Can the employer use monitoring data that were obtained prior to the effective date of the standard?
A. An employer can use monitoring data that were obtained within 2 years prior to the effective date of the standard to meet the initial monitoring requirements. The data shall have been obtained under workplace conditions closely resembling the current processes, type of materials, control methods, work practices, and environmental conditions. Paragraph (d)(2)(ii) (FR page 56806) Q. If the initial monitoring exposures indicate that the exposures are at or above the AL, but at or below the TWA and STEL, how frequently does the employer have to sample? A. Representative monitoring shall be conducted every 12 months. Paragraph (d)(3) Q. If initial monitoring indicates that the exposures are above the TWA or the STEL, how frequently does the employer have to sample? A. Stated more simply, the requirements in paragraphs (d)(3)(ii) and (iii) require the employer to take a total of eight samples within a two-year timeframe. The employer can take the eight samples in less than 2 years if they
