Table 1.
Types, sources, and use of data in the estimation of REC exposure levelsa
| Types of data (years covered) | Source | Use |
| Monitoring data | ||
| DEMS surveys (1998–2001) | NIOSH/NCI | Estimate 1998–2001 REC levels for underground and surface jobs |
| MIDAS (1976–2003) | MSHA | Develop models for predicting 1976–2001 CO levels for underground jobs |
| Miscellaneous (1954–1996) | State of New Mexico, MSHA, mining facilities | Develop models for predicting 1976–2001 CO levels for underground jobs (with MIDAS data) |
| Work histories (1947–1998) | Mining facilities | Identify underground and surface jobs requiring estimates |
| Job descriptions, organizational charts, and interview data (1947–2001) | Mining facilities | Develop job groups for underground and surface jobs |
| Underground determinant information from diesel equipment inventories, other records, and interview data, specifically: Diesel equipment (types, models, numbers, HP, and ADJ HP) (1947–2001); total exhaust air flow rates (1947–2001); and miscellaneous other work place characteristics (mining method, haulage method, etc.) (1947--2001) | Mining facilities | Develop models for predicting 1976–2001 CO levels for underground jobs |
| Predict 1947–2001 CO levels of underground jobs from models | ||
| Interview data and equipment inventories on surface equipment (1947–2001) | Mining facilities | Predict 1947–2001 REC levels of surface jobs |
a
Another source of monitoring data was from 1976–1977 MESA/BoM surveys (Sutton et al., 1979). These data were not used in the estimation process but were used to evaluate the estimates (Vermeulen et al., 2010a).