14 ATTACHMENT 6 - Appendix A - E

City of Pleasanton–Spotorno Ranch Reduced Development Project Environmental Checklist Initial Study/Consistency Checklist 136 FirstCarbon Solutions https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480021/Consistency Checklist/21480021 Spotorno Ranch Consistency Checklist ScreenCheck.docx As shown in Table 3 the highest traffic noise level increase would occur along Happy Valley Road west of Alisal Street, under Existing Plus Project conditions. Along this roadway segment, an increase of 1.6 dBA under would occur under Plus Project conditions, compared to conditions that would exist without the proposed project. This is not greater than a 3 dBA increase that would be considered a substantial increase. The 1998 HVSP FEIR found that noise along roadways would not be a significant impact. Therefore, project-related traffic noise impacts of the proposed 22-unit project would be no different, and the conclusions of the 1998 HVSP FEIR remain the same. b) Groundborne Vibration Would the project result in: Generation of excessive groundborne vibration or groundborne noise levels? Short-term Construction Vibration Impacts to Off-site Receptors The 1998 HVSP FEIR did not address the question of groundborne vibration. Of the variety of equipment used during construction, vibratory rollers that would be used in the site preparation phase of construction would produce the greatest groundborne vibration levels. Impact equipment such as pile drivers is not expected to be used during construction of the proposed project. Large vibratory rollers produce groundborne vibration levels ranging up to 0.210 inch per second (in/sec) peak particle velocity (PPV) at 25 feet from the operating equipment. The nearest off-site receptor is a residential home located approximately 90 feet from the construction footprint of proposed structures where heavy equipment would be operating. At this distance, operation of the large vibratory rollers could result in groundborne vibration levels up to 0.03 PPV. This is well below the Federal Transit Administration (FTA ) damage threshold criteria of 0.12 PPV for even the most fragile structures. Therefore, the impact of short-term groundborne vibration associated with construction to off-site receptors would be less than significant, and the proposed project would not result in any peculiar effects and would not result in new or more severe impacts related to groundborne construction vibration beyond what was previously analyzed in the 1998 HVSP FEIR. Operational Vibration Impacts 1998 Happy Valley Specific Plan Implementation of the proposed project would not include any permanent sources of vibration 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 vicinity of the project site. In addition, there are no existing significant permanent sources of groundborne vibration in the vicinity of the site to which the proposed project would be exposed. The project site is located more than 4,000 feet from the closest lane on I-680. This distance is sufficient to attenuate any vibration from transportation sources to levels that would not be perceptible without instruments within the site. Therefore, project operational groundborne vibration level impacts would be considered less than significant. Therefore, the proposed project would not result in any peculiar effects and would not result in new or more severe impacts related to operational vibration beyond what was previously analyzed in the 1998 HVSP FEIR.