I will save you the trouble of looking any further then. There isnt one.
With regards to canteen/rest facilities, work out space you have and what number it can comfortably accomodate then stagger your breaktimes to suit if space is insufficient.
As for changing and drying rooms, again you will just have to work out what space you consider an individual will require to change and store/dry clothes and multiply according to no of operatives .
As long as you can demonstrate you have considered the issue of space and implemented a reasonably suitable solution that should suffice.

if you are staggering then remember that it is not directly proportional die a 12 person facility will not take 2 sittings of twelve easily as there are 24 bags to put somewhere..... and the guys can kick off very quickly over this sort of thing - happy site equals more work as less whinging and moaning.....