Day 592: Oeps!
The outside store room needed a 75mm Ø hole in the floor to
allow for a grey water pipe between the basement storage tank and the ground
floor garden tap. We rented a core drill to make a smooth hole through the
concrete slab without damaging the polished concrete floors. The operator pumped
water into the drill to increase the pressure while drilling. The core drill
process takes about an hour. During this time someone calls me to tell me there
is a water leak in the electrical duct. Upon inspection I realise that there is
water spouting from a conduit cast into the ground floor slab. The only active
water on site was used for the core drill. Slow realisation dawned that we must
be drilling through one of the conduits which was cast into the slab. I
patiently waited for the process to complete, leaving a nice round hole in the
floor and a smooth cylinder concrete which reveals that we drilled through two
conduits and not just one! My electrician is not going to be impressed…
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