Scientific Investigations Report 2007–5106
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5106
Table 1. Relationships between the alpha-numeric 1986 USEPA Weight-of-Evidence cancer classifications and the three equations used to calculate HBSLs.
[USEPA, U.S. Environmental Protection Agency; HBSL, Health-Based Screening Level; USEPA OW, Office of Water]
| 1986 USEPA Weight-of-Evidence Descriptors (U.S. Environmental Protection Agency, 1986) | OW equation used to calculate HBSL |
|---|---|
| A – Known human carcinogen | Cancer Risk Concentration (eq. 1) |
| B1, B2 – Probable human carcinogen | Cancer Risk Concentration (eq. 1) |
| C – Possible human carcinogen | Lifetime Health Advisory (Lifetime HA) for Group C carcinogens (eq. 2) |
| D – Unclassifiable | Lifetime HA (eq. 3) |
| E – Evidence of non-carcinogenicity for humans | Lifetime HA (eq. 3) |
| No Weight-of-Evidence descriptor, but reference dose is available | Lifetime HA (eq. 3) |
U.S. Department of the Interior |
U.S. Geological Survey
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