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Environmental Site Assessments

Environmental Site AssessmentsDST has conducted numerous Phase I/II/III Environmental Site Assessments across Canada. A Phase I Environmental Site Assessment consists of a review of historical reports and records, interviews, a site reconnaissance, and other research to identify potential or existing environmental contamination liabilities. This evaluation assesses the underlying condition of the land as well as historical and current usage. If significant environmental contaminating activities are discovered through the Phase I ESA, then a Phase II ESA is undertaken to confirm and describe the presence/absence and extent of contamination. This involves a review of information from the Phase I ESA and the collection of soil, groundwater, and sediment samples in order to quantitatively analyze the presence or absence of contamination. Methods used to collect samples may include the advancement of test pits, boreholes, monitoring wells, or soil vapour collection. A subsequent Phase III ESA delineation study may also be undertaken to describe the depth or spread of a contamination plume. During the Phase III ESA, we aim to further delineate the horizontal and vertical depth of contamination and will undertake further testing, sampling, and monitoring. A Phase III ESA typically also involves evaluation of remediation methods and options, costs, and feasibility of site cleanup. DST also completes National Classification System for Contaminated Sites scoring for contaminated sites under federal jurisdiction. Such studies conform to CSA standards, provincial regulations (eg. O. Reg. 153 as amended), as well as federal CCME methodologies.

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Community Events

Introducing our new Building Sciences Division

We are excited to announce our newest division: Building Sciences. This new service line includes a variety of building envelope and structural engineering services. Under the leadership and guidance of…


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Thunder Bay vs Office Flood

“Always be prepared but expect the unexpected.” Nothing can stop our Thunder Bay team – even unexpected flooding!  Luckily, we are experts in emergency response who know flood relief services.…


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DST at the Confederation College Career Fair

Our Thunder Bay team attended the Confederation College Career fair on January 30th 2019. This annual event included over 60 regional employers and saw hundreds of job seekers throughout the…


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DST Welcomes Ed Collins To The team!

We are proud to welcome Edmond Collins as our Manager of Indigenous Relations responsible for developing and strengthening relationships with indigenous community partners, implementing indigenous engagement strategies, and helping us…


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Englobe and DST Join Forces

OTTAWA, Dec. 10, 2018 /CNW/ – Englobe Corp. (“Englobe”), a Canadian leader in Soils, Material and Environmental Engineering, with an established network of more than 55 offices and 30 laboratories across…


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Blasting Videos

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Our qualified blasting engineers design more than just rock-cuts and mines. They take down structures! Reinforced concrete buildings, smokestacks, steel tanks…

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