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3987 Stanley Environmental Noise Assessment 4 March 2017 (revised 4 August2017) Page 2 INTRODUCTION This report summarizes our environmental noise study for 3987 Stanley Drive, a single family home development in Pleasanton. The purpose of the study was to quantify the noise environment at the proposed site, compare it with applicable City and State noise standards, and propose noise attenuation measures where necessary to comply with these standards. For those readers unfamiliar with environmental acoustics, Appendix A has been included at the end of this report for further explanation. CRITERIA P/easanton Genera/ P/an The applicable acoustical criteria are contained within Policy 1 and 3 of Chapter 11: Noise Element in the Pleasanton General Plan 2025 and the California Building Code. Policy 1: Require new projects to meet acceptable exterior noise level standards. Program 1.1: Use the normally acceptable designation and test description contained in Table 11-5 `Noise and Land - Use Compatibility Guidelines,' to determine the acceptabilit}' of necv development and to determine when noise studies are required For nett- single-family- residential development, maintain a maximum day/night average noise level standard of GO dBA Lae for exterior noise in private or shared outdoor use areas excluding front yards. For neve multi -family residential deezlopment, maintain a maximum standard of 65 dBA Lae in community outdoor recreazion areas (or 60 dBA Lae erhen the outdoor noise is due to aircraft). Noise standards are not applied to balconies or front }ands. In the Dov�mtovvn, the City' Council will evaluaze the requirement to achieve these standards on a case-bycase basis. Program 1.2: Where high noise levels are the result of railroad trains, an exterior noise level of up to 70 dBA Lae would be considered eompazible with mast residential dee-elopment mognizing that day=night asYrage noise levek are controlled by intermittent, loud ee%ents. Vibration-sensitie.-e land usa located near the Union Pacific Railroad track should demonstrate compatibility- kith the Federal Transit Administration's vibration impact criteria by completing sitespecific vibration analyses. Program 3.2: Require noise-aztenuation measures when necessary -to ensure thaz interior noise les�ek for neR• single- and multi -family residences do not exceed 45 dBA Lae_ Interior noise lec�ek shall not exceed 43 dBA Lae in am.• nen' residential units (single and multi family�j. De�Ylopment sites exposed to noise 1es41s exceeding 60 dBA Lae. shall be anah�d follooving protocols in Appendix Chapter 12, Section 1208, A, Sound Transmission Control, 2001 (tumor) California Building Code, Section 1207. Program 3.3: Necv residential de�Ylopment affected by noise from railroad trains and aircraft shall be designed to limit typical maximum instantaneous noise levels to 50 dBA in bedrooms and 55 dBA in other rooms. Ca/ifornia Bui/ding Code 2016 Section 104.7 —Allowable interior noise levels. Interior noise levels attributable to exterior sources shall not exceed 45 dB in any habitable room. The metric shall be either the day -night average noise level (Ldn) or the community noise equivalent level (CNEL), consistent with the noise element of the local general plan. Federal TransitAdministration Chapter 9 of the FTA Handbook describes a preliminary screening process to determine the likelihood that a new transit project would cause a vibration disturbance to adjacent land uses. This same screening process may be applied to determine the critical distances in which existing transit vibration sources may be an issue for new sensitive land uses. The proposed residential project is categorized as Type 2 per Chapter 9 of the FTA handbook. At this distance, the minimum critical distance is 200 feet from any rail line. For any Type2 project within 200 feet of a rail line, FTA would advise further investigative study to determine any potential impacts from rail and transit. The proposed Stanley housin development is almost 500 feet from the nearest rail line. At