Table 2.
Full-shift and half-shift samples during clutch and brake work.
| Sample | Duration (hr) | Volume (L) | PCM—fiber concentration (f/cc) | PCME—chrysotile concentration (f/cc) |
|---|---|---|---|---|
| Indoor | ||||
| Personal—day 1 | ||||
| Full-shift | 6.15 | 380 | 0.0136 | 0.0053 |
| 1st half-shift | 3.33 | 391 | 0.0182 | 0.0132 |
| 1st half-shift | 3.30 | 388 | 0.0278 | 0.0225 |
| 2nd half-shift | 2.75 | 330 | 0.0163 | 0.0077 |
| Average full-shiftA,B | 0.0168 | 0.0093 | ||
|
| ||||
| Personal—day 2 | ||||
| Full-shift | 8.45 | 510 | <0.0053 | — |
| 1st half-shift | 3.62 | 215 | <0.0125 | — |
| 2nd half-shift | 4.78 | 285 | 0.1454 | 0.1454 |
| Average full-shiftA,C | 0.0414 | 0.0414 | ||
|
| ||||
| Personal—day 3 | ||||
| Full-shift | 6.42 | 360 | 0.0368 | 0.0359 |
| 1st half-shift | 2.70 | 161 | 0.096 | 0.0960 |
| 2nd half-shift | 3.67 | 205 | 0.0215 | 0.0215 |
| Average full-shiftA | 0.0449 | 0.0445 | ||
| Average full-shift—days 1, 2, and 3 | 0.0344 | 0.0317 | ||
|
| ||||
| Area: 1.5 m from crane | ||||
| Day 1—crane 22B | 6.40 | 1922 | 0.0029 | 0.0012 |
| Day 2—crane 22B | 9.02 | 2696 | 0.0028 | 0.0025 |
| Day 3—crane 15B | 6.73 | 2019 | 0.0030 | 0.0030 |
| Average full-shift | 0.0029 | 0.0023 | ||
|
| ||||
| Area: 4.6 m from crane | ||||
| Day 1—crane 22B | 6.28 | 1907 | 0.0017 | 0.0009 |
| Day 2—crane 22B | 8.92 | 2899 | 0.0035 | 0.0035 |
| Day 3—crane 15B | 7.93 | 2381 | 0.0027 | 0.0027 |
| Average full-shift | 0.0026 | 0.0024 | ||
|
| ||||
| Area: 9.1 m from crane | ||||
| Day 1—crane 22B | 5.62 | 1686 | 0.0019 | 0.0011 |
| Day 2—crane 22B | 8.93 | 2659 | 0.0048 | 0.0047 |
| Day 3—crane 15B | 8.28 | 2474 | 0.0018 | 0.0017 |
| Average full-shift | 0.0028 | 0.0025 | ||
|
| ||||
| Area: 4.6 m from workbench | ||||
| Day 1 | 6.07 | 1850 | 0.0025 | 0.0008 |
| Day 2 | 8.93 | 2744 | 0.0029 | 0.0028 |
| Day 3 | 8.80 | 2688 | 0.0036 | 0.0036 |
| Average full-shift | 0.0030 | 0.0024 | ||
|
| ||||
| Area: 9.6 m from workbench | ||||
| Day 1 | 5.78 | 1750 | 0.0029 | 0.0016 |
| Day 2 | 8.98 | 2744 | 0.0038 | 0.0038 |
| Day 3 | 8.87 | 2691 | 0.0032 | 0.0032 |
| Average full-shift | 0.0033 | 0.0029 | ||
|
| ||||
| Outdoor | ||||
| Day 1—full shift | 7.33 | 2380 | <0.0011 | — |
| Day 1—full shift | 7.33 | 2197 | <0.0012 | — |
| Day 2—partial shiftD | 5.47 | 1761 | <0.0015 | — |
| Day 2—partial shiftD | 3.82 | 1142 | 0.0034 | 0.0034 |
| Day 3—full shift | 7.42 | 2202 | <0.0012 | — |
| Day 3—full shift | 7.32 | 2144 | <0.0013 | — |
| Average full-shiftC | 0.00047 | 0.00047 | ||
AThe half-shift samples were averaged (weighted by time) to calculate a second full-shift concentration for each day. The measured and calculated full-shift concentrations were averaged to yield the daily average full-shift concentration. BOn day 1, there were two samplers consecutively operating for the duration of the first half of the shift. These two samples were averaged together before the calculations described in footnote (a) were carried out. CTo calculate an average concentration, PCM measurements below the analytical sensitivity were assigned a value of zero. Likewise, the corresponding chrysotile-specific concentrations (PCME) were assumed to be zero. D On day 2, outdoor sampling was conducted at a single location. The sampling stand blew over part way through the day, at which time the sampler was replaced. The full-shift TWA concentration for day 2 is 0.0014 f/cc (PCME).