For some PCB-impacted components, it is necessary under the Code of Federal Regulations to completely remove all PCB-impacted paint (both damaged and intact) from concrete surfaces. In these situations, we remove the PCB-affected materials by scabbling or scarifying.
Depending on the size of the project and the accessibility of the concrete, we use different scarification methods. For large areas, we have a wheel-mounted, remote-controlled system that is capable of removing 250-450 square feet of concrete per hour to a depth of 1/16 of an inch. For smaller, limited access locations, we use a hand-held system that is capable of scarifying 20-30 square feet of concrete per hour to a depth of 1/16 of an inch.
During concrete scarification, we use a “dust-free” decontamination system, which incorporates a high-performance vacuum and a waste packaging unit, to reduce cross-contamination into nearby areas that are unaffected by PCBs. We will continue until that area can be considered decontaminated of PCBs with verified analytical results. Moreover, we coordinate the disposal and/or treatment of all resulting PCB-impacted waste at an approved, off-site disposal facility.