Section 218.12 - Timing of project decision(a) The responsible official may not sign a ROD or DN subject to the provisions of this part until the reviewing officer has responded in writing to all pending objections (see § 218.11(b)(1) ).(b) The responsible official may not sign a ROD or DN subject to the provisions of this part until all concerns and instructions identified by the reviewing officer in the objection response have been addressed.(c) When no objection is filed within the objection filing period (see §§ 218.26 and 218.32 ):(1) The reviewing officer must notify the responsible official.(2) Approval of the proposed project or activity documented in a ROD in accordance with 40 CFR 1506.10 , or in a DN may occur on, but not before, the fifth business day following the end of the objection filing period.(d) When a proposed project or activity is not subject to objection because no timely, specific written comments regarding the proposal were received during a designated opportunity for public comment (see § 218.4 ), the approval of a proposed project or activity documented in a ROD must be in accordance with 40 CFR 1506.10 and 36 CFR 220.5(g) , and the approval of a proposed project or activity documented in a DN must be made in accordance with 36 CFR 220.7(c) and (d) .