Summit Earthworks Inc. was selected by the British Columbia Hydro and Power Authority (“BC Hydro”) to complete Boulder Creek Dam’s Toe Repair.
Boulder Creek is a steep mountain creek located West of Hope, BC and a tributary feeding the Wahleach Reservoir (a.k.a. Jones Lake). The diversion berm also protects an intake structure that diverts flows through the berm into Jones Creek for ecological purposes.
Responsibilities included:
- Propose, design and construction access into the Boulder Creek stream
- Propose, design and construct and deactivate water management systems to isolate and temporarily divert Boulder Creek flows around the work area (to be proposed by the contractor)
- Excavation of riprap toe under 73 metres of Boulder Creek “diversion dam”, temporary spoiling of excavated material
- Transition repairs into existing works while maintaining “smooth” hydraulic transition. Removal of material below existing grouted riprap
- Supply and install 500 kg class riprap below the creek bed to create a riprap toe to repair erosion on damaged sections of grouted riprap as per the design and specifications
General scope, outline and project activities include:
- Placing grouted riprap underneath a 73 m section of grouted Rip Rap at the toe of Boulder Creek Diversion Berm The new riprap toe will be approximately 1.5 m vertical below the existing creek bed for scour protection. Riprap as placed at a 1.0 – 1.5H:1V (steeper than the existing bank) to minimize encroachment into the channel
- Placed grout in areas of riprap utilizing specialized pumping equipment to obtain grout penetration. Typical riprap layer thickness is approximately 1200 mm
- Placed a non-grouted riprap toe. This non-grouted riprap (voids filled with naturally occurring sand and gravels) will act as self-launching toe protection and provide additional toe scour protection
- Backfilling over the new grouted toe to re-establish the channel bed
Location
Jones Lake