40 CFR Part 118, Appendix B — Toxicity Endpoints for Calculating Planning Distance for Fish, Wildlife and Sensitive Environments and Public Receptors
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
| Category | RQ (lbs.) | Endpoints for public receptors LD50 | Endpoints for fish, wildlife and sensitive environments using 96-hour LC50 |
|---|---|---|---|
| Mammalian toxicity (oral) (mg/kg) | 10% (mg/kg) | Aquatic toxicity (mg/liter) | 10% (mg/L) |
| Lower | Upper | Lower | Upper |
| X | 1 | 0 | 0.1 | 0.01 | 0 | 0.1 | 0.01 |
| A | 10 | 0.1 | 1 | 0.1 | 0.1 | 1 | 0.1 |
| B | 100 | 1 | 10 | 1 | 1 | 10 | 1 |
| C | 1,000 | 10 | 100 | 10 | 10 | 100 | 10 |
| D | 5,000 | 100 | 500 | 50 | 100 | 500 | 50 |