Specifications include, but are not limited to: Highway and Airport Maintenance Sand. Highway maintenance sand shall contain no muck, frozen material, roots, sticks, or deleterious material and shall be suitable for winter sanding operations. It shall consist of natural sand or manufactured sand or combinations thereof, having hard, strong, durable particles. Material from different sources of supply shall be blended uniformly. It shall have a moisture content of not more than five percent (5%) at the time of weighing. Airport maintenance sand shall contain no muck, frozen material, roots, sticks, or deleterious material and shall be suitable for winter sanding operations. It shall consist of natural sand or manufactured sand or combinations thereof, having hard, strong, durable particles. Material from different sources of supply shall be blended uniformly. It shall have a moisture content of not more than five percent (5%) at the time of delivery