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Page 2 <br /> K. Carlson <br /> 4-3212-4-389 <br /> This is unlikely. However, Class I Division 1 , Group C and D, equipment <br /> already exists in the basement. A spill of solvent in the basement should <br /> have no effect on the air passing through the high bay supply plenum during <br /> painti�ig or priming. This has been field verified by Boeing Site SHEA-Safety <br /> as contained in the reference (b) study. The study showed a maximum reading <br /> of .62% of the LEL for tolulene a�d this was in the southeast basement plenum <br /> of the sub�ect hangar during surface preparation of the aircraft skin (ie. <br /> prime coat washdown) . <br /> This information should be summarized further and supplied to the City of <br /> Everett for review prior to construction. Concurrence on the study by the <br /> City of Everett could mean eliminating the requireme�t for Class I equipment <br /> in the high bay supply plenum. This translates into a dollars savin9s. The <br /> basement will remain Clas� I Division 1 . The hangar floor itself will remain <br /> status quo with a rating af Class I Division 1 ar�d/or 2, Group C and D, as <br /> defined previously. <br /> � -1(��- �.�� <br /> � � th <br /> J. J. Hollingswor <br /> 4-32312 3U-84 <br /> 657-9703 <br />