Referred to as ASTM, C-33 Sand refers to sand that meets specific ASTM guidelines with South West District Health. Other uses include septic mounds, PG&E bedding, high-quality permeable drain systems, masonry, playgrounds, and underneath pavers and sports fields.
Understanding Sand Terminology
Fines: tiny particles. Fines help materials compact but can also make materials dusty or dirty.
Graded: when sand is put through a specifically chosen set of screens to attain a specific distribution of sizes.
Evenly Graded: when most particles are within a limited size range.
Washed Sand: Sand is washed with water using special equipment, which removes some dust-creating fines.