RES 211231 Exhibit A - Laserfiche WebLink

City of Pleasanton–10x Genomics Project Environmental Checklist and Initial Study/Mitigated Negative Declaration Environmental Evaluation FirstCarbon Solutions 115 Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480024/ISMND/wp/21480024 10x Genomics Project Full Screencheck ISMND.docx The closest residential receptor to the project site is the multi-family residential home located northeast of the project site on Stoneridge Mall Road. The façade of this residence would be located approximately 240 feet from the footprint of construction activity where heavy construction equipment would operate during site preparation of the proposed project site. At this distance, groundborne vibration levels would attenuate to 0.003 in/sec PPV from the operation of a small vibratory roller. This is well below the industry standard vibration damage criteria of 0.2 in/sec PPV for this type of structure, a building of non-engineer timber and masonry construction. Therefore, project construction activities would not generate groundborne vibration or groundborne noise levels in excess of the FTA impact assessment criteria for construction-related groundborne vibration. Therefore, construction-related groundborne vibration impacts to existing off-site receptors would be less than significant. Operational Vibration Impacts Implementation of the proposed project would not include any permanent sources that would expose persons in the project vicinity to groundborne vibration levels that could be perceptible without instruments at any existing sensitive land use in the project vicinity. Therefore, project operational activities would not generate excessive groundborne vibration levels as measured at off- site receptors, and the impact would be less than significant. In addition, there are no existing significant permanent sources of groundborne vibration in the project vicinity to which the proposed project would be exposed. c) For a project located within the vicinity of a private airstrip or an airport land use plan or, where such a plan has not been adopted, within two miles of a public airport or public use airport, would the project expose people residing or working in the project area to excessive noise levels? No impact. The nearest airport to the project site is the Livermore Municipal Airport, located approximately 5 miles east of the project site. Because of the distance to the project site and the orientation of the airport runways, the project site is located outside of the airport’s 60 dBA CNEL airport noise contours. The project site is not located within the vicinity of a private airstrip. While aircraft noise is occasionally audible on the project site from aircraft flyovers, aircraft noise associated with nearby airport activity would not expose people working at the project site to excessive noise levels. No impact would occur. Mitigation Measures MM NOI-1 Implementation of the following multi-part mitigation measure is required to reduce potential construction period noise impacts: • The construction contractor shall ensure that all equipment driven by internal combustion engines shall be equipped with mufflers, which are in good condition and appropriate for the equipment. • The construction contractor shall ensure that unnecessary idling of internal combustion engines (i.e., idling in excess of 5 minutes) is prohibited.