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City of Pleasanton–10x Genomics Project Environmental Checklist and <br />Initial Study/Mitigated Negative Declaration Environmental Evaluation <br /> <br /> <br />FirstCarbon Solutions 113 <br />Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480024/ISMND/wp/21480024 10x Genomics Project Full Screencheck ISMND.docx <br />Roadway Segment <br />CNEL (dBA) 50 feet from Centerline of <br />Outermost Lane <br />Near-term <br />(dBA) CNEL <br />Near-term Plus <br />Project (dBA) <br />CNEL <br />Increase over <br />Near-term <br />(dBA) CNEL <br />Stoneridge Drive–Springdale Avenue to Stoneridge Mall Road 69.6 69.9 0.3 <br />Stoneridge Drive–east of Stoneridge Mall Road 71.9 72.1 0.2 <br />Notes: <br />dBA = A-weighted decibel <br />CNEL = Community Noise Equivalent Level <br />Source: FCS 2021. <br /> <br />Table 22: Far-term Traffic Noise Model Results Summary <br />Roadway Segment <br />CNEL (dBA) 50 feet from Centerline of <br />Outermost Lane <br />Far-term <br />(dBA) CNEL <br />Far-term Plus <br />Project (dBA) <br />CNEL <br />Increase over <br />Far-term <br />(dBA) CNEL <br />Stoneridge Mall Road–north of Stoneridge Drive 65.0 65.0 0.0 <br />Stoneridge Drive–west of Springdale Avenue 68.1 68.3 0.2 <br />Stoneridge Drive–Springdale Avenue to Stoneridge Mall Road 69.8 70.0 0.2 <br />Stoneridge Drive–east of Stoneridge Mall Road 72.0 72.2 0.2 <br />Notes: <br />dBA = A-weighted decibel <br />CNEL = Community Noise Equivalent Level <br />Source: FCS 2021. <br /> <br />The highest traffic noise level increase with implementation of the proposed project would be an <br />increase of 0.4 dBA along Stoneridge Drive from Springdale Avenue to Stoneridge Mall Road, during <br />Existing Plus Project conditions. This increase is well below a 4 dBA increase that would be <br />considered a substantial permanent increase in traffic noise levels compared with traffic noise levels <br />that would exist without the proposed project. Therefore, project-related traffic noise impacts would <br />not result in a substantial permanent increase in ambient noise levels in the project vicinity and the <br />impact would be less than significant. <br />It should also be noted that the highest traffic noise levels along roadway segments adjacent to the <br />project site would be 70 dBA CNEL, under cumulative conditions, as measured at 5-feet from the <br />centerline of the outermost travel lane. These noise levels are considered normally acceptable for <br />new office land use development according to the City’s noise and land use compatibility guidelines. <br />Therefore, traffic noise levels would not result in a land use compatibility conflict for the proposed <br />project and the impact would be less than significant.