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Aron Faegre,AlA,PE 13200 Fielding Rd. Lake Oswego Oregon 97034 503-880-1469 faegre@carthlink.nel Alternative Methods Appeal for Blue Gate Hangar 3,3,Aurora Airport 41/ March 16, 2023 r frr Code Section for which alternative method being proposed: 412.4.3 Floor Surface.Floors shall be graded and drained to prevent water or fuel from remaining on the floor. Floor drains shall discharge through an oil separator to the sewer or to an outside vented sump. Proposed Design: A written containment plan is provided as follows and this plan shall be permanently posted on the wall beside each man door: Floor Cleaning Requirement for this Hangar: 1. Floors shall be cleaned by mechanical floor cleaning equipment with all products collected by the equipment and disposed of as hazardous material. 2. Floor cleaning shall never result in the release of water or other material to the exterior of the building or the septic system. Describe Reason for Alternative: 4111,. 1.Flat hangar floors promote safety of hangar operations because it reduces the risk of aircraft inadvertently rolling on their own and being damaged. 2. Aviation users prefer to control any drips of oil or grease from their aircraft by direct collection and proper disposal, because for safety reasons they prefer to track any oil leakage as a safety issue for aircraft operations. 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": This alternative promotes aviation safety by minimizing of inadvertent movement of aircraft in the hangars. It further is consistent with aircraft maintenance practices which include direct monitoring of any oil drips which appear on the hangar floor. Modern hangar floor cleaning equipment is capable of collecting any oil or other floor drips and providing methods for proper disposal. This was an approved alternative in the 2007 OSSC and has proved successful for the buildings constructed in that era, so we would like to continue it.