O'HARE NOISE SURVEY

       UNITED STATES ENVIRONMENTAL PROTECTION ACENCY  - REGION V
                                DATA REPORT
A two day noise study was undertaken by  the U.  S,  Environmental  Pro-
tection Agency, Region V Office in response to  a request  by  Congressman
Abner Mikva for current aircraft noise level data  around  O'Hara  Airport.
A summer noise intern from the Office of Noise  Abatement  PIVJ Control
supervised the survey.

Under Title IV, Section 402C of the 1970 Clean  Air Act,  the  United States
Environmental Protection. Agency is authorized to work directly with any
Federal agency toward the abatement of existing noise problems.   As a
result, U. S. EPA has been working with Great Lakes Federal  Aviation
Administration (FAA) and will 'supply them  this  data.
                          DESCRIPTION OF THE  SURVEY

On August 24 and 28,  1972, quantitative noise measurements  were  made by
EPA at 15 locations around O'Hare  (See attached maps).   At  many  of the
locations, residents  were interviewed to obtain their  subjective com-
ments or, the noise problem.

Equipment employed for  the measurements included  3  sound level meters
(General Radio Model  1565-B)  and a graphic  level  recorder (General Radio
Moclel 1521-B).  The sound level meters were used  to  obtain  the peak sound
pressure levels radiating from the aircraft.  The "A"  -  weighing  circuit
a-ad the fast meter response were both activated.  "A"  -  weighing  is a
method of modifying the  instrument frequency  response  so that it reacts
nearly like the human ear.  See Figure 1.
LA
S
                         BO  100  200
                                       5OO  1OOO  2OOO  50OO 10.000 ?0.000
                                  FREQUENCY (Hz)
                   Fig.l,  A,B,C,  and  D  sound weighing curves.

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  The fast meter response permits the sound level meter to respond to the
  short duration jet noise level fluctuations.  The graphic level recorder
  was used only at the first 3 locations (there is a substantial setup time
  for the  equipment).  The recorder produced curves showing the variation
  of sound level with time.  It is important to compare this graphical data
  with the peak readings from the sound level meter.  Peak sound readings
  representing very short time intervals do not in themselves fairly represent
  a noise problem.

  Test locations were selected for the following reasons:  Location No. 5 was
  chosen to show the highest noise Levels expected at any residential area
  around O'Hare Field.  Location Nos. 1,2,7,8,9,10,11, and 12 were chosen to
Sound Levels and H.-man Response

-
Crrier Deck
Jet Operation


Jet Takeoff
(200 feet)
Discotheque
Auto Horn (3 feet)
Riveting Machine
Jet Takeoff
(2,000 feet)
Garbage Truck
N Y. Subway
Station
Heavy Truck
iSSSr Hearing
•"•''''•' , Response Effects
i?
--
••i r.<\ ::>• Loud i-
•r : f i .pi.fied <~
c:
Ci-
* .-..rriurrt Vccal ^
0
fL
ir
LJ
X
! O
Very Annoying
Z
: Hearing Damage O
(50 feet) ; (8 hours) t-
Pneumatic Drill ! , JjJ
(50 feet)
Alarm Clock
. Freight Train
(50 feet)
Freeway Traffic
(50 feet)

Air Conditioning
Unit (20 feet)

Light Auto Traffic
(100 feet)
Living Room
Bedroom

Library
Soft Whisper
(15 feet)


Broadcasting
Studio


i


1 —
Annoying P^
i g
o
O
Telephone Use y
Difficult
Intrusive



Quiet





Very Quiet




i


Just Audible
j
Threshold of
Hearing
Conversational
Relationships


-






!
* *
'• Noise
Shouting in ear Level
^ 100
Curves Show How the Level of Noise
Shouting at 2 ft. Varies Wilh Distance

/
Very loud ' 90
Conversation, 2 ft.

Loud
Conversation, 2 ft.
80
Loud
Conversation, 4 ft.

Normal ' 70
Conversation, 12 ft.



60




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Distance Between Talker & Listener — ft

                   Fig.  2
Fig. 3

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obtain noise data beneath landing patterns for future analysis of noise
abatement landing procedures.  Location Nos. 3,4,6,13, and 14 were chosen
beneath takeoff patterns for a possible comparison between takeoff and
landing noise.  Location Nos. 2 and 7 are near large schools.  Location
Nos. 14 and 15 are both near large, vacant land areas.

The new, quieter DC-lOs, L-lOlls, and 747s represented 1.370 of the 218
aircraft measured.
                             RELATION OF DATA TO HUMAN RESPONSE

The two charts shown in Figures 2 and 3 are useful in relating sound pressure
levels to human response.  Both charts were taken from a  U. S. EPA Public
Relations Circular, "Noise, Unwanted By-product of Modern Life."
                       EXPLANATION OF THE DATA PRESENTATION

Parameters and data for each location are presented on pages 7  through 27.
The Overflight  A.ngle is a method used to describe the directional location
of the aircraft during it's flight past the test location.   To  determine
this parameter, the observer first faced the runway under study.   See
Figure 4.  Then, as an aircraft passed, the angle "&" to the "Left" or
"Right" is recorded.  If the flight path is at 90°, then the description
"Overhead" is used.  See Figure 5.
                                            \
        •ra-
                                                                            •O
         Fig.  4
Fig. 5

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In some cases, the Neighborhood Noise was measured to provide an indication
of background noise levels exceeded by the aircraft.  These were average,
not peak readings.  The Time Period indicates the beginning and ending times
for the series of measurements made at each location.  Contained in paren-
thesis is the number of minutes within the time period.  Average time be-
tween overflights indicates the repetitive nature of the noise at each
location for the time of day studied.

To summarize the noise data at each location, the high, low, and average
peak noise levels were calculated and reported.  This was done separately
for all aircraft and for each type.  The 727/737/DC-9 aircraft were grouped
together as having similar noise characteristics.  Other aircraft types
grouped in a similar manner are DC-8/707/DC-8 STRETCH, DC-lO/L-1011, 747,
all business jets, all turbo prop aircraft, and all non-turbo prop planes.
The number of aircraft measured at each location is also indicated.

Graphical data taken at location Nos. 1,2, and 3 is presented following
each of the location reports.   The horizontal axis on the graph indicates
time and the vertical axis the instantaneous noise level for each point
of time.  A Noise Exposure Analysis based on each of the three graphical
data sets shows the time duration and the percentage of time that noise
exceeds each of two specified levels.  The first level, 65 DBA, was chosen
as a sound pressure twice as loud as the normal neighborhood background
level of 55 DBA (a 10 DB increase appears as twice the loudness to the
human ear).  The second level of 85 DBA was chosen as an annoying noise
level at which shouting at 2 feet is required in order to communicate.

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#1    LOCATION:    2032 Welwyn,  Des PLaines,  Illinois
                  (Near Birch and Howard)


      DATE:    August 24,  1972

      WEATHER:  Heavy overcast, 75 degrees,  wind  S.W.  at 10 mph.

      RUNWAY STUDIED:   22R,  Landings

      DISTANCE TO RUNWAY END (MILES):    1.7

      OVERFLIGHT ANGLE (DEGREES):   Overhead

      NEIGHBORHOOD:   Old,  single family residential; heavy tree cover
                                                                 *
      NEIGHBORHOOD NOISE (DBA):  -

      TIME PERIOD (MIN.):    9:32  - 10:53 A.M.    (81)

      AVG. TIME BETWEEN OVERFLIGHTS (MIN.):    1.8
      AIRCRAFT TYPE
NO.
     PEAK NOISE (DBA)
HIGH         AVG.
                                                                   LOW
727/737/DC-9
707/DC-8/STRETCH
DC-10/L1011
BUSINESS JET
TURBO PROP
NON-TURBO PROP
ALL TYPES
21
7
2
3
6
6
45
97
102
88
88
87
78
102
92
97
86.5
86
84
74
88.9
85
87
85
84
81
68
68
      COMMENTS:   The  resident  at  2019 Welwyn permitted interior noise
                 readings  to be made:

                 Door open -   73 DBA (707)

                 Windows and doors  closed  - 60 DBA  (707)

                 The  above interior noise  levels greatly annoyed the
                 residents.  They also  stated that  everytime a jet passes
                 over^their TV ghosts severely.  They have not noticed an
                 improvement within the  last year although they have heard
                 some of the quieter jets  recently  introduced.  See Graphic
                 Level  Recorder output  data attached.

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             NOISE EXPOSURE ANALYSIS FOR LOCATION NO. 1

                 10;24  -  10:54 A.M.  AUG 24, 1972
AIRCRAFT TYPE         TIME (SECONDS) DURING WHICH THE SPECIFIED NOISE
                      LEVELS WERE EXCEEDED FOR ONE OVERFLIGHT

                                          65 DBA          85 DBA
DC-8/707/STRETCH                          28              10
727/737/DC-9                              24               6t
PROP JET                                  16              -
PERCENT OF TIME DURING WHICH THE SPECIFIED NOISE LEVELS WERE EXCEEDED
BY ALL OVERFLIGHTS BETWEEN  10:24  -  10:54 A.M. :     65 DBA   -   24%
                                                      85 DBA   -  4.27.

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LOCATION:   Maine East Township High School, Park Ridge, Illinois
            (East side of School)^


DATE:    August 24, 1972

WEATHER:   Cloudy, 78 degrees, wind S.W. at 12 mph

RUNWAY STUDIED:  22R, Landings

DISTANCE TO RUNWAY END  (MILES):   3.5

OVERFLIGHT ANGLE  (DEGREES):   65 - 75 degrees, Left

NEIGHBORHOOD:   5,000 student  high school surrounded by residential
                single and townhouse units
NEIGHBORHOOD NOISE (DBA):

TIME PERIOD (MIN.):    12:29 - 1:24 P.M.  (55)
AVG. TIME BETWEEN OVERFLIGHTS  (MIN.):     3.2
AIRCRAFT TYPE
NO.
     PEAK NOISE (DBA)
HIGH         AVG.
                                                              LOW
727/737/DC-9
707/DC-8/STRETCH
TURBO PROP
NON-TURBO PROP
ALL TYPES
9
1
3
4
17
88

80
74
94
84
94
78.6
72
80.9
80

78
63
63
COMMENTS:  Interior noise measurements were made in the old section
           of the school:  Passage between buildings - 78 DBA (727)
           1st floor, window closed  - 58 DBA (727)
           3rd floor, window closed  - 69 DBA (727)

           In an interview, the school nurse stated that teachers
           had been bothered by the noise in certain classrooms.

           See\ Graphic Level Recorder Data attached.

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#3     LOCATION:   2942 La Porte,  Franklin Park,  Illinois
                   (Near Grand and Wolf)-

       DATE:      August 24,  1972

       WEATHER:   Partly cloudy,  82 degrees,  wind S.W.  at 10 mph

       RUNWAY STUDIED:   22L,  Takeoff

       DISTANCE TO RUNWAY END (MILES):   2.33

       OVERFLIGHT ANGLE (DEGREES):  Overhead  and  50  degrees,  Left

       NEIGHBORHOOD:  Old,  single  family  residential

       NEIGHBORHOOD NOISE (DBA):

       TIME PERIOD (MIN.):   3:33  - 3:52  P.M.  (19)
       AVG. TIME BETWEEN OVERFLIGHTS (MIN.):   1
       AIRCRAFT TYPE
        (OVER HEAD)
NO.
     PEAK NOISE (DBA)
HIGH         AVG.
                                      LOW
727/737/DC-9
707/DC-8/STRETCH
BUSINESS JET
ALL TYPES
AIRCRAFT TYPE
(50 DEGREES, LEFT)
727/737/DC-9
707/DC-8/STRETCH
BUSINESS JET
NON-TURBO PROP
ALL TYPES
2
2
1
5
NO.
8
1
1
1
11
95
96

96
HIGH
96


96
94.5
95
95
94.8
PEAK NOISE (DBA)
AVG.
87.6
86
82
63
93.2
94
94

94
LOW
74


63
       COMMENTS:  Resident stated that he had lived at the above location for
                  20 years and had become accustomed to the noise.  He has
                  noticed the quieter DC-10 and 747 overflights.

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                                                       ( *
#4     LOCATION:    Cindy and Forest,  Des  Plaines,  Illinois
                   (  2 blocks North of Maine  West  High  School)

       DATE:    August 24,  1972

       WEATHER:    Partly cloudy,  80 degrees,  wind  S.W.  at 5 mph

       RUNWAY STUDIED:   14L, Takeoff

       DISTANCE TO RUNWAY END (MILES):    1.76

       OVERFLIGHT ANGLE (DEGREES):    Overhead

       NEIGHBORHOOD:   Grade  School  and suburban residential

       NEIGHBORHOOD NOISE (DBA):    52

       TIME PERIOD (MIN.):   5:25  -  6:01 P.M.  (36)
       AVG. TIME  BETWEEN OVERFLIGHTS (MIN.):    13
       AIRCRAFT TYPE
NO.
PEAK NOISE (DBA)

727/737/DC-9
707/DC-8/STRETCH
ALL TYPES
-
2
1
3
HIGH
86

92
AVG.
84
92
86.6
LOW
82

82
       COMMENTS:   In order  to pass over this location, a sharp turn to the
                  North was  required immediately after takeoff.  Of 16 planes
                  measured,  3 veered over the above location.  The average peak
                  sound for  the other aircraft passing West of the location was
                  73 DBA.

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#5    LOCATION:   Morse and Chestnut,  Des  Plaines,  Illinois
                  (4 blocks N.W.  of Mannheim and  the  N.W.  Tollway)

      DATE:     August 24,  1972

      WEATHER:    Partly cloudy,  75 degrees,  wind S.W.  at  5 mph

      RUNWAY  STUDIED:    22R,  Landings

      DISTANCE  TO RUNWAY END  (MILES):  .68  (3,590  feet)

      OVERFLIGHT ANGLE (DEGREES):   Overhead

      NEIGHBORHOOD:   Old,  single family suburban ranch homes with  tree cover;
                      O'Hare boundary  and  industrial  park  lie to  the S.W.
      NEIGHBORHOOD NOISE (DBA):   -

      TIME PERIOD (MIN.):   9:23 -  9:32 P.M.  (9)
      AVG. TIME BETWEEN OVERFLIGHTS (MIN.):    1.2
      AIRCRAFT TYPE
NO.
     PEAK NOISE (DBA)
HIGH         AVG.
                                                                    LOW
727/737/DC-9
707/DC-8/STRETCH
ALL TYPES
3
4
7
112
118
118
108
112
110.2
102
108
102
       COMMENTS:  This residential location was chosen as an example of
                 the highest noise level around O'Hare.

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 LOCATION:    Landmier Road  and  Dierting,  Des  Plaines,  Illinois
             (5  blocks N.W.  of  Touhy  and  Elmhurst)


 DATE:    Augr-i;  It  •  August 25,  1972

 WEATHER:    Pi^ly.,,  ady,  75 degrees, wind S.W.  at  5  mph

 RUNWAY  STUDIED:    14R, Takeoff

 DISTANCE TO RUNWAY END (MILES):   1.78

 OVERFLIGHT  ANGLE (DEGREES):   Overhead

 NEIGHBORHOOD:  Single  family,  suburban residential North of Landmier
               Road;  industrial park to  the  South.
 NEIGHBORHOOD N.OT .- ,'i
TIME  PERIOD  u'ilN-,-   11:52 - 12:22 A.M.  (30)

AVG.  TIME BETWEEN OVERFLIGHTS  (MIN.):   3
AIRCRAFT TYPE
NO.
      PEAK NOISE (DBA)
 HIGH          AVG.         LOW
727/737/DC-9
707/DC-8/STRETCH
NON-TURBO PROP
 3
 6
 1
102
109
98.3
100.5
81
96
91
ALL TYPES
10
109
97.9
81
COMMENTS:   NONE

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#7    LOCATION:  Cumberland and Glendale, Park Ridge, Illinois
                 (Near Cumberland and T-194)

      DATE:    August 28, 1972

      WEATHER:    Clear sky, 75 degrees, and N.W. wind at 5 mph

      RUNWAY STUDIED:   27R, Landings

      DISTANCE  TO RUNWAY END (MILES):   2.93

      OVERFLIGHT ANGLE (DEGREES):     35 - 75 degrees, Left

      NEIGHBORHOOD:   Old, two-story, single family residential, heavy
                     tree cover
      NEIGHBORHOOD NOISE (DBA):   50

      TIME PERIOD (MIN.):  9:25 - 9:42 A.M. (17)
      AVG. TIME BETWEEN OVERFLIGHTS (MIN.):  2.8
      AIRCRAFT TYPE
NO.
     PEAK NOISE (DBA)
HIGH         AVG.
                                                                   LOW
727/737/DC-9
NON-TURBO PROP
ALL TYPES
4
2
6
79
69
79
78.5
66
74
78
63
63
      COMMENTS:  This flight path is directly over the Kennedy Expressway.

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                                                       t -
#8    LOCATION:   Bryn Mawr and Delphia, Chicago, Illinois
                  (2 blocks South of the Kennedy across from the Harriot  Inn)

      DATE:     August 28, 1972

      WEATHER:  Clear sky, 82 degrees, N.W. wind at 5 mph

      RUNWAY STUDIED:    27R, Landings

      DISTANCE TO RUNWAY END (MILES):   2.55

      OVERFLIGHT ANGLE (DEGREES):   50 - 80 degree, Right

      NEIGHBORHOOD:  Very dense residential with 3 story apartments and the
                     20 story Lamp Lighter Complex (all new)
      NEIGHBORHOOD NOISE (DBA):  57

      TIME PERIOD (MIN.):   10:18 - 11:18 A.M. (60)

      AVG. TIME BETWEEN OVERFLIGHTS (MIN.):   3.3
      AIRCRAFT TYPE
NO.
     PEAK NOISE (DBA)
HIGH         AVG.
                                                                   LOW
?27/737/DC-9
707/DC-8/STRETCH
NON-TURBO PROP
ALL TYPES
10
5
3
18
87
94
77
94
82.7
90.6
73
83.2
75
82
67
67
      COMMENTS:  A British-West Indies 727 was 10 DBA quieter than an
                 American 727 at same altitude and location.
                 The flight path here is along the Kennedy Expressway.

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#9      LOCATION:    2009 Ashland,  Park Ridge,  Illinois
                    (Just North of the Ketmedy Expressway)

        DATE:    August  28,  1972

        WEATHER:    Clear sky,  82 degrees, N.W.  wind at  5 mph

        RUNWAY  STUDIED:   27R,  Landings

        DISTANCE TO RUNWAY END (MILES):  3.3

        OVERFLIGHT ANGLE (DEGREES):     70 - 85  degrees, Left

        NEIGHBORHOOD:  Close-spaced, single family, residential

        NEIGHBORHOOD NOISE (DBA):   60 - 65

        TIME  PERIOD (MIN.):     10:25 -  10:45 A.M. (20)
        AVG.  TIME  BETWEEN OVERFLIGHTS  (MIN.):    5
       AIRCRAFT  TYPE
NO.
     PEAK NOISE (DBA)
HIGH         AVG.        LOW
727/737/DC-9
707/DC-8/STRETCH
TURBO PROP
ALL TYPES
2
1
1
4
86


86
81.5
80
77
80
77


77
       COMMENTS:  Flight path is over the Kennedy Expressway.

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#10     LOCATION:    9540 Bryn Mawr,  Rosemont,  Illinois
                    (3 blocks West of  River  Road)
        DATE:     August 28,  1972

        WEATHER:    Clear sky,  85 degrees,  N.W. wind  at  5 mph

        RUNWAY  STUDIED:     27R,  Landings

        DISTANCE  TO RUNWAY  END (MILES):     1.28

        OVERFLIGHT  ANGLE (DEGREES):    35  - 50 degrees,  Right

        NEIGHBORHOOD:   Trailer Park,  farm house, and light  industry
                                                                  «,
        NEIGHBORHOOD NOISE  (DBA):     58

        TIME  PERIOD (MIN.):    11:11  -  11:44 A.M. (33)

        AVG.  TIME BETWEEN OVERFLIGHTS  (MIN.):    3
       AIRCRAFT  TYPE
NO.
     PEAK NOISE (DBA)
HIGH         AVG.
                                                                     LOW
727/737/DC-9
707/DC-8/STRETCH
NON-TURBO PROP
ALL TYPES
7
2
2
11
87
96
72
96
84.8
95.5
69.5
84
81
95
67
67
        COMMENTS;  Aircraft  land over  the Kennedy Expressway.

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                                                 t -
LOCATION:   Oleander and Seminole, Chicago, Illinois
            (Between Harlem and Canfield)


DATE:    August  28,  1972

WEATHER:   Clear sky, 85 degrees, wind N.W. at 5 mph

RUNWAY STUDIED:   27R, Landings

DISTANCE TO RUNWAY  END (MILES):    3.77

OVERFLIGHT ANGLE  (DEGREES):    Directly overhead

NEIGHBORHOOD:   Old, close packed residential, sing family dwellings
                                                           *
NEIGHBORHOOD NOISE  (DBA):  58 (63 peak)

TIME PERIOD (MIN.):   11:31 - 12:14 P.M. (43)

AVG. TIME BETWEEN OVERFLIGHTS (MIN.):    2.1
AIRCRAFT TYPE
NO.
     PEAK NOISE (DBA)
HIGH         AVG.
                                                              LOW
727/737/DC-9
707/DC-8/STRETCH
L1011/DC-10
NON-TURBO PROP
ALL TYPES
11
3
1
5
20
88
88

71
88
79
88
82
69.2
78.1
74


67
69
COMMENTS:  At 5724 North Oleander, resident stated that the planes
           fly lower and louder more on some days than others.  She
           stated that the noise levels the Environmental Protection
           Agency measured were lower than normal.  For her, the
           greatest annoyance is between 4:00 P.M. and 9:00 P.M.

           She has felt no relief since the introduction of the DC-10
           and^ L-1011 because large numbers of 707's still pass over-
           head.

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#12    LOCATION:   10217 McNerney Drive,  Franklin  Park,  Illinois
                   (Near Mannheim and the Tri-State)

       DATE:    August 28,  1972

       WEATHER:    Clear sky,  85  degrees,  wind N.W. at 5 mph

       RUNWAY STUDIED:    32L, Landings
       DISTANCE TO RUNWAY END (MILES):    1>8

       OVERFLIGHT ANGLE  (DEGREES):    Overhead

       NEIGHBORHOOD:   Small homes, very  closely packed

       NEIGHBORHOOD NOISE (DBA):

       TIME PERIOD (MIN.):   12:45 - 1:45 P.M. (60)
       AVG. TIME BETWEEN OVERFLIGHTS (MIN.):   2
       AIRCRAFT TYPE
NO.
      PEAK NOISE  (DBA)
 HIGH         AVG.
                                                                    LOW
      727/737/DC-9
      707/DC-8/STRETCH
      TURBO PROP
      NON-TURBO PROP
21
 4
 1
 4
 97
105

 81
94.4
100.5
88
78.2
91
97

75
      ALL TYPES
31
105
93
75
      COMMENTS:    NONE

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                                                 ( "
 LOCATION:   West Greenvalley and North Spruce, Bensenville,  Illinois
            (2 blocks North of Rou-tes 19 and 83)

 DATE:    August 28, 1972
 WEATHER:   Partly cloudy, 88 degrees, wind N. W. at 7 mph
 RUNWAY STUDIED:   9R,  Takeoff
 DISTANCE  TO RUNWAY END (MILES):   2.02
 OVERFLIGHT ANGLE (DEGREES):    80 -  85 degrees, Left
 NEIGHBORHOOD:   Single family, suburban residential
                                                            *
 NEIGHBORHOOD NOISE (DBA):
 TIME PERIOD (MIN.):    1:13 - 1:26 P.M. (13)
 AVG. TIME BETWEEN OVERFLIGHTS (MIN.):   2.1
 AIRCRAFT TYPE
NO.
     PEAK NOISE (DBA)
HIGH         AVG.
                                                              LOW
727/737/DC-9
707/DC-8/STRETCH
 5
 1
96
90.4
103
87
ALL TYPES
             103
             92.5
            87
COMMENTS:    NONE

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#14
LOCATION:   Addison and Irving Park, Woodale, Illinois
DATE:       August 28, 1972

WEATHER:    Partly cloudy, 88 degrees, wind N.W.  8 mph

RUNWAY STUDIED:   9R,  Takeoff

DISTANCE TO RUNWAY END  (MILES):    3.57

OVERFLIGHT ANGLE  (DEGREES):    75 - 90 degrees,  Right

NEIGHBORHOOD:   Vacant land to the North;  old,  suburban residential
                to the South
NEIGHBORHOOD NOISE (DBA):

TIME PERIOD (MIN.):     1:35 - 1:58 P.M.  (23)

AVG. TIME BETWEEN OVERFLIGHTS (MIN.):  3.8
AIRCRAFT TYPE
                              NO.
     PEAK NOISE (DBA)
HIGH         AVG.
                                                              LOW
727/737/DC-9
707/DC-8/STRETCH
ALL TYPES
I
2
3
95
95
87
92
90.3
89
87
COMMENTS:   3 of the 6 planes observed veered to 30 -  45 degrees,  right.
            The average peak noise for these planes was  78.3 DBA.
            A large quantity of undeveloped land lies  North of Irving
            Park Road to Thorndale Avenue.

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#15    LOCATION:   16 West 164th Foster,  Woodale,  Illinois
                  (West of Route 83 between Irving Park and  Thorndale)


       DATE:     August 28, 1972

       WEATHER:    Partly cloudy, 88 degrees,  wind  N.W.  at  8  mph

       RUNWAY  STUDIED:    9R,   Takeoff

       DISTANCE  TO RUNWAY END  (MILES):    2.17

       OVERFLIGHT  ANGLE (DEGREES):    75  - 85  degrees, Right

       NEIGHBORHOOD:   Suburban, single family residential; there  is  a large
                      cornfield N.  W. of the  above location
       NEIGHBORHOOD NOISE (DBA):

       TIME  PERIOD (MIN.):   2:20 - 2:38 P.M. (18)
       AVG.  TIME BETWEEN OVERFLIGHTS (MIN.):       3
      AIRCRAFT  TYPE           NO.                PEAK NOISE (DBA)
                                           HIGH         AVG.         LOW
727/737/DC-9
ALL TYPES
2
2
Same
95 89.5

84
      COMMENTS:   The  average  of  3 other aircraft veering at 30 - 45 degrees,
                 Right was  74.6  DBA  for 727's.
                The resident at the above location complained of severe
                annoyance, especially from 3:00 - 5:00 P.M. and in the middle
                of his  sleep.  He also stated that landings were louder than
                takeoffs and the above data represents a quiet day for him.

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