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Administrative Draft Environmental Impact Report Gill Medical Center Project Table 4.15-3.Existing(Baseline)Noise Measurements Location Location Le dBA Lm,n Lmax Time Number q dBA dBA Short-Term Noise Measurements(September 9,2020) 1 Adjacent to West Lane between homes(located on 65.1 38.5 77.9 10:20 a.m-10:35 a.m. Mettler Road)and The Home Church 2 On West Eight Mile Road adjacent to mailbox 2001 75.2 40.4 100.9 9:20 a.m.-9:35 a.m. 3 On North Ham Road adjacent to house 11013 62.0 36.5 82.6 9:39 a.m-9:54 a.m. 4 On North Ham road adjacent to house 11243 64.3 36.9 82.8 9:57 a.m.-10:12 a.m. 5 In the residential community off Olive Grove Drive 44.5 34.9 61.8 10:44 a.m-10:59 a.m. adjacent to house 199 Long-Term Noise Measurements(September 9,2020-September 10,2020) Location Location CNEL Leq Lmin Lmax Time Number dBA dBA dBA dBA 6 Adjacent to the agricultural canal and West Lane 67.7 63.8 37.0 90.7 11:32 a.m.-11:32 a.m. adjacent to the northern end of the Project site. Source: Measurements were taken by ECORP with a Larson Davis SoundExpert LxT precision sound level meter,which satisfies the American National Standards Institute for general environmental noise measurement instrumentation.Prior to the measurements, the SoundExpert LxT sound level meter was calibrated according to manufacturer specifications with a Larson Davis CAL200 Class I Calibrator.See Draft EIR Appendix H for noise measurement outputs. 4.15.2.4 Existing Roadway Noise Levels Existing roadway noise levels were calculated for the roadway segments in the Project vicinity.This task was accomplished using the FHWA Highway Traffic Noise Prediction Model (FHWA-RD-77-108) (see Draft EIR Appendix H) and traffic volumes from the Project's Traffic Impact Study (KD Anderson &Associates 2020).The model calculates the average noise level at specific locations based on traffic volumes, average speeds, roadway geometry, and site environmental conditions.The average vehicle noise rates (energy rates) used in the FHWA model have been modified to reflect average vehicle noise rates identified for California by Caltrans.The Caltrans data shows that California automobile noise is 0.8 to 1.0 dBA higher than national levels and that medium and heavy truck noise is 0.3 to 3.0 dBA lower than national levels. The average daily noise levels along these roadway segments are presented in Table 4.15-4.Vicinity roadways span two jurisdictions, which are noted in Table 4.15-4. Where no jurisdiction is noted, the roadway segment lies within unincorporated San Joaquin County. Noise 4.15-9 October 2021