ANP.24150             Phase II

 

Are formaldehyde and xylene vapor concentrations maintained below the following maxima, expressed as parts per million?

 

	8 hr Time-Weighted Exposure Limit	15 min Short-Term Average
Formaldehyde	0.75	2.0
Xylene	100	150

 

NOTE:  Initial monitoring must be repeated any time there is a change in production, equipment, process, personnel, or control measures which may result in new or additional exposure to formaldehyde.  Periodic formaldehyde monitoring is mandated only if the initial monitoring is at or exceeds 0.75 ppm (8‑hr TWA) or 2.0 ppm (STEL).  The laboratory may discontinue periodic formaldehyde monitoring if results from 2 consecutive sampling periods taken at least 7 days apart show that employee exposure is below the action level and the short‑term exposure limit, and no change in production, equipment, process or personnel or control measures that may result in new or additional exposure to formaldehyde, and no reports of conditions that may be associated with formaldehyde exposure.  There is no requirement for periodic monitoring of xylene.