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Environmental Site Assessments in Calgary
Vista Environmental Science provides professional environmental site assessments in Calgary for multi-family, commercial, and industrial properties. We help clients identify environmental risks, meet Alberta’s due diligence requirements, and move projects forward with confidence.
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Our Phase 1 environmental work adheres to the CSA-Z768 standard and the Alberta Environmental Site Assessment Standard, ensuring full compliance for lenders, brokers, and developers. Whether you’re redeveloping land, purchasing property, or securing financing, Vista Environmental Science applies Alberta’s environmental assessment phases to deliver accurate, defensible results, on time and on budget. Contact us to schedule environmental site assessments in Calgary, completed in accordance with applicable Canadian standards.
Case Study: Navigating Gas Station Proximity with Confidence
Site: 2415 Crestwood Road SE, Calgary
Service: Phase I Environmental Site Assessment
Date: May 2025
Challenge
Vista Environmental Science was retained to complete a Phase I ESA for a multi-family redevelopment in southeast Calgary. During the assessment, a historic gas station (Ogden Gas Plus) located approximately 95 m northeast of the Site was identified. The station had a long history of underground storage tanks, fuel dispensing, and past exceedances of petroleum hydrocarbons, raising lender concerns about potential subsurface impacts.
Approach
Vista Environmental Science conducted the ESA in accordance with CSA Z768-01 and the Alberta EPA Environmental Site Assessment Standard (2016).
Key steps included:
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Regulatory and records review – Identified and reviewed multiple environmental reports for the gas station, including 2021 and 2024 groundwater monitoring programs.
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Data interpretation – Determined that exceedances were localized; the nearest monitoring well (~80 m NE) met the 2024 Alberta Tier 2 SGRG for multi-family use.
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Hydrogeology – Verified groundwater flow direction toward the southeast, away from the subject property.
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Historical aerial review – Confirmed continuous residential land use since 1957 with no on-Site sources of contamination.
Results
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No Areas of Potential Environmental Concern (APECs) were identified.
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Contamination at the gas station was attenuating and migrating away from the site.
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No Phase II ESA was required.
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The findings were accepted by the lender, allowing financing approval without delay.
Outcome
Vista Environmental Science's thorough yet efficient approach demonstrated that the nearby gas station posed a low environmental risk to the Site. By leveraging existing off-Site groundwater data and regulatory records, Vista Environmental Science avoided unnecessary intrusive work, saving the client both time and cost while ensuring compliance and lender confidence.
Land-use History Analysis for Calgary Properties
Understanding historical land use is a critical component of environmental site assessments. Past activities can influence current soil and groundwater conditions even when no visible indicators are present.
Land-use analysis may include:
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Zoning history review: Evaluation of historical zoning classifications affecting site use.
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Previous operations review: Assessment of former industrial or commercial activities.
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Redevelopment timeline review: Examination of historical construction and site modifications.
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Potential source identification: Identification of activities associated with environmental risk.
Vista Environmental Science aims to document historical activity patterns clearly and accurately.
Environmental Screening for Development and Redevelopment
Our environmental site assessments in Calgary are commonly conducted before construction or redevelopment projects proceed. Screening helps identify whether environmental considerations may affect project feasibility.
Screening activities include:
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Previous assessment review: Examination of earlier environmental reports, if available.
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Construction constraint evaluation: Identification of factors affecting excavation or development.
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Regulatory trigger review: Assessment of conditions that may require regulatory involvement.
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Site limitation identification: Recognition of environmental constraints affecting planning.
This process supports early planning and informed decision-making.
Assessment of Surrounding Land Influences
Adjacent land uses can influence environmental conditions on a subject property. Environmental site assessments include the evaluation of surrounding parcels to identify off-site risks.
Considerations may include:
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Neighbouring industrial activities: Review of nearby operations with potential environmental impact.
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Fuel-related properties: Identification of service stations or storage facilities.
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Transportation corridors: Assessment of railways, roadways, or maintenance yards.
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Historical disposal areas: Review of known or suspected landfill locations.
Understanding surrounding influences assists in identifying potential migration pathways.
Professional Interpretation and Risk Classification
Following information collection, environmental site assessments involve professional interpretation of findings. This process determines whether environmental conditions meet criteria for further investigation.
Interpretation includes:
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Environmental concern classification: Categorization of identified site conditions.
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Data reliability review: Evaluation of limitations or data gaps.
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Exposure pathway assessment: Review of potential contaminant migration routes.
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Further assessment determination: Evaluation of whether additional investigation may be required.
This step ensures conclusions are based on documented evidence.
