Notes:
Air samples are taken prior to the disturbance of any asbestos containing materials. This establishes background levels of any asbestos fibers that might be in the air at that location.
In addition to baseline sampling collected prior to the abatement project commencing, air samples are collected during the removal phase of the work. Quality air assurance samples are collected inside and outside of the regulated work area(s). These samples are submitted for laboratory analysis using PCM or Phase Contrast Microscopy methods in accordance with the latest edition of the NIOSH 7400 protocol. The laboratory results during the work phase are reported within 12 hours of submission in order to determine any high fiber concentration problems that might exist inside or outside the regulated work area. If high fiber concentrations are found, the work is immediately stopped and corrective actions are implemented by the Asbestos Abatement Contractor as determined by the Asbestos Consultant. Final air clearance sampling is preformed at the conclusion of the work and prior to the tear down of the containment unit and demobilization from the work site. The purpose of the final air clearance sampling and analysis is to assure that the affected work area is clear of air borne asbestos fibers and ready for unrestricted occupancy. The protocol for the final air clearance is 5 samples inside the containment area and 5 outside the containment area. Usually, only the 5 samples collected inside the containment area are analyzed. If these samples are at or below the established clean air standards, the areas are clear for re-occupancy by the district without analyzing the 5 outside samples.