Enclosure System. Cover the containment floor or ground beneath the structure being prepared with air and dust impenetrable materials such as solid panels of plywood or flexible materials such as tarpaulins, if it serves as the base of the containment. Maintain the materials throughout the project to avoid losing debris through rips, tears, or breaks in the coverings. Tarpaulins are not required on the decking/containment platform unless the platform is not preventing the release of spent abrasive, dust, and debris. If spent abrasive, dust, or debris is observed falling through gaps in the decking, seal the decking so that emissions are controlled or install tarpaulins over the decking. Verify that the platform and its components are designed and constructed to support at least 4 times its maximum intended load without failure with wire cables capable of supporting at least 6 times their intended load without failure, if a suspended or elevated platform is constructed to serve as the base of the containment. Follow applicable OSHA regulations regarding scaffolding. Design each SSPC Guide 6 Class 1A or 2A containment system to meet minimum air flow velocities of 60 feet per minute down-draft or 100 feet per minute cross-draft. Remove debris from the containment materials and equipment before relocation to another point along the structure. Clean to the extent that debris or dust are not dislodged by winds or physical contact during handling and transportation.
