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...of washed river stone, or No. 8 or 89 stone above, 6-8 " of sand below || Stone 1.5"-3.5" || || Drain rock 3/4"-2.5 " washed open graded aggregate |colspan="2" style="text-align: right;| Granular Material (clear stone)(mm) || 50 || 50 || 50 || || || || ||