Restoration companies and contractors in British Columbia that are about to help launch a massive flood cleanup and repair effort must be aware of the risks and hazards their work could pose to employees, says the province's worker protection agency. The risks vary depending on the flood and slide damage, but potential hazards include building materials with asbestos, chemical or biological contamination, structural or electrical damage and animal carcasses, said Barry Nakahara, WorkSafeBC's senior prevention services field manager.