Document 1KXqXQ07nzjE8VDY5OqrMOKZ

Vinyl Chloride Monitoring TO* Our reoords of Vinyl Chloride sampling you haee porfoinod In your plant to sralnate saployee exposure show that ataospherlo onnoentrationa art belov both tbo aetloa level of 0*5 PPM, 8-hoar time-weighted average, and tbo coiling oeneontratlao of $ PPM, 15 nlmto period. There fore, aa apociflod la tho federal Register, 1910,93 q (d) (2)(ill), sampling aay bo dloeontlnaod when at loaat tvo oonaooatlTa aoaltorlag determinations, nada not laaa than 5 working day* apart, abov exposures at or balov tbo action level. However, whenever a prodaetlon, proooaa, or oontrol ehango la made that aay result la aa Increase la atmoapharie Vinyl Chloride concentrations, or tAenever It la suspected that the ataespbsrlo concentration exceeds the aetloa level, monitoring should be performed immediately. In addition, to sore that atwoepbarlo Vinyl Chloride ooaoantrationa main belov tbo aetloa level. It la roccaaended that routine, sMleaanal monitoring be performed. Corporate Industrial Hygiene 0036177