Calgary sits on a mix of glacial till, alluvial sands, and gravels from the Bow and Elbow rivers, with groundwater typically found between 3 and 8 meters deep. These conditions mean that any historical spill—whether from a former gas station, dry cleaner, or industrial yard—can migrate quickly through the coarser layers. Contaminated soil remediation in Calgary requires understanding that local clay till can trap contaminants like a sponge, while gravel seams act as express lanes for plumes. Our team has worked on sites near the Bow River floodplain and along Deerfoot Trail, where we encountered everything from benzene plumes to lead from old battery recycling operations. We always start with a detailed site history and a phased investigation before designing the cleanup strategy.
In Calgary, the same clay till that slows contaminant migration also makes in-situ treatment slower—so we match the method to the soil, not the other way around.
Methodology and scope
We follow the Alberta Tier 1 and Tier 2 Soil and Groundwater Remediation Guidelines (2023), which set strict limits for 150+ substances. For a typical Calgary brownfield, we deploy a combination of excavation, soil vapor extraction, and bioremediation. Before any remediation design, we run a full geotechnical profile using calicatas exploratorias to map the lateral extent of contamination and ensayos de permeabilidad to assess how easily fluids move through the till. When the site has underground utilities or nearby foundations, georradar GPR helps us locate buried structures without digging blindly. Our lab is accredited under ISO 17025, so the analytical data—BTEX, PHCs, metals, VOCs—meets the strict chain-of-custody requirements Alberta Environment demands.
Technical reference image — Calgary
Local considerations
A developer we worked with bought a lot along Macleod Trail for a mixed-use building. The Phase I report flagged a former auto repair shop, but the Phase II showed diesel-range PHCs at 5 meters deep, right at the water table. The initial budget assumed simple excavation, but the coarse gravel layer allowed the plume to spread 30 meters down-gradient. That meant the contaminated soil remediation cost tripled because we had to install a groundwater extraction system and treat 2,500 cubic meters of soil instead of 800. The lesson: never skip a detailed hydrogeological assessment in Calgary—the river gravels can hide surprises that blow your schedule and budget.
PHC F1-F4, BTEX, VOCs, heavy metals (Pb, Cr, Cd, As)
Typical remediation depth
0.5 – 6 m (deeper with SVE or biosparging)
Soil type sensitivity
Clay till (low permeability) vs. sand/gravel (high permeability)
Guideline reference
Alberta Tier 1 & 2 (2023), CCME Soil Quality Guidelines
Lab accredited
ISO 17025 (analytical chemistry)
Associated technical services
01
Site Investigation & Risk Assessment
Phase I & II ESAs, soil and groundwater sampling, contaminant delineation, and Tier 1/Tier 2 risk assessment. We deliver a clear picture of what's in the ground and how it moves.
02
In-Situ Remediation
Soil vapor extraction (SVE), bioventing, chemical oxidation, and enhanced bioremediation. These methods avoid hauling soil off-site and work well in Calgary's permeable gravel zones.
03
Excavation & Off-Site Disposal
For hot spots or high-concentration zones, we excavate, classify, and transport soil to approved facilities. We manage all paperwork for Alberta Environment's tracking system.
Applicable standards
Alberta Tier 1 & 2 Soil and Groundwater Remediation Guidelines (2023), CCME (Canadian Council of Ministers of the Environment) Soil Quality Guidelines, ASTM E1527-21 (Phase I Environmental Site Assessment), CSA Z769-16 (Phase II Environmental Site Assessment)
Frequently asked questions
How much does contaminated soil remediation cost in Calgary?
For a typical residential or light commercial site, expect between CA$4,080 and CA$16,420, depending on volume of soil, contaminant type, and whether on-site treatment or off-site disposal is needed. Larger industrial plumes can run significantly higher.
What contaminants are most common in Calgary soil?
Petroleum hydrocarbons (PHCs) from old gas stations and auto shops, and heavy metals like lead and chromium from former industrial or rail yards. VOCs like trichloroethylene show up near dry cleaners. Calgary's glacial till can trap these for decades.
Do I need a Phase II ESA before starting remediation?
Absolutely. A Phase II with boreholes, monitoring wells, and lab analysis tells you exactly which contaminants are present, at what depth, and how far they've spread. Without it, your remediation plan is guesswork.
How long does the remediation process take from start to closure?
It depends on the method. Excavation and disposal can wrap in 2-4 weeks for small sites. In-situ methods like SVE or bioremediation often take 3 to 12 months. Regulatory closure with Alberta Environment usually adds 4-8 weeks after the final report.
