W. Va. Code R. § 64-63-6 - Minimum Air Clearance Standards
6.1. A contained work area in a school shall be cleared for reoccupancy in accordance with 40 CFR Part 763, Subpart E, Asbestos-Containing Materials in Schools.
6.2. A contained work area in a building or other man-made structure which is not a school may be cleared for reoccupancy when the number of samples required by Section 5.1.f of this rule are taken, and the samples meet the following standards:
6.2.a. 0.01 f/cc (asbestos fibers per cubic centimeter) for each sample analyzed by PCM; or
6.2.b. 0.02 s/cc (asbestos structures per cubic centimeter) for each sample analyzed by TEM.
6.3. Clearance air monitoring is not required for a contained work area in a building or other man-made structure, if the building or other man-made structure is scheduled for immediate demolition.
6.4. When the ambient asbestos fiber or structure level in the air in a contained work area in a building or other man-made structure which is not a school exceeds the minimum clearance standards established in Section 6.2.a or 6.2.b of this rule, the clearance level may, with the prior approval of the director, be based on the level of asbestos fiber or structures in the air outside the contained work area. The samples of air used to determine the asbestos fiber and structure levels in the air inside and outside of the contained work area shall be taken at the same time. The number of samples collected inside and the number collected outside shall each be equal to the number of samples specified in Section 5.1.f of this rule.
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