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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

2019 CEO Award: Award of Merit, Project Management

DST is proud to share that we have won the Consulting Engineers of Ontario Award of Merit in the Project Management category for geotechnical and instrumentation services provided to New…


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Wake the Giant in Thunder Bay

The aim of Wake The Giant is to form stronger bonds, relationships and understanding between Indigenous and non-Indigenous communities in Thunder Bay and surrounding area. Displaying this symbol outside of…


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Marketing Intern Farewell

For those of you at DST who I have not met, I am sorry that our paths never crossed. I have been working every Friday out of the Thunder Bay…


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DST at Algonquin College

On April 3rd, DST Consulting Engineers attended the Algonquin College  Professional Networking Event in Ottawa. The event gave students an opportunity to connect with environmental professionals and industry leaders from…


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Environmental Design with Youth Fusion

This past week, DST’s Kris Tuuttila has continued his mentorship through Youth Fusion/Fusion Jeunesse. As an environmental design mentor, Kris has provided guidance to students at Ogden Community Public School…


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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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