The agency official should make every effort to coordinate its Section 106 review with its overall environmental assessment, per its established NEPA procedures. [36 CFR 800.8]
The Council on Environmental Quality and the Advisory Council on Historic Preservation have published guidance on how to integrate NEPA and Section 106, through coordination or substitution. See the Handbook for Integrating NEPA and Section 106.
The agency official should use its existing procedures for public involvement under NEPA or other program requirements to also provide opportunities for public involvement consistent with Section 106 requirements. [36 CFR 800.2(d)(3)]