Here are some common terms/definitions pertaining to dirt construction and earthwork: 
		Non Structural Fill
		 - Material not capable of supporting a
		structure without settlement.
 
		Structural Fill
		 - Material capable of supporting a minimum of 2400 psi
 
		Top Soil
		 - Organic rich soil used for landscaping
 
		Clean Fill
		 - material free of contaminants
		Weight
		 - one cubic yard of topsoil or fill dirt weighs approximatley 2400 lbs