1 Va. Admin. Code § 30-110-80
Final clearance is achieved when using TEM analysis when the average concentration of asbestos fibers of the five air samples taken inside the abatement area is no greater than 70 structures per square millimeter. Where the volume of air collected per sample cassette is less than 1,199 liters for a 25 millimeter filter, the concentrations for both inside and outside samples must be compared by the Z test detailed in Unit IV, paragraph C, Appendix A to Subpart E of 40 CFR, Part 763 to determine if final clearance has been achieved.
Final clearance is achieved using PCM analysis when the concentration of fibers for each of five samples is less than or equal to 0.01 fibers per cubic centimeter of air.
If the sample cassettes submitted for analysis do not achieve the level of cleanliness specified above for either TEM or PCM analysis, final clearance is not achieved and the abatement site must be recleaned, and new sets of sample cassettes collected and analyzed until the abatement area passes. This process must continue until the abatement area is in compliance with the above standard.
1 Va. Admin. Code § 30-110-80
Statutory Authority
§ 2.1-526.14 of the Code of Virginia.