Part 150 Presentation

Transcription

1 Part 150 Presentation Public Workshop 3 October 27, 2010 Seattle Tacoma International Airport Classroom C Temporary Noise Measurement Program Please note that these materials are draft and may not reflect the exact information presented at the workshop. Because these presentations are intended to be visual tools to aid the presenter at the workshop, some information may not be easily understood without the benefit of hearing the presenter. Therefore, everyone is encouraged to attend the workshop to hear the presentation and to ask questions. 1

2 Program overview Agenda Summary of Measurement Program 2

3 3 Temporary Measurement Program Supplemental Measurement Program: - 13 sites were selected: - To respond to specific requests brought up by the public that are not already covered by one of the 25 permanent sites How loud is it here? - Further than 1 mile from a permanent monitor - To gather technical (Single Event) data to supplement permanent monitor data - Dozens of residents within selected areas were called to participate - Measurements were conducted by: - 2 L&B Technicians - 6 Portable Noise Monitors: 2 B&K 2238 s, 3 LD 824 s, 1 EMU - 11 sites measured in 12 days: June 28 th thru July 9 th plus 2 Vashon sites in July and September - About 3 to 4 days of measurements per site -

4 4 Temporary Measurement Program Supplemental Measurement Program: - Noise event to flight track correlation - Noise levels louder than 60 db and longer than 3 seconds = Noise Event - Identified aircraft and time of flyovers using radar data - Matched aircraft flyover with noise event - If not an Aircraft noise event, then it was marked as a Community (non-aircraft) noise event - Simultaneous Aircraft and Community noise events were counted as Aircraft noise events

5 5 Temporary Measurement Program Supplemental Measurement Program: - 13 sites selected SITE A B C D E F G H I J K L M ADDRESS 1046 S Elmgrove St, Seattle th Ave SW, Burien th Ave S, Burien 537 S 137 th Pl, Burien Sylvester Rd SW, Burien Des Moines Memorial Dr, Burien 360 SW 178 th St, Normandy Park Edgecliff Dr SW, Normandy Park th Ave S, SeaTac Marine View Dr, Des Moines 1811 SW 152 nd St, Burien th Ave SW, Vashon SW 116 th PL, Vashon

6 6 Temporary Measurement Program Airport Permanent Monitors 1 Permanent Monitors

7 7 Temporary Measurement Program Temporary Measurement Sites 1 A Permanent Monitors Temporary Sites

8 8 Air Traffic Flow - Direction of Air Traffic during temporary noise measurements - Sea-Tac s average yearly air traffic flow is approx. 65% South/ 35% North Days of Site Start Date End Date monitoring North/South A 6/28/10 7/1/ % / 82% B 7/5/10 7/9/ % / 6% C 7/6/10 7/9/ % / 0.5% D 7/6/10 7/9/ % / 0.5% E 7/2/10 7/5/ % / 85% F 6/28/10 7/4/ % / 85% G 6/29/10 7/4/ % / 82% H 7/2/10 7/5/ % / 85% I 7/6/10 7/9/ % / 0.5% J 6/28/10 7/1/ % / 82% K 7/5/10 7/9/ % / 6% L 7/14/10 7/22/ % / 72% M 9/16/10 9/19/ % / 86%

9 9 Site C - North of Sea-Tac - Church Rooftop

10 10 Air Traffic Map - Noise events were matched with flights using the airport noise system - Three days of air traffic Arrivals Departures A Overflights Temporary Sites

11 11 Maximum Noise Levels at Site C

12 12 Sample Aircraft Noise Event at Site C

13 13 Site J - South of Sea-Tac - Residence

14 14 Air Traffic Map - Three days of air traffic - 18% North Flow 72% South Flow Arrivals Departures A Overflights Temporary Sites

15 15 Maximum Noise Levels at Site J

16 16 Sample Aircraft Noise Event at Site J

17 17 Site M - West of Sea-Tac on Vashon Island - Residence

18 18 Air Traffic Map - Three days of air traffic - 14% North Flow 86% South Flow - Most flights are between 7,000-11,000 feet of altitude Arrivals Departures A Overflights Temporary Sites

19 19 Maximum Noise Levels at Site M

20 20 Sample Aircraft Noise Event at Site M

21 21 Cumulative Noise Levels Temporary Measurement Program - Approximately 6,000 aircraft noise events recorded - Individual aircraft noise levels are available in measurement report Site Aircraft DNL* Community DNL Number of Aircraft Events A B C D E F G H I J K L 39.0 ** 43 M * DNL value represents the measurement period only and should not be compared to an annual DNL value.

22 22 Measurement Findings Summary of Measurement Program - Single Event noise measurements collected - Most sites had community events, e.g, cars, lawnmowers, neighborhood noise, birds, etc. - Vashon ambient is lower than other sites. Flights are at higher altitude but noticeable - Sites F and G are below field elevation. Modeling assumptions are valid - Taxiing noise was audible at Site I

23 23 Noise Model Validation Summary of Measurement Program - Permanent monitor data was compared to noise model data Grid Point Analysis - Found that the Noise Model slightly overestimates noise levels as compared to measured noise levels

24 24 Questions?