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design condition. Given the noncombustible, sprinklered <br /> construction of all connected buildings and airlocks, restricted <br /> contents and use of the airlocks and generous fire separation <br /> distances, there appears to be little cause for concern <br /> originating from the simultaneous opening of both airlock doors . <br /> There is only one very hypothetical question that might be raised. <br /> That has to do with the potential migration of byproducts of <br /> combustible or flammable cleaning, sealing and painting operations <br /> conducted in Buildings 40-51 and 40-37 . Although building <br /> ventilation requirements are designed to prevent the accumulation <br /> of hazardous vapors, it would be reassuring to know that <br /> ventilation systems perform as intended. For that reason, I <br /> recommend performing airflow tests to validate the proper function <br /> of C, S & P ventilation systems during spray operations. Should <br /> airflow relative to the 40-51 and 40-37 buildings be neutral to <br /> negative, any concern about the simultaneous opening of airlock <br /> doors would be minimized. <br /> in my opinion, there are no current specific IBC provisions that <br /> would preclude both airlock doors being open simultaneously for <br /> any period of time. Given the fact that one of the connected <br /> buildings, in each case, is a Group H-2 Occupancy, it is <br /> recommended that this opening configuration be minimized as a <br /> common sense operational practice. Also recognizing that this is <br /> a somewhat unusual design circumstance that one would not <br /> necessarily expect to be typically addressed through IBC <br /> provisions, I recommend that The Boeing Company develop a detailed <br /> airlock door operation procedure that would satisfy company <br /> production needs while ensuring that potential risks are <br /> minimized. I also recommend that this procedure be presented to <br /> the City of Everett for review and approval based on the premise <br /> that they were involved in the development of the current door <br /> openin rocedure. <br /> Vne <br /> Plsitate in contacting me at your earliest <br /> cold you require any further assistance in this or <br /> nelated matter. <br /> G , CBO <br /> P <br />