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Administrative Draft Environmental Impact Report Gill Medical Center Project Table 4.15-12.Modeled Operational Noise Levels-Non-Exempt Noise Existing Modeled County Exceed Operational Exterior Site Baseline Noise Standard? Location Location Measurements Noise Standards (Day (Leq dBA) Attributable to (dBA) /Night) Project(Leq dBA) (Day/Night) 12 Residential property south of Project site N/A 39.4 50/45 No/No Source:Stationary source noise levels were modeled by ECORP using SoundPLAN 3D noise model.Refer to Draft EIR Appendix H for noise modeling assumptions and results. Notes:Previous noise measurements taken by ECORP Consulting,Inc.,using a Larson Davis SoundExpert LxT precision sound level meter, within a visitors parking lot adjacent to a 298 bed medical center,emergency care,and Level II trauma center equip with FlightCare air ambulance service recorded a noise level of 53.8 dBA. As shown in Table 4.15-12, Project onsite noise levels would reach between 31.4 and 42.0 dBA at the nearby noise-sensitive residences during Project operations. These numbers fall below the County's daytime (7:00 a.m. to 10:00 p.m.) and nighttime (10:00 p.m. to 7:00 a.m.) noise standards for residential land uses.Additionally, as previously stated the manner in which older homes in California were constructed generally provides a reduction of exterior-to-interior noise levels of about 20 to 25 dBA with closed windows (Caltrans 2002). This exterior-to-interior noise reduction would reduce the depicted noise levels further, as they are experienced within the vicinity residences. Furthermore, it is noted that Location 9 currently experiences noise levels of 75.2 dBA and the modeled operational noise level attributed to Project onsite non-exempt activities is 36.3 dBA.Thus, the noise environment in the Project area currently exceeds that which would be produced by the Project. It is noted that Sound PLAN was used to calculate non-exempt operational noise from a worst-case scenario.All non-exempt noise producing sources on the Project site were calculated as if operating at the same time and at the highest activity level to produce noise levels as high as those predicted. Further, the soft surfaces and vegetative screening innate to the strip of proposed landscaping that would surround the site, which can absorb sound, was not accounted for in the Sound PLAN model. The Project would result in a less than significant impact from non-exempt onsite noise. Exempt Onsite Stationary Noise The Project is proposing the construction of an OSHPD Hospital, a full-service women's ABC facility, and a OSHPD 1 hospital, associated medical office building and associated features. Due to the nature of this Project, it would be a source of noise due to emergency activities such as sirens from emergency vehicles along with helicopter landing and takeoff during operations.As previously mentioned, per Section 9- 1025.9 of the San Joaquin County Municipal Code, this noise is exempt from noise standards as it is associated with medical emergencies. Nonetheless, a full discussion of medical emergency-related noise sources has been included for full disclosure purposes.The emergency noise sources are discussed individually below. Noise 4.15-27 October 2021