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3_Exhibit B
City of Pleasanton
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BOARDS AND COMMISSIONS
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PLANNING
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AGENDA PACKETS
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2020 - PRESENT
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2023
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02-22
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3_Exhibit B
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Last modified
2/16/2023 1:15:46 PM
Creation date
2/16/2023 1:06:44 PM
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CITY CLERK
CITY CLERK - TYPE
AGENDA REPORT
DOCUMENT DATE
2/22/2023
DESTRUCT DATE
15Y
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\BOARDS AND COMMISSIONS\PLANNING\AGENDA PACKETS\2020 - PRESENT\2023\02-22
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Ramboll - Stoneridge Mall Residential Project <br />158850326.2 <br />6/11 <br />Confidential <br />Figure 1. Outdoor Activity Areas Highlighted in Red. <br />The Ldn at the two outdoor courtyards and two rooftop decks were predicted using CadnaA, an <br />environmental noise modeling program that conforms to ISO 9613 and ISO 17534. The calculation <br />method used was based on the FHWA’s Traffic Noise Model (TNM) version 2.5. The sound sources in the <br />model included local roadways (e.g., Stoneridge Road), I-580, and I-680. Because MM 4.J-5c refers to <br />traffic noise only, the model only considered roadways and did not consider sound from other sources <br />such as stationary sources or rail lines. <br />For local roads, Ldn data used in the model was based on Table 4.J-7 of the Draft SEIR, which provides <br />cumulative 2035 data that includes estimated sound level increases from rezoning the Project site and <br />other potential housing sites. In addition, the results of the project traffic noise impact study completed <br />by Kimley-Horn were compared to the SEIR estimated sound level increases. The traffic sound levels in <br />the SEIR were more conservative and, therefore, were utilized in the assessment. <br />To our knowledge, no Ldn data for I-580 and I-680 within Pleasanton is publicly available. As a result, we <br />based the sound levels for I-580 and I-680 on Caltrans 2019 traffic counts, including traffic counts for <br />trucks. It is not clear what long-term effects the COVID-19 pandemic will have on traffic counts on <br />highways such as I-580 and I-680. The model assumes that traffic counts will return to, but not exceed, <br />2019 traffic counts. The data provided by Caltrans includes peak monthly Average Daily Traffic (ADT) and <br />peak hourly ADT. The data does not include daytime and nighttime traffic counts. To calculate the Ldn <br />for each highway, it was assumed 80% of the peak hourly traffic to represent daytime traffic and 80% of
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