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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

Bump, set, spike! Hope Beach Volleyball Tournament...

DST was a proud supporter of this year’s HOPE Beach Volleyball tournament held annually at Mooney’s Bay in Ottawa, Ontario.     The DST VolleyBrawlers had a fantastic time serving…


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DST Sudbury introduces their new laboratory!

Did you know DST Consulting Engineers has a fully certified laboratory in Sudbury, Ontario?  Forget MTV Cribs! Welcome to DST LABS, a brand new show with private tours of DST’s…


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Federal Contaminated Sites National Workshop ̵...

Real Property Institute of Canada – Federal Contaminated Sites National Workshop The RPIC Federal Contaminated Sites National Workshop is the leading professional development workshop for federal and industry environmental professionals…


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Backpack Electrofishing Certification

DST’s Biologists Antonio Trogrlic, Jody Hereema and Michaela Haring attended Backpack Electrofishing Class 2 certification this May as part of the Natural Channels Systems Conference held at the University of…


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DST Sudbury hits the links for the OIAA Northern C...

What a tee-rific day for golfing!   Our DST Sudbury office participated in the annual OIAA Northern Chapter Golf Tournament on May 24.   The weather was warm and the…


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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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