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-2a- <br />noise attenuation factor to provide the extra protection needed <br />in a noisier outdoor environment. <br />subpart 31 Item D provides that the standards for a building <br />in a Noise Area Classification 3 shall be applied to a building <br />in a Noise Area Classification 2 if the following conditions are <br />met: <br />1. The building is constructed in such a way that the <br />exterior to interior sound level attenuation is at least <br />20 dBA. <br />2. The building has year-round climate control. <br />3. toeitbuilding <br />arehas <br />intendedareas <br />forroutdooraccommodations <br />contiguous <br />activities. <br />This exception is also new; it does not appear in the existing <br />rules. The rationale for the rule is the same as that set forth <br />under the discussion in Item B: that a building with the proper <br />characteristics can be sufficiently protective so that higher <br />outdoor noise levels will be tolerable. It is reasonable to <br />allow more 'noise sensitive" land uses in Noisa Area <br />Classification Area 3 if the people in the buildings can clove <br />the windows and if the building has no areas intended for outdoor <br />activitieb. It is also reasonable, however, to require the <br />building to have at least a 20 dBA exterior to interior noise <br />attenuation factor to provide the extra protection needed in a <br />noisier outdoor environment. <br />Part %010 0060, Measurement Methodolo <br />The existing rules contain minimal provisions in respect to <br />