(a) Each operator shall identify and ensure, by contract or other approved means, the resources necessary to remove, to the maximum extent practicable, a worst case discharge and to mitigate or prevent a substantial threat of a worst case discharge.
(b) An operator shall identify in the response plan the response resources which are available to respond within the time specified, after discovery of a worst case discharge, or to mitigate the substantial threat of such a discharge, as follows:
| Tier 1 | Tier 2 | Tier 3 | |
| High volume area | 6 hrs | 30 hrs | 54 hrs. |
| All other areas | 12 hrs | 36 hrs | 60 hrs. |
Compiled from the Electronic Code of Federal Regulations (eCFR), an editorial compilation and not an official legal edition of the CFR. The official text is the Federal Register and the annual CFR edition. §194.115 on eCFR.