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ARROYO LAGO RESIDENTIAL PROJECT ADDENDUM 152 FCS Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480036/Addendum/21480036 Arroyo Lago Residential Project Addendum.docx A. No individual piece of equipment shall produce a noise level exceeding 83 dBA at a distance of 25 feet. If the device is housed within a structure on the property, the measurement shall be made outside the structure at a distance as close to 25 feet from the equipment as possible; or B. The noise level at any point outside of the property plane of the project shall not exceed 86 dBA. However, the Prior FEIR utilized the FTA thresholds for evaluating construction noise impacts. Therefore, the FTA thresholds used in the Prior FEIR remain appropriate for evaluating construction noise impacts for the proposed project, and the City has determined, in its discretion, to utilize both the City’s standards and the FTA threshold here; thus, the analysis remains consistent with the methodology used in the Prior FEIR. For residential uses, which are the only noise-sensitive land use types within 1,000 feet of the proposed project, the FTA’s criteria are an 80 dBA Leq(8-hr) daytime limit, a 70 dBA Leq(8-hr) nighttime limit, and a 75 dBA Ldn 30-day average. The closest sensitive receptor is located approximately 35 feet from the acoustical center of construction activity. Because construction would not occur during nighttime hours pursuant to implementation of MM NOI-1, the analysis in the Prior FEIR focused on the 80 dBA Leq(8-hr) daytime limit to evaluate the significance of the proposed project’s construction- related noise impacts at nearby residential uses. The City’s construction noise standards are outlined in Section 9.04.100 of the Municipal Code, which identifies that construction noise is exempt from the noise performance standards of the Noise Ordinance between the hours of 8:00 a.m. and 8:00 p.m. daily, except Sunday and holidays, when the exemption shall apply between 10:00 a.m. and 6:00 p.m., provided the construction activity meets at least one of the following noise limitations: A. No individual piece of equipment shall produce a noise level exceeding 83 dBA at a distance of 25 feet. If the device is housed within a structure on the property, the measurement shall be made outside the structure at a distance as close to 25 feet from the equipment as possible; or B. The noise level at any point outside of the property plane of the project shall not exceed 86 dBA. Construction activities under the proposed project would be similar to those under the County Project, albeit reduced in intensity to a certain degree due to the reduced project footprint. Construction noise impacts were found to be intermittent and variable under the Prior FEIR, reaching a maximum 8-hour average of 78 dBA Leq(8-hr). Given the substantial similarities between the proposed project and the County Project, it is reasonable to conclude that the proposed project would result in substantially the same levels of noise, if not slightly reduced. As such, estimated maximum construction noise levels would not exceed the City’s construction noise standard of 86 dBA Leq as measured at the property plane. Additionally, MM NOI-1 would still be implemented to ensure adherence to the permissible construction hours and to ensure implementation of best management noise reduction techniques