Table 2.
Measurements in the work environment
| Measured results (mg/ m 3 ) | OEL (TWA, mg/ m 3 ) | Initial measurement December 9, 2013 | Follow -up measurement February 4, 2014 | ||||
|---|---|---|---|---|---|---|---|
| Primary operator | Assistant operator | Primary operator* | Assistant operator* | Area sample of the melting furnace | Area sample of the molding frame | ||
| Lead | 0.05 | 0.0073 | ND | 0.0013 | 0.0394 | 0.0310 | 0.0225 |
| Nickel | 0.5 | 0.0003 | ND | 0.0002 | 0.0001 | 0.0001 | ND |
| Tin | 2 | 0.0036 | 0.0002 | ND | ND | ND | ND |
| Cooper | 1 | 0.0006 | 0.0003 | 0.0032 | 0.0013 | 0.0009 | ND |
ND, not detectable; OEL, occupational exposure limit; TWA, time-weighted average.
*New workers were assigned after the primary operator and his assistant were transferred out of the foundry.