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John, if you are willing to toss a little extra coin into you project, your could use what NYSDOT calls 50 year pavement...
A well prepared subgrade.... then a few inches of what is called "popcorn" by the workers...it is "permeable base material" in the spec.. simply 5/8-3/4 stone, cement, and water.... no fine aggregates
Place a base of 3-4 in popcorn compact with a plate tamper... install some vapor barrier... 6 mil poly should be fine... then your slab with reinforcement on chairs..
Though a layer of plastic and a slab reinforced with wire mesh will outlast you and the next few owners..
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