Research Article
An Evaluation of Potential Occupational Exposure to Asbestiform Amphiboles near a Former Vermiculite Mine
Table 2
PBZ data reported by activity performed, task associated with activity, PCM and TEM individual, and mean sample concentrations.
| Test activity | Test activity task | Number of samples | (a)Number of detects (PCM) | PCM conc. (fibers/mL) | (b)Number of detects (TEM) | TEM conc. 5 m (structures/mL) | TEM conc. 5 m (structures/mL) | TEM conc. total structures (structures/mL) |
| Fire Line | | 10 | 10 | | 4 | | | |
| | Brush Clearer | | | 0.354 | | 0.0277 | 0.0277 | 0.0544 | | | | 0.249 | | ND | 0.0367 | 0.0367 | | Chainsaw Operator | | | 0.384 | | ND | ND | ND | | | | 0.242 | | ND | ND | ND | | Pulaski Operator | | | 0.438 | | 0.0524 | 0.0262 | 0.0786 | | | | 0.410 | | 0.0332 | 0.0664 | 0.0996 | | Comby Operator | | | 0.446 | | ND | ND | ND | | | | 0.238 | | ND | ND | ND | | Data Recorder | | | 0.220 | | ND | ND | ND | | | | 0.117 | | ND | ND | ND |
| | Mean Concentrations | | 0.302 | | 0.011 | 0.016 | 0.027 |
| Trail Maintenance | | 5 | 5 | | 0 | | | |
| | Brush Clearer | | | 0.059 | | ND | ND | ND | | | | 0.045 | | ND | ND | ND | | | | 0.024 | | ND | ND | ND | | Chainsaw Operator | | | 0.063 | | ND | ND | ND | | Data Recorder | | | 0.015 | | ND | ND | ND |
| | Mean Concentrations | | 0.041 | | ND | ND | ND |
| Tree Measurement | Tree Measurer | 5 | 5 | | 2 | | | |
| | | | | 0.021 | | ND | ND | ND | | | | | 0.035 | | ND | 0.0162 | 0.0162 | | | | | 0.015 | | ND | ND | ND | | | | | 0.038 | | 0.0134 | ND | 0.0134 | | | | | 0.062 | | ND | ND | ND |
| | Mean Concentrations | | 0.034 | | 0.003 | 0.003 | 0.006 |
| (c)Walking | Walking | 4 | 4 | | 0 | | | |
| | | | | 0.021 | | ND | ND | ND | | | | | 0.043 | | ND | ND | ND | | | | | 0.011 | | ND | ND | ND | | | | | 0.019 | | ND | ND | ND |
| | Mean Concentrations | | 0.024 | | ND | ND | ND |
|
|
(a)PCM Analytical Limit of Detection : ( f/mL). (b)ND : Non detect, TEM analytical sensitivity : ( s/mL). (c)One walking activity PBZ sample (not reported) revealed chrysotile asbestos, not amphibole asbestos.
|