RES 211231 Exhibit A - Laserfiche WebLink

City of Pleasanton–10x Genomics Project Environmental Checklist and Initial Study/Mitigated Negative Declaration Environmental Evaluation FirstCarbon Solutions 109 Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480024/ISMND/wp/21480024 10x Genomics Project Full Screencheck ISMND.docx Based on the site plans, the footprint where the heaviest construction equipment would operate would be setback from the project boundaries by a minimum of 25-feet. As described above, at this distance construction activity would result in reasonable worst-case maximum noise levels of 85 dBA Lmax as measured at the property plane of the project. Therefore, compliance with the City’s noise limit restrictions on individual pieces of construction equipment would ensure the proposed project would not result in an exceedance of the City’s construction noise performance standard of 86 dBA Leq as measured at any point outside of the property plane of the project. However, construction activities could result in a substantial temporary increase in ambient noise levels that could result in annoyance or sleep disturbance of nearby sensitive receptors, unless restricted to daytime hours. The closest noise-sensitive receptor to the project site is a residential unit located within the multi-family residential development located southwest of the project site on Stoneridge Mall Road. The façade of this residence would be located approximately 300 feet from the acoustic center of construction activity where multiple pieces of heavy construction equipment would operate simultaneously during site preparation of the proposed project site. At this distance, the reasonable worst-case construction noise levels could range up to approximately 68 dBA Lmax, intermittently, and could have an hourly average of up to approximately 58 dBA Leq, at the façade of the nearest residential receptor. According to the Section 9.04.100 of the Municipal Code, construction activities are prohibited between the hours of 8:00 p.m. and 8:00 a.m. Monday through Saturday, and between the hours of 6:00 p.m. and 10:00 a.m. Sunday and holidays. Therefore, implementation of MM NOI-1 requires compliance with the City’s construction noise regulations and the implementation of best management noise reduction measures, which would ensure that project construction activities would not result in a substantial temporary increase in ambient noise levels that would result in annoyance or sleep disturbance of nearby sensitive receptors or exceedance of the City’s construction noise thresholds, and the impact would be reduced to less than significant. Operational/Stationary Source Noise Impacts Less than significant impact. A significant impact would occur if operational noise levels generated by stationary noise sources at the proposed project site would result in a substantial permanent increase in ambient noise levels in excess of the maximum sound levels established in the City’s Municipal Code. The City’s Municipal Code restricts commercial land use operational noise levels to 70 dBA Leq for daytime hours, and to 65 dBA Leq for nighttime hours as measured the property line shared with residential land uses. As indicated in the General Plan, an increase in exterior noise levels of more than 4 decibels is considered significant. Therefore, for purposes of this analysis, an increase of greater than 4 dBA above the established noise performance thresholds would be considered a substantial permanent increase in ambient noise levels. The proposed project would generate noise from parking lot activities, new exterior mechanical equipment sources, such as rooftop ventilation systems, and from truck loading and unloading activities. Potential impacts from these noise sources are discussed below. Parking Lot Activities A surface parking lot would be located in the southeastern portion of the project site. Parking activities, including vehicles cruising at slow speeds, doors shutting, or vehicles starting, would