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• Constructing a noise screening structure such as a wall; and • Limiting hours of operation of the drive-through component of the proposal. Staff notes the proposed restaurant is unlikely to generate any significant noise impacts or result in a substantial change in ambient noise levels on sensitive receptors in the area given the existing noise levels generated by the surrounding commercial uses and vehicles traveling on Santa Rita Road, as well as the location of the drive-through queueing lane and ordering speaker and their distances from the closest sensitive receptors (approximately 490 feet from the existing residential uses to the east). Additionally, the drive-through queueing lane and ordering speaker are oriented facing away from the residential uses, generally along the western side of "Pad B" and behind the western side of the proposed restaurant to further reduce any noise impacts. A typical drive-through audio system generates approximately 75 decibels (dBa2) from a distance of 3 feet, 64 dBa from a distance of 20 feet, and 53 dBa generated from a distance of 70 feet. If supported, the proposed restaurant would be required to meet the maximum noise limit in the PMC of 70 dBa at the property plane. For informational purposes, the General Plan prescribes the following noise thresholds: • For residential uses, up to 60 Ldn3 is normally acceptable, while 60 to 75 Ldn is conditionally acceptable; and • For commercial uses, up to 70 Ldn is normally acceptable, while 70 to 80 Ldn is conditionally acceptable. The General Plan further indicates the closest residential uses to the east of "Pad B" currently experience 65 dBa Ldn given their adjacency to Santa Rita Road. Architectural Design "Pad B" is highly visible from Rosewood Drive. Accordingly, in discussing a potential design, staff directed the applicant to ensure the proposed restaurant would be reflective of the design character and quality typically seen in Pleasanton. Staff suggested the project incorporate traditional architectural elements into the overall design and to ensure the same level of detail is replicated on all four sides of the proposed restaurant. In addition, staff indicated franchise and/or prototype architecture would not be supported. As a reference, staff encouraged the applicant to consider modeling their design based on the new and recently implemented architectural styles/materials for Phases I and II of the Rose Pavilion Shopping Center across Rosewood Drive, particularly ensuring it would be compatible with the upgraded building design. Should the Planning Commission and City Council support the requested PUD Modification to allow for the proposed restaurant with a drive-through component, staff has suggested several modifications would be needed to the building design, including: • The east elevation should be redesigned to include windows/storefront facing Rosewood Drive. While this elevation represents the "back of house" for the proposed restaurant, additional consideration should be shown to provide high quality design for this prominent elevation that would be highly visible. 2 A-weighted decibels are an expression of the relative loudness of sounds in air as perceived by the human ear. 3 The day-night average sound level is the average noise level over a 24-hour period. PUD-89-06-08M, 4210 Rosewood Drive Planning Commission 13 of 15 sign revisions and/or conditions of approval. Some potential examples include: • The ordering speaker shall not be audible above the ambient noise levels beyond the property boundaries; and PUD-89-06-08M, 4210 Rosewood Drive Planning Commission 12 of 15 2 of 15