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•
5mm river aggregate •
5mm drainage
basalt •
10mm river aggregate •
10mm drainage
basalt •
20mm river aggregate •
20mm drainage
basalt •
40mm river aggregate •
40-50mm drainage
basalt •
100-200mm river
spalls •
100-200 basalt
rocks • Bedding
sand • Medium
sand • Road
base • Top
soil • Organic
soil • Fill
materials •
Clay materials
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