Recoating of the interior of BR2 Penstock 1 and Unit 5 and Unit 6 scroll cases (~142,000 ft²), design/supply/install penstock modifications, and complete repairs to exterior coating (<500 ft²). Areas recoated include the penstock interior, turbine scroll cases interior and TIV interior. The work included removal of silt deposits/detrimental substances to painting, surface preparation for painting, and paint application. The work also included design, supply and installation of penstock modifications which include openings and anchor points for the work. The work also included any support activities required for this work as described in the specifications.
Supply and installation of 2 new expansion joints and supply & installation of 130 repair plates inside exiting 10ft diameter penstock.
- General Contractor for the repairs to 14 ft diameter, 1580 ft long, steel riveted penstock originally constructed in 1925.
Scope of Repair Work Completed
- Removing and replacing two 50’ segments of pipe from under existing bridge and log flume;
- Installation of approximately 350 internal repair plates;
- Chemical removal of 60 cu meters of rock adjacent to penstock and intake structure;
- Removal and replacement with site assembled expansion joints at 2 locations
- Refurbishment of existing surge tower.
- Construction of Concrete Intake and Weir Structures
- Forming, batching, and pouring of reinforced concrete – 393 m3
- Supply and installation of misc. metals: platform grating, handrails, slide gates, etc.
- Installation of Obermeyer weir
- Multiple creek diversions for staged weir construction
- Drilling and grouting of rock dowels
- Erosion and sediment control
- Supply and Installation of Penstock – 2,156 m total length
- Supply and Installation of 54” HDPE Pipe – 688 lm
- Supply and Installation of 48” HDPE Pipe – 277 lm
- Supply and Installation of 44.5” Ductile Iron Pipe – 1,191 lm
- Trench rock removal– 1,352 lm
- Supply and Installation of a 27 m span pipe bridge
- Construction of a 4.7 km Penstock road in extremely steep and rugged terrain, with limited access. penstock road construction required the clearing and grubbing of a 30 m wide right-of-way, 70,000m3 of excavation, placement of 35,000m3 of Structural Fill
- Construction of 1.5 km of secondary access roads and various staging areas
Penstock Installation:
- 2,708 m of 54” HDPE Pipe (DR41, DR26 and DR 21)
- 1,768 m of 48” D.I. Pipe (PC150, PC200 and PC250)
- 200 m of 48” O.D. x 0.375” welded steel pipe c/w miter bends
- Construction of Concrete Intake and Weir Structure Forming, batching and pouring of reinforced concrete – 350 m3
- Supply and installation of misc. metals: platform grating, handrails, slide gates, Coanda screen, gate valves, etc.
- Drilling and grouting of 120 @ 3 m deep rock anchors
- Installation of 36” Steel Penstock – 2,231 m
- 383 m of overland penstock and 1,848 m of buried penstock
- 248 m of the overland penstock was completed using a 2 Madill 090
- Towers to create a “Skyline”
- 6 anchor blocks and 22 pedestals complete with steel saddles – 450 m3 of reinforced concrete
- 2 Pipe bridges – 1 @ 44 m span and 1 @ 33m span
- Fabrication of 50 welded steel miter bends
- Installation of 90 pipe joints: 90 Victaulic AGS couplings for grooved end pipe, 40 Fluidmaster 600 couplings with weld-on rings and 50 butt welded joints.
- Pipe grooving for Victaulic AGS couplings was completed onsite by Hazelwood forces
- 12,000 m3 of trench rock removal
- Onsite manufacturing (crushing and screening) of pipe bedding and road surfacing gravel
- Clearing and grubbing overland penstock sections
- Construction of Powerhouse Foundation and Substation Concrete
- Forming and pouring of reinforced concrete – 350 m3
- Supply and installation of misc. metals and substation fencing
- Construction of tailrace channel
- Rock excavation and structural backfill
- Drilling and grouting of 80@ 3m deep rock anchors
This project diverts water flow via a diversion weir and intake structure on the Jimmie Creek, through a pressure pipeline on the banks of the creek, to a surface powerhouse near the confluence of Jimmie Creek and the Toba River. The outflow from the powerhouse returns to the creek via a tailrace leading to locations upstream of three natural fish barriers. The Jimmie Creek facility is connected to the existing 230 kV transmission line which runs from the existing East Toba Powerhouse to the BC Hydro Transmission system at Saltery Bay.
Hazelwood Construction provided installation of the bifurcation and penstock which consists of approximately 2.6km long, 2.2m to 2.4m nominal diameter, buried and exposed steel pipe, including a 40m long pipe bridge. Specifically, this included:
- Installation of the bifurcation and penstock which consists of approximately 2.7km long, 2.1m to 2.4m nominal diameter, buried and exposed steel pipe with one or more creek crossings.
- Installation of 2,600m of 2.2m to 2.4m welded steel pipe (bell-spigot and butt welded joints)
- Construction of penstock road and spur roads for access
- Felling, clearing and grubbing of penstock alignment
- Overburden and rock excavation of penstock trench and roadway
- Processing and placement of construction aggregates and production of coarse concrete aggregate for others
- 40m long x 2.2m diameter steel pipe bridge across Jimmie Creek c/w concrete anchor block, support wall, saddle and expansion joint
- Design, supply and installation of cathodic protection system
Video provided by Alterra Power Corp.
Run of River Hydroelectric Project – a 5.5 Megawatt (MW) run-of-river hydroelectric project on Sakwi Creek, near Agassiz, British Columbia. The Project is intended to meet “green power” requirements, as independently certified pursuant to Environment Canada’s Environmental Choice Program.
- A portion of the stream flow in Sakwi Creek will be diverted at the main headworks and conveyed via the penstock to the powerhouse, and then returned to Sakwi Creek immediately downstream via the tailrace. A portion of the stream flow in a significant unnamed tributary of Sakwi Creek (hereafter referred to as “Tributary A”) will also be diverted to the main headworks to contribute to power production.
To this end, HCSI scope consists of:
- Land clearing and site preparation / Access Roads constructed / Headworks – Main Intake (intake structure, weir and headpond) / Headworks – Tributary Intake (weir, debris screen and isolation gate) / Main Penstock (5.5km long combination of low pressure HDPE pipe and high pressure steel pipe / Tributary Penstock (900m long low pressure HDPE pipe) leading from the tributary intake on Keenan Creek to the main headworks on Sakwi Creek) / Powerhouse (planned to contain a Pelton turbine, generator, controls and associated equipment) and Tailrace (allowing the water to flow back into Sakwi Creek) / Clearing for a 2km long, 25Kv transmission line / Final site remediation.
General Contractor for construction of a 6 MW hydroelectric project that included the construction of:
- Concrete intake and weir structure c/w Coanda screen and gates.
- Powerhouse and switchyard concrete foundations and miscellaneous metals.
- 900 mm dia. steel penstock (3.1 km) and 1,070 mm dia. HDPE penstock (0.5 km), including three major buried creek crossings, two of them at waterfalls.
- Construction of 2 Concrete Intake Structures
- Forming, batching, and pouring of reinforced concrete –650 m3
- Supply and installation of misc. metals: platform grating, handrails, slide gates, etc.
- Installation of Obermeyer inflatable weir
- Multiple creek diversions for staged construction
- Design, supply and installation of 70ft steel portable bridge
- Drilling and grouting of rock dowels
- Erosion and sediment control
- Supply and Installation of Penstock – 2,156 m total length
- Supply and Installation of 48” HDPE Pipe – 1,161 m
- Supply and Installation of 63” HDPE Pipe – 612 lm
- Supply and Installation of 57” Ductile Pipe – 1,133 lm
- Supply and Installation of 54” Welded Steel Pipe – 750 lm
- Drilling and blasting of rock
- Supply and Installation 2 @ 60ft permanent bridges
- Construction and maintenance of haul roads
- Construction of Powerhouse Foundation and Superstructure
- Forming, batching, and pouring of reinforced concrete –700 m3
- Supply and installation of prefabricated steel building
- Supply and installation of 30T overhead crane
- Construction of concrete foundations for switchyard