An Evaluation of Potential Occupational Exposure to Asbestiform Amphiboles near a Former Vermiculite Mine

Table 4

Postactivity TEM chainsaw bar wipe sample results reported as concentration of amphibole asbestos <5 microns long, >5 microns long, and total structures per square centimeter.

Activity Performed	TEM (s/cm^2) <5 𝜇m	TEM (s/cm^2) >5 𝜇m	TEM (s/cm^2) Total Asbestos
Fire Line Construction	8,600	3,225	11,825
Trail Maintenance	2,688	ND^(a)	2,688
Fire Line Construction	896	ND^(a)	896

^(a)ND : NonDetect; TEM analytical sensitivity : (896 s/cm²).