Section 84.47 - What are allowable costs?(a) Allowable grant costs are limited to costs necessary and reasonable to achieve approved grant objectives and meet the applicable Federal cost principles in 43 CFR 12.62 (b).(b) If a project or facility is designed to include purposes other than those eligible under the Act, the costs must be prorated among the various purposes.(c) If you incur costs before the effective date of the grant, they cannot be reimbursed, with the exception that we can allow preliminary costs, but only with the approval of the appropriate Regional Director. Preliminary costs may include costs necessary for preparing the grant proposal, such as feasibility surveys, engineering design, biological reconnaissance, appraisals, or preparation of grant documents such as environmental assessments for compliance with the National Environmental Policy Act.