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If you are worried about drainage material contamination ,all that is required is a decent blinding layer,of sand, on top of the Pea metal /GAP 6 (I forget what exactly).But remember drains do not last forever and it is possible to blast out/clean out pipe drainage.
Gottcha on that. Looks like a big rock trench with pipe will be the way, with top layer sand/fines.
And a few sumps to be dug out........
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