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Ramboll - Stoneridge Mall Residential Project 158850326.2 2/11 Confidential 1. Introduction The Stoneridge Mall Residential Project (Project) would consist of 360 multi-family units in a four- and five-story building with an attached parking structure on a 6-acre site. The site is currently a parking lot that services the existing Stoneridge Mall. Ramboll understands that the Project must comply with the Mitigation Measures (MM) in the City’s 2012 Housing Element Supplemental Environmental Impact Report (SEIR). This report details the study conducted to assess the Project’s adherence to select noise-related mitigation measures (specifically MM 4.J-2, MM4.J-5c, and MM 4.J-6a) from the SEIR certified by the City of Pleasanton in connection with its 2012 Housing Element and Climate Action Plan. The 2022 Stoneridge Residential Project site is one of the rezoning sites for which the impacts of residential development were studied in that SEIR. 2. Assessment of Project’s Potential Construction Vibration Impacts on Neighboring Sensitive Uses (MM 4.J-2) Pursuant to the referenced SEIR, specifically the prescribed Mitigation Monitoring and Reporting Program, the following is a condition of approval for the subject project. MM 4.J-2 – The City shall require developers on the potential sites for rezoning to conduct a vibration study which will estimate vibration levels at neighboring sensitive uses, and if required, provide mitigation efforts needed to satisfy the applicable construction vibration level limit established in Table 4.J-4. It is expected that vibration mitigation for all project sites will be reasonable and feasible. The construction vibration assessment estimated potential vibration levels at neighboring sensitive uses (i.e., residences) due to expected construction activities associated with the development of the Project. The assessment is based on typical vibration levels for construction equipment and activities as provided by the Federal Transit Administration (FTA). Estimated construction-related vibration levels were evaluated against criteria outlined in the referenced SEIR. Project-related construction vibration was evaluated using methods identified in the FTA guidance document. Ground-borne vibration generated by construction equipment is commonly evaluated by the maximum rate or velocity of particle movement, referred to as the peak particle velocity (PPV), typically measured in inches per second (in/sec). Except for pile-driving activities and blasting, most construction activities typically range from between approximately 0.003 PPV and 0.21 PPV, when measured at 25 feet from the source. Vibration levels for typical construction equipment are shown in Table 1.