03/09/2025
Safe Decommissioning of a Redundant Well
A Case Study by Mark and Mike
Summary: At Drift, we don’t just drill wells – we decommission them too (not usually the same wells, just for clarification...)
https://lnkd.in/eCfnC3H5
On a residential housing development somewhere in Hampshire (posh postcode that), our top-most team was summoned by Richard Lane to make safe a redundant well discovered during construction.
The challenge was to backfill and seal the structure in line with Environment Agency requirements, protecting the aquifer and ensuring the site was safe for ongoing works.
The Challenge:
1) Get Christian Cox out of bed and to site.
2) Sort out a disused well, measuring 7.4 metres deep with water at surface level.
It was found in the middle of the development area. Leaving it open posed a bit of a safety risk and a potential contamination pathway to groundwater. The solution needed to be robust, environmentally responsible, and delivered quickly - so construction could continue without delay.
Step 1 - Mobilisation
Gravel, cement and Christian Cox were delivered to site, and Mark Gratton completed inductions before setting up. Kettle on, water was pumped from the well and stored to be reused in the grouting process, minimising waste.
(You could call us tight – but we’re wedded to saving costs for clients and preventing damage to the environment - so save your sass).
Step 2 - Backfill & First Grout Pour
Gravel was placed into the well in controlled increments, carefully measured at each stage.
Once the base was stabilised, a cement mix was poured to seal the lower section, curing overnight.
A filter sock was fitted to ensure no sediment entered nearby watercourses (we just used one of Mark Smith's old toe rags)…
Step 3 - Final Fill and Clear Off
The next day, inspection confirmed a solid base...and, it’s all about that base.
Additional grout mixes were poured until the well was completely sealed to ground level.
The site was cleared, equipment was washed down, and the area was reinstated to its original condition – but this time without the unexpected wet hole.
The Outcome?
The well was fully and safely decommissioned, eliminating risk to groundwater and ensuring the construction site could progress safely. By combining technical expertise with practical, environmentally sound solutions, we delivered peace of mind to the client and protection for the local environment.
And much like the well - could this case study BE any drier?
I know, Drifters, it's not what you expect. But Paddy and Rich said my last post was 'too much' ... so Mark Gratton now has to keep me on a level.
Enjoy.