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Please be aware that many dual-pane window and glass door assemblies have inherent noise reduction problems in the railroad and traffic noise frequency spectra due to resonance that occurs t.,ithin the air space between the window lites. and the noise reduction capabilities vary from manufacturer to manufacturer. Therefore. the acoustical test report of all sound rated windows and doors should be reviewed by a qualified acoustician to ensure that the chosen windows and doors will adequately reduce railroad and traffic noise to acceptable levels. All windows and doors must be of good quality and provide tight seals to prevent sound infiltration. To achieve an acoustically-effective window construction. sliding panels must form an air-tight seal when in the closed position. In addition. the window and door frames must be caulked to the wall opening around their entire perimeter with a non-hardening caulking compound or acoustical sealant. When windows are maintained closed for noise control. they are to be operable, as the requirement does not imply a "fixed" condition. Also. under the closed window requirement some type of mechanical ventilation should be provided to assure a habitable environment. as specified by the Uniform Building Code (UBC) and described in Appendix B. In addition. general construction measures to assure an acceptable acoustical environment are recommended. as described in Appendix B. The implementation of the above recommended measures will reduce interior noise exposures to 45 dB DNL or lower and to 50/55 dBA L,,,;,, to comply with the standards of the City of Pleasanton Noise Element. C. Railroad Induced Ground-borne Vibration To achieve compliance with the 80 VdB criterion of the PT.A_ one of the following alternative measures will be required. Alternative I Construct of the homes on Lots 6. 7 and 8 on spread footing or postibeam foundations rather than slab on-grade foundations.