When properties listed on or eligible for the National Register of Historic Places are identified within the area of a federal undertaking, the agency must consult with the SHPO in accordance with 36 CFR Part 800 to determine whether or not the project will affect the property (or properties), what that effect will be, and what, if any, mitigation measures must be taken. Again, the agency will consult with the Oklahoma Archeological Survey concerning the effects of undertakings on significant archeological resources (duplicates of all material submitted to OAS must also be provided to the SHPO).

The SHPO has thirty (30) days from the receipt of adequate project documentation to issue its findings of a project's effect. The better the project information submitted to the SHPO, the quicker the SHPO can complete its review. It is understood that fully developed architectural plans and specifications will not be available for every project; however, a project must be sufficiently detailed in the submission to the SHPO to allow staff to understand exactly what work will be performed and how. Provided in the next section is guidance about the kinds of project documentation that the SHPO will need to complete its review. When rehabilitation of a historic building constitutes the undertaking, the SHPO uses the Secretary of the Interior's Standards for Rehabilitation and Guidelines for Rehabilitating Historic Buildings [Appendix I] as the basis for its review.

When there is a potential for an adverse effect on a significant archeological or historic resource, a Memorandum of Agreement will be executed to set forth the measures the agency will take to reduce the adverse effects. Additional guidance will be provided on a case-by-case basis.

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