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Monitoring Well Installations & Decommissioning

Monitoring Well Installations & DecommissioningDST owns a fully operational fleet of various drilling equipment used to complete boreholes and install groundwater monitoring wells for the purposes of environmental and geotechnical studies. Drillers are licensed by the Ontario Ministry of the Environment as well drillers. All monitoring well installations and decommissioning are completed under the requirements of Ontario Regulation 903 – Wells. In general, monitoring wells are constructed of 51 mm polyvinyl chloride (PVC) well materials consisting of a 0.254 mm (0.01 inch) machine slotted section installed to intersect the water table and a solid riser extending to grade. An appropriate sand pack is used to backfill the screened portion of the well and a bentonite seal will be employed in the well annulus around the riser portion to prevent surface contamination and cross contamination between water bearing formations, where applicable. All well installations are completed with either stick-up or flush mount, lockable, metal covers that are set in place with concrete. Decommissioning wells is generally completed by pumping the well from the bottom up with a bentonite slurry using a tremie pipe and then cutting off the top 1.5 m of the well (below ground surface). All monitoring well installation and decommissioning is completed under the supervision of a qualified environmental technologist under the supervision of a Qualified Person.

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Community Events

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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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

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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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