Table 3.
Concentration of RCS and RD measured from stationary area samples at the perimeter of demolition and crushing sites.
| Site ID | Activity | Number of samples | Average sampling duration (min) | Respirable silica conc. (µg/m3) | Respirable dust conc. (µg/m3) | |||
|---|---|---|---|---|---|---|---|---|
| % non-detect. | GM (GSD) | Range | GM (GSD) | Range | ||||
| A | Demolition | 12 | 339 | 25% | 3.2 (3.0) | Nda–12.0 | 53.6 (3.1) | 12.0–745.8 |
| B | Demolition | 15 | 259 | 100% | Nd | Nd | 20.1 (3.6) | 2.8–395.8 |
| C | Crushing | 6 | 244 | 0% | 33.3 (2.8) | 13.0–239.6 | 218.2 (1.9) | 83.9–613.0 |
aNd = Non-detectable levels.