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· Typical noise insulation provided by common types of building construction The Shoreway Road Site is located within a 60-65 CNEL noise contour.15 Safety Certain types of land uses are recognized by the ALUC as hazards to air navigation in the vicinity of the San Carlos Airport. These land uses include the following: · Any use that would direct a steady or flashing light of white, red, green, or amber color toward an aircraft, other than an FAA-approved navigational signal light. · Any use that would cause sunlight to be reflected toward an aircraft following takeoff or approaching landing. · Any use that would generate smoke or rising columns of air. · Any use that would attract large concentrations of birds within approach-climbout areas. · Any use that would generate electrical interference that may interfere with aircraft communications or instrumentation. The Shoreway Road Site is located adjacent to an approach zone where structures generally are not permitted. Height Incompatible land uses are those that would penetrate any of the FAA Part 77 imaginary surfaces for the San Carlos Airport.16 The majority of the Shoreway Road Site appears to be within the 7: 1 Transition slope, one of the airport's imaginary surfaces. Heights are restricted within this area proportionally as a distance from the airport. A thorough review of FAA requirements and height restrictions would be required were this site selected for the replacement jail. According the CLUP, San Carlos has adopted a 50-foot height limit for structures in the airport vicinity. The maximum height limit can be increased via City Council approval of a rezoning that includes a height increase. Advantages and Disadvantages of Site Based on Sheriff's Jail Siting Criteria As indicated by the Sheriff's Office, the Shoreway Road Site offers the following advantages: · Predominately industrial area · The property is large enough to accommodate more than one jail option and allow for potential expansion · Directly adjacent to freeway ramp 15 CNEL refers to Community Noise Equivalent Level, which is a weighted scale used to establish noise standards generally in urban environments. The scale is weighted to apply a decibel penalty to noise that occurs during evening and night-time hours. 16 The imaginary surfaces are roughly saddle-shaped areas projected into the airspace immediately surrounding airport reflective of the ascent and descent approaches of aircraft using the airport. 42 Site I nformation for Alternative Locations for the Proposed Replacement Jail September 2, 2009