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residential project, and residential projects are not considered significant stationary noise sources, as are industrial facilities and specific service commercial uses such as automotive repair facilities, salvage yards, and car washes, among others (San Joaquin County 2016a). Project impacts related to noise increases would be less than significant with implementation of mitigation for construction noise. Level of Significance: Potentially significant Mitigation Measures: NOISE-1: Project contractors shall use newer equipment with improved muffling and ensure that all equipment items have intact and operational the manufacturers' recommended noise abatement measures, such as mufflers, engine enclosures, and engine vibration isolators. All construction equipment shall be inspected at periodic intervals to ensure proper maintenance and presence of noise control devices (e.g., mufflers, shrouding, etc.). In accordance with the California Air Resources Board's Regulation for In-Use Off-Road Diesel-Fueled Fleets, idling of construction equipment for more than five minutes shall be prohibited unless an activity is specifically exempted by the Regulation. Significance After Miti ag tion: Less than significant b) Groundborne Vibration. Groundborne vibration is not a common environmental problem. Some common sources are trains, buses on rough roads, and construction activities such as blasting, pile driving, and operating heavy earth-moving equipment. Construction vibration impacts include human annoyance and building structural damage. However, construction impacts on the project site would be temporary and short-term. The main source of vibrations is anticipated to be grading equipment, which would no longer be used once the grading portion of construction work is completed. The project would not generate groundborne vibrations once work is completed. Project impacts related to groundborne vibrations would be less than significant. c) Exposure to Airport/Airstrip Noise. As noted in Section 3.9, Hazards and Hazardous Materials, Stockton Metropolitan Airport is approximately 2.25 miles south of the project site. Noise contours for the airport were developed based on the Community Noise Equivalent Level (CNEL), which is the same as the Lan but with an additional +5-dB weighting applied to noise occurring between 7:00 p.m. and 10:00 p.m. Based on the noise contour maps related to the Stockton Metropolitan Airport, the projected 60 dBA CNEL contour extends no more than 1.52 miles to the northwest of the airport facility and the 65 dBA CNEL contour extends approximately 0.79 miles from the airport (both distances are with respect to the end of the runway). Thus, noise from Stockton Metropolitan Airport operations would not lead to ambient noise at the project site exceeding County noise standards. The project site is beyond both noise contours. There are no private airstrips in the vicinity. Pock Lane Public Review Draft IS/MND 3-55 May 2022