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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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