Sand / Gravel Arenas, sand boxes, paver patios and soil amendments are a few applications sands are used for. Gravels are ideal for driveways, walking paths and low-cost landscape covers. Mortar Sand Leveling Sand Road Base 3/8 Chip Pea Gravel Boise River Drain 3/4" Crushed Rock 3/8 Boise River Pea Gravel Leveling Sand Mortar Sand Road Base Decomposed Granite Chip Gravel (3/4″) Chip Pea Gravel (3/8″) Boise River Drain