Our 1 ½" crushed stone is widely used in dry wells, drainage solutions, road base, riprap, etc. 2 ½" CLEAN STONE . Our 2 ½" crushed stone is utilized for stone tracking pads, drainage systems, soil stabilizer etc. QP. Our QP (quarry process), a certified clean single sourced fill material, binds together to achieve a high level of compaction. It is often used as a base .