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Administrative Draft Environmental Impact Report Gill Medical Center Project 4.15.4.3 Project Impacts and Mitigation Measures Impact 4.15-1: The proposed project could generate noise in excess of standards or result in a substantial increase in ambient noise levels. Impact Determination: Less than significant Thresholds: Exposure of persons to or generation of noise levels in excess of standards established in the local general plan or noise ordinance, or applicable standards of other agencies. Substantial increase in ambient noise levels in the project vicinity above levels existing without the project. As previously described, noise-sensitive land uses are locations where people reside or where the presence of unwanted sound could adversely affect the use of the land. Residences, schools, hospitals, guest lodging, libraries, and some passive recreation areas would each be considered noise-sensitive and may warrant unique measures for protection from intruding noise.The existing nearest noise-sensitive land use to the Project site are residences located directly adjacent to the proposed solid seven-foot-tall CMU along the southern site boundary and proposed driveway access from Eight Mile Road, and a single Ham Lane residence located adjacent the site's eastern boundary. Project Construction Noise Construction noise associated with the Proposed Project would be temporary and would vary depending on the nature of the activities being performed. Noise generated would primarily be associated with the operation of off-road equipment for onsite construction activities as well as construction vehicle traffic on area roadways. Construction noise typically occurs intermittently and varies depending on the nature or phase of construction (e.g., land clearing, grading, excavation, paving). Noise generated by construction equipment, including earth movers, material handlers, and portable generators, can reach high levels. Typical operating cycles for these types of construction equipment may involve one or two minutes of full power operation followed by three to four minutes at lower power settings. Other primary sources of acoustical disturbance would be random incidents, which would last less than one minute (such as dropping large pieces of equipment or the hydraulic movement of machinery lifts). During construction, exterior noise levels could negatively affect sensitive land uses in the vicinity of the construction site Nearby noise-sensitive land uses consist of rural residences located adjacent to the southern and eastern Project site boundary.As previously described, Section 9-1025.9 of the County's Municipal Code exempts noise sources associated with construction, provided such activities do not take place before 6:00 a.m. or after 9:00 p.m. on any day.The County does not promulgate a numeric threshold pertaining to the noise associated with construction.This is due to the fact that construction noise is temporary, short term, intermittent in nature, and would cease on completion of the Project. Additionally, construction would occur throughout the Project site and would not be concentrated at one point. To estimate the worst-case onsite construction noise levels that may occur at the nearest noise-sensitive receptors in the Project vicinity, the construction equipment noise levels were calculated using the Roadway Noise Construction Model for the various construction phases for each roadway segment and compared against the construction-related noise level threshold established in the Criteria for a Noise 4.15-19 October 2021