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Soil Investigations for Data Collection in the Delta Initial Study/Proposed Mitigated Negative Declaration 160 e. For a project located within an airport land use plan or, where such a plan has not been adopted, within two miles of a public airport or public use airport, would the project result in a safety hazard or excessive noise for people residing or working in the project area? Less Than Significant Impact. The Study Area is within two miles of the Byron Airport. The Byron Airport is a public-use airport located approximately one-half mile west of the nearest Impact Area. The Proposed Project’s temporary features are largely below the ground surface and would not pose a safety hazard to airport use. The Contra Costa County Airport Land Use Compatibility Plan (Schutt Moen Associates 2000) describes all Byron Airport compatibility polices that will be adhered to, to ensure safety hazards are addressed within the plan area. In addition, the Proposed Project would not involve any aircraft or helicopter uses for soil investigation activities or operations. Proposed Project activities are expected to create minor noise of brief duration from the operation of vehicles and drill rigs associated with Proposed Project activities, that will combine with ongoing regional activities, such as traffic along State Route 4 and Byron Highway, possible rail operations of the Union Pacific Mococo line, existing air traffic from the Byron Airport, and distant industrial operations. The maximum noise from truck-mounted drill rigs and CPT rigs is 120 dba at the rig. The maximum noise from seismic geophysical surveys is 70 dba at 7 meters. While equipment is working, ambient noise levels will increase slightly. Existing activities in the area currently generate the same or more noise than would be expected from the activities of the Proposed Project. While there would be a less than significant impact, implementation of Mitigation Measures MM NOI-1, AES-2, and MM PUB 1 would further avoid, minimize and/or reduce the potential for impacts. f. Impair implementation of or physically interfere with an adopted emergency response plan or emergency evacuation plan? Less Than Significant Impact. During the Proposed Project period, emergency response routes and plans would not be impacted by Proposed Project activities at the Impact Areas. Proposed Project activities conducted would be of limited size and duration. While there would be a less than significant impact on the implementation of or physically interfering with an adopted emergency response plan or evacuation plan, implementation of Mitigation Measure MM PUB-1 would further avoid, minimize and/or reduce the potential for impacts. g. Expose people or structures, either directly or indirectly, to a significant risk of loss, injury, or death involving wildland fires? Less Than Significant Impact. The California Department of Forestry and Fire Protection (CalFire) has created a severity system to rank fire hazards and examine wildland fire potential across the state. These zones found on CalFire maps account for the speed and intensity of potential fire, ability of embers to spread and multiply,