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4 Aron Faegre,AIA,PE 520 SW Yamhill Street Portland Oregon 97204 (503)222-2546 FAX/222-6529 faegrerdear hlink.net Alternative Methods Appeal for Yellow Gate Corporate Hangar Delta, Aurora Airport October 13,2017 AMA U A. Code Section for which alternative method being proposed: 412.4.6 Fire Suppression Exception 2.1 for Yard on East Exterior Wall Proposed Design: • 2 hour exterior fire rated wall of 2 layers 5/8"gyp on both faces of east exterior wall with additional sprinkler heads at openings with minimum 2 hour water supply. • Prior to Certificate of Occupancy provide either a) proof of property line now on east side of access easement, orb)record on access easement that it is also a "no build"easement. Describe Reason for Alternative: • Per Oregon Condominium Law, on completion of Hangar Delta it will be brought into the Southend Corporate Airpark Condominium. At that time per Supplemental Plat No.3: Annexation of Stage 4 the 30 foot wide yard on the east side of Hangar Delta will be part of the Condominium—thus the property line will be on the other(east) side of the 30 ft 41/ existing recorded access easement. The land use attorney tells me the access easement applies to Delta with no limitations on who can use it, so it is de facto also a public access road. • The adjacent 30 ft easement, fire lane, and yard on east side of the hangar provides good access to and clearance for hangar from a fire and life safety stand point. • The addition of a 2 hour tire rating for the hangar east wall, in conjunction with the 30 foot wide access area, provides a better than equivalent of a 60 foot yard for a similar building that did not have a fire rated east wall per NFPA standards below, Describe Why,How, etc. the Proposed Alternative is Equivalent and Meets the Intent of the Code in Terms of"Strength, Effectiveness, Fire Resistance, Durability, Health,and Safety": NFPA 409 Section 5.3.2.2 provides a reasonable standard of 25 feet minimum separation from any type or size of adjacent hangar buildings, as long as a 2 hour wall is utilized. 5,3.2.2 Where the exposing wall and any openings therein of one hangar have a minimum fire resistance rating of at least 2 hours, the minimum separation distance shall be permitted to be reduced to not less than 7.5 m (25 ft) for single hangar buildings. By providing an actual distance of 30 feet to the east property line, the proposal exceeds this 25 [' foot standard. In addition, much of the east frontage faces a parking lot with no building, so that portion actually providing the 60 feet of minimum separation from any building. The remaining 48 feet of the Delta east wall faces a Vans Aircraft material storage building(not an aircraft