Excavation + Allan Block Retaining Wall

Precision Excavation and Site Preparation

The Salt Spring Island retaining wall project required exceptional accuracy from start to finish. Working beneath an existing deck added layers of complexity to the excavation process, demanding careful planning and steady machine operation. Despard Contracting’s team approached the site with precision—removing soil and rock while preserving surrounding structures and landscaping. Every step was measured to create a stable base for the new Allan Block retaining wall without disturbing the existing framework above.

Prior to excavation, the team performed a full assessment of soil conditions, slope angles, and drainage paths. This pre-planning ensured that excavation depths, wall placement, and material volumes were optimized for safety, efficiency, and longevity. Throughout the process, consistent communication between operators and supervisors allowed the project to progress smoothly within the tight working footprint.

Drainage and Geogrid Reinforcement

Proper drainage was a critical factor in ensuring the long-term stability of the retaining wall. Despard Contracting implemented a robust subsurface drainage system designed to manage water runoff and minimize hydrostatic pressure behind the wall. Drainage pipe, filter fabric, and granular backfill were installed systematically to guide water away from the structure, protecting it from the damaging effects of moisture buildup over time.

In conjunction with drainage, geogrid reinforcement was applied in strategic layers between courses of Allan Block. This structural reinforcement increases wall strength, distributes loads evenly, and prevents soil movement or separation under pressure. By combining effective drainage control with geotechnical reinforcement, the team ensured the wall would remain secure and stable for decades.

Allan Block Construction and Finishing

Once the foundation and base course were in place, Despard’s crew began constructing the Allan Block retaining wall with attention to both function and form. Each block was leveled and aligned for a seamless appearance while maintaining structural precision. The use of high-quality Allan Block components provided the ideal combination of durability, flexibility, and visual appeal.

The wall was built in progressive lifts, with compaction and geogrid reinforcement applied at each stage. Careful backfilling followed each course to maintain even pressure and structural balance. As the wall took shape, the crew ensured consistent face alignment and clean joints, creating a visually refined finish that complemented the surrounding property.

Environmental Considerations and Site Preservation

Salt Spring Island’s natural beauty and terrain required an environmentally responsible approach. Despard Contracting took deliberate steps to preserve the integrity of nearby vegetation, soil profiles, and drainage pathways. Erosion control measures were implemented during excavation to protect adjacent areas from runoff and sediment displacement. By maintaining a clean and contained work zone, the team upheld the environmental values important to the region’s homeowners and community.

Material handling was conducted with efficiency and minimal disturbance. Excavated soils were either reused appropriately on-site or removed for disposal in accordance with local environmental standards. This approach balanced operational productivity with stewardship of the surrounding landscape.

Project Outcome and Quality Assurance

The completed Allan Block retaining wall now serves as both a structural reinforcement and an aesthetic enhancement to the property. Its clean lines and integrated design complement the existing deck and natural slope, creating a visually cohesive outdoor environment. Beneath the surface, the engineered drainage and reinforcement systems ensure lasting performance through seasonal weather changes and soil movement.

Despard Contracting’s success on this project reflects their commitment to quality, communication, and precision on every job site. From excavation to final inspection, the team delivered a solution that balances technical expertise with craftsmanship—showcasing why Despard is trusted across Vancouver Island for complex excavation and retaining wall construction.