TABLE III.
Process information, ventilation measurements, and process duration TWAs
| Measurement Location or Job Class | What was Measured (units) | F-18 Painting Bay 6 (Initial Survey) | N | E-2 Painting Bays 7–8 (Post-mod) | N | C-2 Painting Bays 7–8 (Post-mod) | N | F-18 Painting Bay 2 (Post-mod) | N |
|---|---|---|---|---|---|---|---|---|---|
| Mid-Hangar | Mean Velocity, m/s (fpm) | 0.528 (104) | 20 | 0.412 (81.1) | 8 | 0.412 (81.1) | 8 | 0.406 (80.0) | 8 |
| Paint Quantity (gal) | 13 | 1 | 16 | 1 | 18 | 1 | 13 | 1 | |
| Paint Formula HDI monomer/HDI oligomer (% NCO) | 0.143/9.97 | 1 | 0.022/4.53 | 1 | 0.016/5.16 | 1 | 0.043/9.27 | 1 | |
| Sprayer mean/gmean [range] | HDI monomer (μg/m3) | 33.1/32.2 [25.0, 49.6] |
6 | 11.3/10.5 [6.06, 14.2] |
3 | 7.31/7.25 [6.37, 8.26] |
2 | 30.9 | 1 |
| HDI oligomer (μg NCO/m3) | 279/259 [178, 484] |
6 | 191/169 [78.6, 265] |
3 | 242/242 [240, 245] |
2 | 725 | 1 | |
| TPM (mg/m3) | 20/18 [7.0, 26] |
6 | 14 | 1 | |||||
| Cr[VI] (μg/m3) | 530/500 [220, 650] |
6 | 360 | 1 | |||||
| Hoseman mean/gmean [range] | HDI monomer (μg/m3) | 6.19/3.99 [<0.7, 11.3] |
6 | 3.88/3.62 [2.49, 5.27] |
2 | 19.6 | 1 | ||
| HDI oligomer (μg NCO/m3) | 81.7/42.7 [<3, 153] |
6 | 61.5/54.9 [33.8, 89.2] |
2 | 673 | 1 | |||
| TPM (mg/m3) | 5.2/4.3 [1.4, 10] |
6 | 5.9 | 1 | |||||
| Cr[VI] (μg/m3) | 150/120 [37, 300] |
6 | 170 | 1 |
Note: Values below the LOQ (indicated by the < symbol) were divided by √2 for calculation of means.