Specifications include, but are not limited to: 4.1.1 The structure shall be pre-fabricated or assembled and built on site. The method of construction to be approved by OVT SSD after reviewing bids. 4.1.2 Resistant to winds up to 120 mph, 3 second gusts to 150 mph. 4.1.3 If pre-fabricated concrete incorporated into the structure it shall be air entrained 5000 PSI lightweight concrete. The walls, floor and roof shall be poured solid. 4.1.4 Non-combustible - The walls, roof, and floor of the shelter must be non-combustible. This does not apply to the interior FRP board applied to the walls and ceiling. 4.1.5 Resistant to all boring insects walls, roof, floor and joints. Bolted and welded construction. Nailed type construction is not acceptable. 4.1.6 Resistant to mold and mildew.