|Potential impacts||What to expect||Mitigation|
|Noise||Noise at the property lines from the controlled blasting will be momentary and insignificant.
Sirens will briefly sound before and after each blast.
|Working within The City of Calgary noise bylaw.
Monitoring sound at the property lines.
|Vibrations||Most of the explosive energy during a controlled blast is expended in fragmenting and heaving the heavy rock, but a small portion of this energy passes beyond the immediate blasting area in the form of elastic ground vibrations and air|
|Proper design and controlled blasting.
Seismographs at several locations along the property lines to monitor vibrations.
Optional pre- and post-blasting home inspections.
|Dust and air quality||Some dust can be expected but there are multiple mitigation strategies in place to minimize impacts.||The blasted rock will be used to construct embankments for the project. Any usable gravel deposits will be removed and hauled|
off-site for processing (crushing).
Air quality will be continuously monitored and if conditions exceed established limits, appropriate action will be taken.
Where practical, an earth berm will be constructed between the gravel extraction area and adjacent residences to minimize dust and noise impacts.
Where practical, the existing vegetation will be retained as a buffer between the berm and the community. Additional trees may be planted.
The berm and stockpile areas will be seeded, watered or have dust suppressant products applied to minimize erosion and dust.