Noise or Annoyance? Is actual jet noise a problem? Or is the problem only present in complaints?

Approaches as portrayed by critics… Actually photographed at the edge of Mather Airport, A F at ~ 150 feet above ground

Sanity Checks: How does our situation compare with somewhat similar ones elsewhere? Objective factors Subjective factors

Locations of publicly vocal complainers

Homeowners reporting no jet noise problem From personal contact while measuring actual noise levels 3 of 3 homeowners contacted at point of Maximum noise in El Dorado Hills 2 of 2

Interwoven Issues What sound levels do freighter approaches actually produce on the ground? How much traffic (approaches per day over EDH/Folsom) is there? When? How will these measures change in the future? How do complaints about noise relate to actual noise? What misconceptions are evident in complaints? How do public agencies affect public perception?

Mather ILS vertical profile

CAMRR 6,500 LDORR 5,000 YOSHE 3,000 Nominal ILS Approach

EDH West Ridge 3,900 EDH East Ridge 4,600 Nominal ILS Approach

ILS LDORR Plus a burst of afternoon traffic

VFR approach South of US 50

Loudest 2008 freighter approach recorded in WebTrak: Probably about 85 dBA

Approach from south By UPS954 plus other Traffic (week before Christmas)

Approach Usage Data for the week of December 15 through December 22, The week before Christmas, busiest freight week of the year

Approach Noise Exposure Potential Data for the week of December 15 through December 22, The week before Christmas, busiest freight week of the year

Overflight Noise Measurement Measurements on SierraFoot.org use Lmax, the maximum noise level SEL/SENEL – Oakland, Foster City Lmax, Oakland, Foster City SEL/SENEL, EDH West Ridge Lmax, EDH West Ridge

Actual Crossing Altitudes on ILS at Initial Approach Fix Rescue area, north of Shingle Springs

Actual Crossing Altitudes on ILS at El Dorado Hills west ridge

Measured Noise

Approaches per day and Noise-Number Index for Annoyance

NNI Annoyance & Complaint Rate EDH CSDEDH West RidgeFoster City NNI – Noise/Number Index Complaints per 1,000 approaches 1, NNI is the first widely accepted index of annoyance due to exposure to jet noise, adopted by the British more than 40 years ago. Published literature, including documents cited by indicate that NNI less than 35www.keepthepeace.org corresponds to insufficient annoyance to produce complaints. Values somewhat above, such as Foster City‘s 46.2, are expected to produce sporadic complaints. This table reports a composite complaint rate for Mather-correlated complaints from Folsom, El Dorado Hills, Rescue, and Shingle Springs. All complaint counts are from the first 7 months of 2008.

Can a single serial complainer dominate complaint statistics? Yes -- Here’s an example from LAX, July 2008:

Serial Complainers & MHR Noise complaint statistics correlated with Mather flights also show highly disparate rates depending on the location of complainers. Average monthly complaints : 45 per Folsom caller, 12 per EDH caller

Serial Complainers & SMF Location-specific complaints also apply to noise attributed to flights to and from Sacramento International Airport. Average monthly complaints: 33 per Folsom caller, 8 per EDH caller

MHR serial complaints by community Complaint percentage distribution for SMF is similar, ± 6% per community

SMF serial complaints by community Complaint percentage distribution for MHR is similar, ± 6% per community

Populace in general Most people in the EDH/Folsom area think we have problems with jets flying too low and too loud. The main exceptions are those who live directly under the ILS approach, who generally indicate no problem exists. The public understanding derives mainly from public dialog and media news coverage. Public agency treatment of the issue as a noise problem has carried strong influence – especially in connection with the City of Folsom‘s law 2007 law suit.

Public discourse and public policy determine public perception. If public agencies treat something as a problem the public perceives it as a problem.