TABLE II.
Lead Exposure Assessment
| Department | NIOSH (1975) | OSHA sampling (1973–1980) | ||
|---|---|---|---|---|
|
| ||||
| Original lead exposure assessment | No. samples | No. unique job titles sampled | Average lead TWA (mg/m3)a | |
| Sinter plant, Lurgi | High | 13 | 6 | 2.34 |
| Charge preparation | High | 26 | 11 | 1.68 |
| Blast furnace | High | 23 | 8 | 1.25 |
| Slag fuming furnace | High | 21 | 8 | 0.68 |
| Lead refinery | High | 17 | 8 | 0.55 |
| Cadmium refinery | High | 4 | 2 | 0.49 |
| Silver refinery | High | 12 | 4 | 0.28 |
| Materials recovery | High | 7 | 2 | 0.10 |
| Concentrator | Low | 0 | 0 | 0.06b |
| Casting and loading | Low | 9 | 3 | 0.06 |
| Electric furnace (hard lead) | Low | 0 | 0 | 0.06b |
| Quality control | Low | 0 | 0 | 0.06b |
| Maintenance | High | 11 | 4 | 0.06 |
| Yard crew, labor pool, bull gang | Low | 0 | 0 | 0.06b |
| Total | 143 | 56 | ||
a
Samples were first averaged over each unique job title, then the job title averages were again averaged within each department.
b
The concentrator, electric furnace, and quality control departments as well as the yard crew, labor pool, bull gang department were not sampled and so a value of 0.06 mg/m3wasassignedsincethiswastheaveragelevelsampledfor thecasting andloading department andthese departmentswerepreviouslygrouped together in the low grouping.