Airport Noise Management System Chicago O Hare International Airport

July 217 Monthly Report Airport Noise Management System Chicago O Hare International Airport Visit the O Hare Noise webpage on the Internet at www.flychicago.com/ordnoise

Airport Noise Management System Monthly Report Report Descriptions Background Installed in 1996, the Airport Noise Management System (ANMS) enables the City of Chicago to monitor the amount of noise being generated over the communities surrounding O Hare International Airport (O Hare) by the aircraft operating at the Airport. The ANMS collects, analyzes and processes data from a number of sources of information including a network of 33 noise monitors around O Hare, FAA radar data, weather data and noise complaints. Over 15, flights and 4, noise events are recorded by the ANMS each month for the Chicago Department of Aviation (CDA). The City of Chicago and the O Hare Noise Compatibility Commission utilize data from the ANMS to facilitate the development and management of noise abatement programs at the Airport. The following reports summarize pertinent monthly information from that data concerning the noise levels and operations at the Airport. Wind Summary Wind is a key factor influencing runway use and operation. Aircraft performance requirements make it necessary for aircraft to take off and land into the wind for safety purposes. Ideally, aircraft should take off and land into the wind as the increased airflow over the wings provides improved lift. The diagram to the right summarizes the percent of wind occurrences by direction based on hourly data from the KORD Automated Surface Observing System (ASOS), which is a joint effort of multiple government agencies. Aircraft Operations Summary The chart below illustrates the trend in monthly aircraft operations at O Hare. Total monthly operations are based on the FAA s Air Traffic Activity Data System (ATADS). Aircraft Operations by Month Month 28 29 21 211 212 213 214 215 216 217 January 72,493 66,45 67,535 7,584 67,893 67,794 59,692 66,597 66,998 66,22 February 65,445 62,259 62,52 6,169 65,58 61,268 61,59 6,242 62,856 6,362 March 75,222 7,435 73,387 76,711 73,4 72,436 73,546 74,17 72,954 7,656 April 74,896 68,57 73,229 72,82 73,492 71,14 73,657 72,927 72,291 69,9 May 77,897 7,195 75,615 74,318 74,947 77,367 76,343 76,329 75,12 73,928 June 76,183 69,8 74,821 76,369 77,262 76,668 77,641 76,26 76,98 75,553 July 8,483 72,98 79,446 79,273 78,481 81,186 83,17 79,679 76,635 77,851 August 78,281 73,81 8,17 79,518 79,941 8,884 8,562 78,895 78,269 September 72,915 69,43 75,358 73,877 73,561 74,83 73,884 73,56 73,383 October 75,419 71,755 77,312 75,779 75,932 79,75 78,494 77,47 75,948 November 66,162 66,938 72,72 69,54 7,146 71,488 71,915 7,466 69,958 December 66,17 66,996 7,585 7,344 67,95 69,178 72,123 68,928 66,261 Total 881,566 827,899 882,617 878,798 878,18 883,287 881,933 875,136 867,635 493,381 Chicago Department of Aviation Page 1 July 217

Aircraft Fleet Mix Report The Aircraft Fleet Mix Report summarizes the number and type of aircraft operating at O Hare during both all hours of the day and during the nighttime hours. In 199, Congress passed the Airport Noise and Capacity Act (ANCA) to create a more comprehensive method for regulating aircraft noise. ANCA tasked the FAA with establishing a national noise policy, as well as substituted advances in quiet engine technology for restrictions on airport operations. These aircraft noise standards are codified in FAA Part 36 regulations, Noise Standards: Aircraft Type and Airworthiness Certification. Aircraft must meet Part 36 standards to receive type or airworthiness certificates to operate in the United States. There are four stages of noise standards for aircraft: Stage 1, Stage 2, Stage 3, and Stage 4. Currently, all aircraft operating at O Hare and within the United States are Stage 3 or 4. These aircraft, such as the Airbus A32 and new Boeing 737 s (B737) use a quieter type of engine that significantly reduces noise at the source. Runway Use Report O Hare has eight runways that are all utilized at different times depending primarily upon the prevailing wind conditions on the airfield, as well as any runway maintenance. The Runway Use Report presents the average percentage of use for each runway for the current month, the previous month and a 12-month average. The percentage of use for departures and arrivals is shown graphically for each runway. This data is for daytime hours (7 a.m. to 1 p.m.) and for all aircraft types. Also shown is the runway use for the nighttime hours (1 p.m. to 7 a.m.). Percentage is a ratio whereas a percentage point is the difference between two percentages. Departures Arrivals Most used departure runway: 28R 3% Most used arrival runway: 1C 24% 9R departures increased by 11pp from June 217 1C arrivals increased by 1pp from June 217 28R departures decreased by 13pp from June 217 27L arrivals decreased by 1pp from June 217 pp = Percentage Points Aircraft Noise Report The Aircraft Noise Report summarizes noise measurements from each of the 33 permanent noise monitors located around the Airport. The data presented summarizes the Day-Night Average Sound Levels (DNL s). DNL is a 24-hour time-averaged sound exposure level with a 1 decibel (db) nighttime (1 p.m. to 7 a.m.) weighting to account for the lower background noise levels during the nighttime hours. The dataset for the current month includes 948 monitor-days out of a possible 1,23 monitor-days (93%). The data displays the measured aircraft DNL for each month and its comparison to the same month of the previous year, and it compares the current month to the 12-month average. The aircraft noise report identifies noise from the existing aircraft operations at O Hare. The modeled values for each monitor are shown for 1997, 2 and the OMP Build- Out Noise Contours. The aircraft noise levels for each monitor vary from month to month. This is primarily due to runways being utilized differently under changing wind conditions. The modeled 65 DNL noise contour at O Hare has shrunk in size consistently since 1979 (right) despite an increase in total aircraft operations because of the replacement of Stage 1 and 2 aircraft with Stage 3 and 4 aircraft mandated by ANCA. Chicago Department of Aviation Page 2 July 217

Noise Complaint Report The Chicago Department of Aviation (CDA) maintains a toll-free noise hotline (1-8-435-9569) and an on-line service at www.flychicago.com/ordnoise for citizens to express their concern about particular aircraft events or aircraft noise levels in general. The Noise Complaint Report summarizes the number of complaints received and where the complainants were located. The tabular report lists the number of complaints by community as well as the number of individual complainants. The graphs illustrate the nature of complaints during the specified month. Also shown are complaints by month displaying seasonal trends. The chart below illustrates the trend in monthly complaints. These totals only include complaints made within the State of Illinois to the O'Hare Noise Hotline toll-free number or on-line feature. Complaints by Month Month 28 29 21 211 212 213 214 215 216 217 January 31 86 97 1,349 5,635 1,357 6,321 39,5 359,633 354,185 February 2 1,186 968 1,6 3,236 966 7,472 122,83 343,149 337,94 March 6 1,69 1,222 1,29 2,175 1,42 11,145 352,846 468,691 466,189 April 63 985 1,478 1,99 1,113 1,863 1,961 48,468 459,26 565,697 May 92 1,235 1,168 1,192 1,21 1,881 21,436 47,523 415,778 66,591 June 14 1,131 1,587 1,34 1,332 2,419 22,566 436,119 483,443 483,252 July 138 1,466 1,77 849 1,74 2,28 27,956 382,999 512,849 49,368* August 21 1,649 1,358 2,5 1,47 2,296 3,249 42,716 53,447 September 151 1,883 1,29 3,12 993 2,124 32,532 388,767 434,796 October 123 1,514 1,27 3,292 1,366 3,496 33,866 41,379 43,855 November 271 825 1,234 3,443 877 4,763 3,748 351,873 319,437 December 1,184 1,55 85 4,44 1,16 4,646 32,959 345,168 263,238 Total Calls 2,483 14,858 14,346 24,47 21,497 29,493 268,211 4,58,161 4,967,342 3,33,376 *34% of the complaints in July came from 13 addresses. Chicago Department of Aviation Page 3 July 217

Aircraft Fleet Mix Report Chicago O'Hare International Airport Period: July 217 Regional Aircraft Aircraft Average Average Operations Operations Percent Percent Per Day Per Night of Total of Total (All Hours) (1 p.m. - 7 a.m.) (All Hours) (1 p.m. - 7 a.m.) Percentage of Total Day Night CRJ2/7/9 631 51 25.5% 2.1% E135/E145 35 24 12.3% 1.% E17 256 16 1.4%.6% E19 23 3.%.% C28 16 1.6%.% Subtotal 1,231 95 48.9% 3.7% Narrow-Body Aircraft A319/32/321 355 57 14.4% 2.3% B717 15.6%.% B737 516 77 2.9% 3.1% B757 59 13 2.4%.5% MD8 64 7 2.6%.3% MD9 8 1.3%.% Subtotal 1,17 155 41.1% 6.3% Wide-Body Aircraft A3 4 3.2%.1% A33 15 1.6%.% A34 7 1.3%.% B747 41 14 1.7%.6% B767 31 3 1.3%.1% B777 66 9 2.7%.4% B787 27 4 1.1%.2% DC1 5 3.2%.1% MD11 3 1.1%.% Subtotal 199 39 8.1% 1.6% General Aviation 25 7 1.%.3% Total 2,472 296 1% 12% % 2% 4% Chicago Department of Aviation Page 4 July 217

Runway Use Report Chicago O'Hare International Airport Period: July 217 Time of Day: 7: a.m. to 1: p.m. Runway Use (7 a.m. to 1 p.m.) Source: Airport Noise Management System (ANMS) Runway Utilization 4L 4R 9L 9R 1L 1C 1R 15 22L 22R 27L 27R 28L 28C 28R 33 Average Daily Departures July 217 1 35 275 183 335 8 June 217 2 186 157 279 1 49 8 12 Month Avg. 1 214 18 1 23 1 6 411 15 Average Daily Arrivals July 217 22 18 247 67 221 148 146 1 n/a June 217 13 1 145 6 33 216 21 1 n/a 12 Month Avg. 1 153 8 2 173 54 1 3 279 179 173 1 n/a Departures (7 a.m. to 1 p.m.) Arrivals (7 a.m. to 1 p.m.) 6% 6% 5% 5% 4% 4% 3% 3% 2% 2% 1% 1% % % Percentage Departure Utilization Percentage Arrival Utilization July # July 2 14 1 28 2 21 3 25 23 14 6 # 16 Chicago Department of Aviation Page 5 July 217

Runway Use Report Chicago O'Hare International Airport Period: July 217 Time of Day: 1: p.m. to 7: a.m. Runway Use (1 p.m. to 7 a.m.) Source: Airport Noise Management System (ANMS) Runway Utilization 4L 4R 9L 9R 1L 1C 1R 15 22L 22R 27L 27R 28L 28C 28R 33 Average Daily Departures July 217 8 27 27 2 1 17 3 34 1 June 217 4 16 19 2 1 22 1 5 6 12 Month Avg. 2 17 12 2 1 16 7 33 15 Average Daily Arrivals July 217 7 12 3 13 47 1 2 2 5 31 7 25 13 n/a June 217 4 7 2 9 24 1 5 7 53 1 35 1 n/a 12 Month Avg. 2 6 2 12 21 2 2 7 38 4 27 12 n/a Departures (1 p.m. to 7 a.m.) Arrivals (1 p.m. to 7 a.m.) 6% 6% 5% 5% 4% 4% 3% 3% 2% 2% 1% 1% % % Percentage Departure Utilization Percentage Arrival Utilization July 6 # July 3 7 4 8 1 21 2 19 26 21 8 1 8 2 2 28 15 # 13 1 4 Chicago Department of Aviation Page 6 July 217

Aircraft Noise Report Chicago O'Hare International Airport Period: July 217 Metric: Aircraft DNL RMT Community Last 12 Months Monitored Noise Levels Last 12 Month Modeled Modeled Modeled OMP # Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul 1 Jul Average 1997 2 Build Out 16 16 16 16 16 17 17 17 17 17 17 17 16 vs 1997 2 Values Values Values 1 Arlington Heights 56. 58.2 57.9 56.5 54.7 55.2 56.1 54. 57.2 59.6 53.7 58.6 56.7 56.9 63. 63. 5.5 2 Melrose Park 58.2 58.6 6.8 62.1 56.3 46. 5.1 53.9 57.3 57.6 62.1 64.4 59.1 59.4 63.4 61. 5.3 3 Bensenville 64.2 63.4 64.5 65. 65.9 64.6 63.8 63.7 63.4 64.2 65. 64. 63.6 64.4 71.3 67.3 64.9 4 Schiller Park 58.6 6.9 58.3 59.5 6.8 56.4 55.3 55.8 56.9 58.1 58.5 57.7 59.4 58.4 62.6 62.6 58.8 5 Chicago 61. 61.4 6. 6.3 6.5 58.6 59.2 59.1 6.9 61.8 62.1 61.8 61.1 6.7 6.8 59.8 61.9 7 Des Plaines 5.7 51.7 52.6 51. 51.5 51.7 5.7 49.7 51.5 51.7 51.3 53.3 51.7 51.5 65.4 62. 48.5 8 Des Plaines 54.9 56. 57.2 57.2 57.8 55.4 55.4 54.6 55.8 59. 58.9 6.5 55.3 57.3 7. 68.8 6.8 1 Rolling Meadows 54.8 58.5 59.9 59.9 58.5 53.1 5.9 52.8 53.5 56.7 55.6 55.9 56.8 56.7 59. 6.8 48.9 11 Chicago 55.1 54.7 54.3 56.1 54.2 51.8 52.7 52.9 54.9 55.5 54.8 58.4 55.6 54.9 6.9 6.7 5.3 12 Elk Grove Village 59.2 64.2 59. 59.7 61.5 6.6 61.2 6.4 62.4 64.6 59.3 61. 64.1 61.5 66.7 62.1 57.6 13 Elk Grove Village 67.9 69.2 68.1 68.3 66.1 63.7 64.4 64.5 67.1 67.3 66.3 68.5 68.5 67.1 8. 77.6 64.6 14 Elk Grove Village 58.9 59. 6.7 58.2 59.4 6.6 59.5 58.8 6.1 6.3 -- 6.5 59.7 59.7 67.6 65.7 54.5 15 Franklin Park 52.8 55.6 53. 56.1 55.8 52.4 55. 5.3 53.5 54.1 52.4 53.3 52.7 54. 64.1 62.6 53.6 16 Franklin Park 62.5 63.1 62.4 65.2 65. 64.7 62.3 62.3 61.6 62.2 64.3 63.1 61.4 63.4 72.2 72.1 63.4 17 Harwood Heights 63.6 64.5 65.3 62.8 61.9 63.1 62.4 62.6 63.2 64.6 63.9 64.3 63.8 63.6 66.4 65.4 57.9 19 Stone Park 54.5 55.9 55.8 54.2 54.7 54. 52.6 54.4 52.6 53.7 53.6 54.2 53.9 54.3 64.7 61.7 51.6 2 Mount Prospect 54. 55.2 54.4 53.2 53.9 51.8 51.2 51.4 52.5 53.7 52.2 53.1 55.1 53.2 63.5 62.4 49.1 21 Mount Prospect 53.9 56.1 52.6 53.7 5. 52.8 48.4 49.6 49.1 53.3 53.4 53.7 49.4 52.8 59.6 58.6 53.6 22 Norridge 66.5 66.3 66.3 64.8 63.9 65.2 64.9 64.6 66. 66.9 66.2 67.3 66.5 65.9 69.2 67.7 59.2 23 Northlake 62.9 62.7 63.4 63.3 63.9 63. 61.5 62. 61.3 61.9 63.8 63.4 62.2 62.8 73.5 69.1 59.6 24 Park Ridge 53.5 57.1 55.8 54.3 53.2 49.6 52. 5.9 54.4 56.5 53.6 56.6 55. 54.5 6.3 58.8 5.6 25 Park Ridge 62.7 63.3 64.2 63.9 61.8 59.8 62.1 6.8 63.5 64.4 61.6 63.9 64.2 62.9 69.1 61.8 66.7 26 Park Ridge 57.9 58.9 6.2 58.5 57.6 54.4 57. 55.8 58.8 59.6 57.5 6. 59.4 58.3 64. 61.2 59.5 27 Rosemont 7.2 7.2 7.4 71.1 69.2 66.4 69.1 67.4 7.2 7.7 68.6 7.1 71.3 69.7 73. 67.6 7.2 28 Schiller Park 75. 75.4 -- 73. -- 75.3 74.4 74. 75.3 75.8 74.8 75.6 74.8 74.9 79.6 78.7 67.9 29 Wood Dale 67.8 66.8 67. 67.1 66.5 64.2 65.7 64.9 67.9 67.8 66.9 67.8 67.7 66.9 n/a n/a 65.1 3 Wood Dale 55. 54.9 56.4 57.5 58.5 -- 59. 58.9 58.2 58.1 58.8 58.2 57. 57.8 n/a n/a 58.5 32 Wood Dale 66.9 66. 65.4 65.2 66.1 66.2 65.1 65.4 63.7 64.6 66.6 65.6 65.7 65.6 71.2 66.4 63.8 33 Park Ridge 62.7 62.6 62.9 63.4 62.7 61.4 61.8 61.4 61.6 62.5 63.7 63.5 62.6 62.6 n/a n/a 61.9 34 Elk Grove Village 65.6 61.7 59.8 57.9 59.3 57.7 57.1 57.7 56.9 58.1 6.8 58.6 65. 6.1 66.3 61.2 61.4 35 Unincorporated Cook 57.4 59. 6.4 58.8 59.5 58.5 59. 57.5 57. 57.5 58.5 58.5 57.4 58.6 7.8 65.4 54.7 37 Mount Prospect 5.3 58.7 58.6 51.1 52.1 47.7 47.6 46.9 47.3 5.4 52.6 55.9 5.6 53.6 55.1 57. 5.5 42 Chicago 59.7 61.1 6.7 61.7 59.1 57.3 57.7 57.9 58. 58.7 59.4 6. 59.4 59.5 n/a n/a n/a -- Data unavailable. n/a - Not Applicable 1. Red represents an increase of 1 db or more from the same month of the previous year (12 monitors). Green represents a decrease of 1dB or more from the same month of the previous year (5 monitors). 2. Red represents an increase of 1 db or more from the modeled 1997 noise contour level ( monitors). Green represents a decrease of 1dB or more from the modeled 1997 noise contour level (29 monitors). 3. The following 41 monitor days were excluded due to high community noise values: All (4); Site 5 (15); Site 8 (3); Site 12 (21); Site 22 (3); Site 24 (3); Site 28 (3,15,22); Site 42 (3). 4. The following 34 monitor days were not available due to malfunction: Site 1 (11-14); Site 14 (2-11); Site 2 (12); Site 3 (13-16, 21-27, 31); Site 37 (2-21). 5. Data is included for all days where data is collected for greater than 9% of the day. Chicago Department of Aviation Page 7 July 217

Chicago Department of Aviation Page 8 July 217

Noise Complaint Report Chicago O'Hare International Airport Period: July 217 Monthly Complaints by Community 1 Nature of Noise Complaints Community Complaints Complainants All Hours Nighttime All Hours Nighttime Addison 119 7 6 2 All Hours Arlington Heights 2 7,395 441 4 4 Bartlett 2,517 356 8 5 Bensenville 3 117,99 87,463 33,113 23,314 Berkeley 2 1 2 1 Bloomingdale 2,44 542 178 8 Burlington 1 -- 1 -- Campton Hills 2 -- 2 -- Carol Stream 14 2 1 1 Chicago 4 7,636 14,377 1,226 4,45 Ward 38 8,253 1,885 36 23 Ward 39 1,68 2,158 72 41 Ward 4 1,151 368 13 1 Ward 41 26,753 3,472 234 139 Ward 45 4,836 1,581 43 35 Ward Other 9,78 1,147 39 31 Ward Unknown 9,795 3,766 9,789 3,766 Darien 1 -- 1 -- Des Plaines 576 219 17 9 Downers Grove 1 -- 1 -- East Dundee 21 -- 21 -- Elgin 2,222 181 296 4 Elk Grove Village 5 52,174 4,744 27,883 2,43 Elmhurst 1,518 652 129 91 Nighttime - 1: p.m. - 7: a.m. Elmwood Park 19 9 17 8 Evanston 1,239 267 21 14 Franklin Park 54 24 11 9 Geneva 21,22 3,59 2,981 3,58 Gilberts 4,578 165 1 1 Glenview 311 252 33 14 Hanover Park 1,587 259 2 2 Harwood Heights 138 52 12 6 Hillside 5 2 1 1 Huntley 1 1 1 1 Itasca 6 17,772 3,275 18 15 La Grange Park 1 -- 1 -- Lincolnwood 2,924 356 6 4 Lombard 44 4 13 1 Medinah 6,73 1,155 92 71 Melrose Park 3 2 2 2 Morton Grove 25 8 1 1 Mount Prospect 537 183 3 2 Niles 7 15,433 1,478 11 7 Norridge 3,927 1,943 25 18 Northbrook 54 31 1 1 Palatine 6 1 7 6 Park Ridge 8 3,174 4,431 851 277 Pingree Grove 22 -- 1 -- Prospect Heights 1 -- 1 -- River Forest 2,81 25 2,81 25 River Grove 2 -- 13 -- Method of Noise Complaint Roselle 2,44 541 7 5 Phone.1% Rosemont 134 67 4 2 Internet 99.9% Schaumburg 12,5 8,882 9,864 8,43 Total 1% Schiller Park 9 11,771 1,6 22 14 Skokie 1,519 221 7 2 Notes: Sleepy Hollow 1,12 29 9 47 1. Complaints made within the State of Illinois. South Barrington 4 3 2 1 2. 7,249 of 7,395 complaints in Arlington Heights came from 1 address. South Elgin 256 84 3 2 3. 77,834 of 117,99 complaints in Bensenville came from 3 addresses. St. Charles 121 4 6 2 4. 11,885 of 7,636 complaints in Chicago came from 2 addresses. Streamwood 1 1 1 1 5. 13,65 of 52,174 complaints in Elk Grove Village came from 2 addresse Unincorporated Cook 91 1 1 1 6. 11,615 of 17,772 complaints in Itasca came from 1 address. Villa Park 88 67 2 2 7. 1,921 of 15,433 complaints in Niles came from 1 address. Wayne 766 249 3 2 8. 9,92 of 3,174 complaints in Park Ridge came from 1 address. West Chicago 285 72 19 1 9. 8,113 of 11,771 complaints in Schiller Park came from 1 address. West Dundee 32 -- 2 -- 1. 14,421 of 72,626 complaints in Wood Dale came from 1 address. Westchester 4 -- 1 -- 11. 33,85 of 33,113 complainaints in Bensenville are anonymous. Western Springs 57 1 2 1 12. 9,899 of 1,226 complainaints in Chicago are anonymous. Westmont 1 1 1 1 13. 27,848 of 27,883 complainants in Elk Grove Village are anonymous. Wheaton 52 12 2 2 14. 2,975 of 2,981 complainants in Geneva are anonymous. Winnetka 5 5 2 2 15. 9,845 of 9,864 complainants in Schaumburg are anonymous. Wood Dale 1 72,626 12,724 41,448 9,858 16. 41,378 of 41,448 complainants in Wood Dale are anonymous. Community Unknown 19,384 1,176 19,384 1,176 July 217 Total 49,368 152,616 167,779 53,37 Previous Month Total 483,252 138,933 133,39 48,5 11 12 13 14 15 16 Aircraft Noise 43% Not Reported 1% Not Reported 1% Aircraft Noise 25% Frequency of Operations 18% Frequency of Operations 13% Vibration 2% Low Flying 61% Vibration 1% Low Flying 37% Chicago Department of Aviation Page 9 July 217

Chicago Department of Aviation Page 1 July 217

O Hare Noise Hotline: 1-8-435-9569 www.flychicago.com/ordnoise