Borehole Decommisioning

Our services also include the backfilling of monitoring wells which have served their purpose and are no longer required, but may pose a risk of contamination due to its pathway into a major aquifer for example. Using bentonite /cement grout we are able to inject the  grout from the base of the borehole to the surface using a Tremie Pipe, and capping the borehole installation with concrete at the surface.

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Overdrilling of the existing borehole is another technique used, which involves removal of the borehole pipework, drilling out the original bore and then backfilling with grout.

These methods of grouting are carried out using Cape Sites own mixing and pumping plant which have been custom built in our own workshops.