All asbestos-containing materials (ACM) must be identified during initial site assessment before any work begins. Friable asbestos insulation, gaskets, and coatings require special removal procedures by licensed asbestos contractors. Non-friable asbestos in floor tiles, roofing, and other products may be left in place if it is not disturbed, but must be labeled and tracked. Disturbance of asbestos requires notification of the California Division of Occupational Safety and Health (DOSH) or equivalent state agency at least 10 days before work begins. Only licensed asbestos abatement contractors may remove asbestos. Work areas must be isolated with barriers and negative pressure enclosures to prevent fiber release. Air monitoring during asbestos removal must verify airborne fiber concentrations are below action levels. Personal protective equipment including respirators must be provided to all workers potentially exposed to asbestos fibers. Respiratory protection programs must include fit testing, training, and medical evaluation. Asbestos waste must be packaged in leak-tight containers labeled with asbestos warning labels. Waste must be transported by licensed contractors to approved disposal facilities. Medical surveillance must be provided to workers potentially exposed to asbestos dust. Employers must maintain records of asbestos activities for 30 years. All employees must be trained on asbestos hazards and control measures before potential exposure.