Construction methods
Tunneling under
Excavation under way
Tunnel face
Project number
437E
Final cost
$300 million CAD

Cigar Lake Operation

Owner
Service Performed
Site supervision services, consulting, monitoring and on-site design performed by senior engineer and two tunnel inspectors.
Commencement - Services
September 01, 2012
Completion - Services
August 01, 2015
Location
2121, 11th St W
Saskatoon, SK S7M 1J3
Canada
Geology description

Highly thermo hydraulically weathered metapelites in form of weak rock and clayey-silty-sandy soils, highly anisotropic, cut with slickensided graphitic planes.

Geology types
Description

Cameco Cigar Lake is the world's highest grade uranium deposit. It is considered one of the world's most technically challenging uranium deposits to mine. The ore body and the ground around has to be bulk frozen prior to extraction of the ore using high pressure water jets. Development of the freeze/production cross-cuts take place beneath the ore body in unstable, soil-like highly weathered and anisotropic rock. A flexible shotcrete lining with longitudinal slots of special yielding elements together with systematic rock bolting were utilized to cope with squeezing ground conditions.

Categories
Final cost
$50,000,000
Service areas
Site Supervision & CM, QA/QC
Construction methods
Special Construction techniques
Pocket excavation in unstable ground conditions
Installed yielding elements prior to spraying shotcrete
Project number
455E
Project Type
Final cost
$50 million CAD
Completion date
Ongoing

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