14 ATTACHMENT 6 - Appendix A - E

City of Pleasanton–Spotorno Ranch Reduced Development Project Initial Study/Consistency Checklist Environmental Checklist FirstCarbon Solutions 133 https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480021/Consistency Checklist/21480021 Spotorno Ranch Consistency Checklist ScreenCheck.docx types of construction equipment may involve 1 or 2 minutes of full power operation followed by 3 or 4 minutes at lower power settings. Operating cycles for these types of construction equipment may involve 1 or 2 minutes of full power operation followed by 3 or 4 minutes at lower power settings. Construction of the proposed project is expected to require the use of scrapers, bulldozers, water trucks, haul trucks, and pickup trucks. Based on construction equipment reference noise levels, the maximum noise level generated by a scraper is assumed to be 85 dBA maximum noise/sound level (Lmax) at 50 feet from this equipment. Each bulldozer would also generate 85 dBA Lmax at 50 feet. The maximum noise level generated by graders is approximately 85 dBA Lmax at 50 feet. A characteristic of sound is that each doubling of sound sources with equal strength increases a sound level by 3 dBA. Assuming that each piece of construction equipment operates at some distance from the other equipment, a reasonable worst-case combined noise level during this phase of construction would be 90 dBA Lmax at a distance of 50 feet from the acoustic center of a construction area. This would result in a reasonable worst-case hourly average of 86 dBA Leq(h), at a distance of 50 feet from the acoustic center of a construction area when multiple pieces of heavy equipment operate simultaneously in relatively the same location for an hour period. The acoustic center reference is used because construction equipment must operate at some distance from one another on a project site, and the combined noise level as measured at a point equidistant from the sources (acoustic center) would be the worst-case maximum noise level. The effect on sensitive receptors is evaluated below. The project site is bordered by single-family residential land uses to the north, northwest, west, and southwest; a golf course, undeveloped land and Westbridge Lane to the south; and open space to the east. The nearest off-site residential receptor is located adjacent to the project site’s northwestern corner and is over 90 feet from the acoustic center of construction activity where multiple pieces of heavy machinery would operate. At this distance, intermittent maximum construction noise levels at the nearest receptor outside of the project property plan could range up to 85 dBA Lmax, with resulting reasonable worst-case hourly average noise levels of 81 dBA Leq. These noise levels could occur temporarily under the reasonable worst-case scenario of multiple pieces of heavy construction equipment operating simultaneously in relatively the same locations near the project boundary for an hour period. These noise levels would drop off at a rate of 6 dBA per doubling of distance as the equipment moves over the site and operates at greater distances from off-site receptors. These reasonable worst-case construction noise levels would not exceed the City’s standards of 86 dBA Leq at any receptor outside of the property plane of the project. Although there could be a relatively high single-event noise exposure potential causing an intermittent noise nuisance, the effect on longer-term (hourly or daily) ambient noise levels would be small but could result in annoyance or sleep disturbances at nearby sensitive receptors. As noted in above, construction hours are governed by MM C.4 of the 1998 HVSP FEIR, which restricts construction hours to 8:00 a.m. and 5:00 p.m. Monday through Saturday. Restricting construction activities to these stated time-periods would ensure that construction noise would not result in a substantial temporary increase in noise levels in excess of established standards that could result in annoyance or sleep disturbances at nearby sensitive receptors. Therefore, with implementation of MM C.4 of the 1998 HVSP FEIR, the proposed project would not result in any peculiar effects and would not result in new or