Specifications include, but are not limited to: Spectator Bleachers and Installation at Old Mountain Field. A. Framework: 1. Aluminum: Structural fabrication with aluminum alloy 6061-T6 mill finish. Each frame shall be unit-welded, using metal inert gas method, under guidelines by the American Welding Society. After fabrication all steel is hot dipped galvanized to ASTM A-123 specifications. All cross-bracing and horizontal bracing shall be aluminum alloy 6061-T6 mill finish. B. Extruded Aluminum: 1. Seat planks: Aluminum alloy 6063-T6, clear anodized 204R1, AA-M10C22A31, Class II with a wall thickness nominally .078" for impact and deformation resistance. 2. Tread and Riser Planks: Aluminum alloy 6063-T6, mill finish. With a wall thickness nominally .078” for impact and deformation resistance. 3. Guardrail Pipe: 1-5/8 OD schedule 40 aluminum alloy 6105-T5, clear anodized 204R1, AA-M10C22A31, Class II. C. Accessories: 1. Channel End Caps: Aluminum alloy 6063-T6, clear anodized 204R1 AAM10C22A31, Class II. 2. Hardware: Bolts and Nuts shall be hot dipped galvanized. 3. Hold Down Clip Assembly: Aluminum alloy 6063-T6 mill finish. 4. Joint Sleeve Assembly: Aluminum alloy 6061-T6, mill finish.