Table 3.
Summary of average particle concentrations on polyvinyl chloride filters by number and mass and particle chemistry analysis by weight and number percent. StDev, standard deviation.
| Material–Run | Weight Percentages of Crystalline Silica Minerals (%) | Airborne Dust Concentrations (mg/m3) |
|||||
|---|---|---|---|---|---|---|---|
| Quartz | Cristobalite | Tridymite | Respirable | Quartz | Cristobalite | Tridymite | |
| A–1 | 52.8 | <0.4 | <0.4 | 78.9 | 41.7 | <0.3 | <0.3 |
| A–2 | 48.6 | <0.3 | <0.3 | 106.7 | 51.8 | <0.3 | <0.3 |
| A–3 | 53.0 | <0.3 | <0.3 | 111.4 | 59.0 | <0.3 | <0.3 |
| Average | 51.4 | <0.3 | <0.3 | 99.0 | 50.8 | <0.3 | <0.3 |
| St Dev | 2.5 | 0.1 | 0.1 | 17.6 | 8.7 | 0.0 | 0.0 |
| B–1 | 55.3 | <0.3 | <0.3 | 87.4 | 48.4 | <0.3 | <0.3 |
| B–2 | 51.4 | <0.3 | <0.3 | 94.3 | 48.5 | <0.3 | <0.3 |
| B–3 | 54.4 | <0.3 | <0.3 | 84.9 | 46.1 | <0.3 | <0.3 |
| Average | 53.6 | <0.3 | <0.3 | 88.9 | 47.7 | <0.3 | <0.3 |
| St Dev | 2.0 | 0.0 | 0.0 | 4.9 | 1.3 | 0.0 | 0.0 |
| C–1 | 4.9 | <0.4 | <0.4 | 77.3 | 3.8 | <0.3 | <0.3 |
| C–2 | 4.0 | <0.3 | <0.3 | 90.5 | 3.7 | <0.3 | <0.3 |
| C–3 | 4.4 | <0.4 | <0.4 | 80.0 | 3.5 | <0.3 | <0.3 |
| Average | 4.4 | <0.4 | <0.4 | 82.6 | 3.7 | <0.3 | <0.3 |
| St Dev | 0.5 | 0.1 | 0.1 | 7.0 | 0.1 | 0.0 | 0.0 |
| Granite–1 | 8.6 | <0.3 | <0.3 | 356.4 | 30.6 | <1.2 | <1.2 |
| Granite–2 | 7.9 | <0.3 | <0.3 | 420.3 | 33.3 | <1.2 | <1.2 |
| Granite–3 | 7.1 | <0.2 | <0.2 | 514.6 | 36.5 | <1.2 | <1.2 |
| Average | 7.9 | <0.3 | <0.3 | 430.4 | 33.5 | <1.2 | <1.2 |
| St Dev | 0.8 | 0.1 | 0.1 | 79.6 | 2.9 | 0.0 | 0.0 |