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Earthing ...Yes. Wait till you dig a hole and find contaminants. Civil firm I was working with had a telecoms client (big one starts with T) who gave us a job to dig a trench and haul fibre etc...Probably $40K of work being billed to the client. We struck a petroleum tank filled with 12,000...

All construction activities charge for variations. Its often how they make $. Look at pool builders. BlueHaven have never built a full completed pool for the advertised price since it doesn't include strengthening for most soils, spoil excavation and removal, rock, clay, a filter, sewer...