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and other vehicles at the Union Pacific Intermodal Facility with Ambient-Sensitive Self-Adjusting Backup Alarms,which automatically increase or decrease their volume based upon background noise levels to ensure that the tone produced is no louder than necessary. The applicant will also be required to test the safety implications of replacing single-tone backup alarms with less intrusive broadband noise types and determine if such replacement is feasible without compromising yard safety. The applicant will be required to implement Mitigation Measures NOISE-1a, NOISE-Ib, NOISE-Ic, and NOISE-ld as a condition of project approval, and if all of the devices described in such mitigation measures are utilized, noise impacts from project operations will be less than significant. However, electric hybrid cranes and/or broadband noise alarms may not be feasible. The applicant, Union Pacific, has advised the County that it maintains the largest intermodal network in North America, including 34 intermodal terminals within the United States and more than 100,000 containers riding on 32,000 miles of track. Union Pacific has informed the County that it has not had sufficient experience utilizing electric hybrid cranes or broadband noise alarms in an intermodal yard environmental to determine whether such devices are operationally feasible or whether such devices would compromise intermodal yard safety. Hence, while Union Pacific is obligated to test the feasibility of these devices in yard conditions under Mitigation Measures NOISE-lc and NOISE- ld,respectively,it cannot be assured that such devices will be feasible after testing,and the impact is therefore significant and unavoidable. November 2012 29 Findings of Fact/ Statement of Overriding Considerations