The Goretex idea would work, as would breathable waders, both if used with strap on kneeling pads. Unfortunately, both would be expensive and last for a very limited time, waterproof membranes don't like being knelt on.
In all honesty, if it's going to rain hard enough to soak you to the skin, you're better off staying at home as you'll turn the site into a second Somme anyway. Easy for me to say, it's my company...
The Goretex idea would work, as would breathable waders, both if used with strap on kneeling pads. Unfortunately, both would be expensive and last for a very limited time, waterproof membranes don't like being knelt on.
In all honesty, if it's going to rain hard enough to soak you to the skin, you're better off staying at home as you'll turn the site into a second Somme anyway. Easy for me to say, it's my company...