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John Hart Generating Station
Replacement Project
August 2015
Community Construction Update
Report #26
Prepared by: Stephen Watson, BC Hydro
(O) 250-755-4795 or (C) 250-616-9888
1
Project Update And Schedule Project Status:
• Adit B is complete;
• Blasting underway on Adit C (off of Adit B), with muck bay
complete and tunnel advanced 54 m, near to where the
tailrace tunnel (from the powerhouse to the river) will be
located;
• First bench of powerhouse cavern drilled, blasted and
mucked. Continued work on slashing out the bench;
• Drilling and installation of support for powerhouse ceiling
completed;
• Main access tunnel progress continues using a specialized
support system to get through the loose rock area;
• Ramp at new tailrace area (behind existing powerhouse)
constructed and prepared for tree removals at end of
August;
• All cofferdam piles installed by first week of September; and
• Dowels drilled and installed, forms built and concrete
poured for concrete infill on Block 1 of existing dam. A mass
concrete infill is required to support the dam and works in
advance of drilling the new water intake underneath it. 2 Cofferdam piles.
Project Update And Schedule
Project Schedule:
• July-September: Concrete infill at the dam to prepare
for new water intake work;
• August-December: Powerhouse vertical excavation;
• September: Tree removal and stripping for new surge
tank and tailrace locations to be completed;
• September-November: Tailrace (future water
discharge from the tunnel) excavation beside existing
generating station;
• September-December: Completion of cofferdam and
construction of retaining walls;
• Completion in 2016: Drilling and blasting now underway on power tunnel to water intake shaft (from
the powerhouse to the John Hart dam); and
• Completion in 2016: Main access tunnel to the
powerhouse.
3 Drilling within the main access tunnel.
Construction Pictures – Powerhouse Cavern
4
The picture shows the first bench preparation for the downward drilling, blasting and
excavation of the powerhouse cavern. Each bench removal (layer of rock) has a downward depth of 3.5 metres.
Construction Pictures – Adit C
5
Construction Pictures – Adits B and C
6
Construction Pictures – Main Access Tunnel
7
See the Point of Interest on the
report’s last page for information about this unique excavator.
Construction Pictures – Main Access Tunnel
8
Overview of Cofferdam and Intake Works
9
Water release
valve – flow
down Elk Falls
Canyon
Cofferdam
Water
passage to
tunnel
John Hart
dam
Time Lapse Camera – John Hart Dam
10
Aug 5 Aug 12
Aug 19 Aug 26
Construction Pictures – Downstream of John
Hart Dam
11
Construction Pictures – Downstream of John
Hart Dam
12
Construction Pictures – Downstream of John
Hart Dam
13
Work progression on the new water intake from the reservoir.
Construction Pictures – Downstream of John
Hart Dam
14
Construction Pictures – Cofferdam
15
Aug 2 Aug 9
Aug 16 Aug 23
16
(To come on Aug 30)
Aug 30
Surge Tank • Pedestrians using the BC Hydro trails to the Elk
Falls Suspension Bridge should be aware of
increased construction traffic and activity along the
roadway running parallel to the south side of the
existing penstocks. Trail users cross this road to
access the footbridge over the penstocks and then
enter the Elk Falls Provincial Park;
• Beginning around September 9, for about a week,
tree removals will take place along the access road
that parallels the woodstave penstocks and near
the trail system. People should expect sporadic
delays of about 10 minutes to safely allow the
contractor to fall the trees; and
• The road will then be widened to allow for two-way
construction traffic to the new surge tank area.
17
This picture was taken by the Brewster Lake Road Bridge
and shows a small section of the widened construction road that will extend about a kilometre down to the surge tank area. Above, an August 28 CR Mirror article about the tree
removal work.
Tailrace Work Area
• Work is beginning on the site of the new tailrace area, located on the north side of the
penstocks, between the Station View Trail pedestrian bridge and the existing powerhouse;
• A ramp was constructed to access the slope where trees are being removed (shown below);
• Trail users in the area may encounter 10-minute delays into early September during tree-falling to ensure public safety;
18
Environment Update • Recycling: To reduce waste on site, InPower BC has
implemented a drink container recycling program – which
includes education for workers on site, a collection
system and returning them to the recycling centre. Four
large bags were returned on the first trip this month, and
the funds raised by those donations were donated to the
Campbell River Food Bank.
• Rescue and prevention: Underground workers were able
to capture a bat in the mine area and release it back
above ground. However, there have been some bats
stuck in the ventilation systems and not surviving. The
contractors have been working with environmental
professionals to grate off different areas to prevent bats
from entering. These adjustments have been successful
to date.
• Leaving it better than found: After test drilling was
completed near the penstocks, equipment was removed
from the area and the site restored. Along with general
restoration, crews pulled previously established invasive
holly from the surrounding park areas and trails were
raked, doing their part to improve the popular area.
19
Recycling bottles from the site, and
below, holly removal along a trail.
John Hart Project Interpretive Centre
• The days the interpretive centre will be open will shift from five
days a week to three days a week starting September 8. The
centre will be open from 9:30 a.m. to 4:30 p.m. on Tuesday,
Thursday and Saturday. This will be in place through the fall,
winter and spring;
• The monthly visitor totals from May to August were as follows:
• May: 2,589 visitors for an average of 144 visitors per day;
• June: 2,648 visitors for an average of 139 visitors per day;
• July: 4,214 visitors for an average of 183 visitors per day;
• August: 4,037 visitors for an average of 183 visitors per
day;
• Through a partnership with BC Hydro and the Campbell River
Visitor Centre, a satellite Visitor Centre has been setup for a
few days a week in August and September beside the
interpretive centre to provide more information about regional
tourism opportunities;
• This year to date there have been 14,713 visitors through the
interpretive centre. A final tally for 2015 will be provided at the
end of the year; and
• From May 8 to July 31, BC Parks estimates about 47,000
visitors have viewed the Elk Falls suspension bridge.
20
A new cedar bench was placed
in the centre for visitors to utilize while watching videos on the touchscreen TV. Another project
construction update video is planned to be added to the TV
around early November.
Business Profile – Strategic Natural Resource
Consultants Background: Strategic Natural Resource Consultants was established in 2003 and has since become a highly regarded
natural resource consulting firm on the West Coast. With offices in Port McNeill, Campbell River, Port Alberni and Nanaimo, SNRC’s focus is in resource and land management, professional forestry,
construction support services, environmental sciences, geomatics & GIS, and remote site project development.
Some notable utility developments that they have worked on include the Toba-Montrose Hydroelectric project, Kokish River hydroelectric project, Cape Scott Wind Farm, BC Hydro’s Interior to Lower Mainland
(ILM) transmission line project, as well as numerous other BC Hydro projects. SNRC is excited to be part of the John Hart project team, right here in their backyard.
What you may not know about them:
Strategic has recently launched its own drone, the multi-sensor Sassin X1. This unmanned aerial vehicle (UAV) is capable of obtaining high-resolution digital photography, 3-dimensional surface models, thermal and near infrared imaging, orthomosaic imagery, full HD 1080p video and more.
The Sassin X1 is completely customizable and can be configured to suit a variety of applications. SNRC’s
certified pilots operate within all Transport Canada regulations to ensure that the X1’s industry leading sensor array will capture the information their clients need safely, accurately and quickly.
Project role: Clearing Plan Development: Desktop analysis, field reconnaissance and clearing plan development.
Compliance to the Construction Environmental Management Plan (CEMP), Environmental Work Plan (EWP) and specific Environmental Protection Plans (EPP).
Timber Evaluation and Cruising: Determination of species distribution, timber volume and grade.
Danger Tree Assessment and Identification: Identification and management prescriptions associated with 21
Business Profile – Strategic Natural Resource
Consultants Danger Trees immediately adjacent to clearing areas. Special management prescriptions associated with
danger trees located in the Elk Falls Provincial Park.
Vegetation Inventory and Monitoring: Through Hatfield Consulting. Transect establishment for the location
and identification of invasive species within the John Hart project construction site.
People working on the project: Eight SNRC staff have participated on the John Hart project, led by their Environmental Department.
Services include professional foresters, professional biologists, geomatics (survey and mapping), certified arborists and accredited timber evaluators.
22
Shelby Lefebvre and Dia Anderson
from SNRC at the John Hart project
site.
People Profile – Tony Dell About Tony:
Background: Born in South Africa, Tony graduated as a civil engineer from university
in Johannesburg. After spending four years in structural engineering, he
moved on to tunnel/rock engineering in 1980. Tony moved to Vancouver
in the mid-1990s and joined SNC-Lavalin in 2000.
Home: While Vancouver has been home base despite international work for over
20 years, Tony decided to move to Campbell River in October 2014 for the John Hart project given all the underground work that would require large amounts of his time and attention. Tony’s son, Brendan, based in
Nanaimo, works for BC Hydro on the transmission line side of the business.
Hobbies: In 1973, Tony spent one month’s salary on a camera, and photography (particularly landscapes) has been a
hobby ever since. He’s also taken up archery – after seeing the sign for the Campbell River Fish and Game archery range on the Hwy 28. He adds that grandchildren and Netflix also help to fill his spare time.
Project responsibility: As Lead Geotechnical Engineer, Tony is the designer responsible for the surface and underground
excavations. He’s been seconded from SNC-Lavalin to ASL-JV and works with a team of four in the Vancouver office on the design, along with four at the site who supervise and monitor the plan’s progress and
modify the designs as required. When modifications are required along the way, Tony leads that planning .
Quote: “When you’re working on a design-build project, it’s essential to be a team – we have to work together. This project is a job that combines innovation and professional interest, all within a beautiful city, and it has created a great team.” 23
Construction – Point of Interest
Each month, BC Hydro and InPower BC will
provide a construction fact, occurrence, or
situation.
• Excavator with a Popeye arm:
• The New Austrian Tunnelling Method (NATM),
which has been growing in use in Europe over
the last few years, is being implemented at the
John Hart project;
• The method is being used to work around the
area of unconsolidated ground located in the
main access tunnel, which includes installing
pipes along the roof and grouting between them
before excavating the loose rock below it;
• To take on this excavation work, Frontier-Kemper
has brought in a CAT 328 with a special arm,
nicknamed the “Popeye Arm;”
• The arm is very powerful, and can move side to
side as well as up and down, allowing for the
claw to work without the body moving. This
allows it to create the tunnel profile.
24