3003 W CASINO RD BLDG 45-01 2018-09-20

Page 3 of 3 GPNPP-06-0309 192 gallons (16— 12 gallon containers) of paint(Class 1B Flammable Liquid). The spraying of solvent on the airplane for cleaning is not performed simultaneously with the painting operation. The solvent and paint containers are identical and are ASME certified pressure tanks. The LEL testing performed above shows that the spray operation within the hangar does not create a hazardous level of vapors under any condition with the ventilation system in proper operation. BOE//VG The maximum allowable quantity per control area of hazardous materials by code in a building with an automatic sprinkler system is 240 gallons of storage and 60 gallons used in an open system (total of use and storage is 240 gallons). Because this facility does not exceed the maximum allowable quantity of hazardous materials we interpret the closest occupancy classification as Group S-1 Aircraft Repair Hangar. Smoke Vents/Draft Curtains Section 910.2.1 of the 2003 IBC does not require smoke vents for a Group S-1 Aircraft Repair Hangar. Since smoke and heat vents are not required the draft curtains serve no purpose and therefore are not required. This scenario was accepted by the City of Everett for the High Bay Factory 777 Expansion as well as the 45-01 and 45-04 Paint Hangars. Summary Request Please acknowledge acceptance of our request by providing a letter stating acceptance of the recommended reduction to the Class 1, Division 2 areas within all three Everett paint hangars, assigning an Occupancy Classification of S-1, and deleting the requirements for smoke and heat vents and draft curtains in the 45-03 Paint Hangar. The Boeing Company values our continued successful working relationship with the City of Everett. Should you have any questions or concerns or require additional information, please feel free to contact me. Sincer , Dirk H. Fieldcamp Jr. Civic Affairs Manager THE BOEING COMPANY (425)342-5343