Where the employer has relied on historical monitoring data to determine exposure to chromium (VI), the employer shall establish and maintain an accurate record of the historical monitoring data relied upon.
The employer shall ensure that historical exposure records are maintained and made available in accordance with 29 CFR 1910.1020.
The data were collected using methods that meet the accuracy requirements of paragraph (d)(5) of this section;
The processes and work practices that were in use when the historical monitoring data were obtained are essentially the same as those to be used during the job for which exposure is being determined;
The characteristics of the chromium (VI) containing material being handled when the historical monitoring data were obtained are the same as those on the job for which exposure is being determined;
Environmental conditions prevailing when the historical monitoring data were obtained are the same as those on the job for which exposure is being determined; and
Other data relevant to the operations, materials, processing, or employee exposures covered by the exception.