Section 325.51456. Periodic exposure monitoring.

(1) An employer shall periodically measure and accurately determine exposure to formaldehyde for employees shown by the  initial monitoring to be exposed at or above the action level or at  or   above  the STEL.

(2)   If the last monitoring results reveal employee exposure at or above the action level, an employer shall repeat monitoring of the employee at least once every 6 months.

(3)   If the last monitoring results reveal employee exposure at or  above the STEL, an employer shall repeat monitoring under the worst STEL conditions of the employees at least once a year.

(4)   An employer may discontinue periodic monitoring for employees   if results from 2 consecutive sampling periods taken not less than 7 days apart show that employee exposure is below the action level and the STEL.The results shall be statistically representative and consistent with the employer's knowledge of the job and work operation.

History: 1990 AACS.