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ix. Section 2.1.3 also recognizes FAA aeronautical studies beyond 14 CFR Part 77 surfaces as the standard for review, "In addition to the 'imaginary surfaces,' the Commission will use all of the FAR Part 77.23 standards along with the results of FAA aeronautical studies, [emphasis added] or other studies deemed necessary by the Commission, in order to determine if a structure is an 'obstruction."' This section goes on to state: The Commission considers and recognizes the FAA as the single "Authority" for analyzing project impact on airport or aeronautical operations, or navigational -aid siting, including interference with navigational - aids or published flight paths and procedures. The Commission also considers the FAA as the "Authority" for reporting the results of such studies and project analyses. The Commission will not consider the findings of reports or studies conducted by parties other than the FAA unless the FAA certifies and adopts such findings as true and correct. X. Section 2.1.3 adds reference to FAA Advisory Circular 150/5190- 4A, A Model Zoning Ordinance to Limit Height of Objects Around Airports for Commission Review. This FAA Advisory Circular provides specific guidance for establishing zoning regulations along with specific guidance on a "variance" process for potential obstructions. At Section 3.b., "The Federal Aviation Administration (FAA) conducts aeronautical studies on obstructions which examine their effect on such factors as: aircraft operational capabilities; electronic and procedural requirements; and, airport hazard standards. If an aeronautical study shows that an obstruction, when evaluated against these factors, has no substantial adverse effect upon the safe and efficient use of navigable airspace, then the obstruction is considered not to be a hazard to air navigation [emphasis added]." A. CalTrans Division of Aeronautics — Caltrans publishes the California Airport Land Use Planning Handbook ("Handbook") in accordance with State Law with the purpose to, " provide information to ALUCs, their staffs, airport proprietors, cities, counties, consultants, and the public; to identify the requirements and procedures for preparing effective compatibility planning documents; and define exemptions where applicable (Caltrans, 2011)." The Handbook provides specific guidance for assessing potential airspace obstructions in Section 4.5 Airspace Protection. Ai. JWA — The FAA requires airport sponsors like Orange County to accept specific grant assurances when they accept federal funding. Hazard Removal and Mitigation and Compatible Land Use are two of these assurances (49 U.S.C. § 47107(a)(9) and (10)). For hazard removal, the Airport relies on the FAA's aeronautical study to meet its requirement. For compatible land Resolution No. 2020-xx 75C-805 Page 7 of 13