For Class I and II work in the regulated area: daily monitoring representative of each employee's exposure unless the employer has a negative exposure assessment for the entire operation
All other operations: periodic monitoring sufficient to document the exposure
Exception: employees doing Class I work who are using a control listed in (g)(4)(i), (ii), or (iii) and employees doing Class II work may be equipped with supplied-air respirators operated in the positive pressure mode in lieu of daily monitoring