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Administrative Draft Environmental Impact Report <br /> Gill Medical Center Project <br /> Table 4.15-13.Modeled Operational Noise Levels-Exempt Noise <br /> Existing Baseline Modeled Operational <br /> Site Location Noise Measurements Noise Attributable to <br /> Location (Leq dBA) Helicopter Landing <br /> (Leq dBA) <br /> 1 Northeast of Project site on Ham Lane N/A 86.2 <br /> 2 Residential property northeast of Project site N/A 90.5 <br /> 3 Residential property northeast of Project site N/A 89.9 <br /> 4 Residential property east of Project site N/A 91.3 <br /> 5 Infront of residence on Ham Lane north of Project site N/A 86.2 <br /> 6 Residential property south of Project site N/A 88.4 <br /> 7 Residential property south of Project site N/A 90.5 <br /> 8 Residential property south of Project site N/A 91.8 <br /> 9 Adjacent to Eight Mile Road and proposed driveway 75.2 86.5 <br /> 10 Residential property south of Project site N/A 82.3 <br /> 11 Residential property south of Project site N/A 79.8 <br /> 12 Residential property south of Project site N/A 77.0 <br /> Source: Stationary source noise levels were modeled by ECORP using SoundPLAN 3D noise model.Refer to Draft EIR Appendix H for <br /> noise modeling assumptions and results. <br /> Notes: Previous noise measurements taken by ECORP Consulting,Inc.,using a Larson Davis SoundExpert LxT precision sound level <br /> meter,of a single helicopter taking off generates a noise level of 87.0 dBA Lmax at 330 feet distant and 87.9 dBA Lmax while <br /> landing,with each event lasting less than five minutes in duration. <br /> Because Project generated sirens and helicopter noise are associated with medical emergencies, they are <br /> exempt from noise standards and the Project would result in a less-than-significant impact associated <br /> with onsite exempt noise sources. <br /> Mitigation Measures <br /> No mitigation required. <br /> Impact 4.15-2: The proposed project would generate groundborne vibrations and groundborne <br /> noise during construction. <br /> Impact Determination: less than significant <br /> Threshold: Exposure of persons to or generation of excessive groundborne vibration or groundborne <br /> noise levels. <br /> Noise 4.15-32 October 2021 <br />