- (a) The District Engineer will not undertake new scientific and technical research to inform their analyses unless that is essential to a reasoned choice among alternatives and the overall costs and time frame of such undertaking are not unreasonable. Rather, the District Engineer will make use of reliable existing data and resources.
- (b) When the District Engineer is evaluating an action's reasonably foreseeable effects on the human environment, and there is incomplete or unavailable information that cannot be obtained at a reasonable cost or the means to obtain it are unknown, the District Engineer will make clear in the relevant environmental document that such information is lacking.