United States Region 8
Environmental Protection 1860 Lincoln Street
Agency Denver, CO 80295
February 1980
EPA 908/1-79-002 A
An Aerial Noise
Monitoring Study
Vol.1
Technical Dissertation
-------
EPA-908/1-79-002A
AN AERIAL NOISE MONITORING STUDY
VOLUME I
TECHNICAL DISSERTATION
by
R. C. Ghanaud
H. N. McGregor
Engineering Dynamics, Inc.
Denver, Colorado 80211
68-01-3500
Project Officer
Robert A. Simmons
Noise Control Section
U. S. Environmental Protection Agency,
Region VIII
Denver, Colorado 80295
Air and Hazardous Materials Division
Region VIII
U. S. Environmental Protection Agency
Denver, Colorado 80295
-------
DISCLAIMER
This report has been reviewed by the Air and Hazardous Ma-
terials Division, Region VIII, of the U. S. Environmental Pro-
tection Agency, and approved for publication. Approval does not
signify that the contents necessarily reflect the views and pol-
icies of the U. S. Environmental Protection Agency, nor does men-
tion of trade names or commercial products constitute endorsement
or recommendation for use.
DISTRIBUTION STATEMENT
This document is available to the public through the Na-
tional Technical Information Service, Springfield, Virginia,
22161.
-------
FOREWORD
This report describes pioneering efforts in the development of hardware,
techniques, and methods that have been used to measure noise levels above a
community by means of an instrument suspended under a tethered balloon. The
described developments go a long way toward proving the applicability of
concepts that were first proposed in this Directorate. A suitable foundation
now exists upon which aerial noise monitoring should be further proven in a
real-world environmental noise study, during which, and before additional
instrument packages are fabricated, the need for further refinements should be
studied.
Robert L. Dupreyf Director
Air & Hazardous Mate/fals Division
Region VIII
United States Environmental Protection
Agency
m
-------
CONTENTS
Section 1: Introduction 1
Section 2: Conclusions 3
Section 3: Recommendations 4
Section 4: System Description 5
Physical Description of Telemetry Package 5
Electrical and Electro-Acoustic Circuitry Description 7
Moored Balloon System 20
Section 5: System Performance and Performance Tests 24
Performance Specifications 24
Performance Tests 28
Section 6: Aerial Monitoring Tests 51
Site Selection 51
Measurement Results 52
Section 7: Technical Discussion 164
Optimum Altitude 164
Acoustic Power of Boulder 165
-------
ACKNOWLEDGMENTS
Projects involving the interfacing of technology, regulations,
and community support are successful because of the efforts of
many individuals. Credits are given to: J. V. Adams, Environmental
Protection Officer for the City of Boulder, Colorado, for his
support of flight operations and evaluation of the field equip-
ment; E.E. McKenna of the University of Colorado for the fabri-
cation and testing of the early prototype aerial system; W. Bryan
of the U. S. EPA, Region VIII, for his technical review of the
electronic designs and assistance in the preparation of this re-
port; S. Rossi of Engineering Dynamics, Inc. for the construction
and testing of the final flight system; J. Ruth of Engineering
Dyanmics, Inc., for site selection and data analysis.
-------
SECTION 1
INTRODUCTION
This project is directed towards filling a gap in informa-
tion that is required to fulfill some of the mandates of the
Noise Control Act of 1972. Present environmental noise monitoring
schemes in communities are adaptions of monitoring schemes
developed specifically for measuring specific noise sources. For
example, airports and highways have been monitored and prediction
schemes for them have been developed. Thus, an acoustic measure-
ment at a known point can provide a basic input to the prediction
scheme which can then be used to predict noise levels at many
other points. The measure we most commonly refer to is the ac-
quisition of cumulative distrubutions of the A weighted sound
pressure level at a number of ground stations whose locations
have been judiciously chosen. When the method is transferred to
general community monitoring where there is a multitude of noise
sources the criterion for monitoring station locations is lost,
i.e., the relationship between station and receiver is much less
deterministic than it was between station and noise source.
To overcome the problem, a large increase in monitoring
stations is required to achieve a degree of statistical validity.
Even if this is done, the objectives of getting valid measures
of the intensity and extensity of the noise in an entire commun-
ity, and finding the environmental noise exposure of people, can-
not be accomplished with any degree of accuracy. In essence, pres-
ent monitoring schemes are not adequate to measure the noise
exposure to humans, and imprecise extrapolations must be made to
achieve the above objectives when relating to the residents of the
community. However, little work has been done to develop a more
discriminating monitoring method.
In an effort to achieve these objectives a program has been
initiated by the U. S. EPA to develop an aerial sound monitoring
system. Earlier experiences by the U. S. EPA, Region VIII in 1975
showed the concept to be not only feasible but technically practical
with state-of-the-art electronics. A moored balloon was flown
and acoustic data were
-------
transmitted to a ground station. As a result of these explora-
tory tests a more formal aerial monitoring system deveopment
program was initiated by Engineering Dynamics, Inc., under a
contract to Region VIII of the EPA.
The purpose of the program -was to determine if the aerial
monitoring concept could be developed into a hardware package
that could be used by communities to determine the existing
noise environment and to measure the improvement in the environ-
ment with time. Because the program was exploratory there were
many unknowns that were dicovered during the course of the
program. The impact of these unknowns is discussed herein.
Volume I of this report discusses the design, performance
and flight test results of the program. Volume II is an operations
handbook to be used by community noise control personnel in the
operation and application of the aerial package and ground
station.
-------
SECTION 2
CONCLUSIONS
An aerial noise monitoring system can be developed that
can accurately measure the noise radiating from a community
below. The system can be flown successfully to altitudes of
914 m. At 914 m. the atmospheric absorption is significant and the
A weighted sound pressure levels can be as much as 5 dB low,
depending on relative humidity.
The exploratory tests conducted over the City of Buulder,
Colorado, indicate that the optimum altitude is about 275 m.
Below 60 m. the effects of shielding (acoustical screening) due
to trees and buildings affect (usually by lowering) the A
weighted levels. This altitude can vary from site to site and
must be determined for each site if low altitude (levels below
100 m.) measurements are to be taken.
The project revealed many factors which must be taken into
consideration that are constraints. Persons planning to conduct
an aerial monitoring program must recognize that delays or
interruptions will occur due to adverse weather, obtaining
clearances from the FAA when flying near airports, obtaining a
permit from the FCC to use the 400 MHz telemetry band, and
acoustic artifacts which can negate data collected over several
days.
The aerial systems can be operated by communities provided
the personnel completely understand the instructions in the
handbook (Volume II) and have a working knowledge of acoustic
measurements.
The electroacoustic performance of the aerial system de-
veloped under this contract will meet the requirements set forth
by ANSI for a Type II Sound Level Meter.
-------
SECTION 3
RECOMMENDATIONS
A program should be established to allow at least 10 com-
munities to operate the aerial monitoring system for a period of
one month. This program should be accomplished with the equip-
ment developed as part of this contract.
The balloon should be flown at an elevation of 275 m. when-
ever that is possible within limitations established by the F.A.
A. or other local, state or governmental agencies.
The mooring line to the balloon must have a load rating of
at least 130 kg. The 45 kg. test line used for the exploratory
tests was marginal under adverse weather conditions.
If the system is to be used on a regular basis or if more
systems are to be fabricated a telemetry controlled destruct sys-
tem must be incorporated to avoid the loss of the aerial package
in the event the mooring line breaks.
The existing telemetry receiver is too complex and should
be replaced with one having crystal frequency controls and a
minimum of controls.
-------
SECTION 4
SYSTEM DESCRIPTION
PHYSICAL DESCRIPTION OF TELEMETRY PACKAGE
The acoustic telemetry package consists of a mainframe
structure which supports the electronic circuitry, battery pack,
microphone/preamp, transmitter, and windscreen. The mainframe is
machined from a square 5.08 cm. x 5.08 cm., 0.32 cm wall thick-
ness, aluminum extrusion. The 400 MHz FM transmitter is attached
to the main printed circuit board assembly and the transmitter
and circuit board are in turn fastened to the mainframe structure.
Two 11 volt size batteries are housed in the rear section of the
mainframe. Access to the battery compartment is obtained by remov-
ing the backplate which is fastened to the mainframe by 2 air-
loc fasteners. The backplate serves as the interface between the
telemetry package and the suspension lines from the balloon.
Attached to the side of the mainframe is the dipole antenna.
There is one control on the package, a dB range switch. The
dB range switch allows the operator to select full scale sound
pressure levels of 120, 100, 80, and 60 dB(A). The mainframe is
covered with a thin 0.04 cm. thick aluminum sheet for protection
from the elements and for electrostatic shielding of the low
level electronic circuitry.
Weight of the system is as follows:
Mainframe Assembly 0.5 kg
Microphone 0.1 kg
Preamplifier 0.085 kg
Batteries 0.6 kg
Windscreen 0.2 kg
Total Package Weight 1.48 kg
This total package weight is less than the 2 kg specifica-
tion. A second aerial package has been provided as part of the
contract and is identical to the first unit described herein.
-------
CD
CD
CD
a
i.
o"
Go
o
Microphone
Amplifier
Transmitter
Preamplifier
\
Modulator
\
Antenna
A Network
Output
BLOCK DIAGRAM OF ACOUSTIC TELEMETRY PACKAGE
Figure I
-------
ELECTRICAL AND ELECTRO-ACOUSTIC CIRCUITRY DESCRIPTION
General Description
The audio signal (see Figure 1) is transduced by the micro-
phone and the electrical signal from the microphone is fed via
a preamp and attenuator to a voltage controlled oscillator having
a center frequency of 80 KHz. The FM signal is fed to a 400 MHz
FM transmitter and the RF signal is transmitted to the ground
receiver. The receiver converts the 400 MHz signal to the 80 KHz
FM subcarrier, and the FM subaarrier is fed to a demodulator
circuit and then to weighting circuits which provide A and C
weighted outputs for tape recorders, level recorders or sound
level meters.
Microphone
The microphone is a 2.37 cm. diameter ceramic microphone
(GenRad Model 1961) having a nominal sensitivity of -40dB re 1
V/N/m and a temperature coefficient of about 0.001 dB/deg. C.
Source impedance of the microphone is equivalent to 385 pf. with a
temperature coefficient of 2.2 pf/deg. C. The microphone will
operate normally up to 100% RH, which is an important considera-
tion for an aerial monitoring system. Although an equivalent size
and sensitivity electret type microphone would have better
frequency response, it would not function above 90% RH. Frequency
response of the microphone (open voltage) is better than +^ 1 dB
from 20 to 2 KHz, +. 4 dB to 5 KHz, and ± 6 dB at 10 KHz. Weight
of the microphone is 0.1 kg.
Preamplifier Circuit
The input signal from the microphone (see Figure 2) is fed
through C]_ to the gate of Qj_. A signal is taken from the source
of Q]_ and drives the shield ring at the microphone connector.
Q2 is driven from the drain of Qj_ for stabilization purposes.
The output source impedance of the preamplifier (GenRad Model
1933-4795) is about 20 ohms and the imput impedance is greater
than 100 MOhms. Weight of the preamplifier is 0.085 kg.
Audio Amplifier and Attenuator Circuit
The electrical signal from the preamplifier (see Figure 3 )
is fed to the amplifier Q±. Feedback resistors of Q]_ are switched
to set gain for full scale sound pressure levels of 120, 100, 80,
-------
CD
CD
CD
a
Q
O"
co
O
PREAMPLIFIER CIRCUIT
GND
SHIELD
Figure 2
-------
Preamplifier Circuit Component List
Capacitors:
C3
Resistors:
R3
R
Ceramic .001 uf +_ 10% 100 VDC
Tantalum 6.800 uf +_ 20% 15 VDC
Tantalum 10.00 uf +_ 20% 30 VDC
comp.
comp.
comp.
comp.
comp.
comp.
comp.
comp.
Transistors:
2.2 G ohms :
100.0 K ohms :
75.0 K ohms :
3 .0 K ohms.-
4.7 K ohms :
100.0 K ohms :
3.0 K ohms
2.2 K ohms
20% 1/8
5% 1/3
5% 1/8
5% 1/3
5% 1/3
5% 1/3
5% 1/8
5% 1/8
Q2
Special
Type D30A3
watt
watt
watt
watt
watt
watt
watt
watt
-------
CD
D
CD
CD
(Q
a
Q
o
CO
O
V
AUDIO AMPLIFIER AND ATTENUATOR CIRCUIT
Ih—
Figure 3
-------
Audio Amplifier and Attenuator Circuit Component List
Capacitors:
cl
C3
C4
C5
Resistors :
Rl
R2
R3
R4
R5
R6
R7
R8
R9
R10
Rll
Rl2
R13
R14
Ceramic
Ceramic
Film
Tantalum 10
Tantalum 10
Mica 50
Film
Comp.
Metal film
Metal film
Metal film
Metal film
Comp.
Comp.
Comp.
Comp.
Comp.
Comp.
Comp.
Comp.
Comp .
.0005
.005
.82
.00
.00
.00
.10
1.
15.
1.
150.
15.
100.
100.
6.
8.
100.
100.
100.
6.
1.
uf
uf
uf
uf
uf
pf
uf
0
0
5
0
0
0
0
2
2
0
0
0
2
0
K
K
K
K
K
K
K
K
K
K
K
K
K
K
± 10%
+. 10%
+ 20%
± 20%
+_ 20%
+ 20%
+ 20%
ohm +_
ohm j+
ohm +_
ohm +_
ohm +_
ohm +_
ohm +_
ohm +_
ohm _+
ohm _+
ohm +_
ohm +_
ohm +_
ohm +_
25 VDC
25 VDC
5%
1%
1%
1%
1%
5%
5%
5%
5%
5%
5%
5%
5%
5%
k
k
k
h
h
h
h
h
h
%
h
h
h
h
watt
watt
watt
watt
watt
watt
watt
watt
watt
watt
watt
watt
watt
watt
Integrated Circuits:
Q-L Type LM124A
Q2 Type LM124A
Qo Type LM124A
11
-------
and 60 dB(A). The coupling circuit between Q]_ and Q2 functions
as a high pass filter with a 3 dB point at 250 Hz. This high pass
filter results in the circuit having a B weighted frequency
response. (Refer to Figure 3 ) . Q2 is a fixed gain amplifier and
drives the output buffer source follower Q-^. All items in this
section were made by Engineering Dynamics, Inc.
Modulator Circuit
The B weighted signal from 03 (see Figure 4) of the audio
amplifier is fed to Q]_ of the modulator circuit.
The modulator operates at a quiescent frequency of 80 KHz
and is frequency modulated _+ 20% by full scale signals of 120,
100, 80, or 60 dB(A) as controlled by the range switch. This 80
KHz subcarrier was used to modulate the 400 MHz carrier. By using
the subcarrier technique both signal to noise ratio and the low
frequency response of the system are improved.
FM Transmitter
The design details of the FM transmitter circuit (SCI Sys-
tem Inc. Model TMET-400-FM) are proprietary to the manufacturer
and therefore cannot be replicated in this document. However,
the manufacturer's published specifications are as follows:
Weight 0.047 kg
Frequency range 391 to 405 MHz
Residual FM 750 Hz PK
Output power 10 mw
Input current 21 ma
Modulation voltage 62 mv rms at 100 KHz peak Dev.
The output of the transmitter is fed to a dipole antenna.
Now, if we have an 80 KHz subcarrier and 750 Hz residual
on the carrier then the subcarrier will have a residual of about
1 Hz, as a result of the heterodyning process. Full scale sound
pressure level on any range is 20% deviation of 80 KHz, or 16 KHz,
and a 1 Hz residual is equivalent to a noise floor of -84 dB from
full scale, much lower than we can expect from the audio system
which will be discussed later on in this document.
Telemetry Receiver
Detailed schematics of the telemetry receiver (Microdyne
12
-------
CD
(Q
IT
CD
CD
S
a
^,.
Q
n
CO
I)
V
Q-
R/
V
MODULATOR CIRCUIT
Figure 4
-------
Modulator Circuit Component List
Capacitors:
cl
C2
c,
Film
Mica
Ceramic
0.
220.
0.
100
000
001
uf
pf
uf
+_
+
+
20%
20%
20%
Resistors :
Rj_ Comp. 740 ohm ± 5% h watt
R2 Comp. 680 ohm +_ 5% % watt
R^ Comp. Adjusted for modulation frequency
R4 Comp. 100 K ohm +. 5% % watt
R5 Comp. 600 K ohm ± 5% % watt
Integrated Circuit:
Q Type 2M566 VCO
14
-------
Model 1IOO-AR with RF Tuner Model 113-T(A) are considered trade
secrets by the manufacturer and therefore cannot be replicated in
this document. Performance specification of the receiver are pub-
lished data with no restrictions and are as follows:
Receiver type Double superheterodyne, 50 MHz
first IF, 10 MHz second IF.
Frequency range 285 to 410 MHz
Noise figure 7.5 dB maximum
Image rejection 80 dB
IF Rejection 90 dB
Tracking range ± 400 KHz; +. 250 KHz fine tune control
Weight 20 kg
Demodulator
The 80 KHz subcarrier from the receiver (see Figure 5) is
fed to the phase lock loop demodulator, Q1/ and the variable
phase signal is fed to the phase-adder circuit and output filter,
Q2- The audio output from Q2 is fed through a 20 KHz low pass
filter for additional suppression of the 80 KHz carrier.
The output from the 20 KHz filter is a B weighting of the
acoustic signal transduced by the microphone.
Weighting Circuit
The B weighted data signal is fed to a circuit ( see Figure
6) which is an inverse of the B weighting network, thus giving a
C weighting output. The C weighting output is then fed to an A
weighting circuit which is then fed to a graphic level recorder
for analysis.
15
-------
DEMODULATOR
Figure 5
-------
Demodulator Circuit Component List
Capacitors:
C, Film
C2 Ceramic
Co Ceramic
C^ Ceramic
C5 Film
C6 Film
.010
.001
.002
.001
.120
.100
uf +_ 20%
uf +_ 20%
uf +_ 20%
uf + 20%
uf i 20%
uf + 20%
Resistors:
Comp
K ohm HH 5% k watt
R-
R5
Rg
R7
Comp. 1 K ohm _+ 5% % watt
Comp. 4.7 K ohm +. 5% % watt
Comp. 47.0 K ohm +_ 5% h watt
Comp. 47.0 K ohm ± 5% k watt
Comp. 470.0 K ohm +. 5% k watt
Comp. 550.0 K ohm ± 5% % watt
Potentiometers:
P-L Comp. 10 K ohm ± 5% % watt
?2 Comp. 100 K ohm ± 5% k watt
Integrated Circuits:
Ql TYPe LM565 P.L.L.
Q2 Type LM 307
Filter:
F]_ 20 KHz lowpass filter
17
-------
(D
o
"4
A/W
0
0
Q.
Q
O
CO
D'
O
R
-O C Output
V
WEIGHTING CIRCUITS
A Output
Figure 6
-------
Weighting Circuit Component List
Capacitors :
C]_ Film .67 uf +_ 20%
C2 Film .27 uf +_ 20%
C3 Film .1 uf +_ 20%
C4 Film .02 uf +_ 20%
C5 Ceramic .0013 uf +_ 20%
C6 Ceramic 250 uf +_ 20%
Resistors:
R1 Comp. 10.0 K ohm +_ 5%
R2 Comp . 4 . 9 K ohm + 5%
R3 Comp. 10.0 K ohm +_ 5%
R4 Comp. 50.0 K ohm +_ 5%
R5 Comp. 5.0 K ohm ± 5%
R6 Comp. 50.0 K ohm ± 5%
R7 Film 13.3 K ohm +. 1%
R8 Film 51.1 K ohm +. 1%
Rg Comp. 10.0 K ohm _+ 5%
Film 13.3 K ohm +. 1%
Film 13.3 K ohm + 1%
Integrated Circuits:
Type LM307
Q2 Type LM307
Q3 Type LM307
Q4 Type LM307
Q5 Type LM307
Q6 Type LM307
19
-------
MOORED BALLOON SYSTEM
Balloon
The balloon is an expendable item because it is fabricated
of thin plastic film and can be punctured very easily. Experience
has shown that the balloon is good for about 2 weeks of normal
usage. The balloon is 4,9 m. in length and 1.4 m. in diameter,
weighs 1.7 kg., and has a nominal volume of 3.25 nr. As the balloon
rises the helium expands and the volume of the balloon increases.
This expansion partially affects the loss of lift with altitude.
The aerial package balloon when filled in accordance with
the a-anuf acturer' s instructions will have a volume of 3.257 cubic
meters. The buoyancy of the balloon is the difference in density
between the gas in the balloon and the surrounding atmosphere.
At sea level and 15°C the atmospheric density is 1.225 kg/m3
(Standard Atmosphere Table, NASA Report 1235). At 0°C the density
is 1.2927 kg/m3. The density of helium at these same conditions
is 0.1784 kg/m3. For a helium filled balloon of 3.257 cubic meters
the buoyancy is determined by the following equation derived by
Morris, et al, in the Bulletin of the American Meteorological
Society, Vol. 56, No. 9 Sept., 1975:
B = (1.056) Vb exp (-9.8 x 10~5Z)
Opposing the buoyancy of the balloon is the weight of the
balloon, its rigging, and the aerial monitoring package, which
equals 2.72 kg. A variable load is the tether line, whose weight
is proportional to the altitude and is .0005 kg. per meter, as
used in this study.
Using these factors the lift of the balloon under no-wind
conditions is:
L = (1.056)Vb exp (-9.8 x 1Q-5Z)
SO:
L = (3.44) exp(-9.8 x 10~5Z)
The following table shows the lift of the aerial monitoring
system when flying in the standard atmosphere:
20
-------
Altitude Lift Load
Z (kg)
(meters, MSL)
0 3.44 -2.72
100 3.41 -2.77
200 3.37 -2.82
300 3.34 -2.87
400 3.31 -2.92
500 3.28 -2.97
600 3.24 -3.02
700 3.21 -3.07
800 3.18 -3.12
900 3.15 -3.17
1000 3.12 -3.22
The above table shows that under no-wind conditions the
balloon with the aerial package can be flown to about 1000 meters.
Aerodynamic lift can be obtained from the wind and the balloon
can be flown at heights greater than 1000 meters. Flights as high
as 2000 meters have been achieved by others.
Balloon Rigging
The balloon is rigged via 4 tie points, two located at
the bottom front and two at the bottom midrear (see Figure 7).
The rigging is 45 kg. test nylon cord. Two bridles are formed from
the tie points; one for all mooring line, and one to support the
aerial package.
Mooring Line
The balloon was moored via a 45 kg. test monofilament fish
line, which was attached to an electrically driven winch.
Site Elevation
The above table which shows the balloon lift and load as a
function of altitude was computed with the balloon starting at sea-
level. When the balloon is launched from higher elevations the
term in parenthesis (1,056) of the lift equation reduces slightly.
Flights as high as 800 meters have been accomplished near Boulder,
Colorado.
21
-------
8*10°
K)
TETHER LINE
JSUPPORT LINES
-ADAPTER BASE PLATE
-TELEMETRY PACKAGE
-WINDSCREEN
Figure 7
-------
Winch
An electrically operated winch was constructed for reeling
in and out the balloon line. The winch operates from a 12 volt
battery that allows operation from a vehicle. The winch is
equipped with a Simmons safety switch which automatically stops
the mechanism if the balloon rigging contacts the winch. Without
the safety switch the balloon bridle lines could be drawn into
the winch.
The power drain increases as a direct function of the lift
of the balloon. Under normal operating conditions (i.e., still
flight) power consumption is approximately 12 watts. Winch speed
is non-uniform and is a function of the aerodynamic lift on the
balloon. Reeling in the balloon is approximately twice as fast
as reeling out the balloon under equal load conditions.
23
-------
SECTION 5
SYSTEM PERFORMANCE AND PERFORMANCE TESTS
PERFORMANCE SPECIFICATIONS
The following performance specifications were required to
be met as fulfillment of the contract under which this project
was conducted. The specifications are replicated below and fol-
lowing them is a description of the tests conducted to verify
that the system met the performance specifications.
The total weight of the instrument package will be less
than two kilograms.
It shall be possible to manufacture the instrument at a cost
of less than 800.00 dollars, excluding the transmitter.
The usable temperature range of the instrument package shall
be from minus five (5) degrees centigrade to fifty (50) degrees
centigrade with intermittent calibration of the equipment allowed.
The accuracy specified below must be maintained with temper-
ature variations of plus or minus 10 degrees centigrade without
recalibration of the aerial package.
The Contractor shall provide a microphone wind screen which
will optimize the trade-off between flyability and minimization
of wind-induced noise. (See (5) below under Performance Criteria).
The system must be easy to operate by individuals possessing
the expertise typical of Region VIII community noise control
personnel.
The instrument package must be capable of demonstrating on
the ground a performance level which satisfies the performance
criteria listed below, with instrument package FM receiver sep-
arations throughout the range from 6.1 meters to 152 meters.
24
-------
Performance Criteria
(1) Signal to noise ratio: greater than 40 dB.
(2) Measurement range: 30 dB(A) to 120 dB (A).
(3) D namic range: 40 dB.
(4) Accuracy: +. 0.5 dB(A).
(5) Wind tolerance: such that the trade off between the
flyability of the balloon and the minimization of wind
induced noise is optimized.
(6) Quality of analog data collected: must be sufficient
to allow source identification, audio demonstration,
and digital analysis of the data and otherwise satisfy
the following criteria:
(a) total harmonic distortion of less than 2% at
full scale.
(b) frequency response within tolerances of ANSI'
Type 2 Standards.
(c) Signal to noise ratio greater than 40 dB.
The Contractor shall construct one (1) aerial instrument
package capable of satisfying the design and performance criteria
specified herein.
The Contractor shall demonstrate and document to the sat-
isfaction of the Project Officer that the above design and per-
formance criteria are satisfied by the instrumentation system
with appropriate experiments conducted on the ground.
The Contractor shall demonstrate satisfactory performance
of the aerial package to the Project Officer as it is flown and
operated at a location which is acoustically representative of
community noise in Region VIII throughout the range of altitudes
varying from 6.1 meters to 152 meters above the ground. Satisfac-
tory performance has been demonstrated when the following perfor-
mance criteria have been met:
(1) The aerial instrument package and receiving accoutre-
ments must be durable enough to withstand general
handling without significant performance loss as specified
below:
(a) signal to noise ratio: greater than 40 dB.
(b) accuracy: +_ I dB; may be demonstrated with calcula-
ted noise levels resulting from ground sources.
The Contractor shall develop a proposed aerial monitoring
25
-------
methodology and present this information to the Project Officer.
The Contractor shall choose and identify several sites
that collectively are representative of the sound generated by
Boulder, Colorado, during a typical weekday.
The Contractor shall conduct aerial monitoring in Boulder,
Colorado, at as many of the sites identified under Task 1 as can
be monitored in compliance with the then-existing regulations of
the Federal Aviation Administration (FAA). This monitoring shall
be between the effective date of this Modification No. 1 and
April 15, 1978, and shall be of sufficient duration to charac-
terize the noise environment during the entire period from sun-
rise to sunset at each site.
If the aerial package do-es not operate because the batteries
fail to operate due to low temperature the measurement lost dur-
ing any day shall be repeated by the Contractor. Monitoring shall
be in compliance with FAA Regulation 101. Data gathered shall
satisfy the design and performance criteria specified in Phases
I and II. Representative analog data of 1 1/2 hour duration shall
be taken at each site.
The Contractor shall analyze results, computing for the time
periods monitored, cumulative statistics, associated standard
deviation, Ln and Leg. Analysis of these data shall be demonstra-
ted making use of chart recorders and also environmental noise
classifiers. An approximation of the total sound power produced
by sections of Boulder, Colorado, during a representative weekday
should be made. Results shall be submitted to the Project Officer,
The Contractor shall conduct aerial monitoring at selected
locations in Boulder, Colorado, at a period of time between May
1 and September 20, 1978. Results shall be analyzed, computing
for the time periods monitored, cumulative statistices, associa-
ted standard deviation, L^ and Lecf. Analysis of these data shall
be demonstrated making use of chart recorders and also environ-
mental noise classifiers. An approximation of the total sound
power produced by sections of Boulder, Colorado, during a repre-
sentative weekday should be made. Results shall be submitted to
the Project Officer.
The Contractor shall fabricate a second aerial instrument
package which satisfies the design and performance criteria that
are specified herein for the first aerial instrument package.
26
-------
This requirement is contingent upon the provision by the Govern-
ment, at Government expense, of a second transmitter that is
physically and electrically compatible with other components i-
dentical to those in the first aerial instrument package.
27
-------
PERFORMANCE TESTS
Frequency Response and Dynamic Range
End to end system frequency response and dynamic range was
measured by replacing the microphone with an equivalent voltage
source. This voltage source level was adjusted to be equal to
the microphone open circuit voltage at 120, 100, 80, and 60 dB
at 1000 Hz. This input voltage was held constant and the fre-
quency was set to the octave band center frequencies from 20 to
10 KHz. System output was measured at the weighting networks of
the telemetry ground station. Thus, these tests include any ef-
fects of the RF link. The noise floor was measured with the in-
put grounded and the noise floor measured in octave bands, flat
and A weighting. Figures 8 through 11 show the measured data for
each full scale sound pressure level range. One additional data
point is shown on these figures which is the level above full
scale at which the sine wave input becomes distorted when viewed
on an oscilloscope. This point is a measure of the crest factor
when the input signal is random in nature.
A summary of the results for each full scale sound pressure
level range follows:
(1) 120 dB Range
a. Crest Factor - 11 dB
b. C weighting - Type II
c. A weighting - Type II
d. C weighting Noise Floor - 35 dB
e. A weighting Noise Floor - 36 dB
(2)100 dB Range
a. Crest Factor - 14 dB
b. C weighting - Type II
c. A weighting - Type II
d. C weighting Noise Floor - 34 dB
e. A weighting Noise Floor - 36 dB
(3) 80 dB Range
a. Crest Factor - 13.5 dB
b. C weighting - Type II
c. A weighting - Type II
d. C weighting Noise Floor - 26 dB
e. A weighting Noise Floor - 33 dB
(4) 60 dB Range
a. Crest Factor - 12 dB
28
-------
(120)+1n
c
CD
13 -10
(D «
x"T\ Hn
^' ^
^H "
(LJ w
w >H 90
a *3
Cn
Qo
-H
T3
.CO
O
-40
sn
1
(
:
'-
(-
*-
—
/
-
AERIAL MONITORING SYSTEM
B Clipping Level /\
C Weighted
Use Left Scale
i
•-.'-
/
x
.x-
/
/:
./•
\
-
A
t
s
/--
/
- /
: :
- -
-
- /
/ .
- -
• -
/
/
/
s
f
\
/
: s
/
_
-
;
• ;
- -
^
s*
~
-
~s
_
-
-
_— -
.
• -
- -
>
x<
^^^r
- -
t.
<
__<
UCi
s— —
— =<
^—
• m.
A Weighted
Use Left Scale
. t
1^
Z-
.
— i
i
r'
C
U
i^_
!"*-:
- -
x-
Z".
r~—
t •"
U ,., J
[^te
- *"*-
^
f
_^*"^
•*.
' <**
• *
Weighted
se Right Scale
A Weighted Noise J
C Weighted Noise }
Use Left Scale
^
^^
"^
N
**
H
V
- -
—
• -
- -
- -
:1 t t t :
?loor
?loor
-30
H-
01
(D
-40 ^
0
0
h O
a s;
W (D
~5° m^
H rt
O (D
£ DJ
H
H
-60 cn
0
(ii
H
(D
-70
-80
35 63 125 250 500 1000 2K 4K 8K I6K
FREQ-Hz
END TO END
SYSTEM FREQUENCY RESPONSE
NOISE FLOOR AND CREST FACTOR 120 dB(A) RANGE Figure 8
-------
(ioo)+lc
c
(D
^
|
•J
^ '
- -
C Weighted
Use Right Scale
rTTTFO'J
A Weighted Noise
C Weighted Noise
Use Left Scale
^
b-<
i.
>-N^
V
\
• -
-
-
—
- -
• -
- -
Floor
Floor
-
31.5 63 125 250 500 1000 2K 4K 8K I6K
FREQ-Hz
END TO END
SYSTEM FREQUENCY RESPONSE,
NOISE FLOOR AND CREST FACTOR 100 dB(A) RANGE Figu
§
H-
(0
(D
-40 ^
H
I
n
a
W|
W H-
_50 (0 ^
H tf
9 rf
s: m
a
"^
c
H
M
W
n
pi
H
(D
7O
-80
re 9
-------
AERIAL MONITORING SYSTEM
• Clipping level
(80) A
c
0
D
(Q.
— ^ i— i
-1C
(D »
0
.ix o)
— ^ r-\
) nj
^ H -2(1
a- 3
-<^ PM
3 1
— ^ Q)
-3 a
-30
T=X- m
( ) 'O
.CO
0
-40
-50
"/
/
-\
- -
- ~
- /
/:
~
(
-
- t
f
C Weighted
Use Left Scale
""^
4
-/-
/
/
/
r —
— «^—
—Ji
/
y '
/
/ •
^
- /
/
y
f
/
r" ^
-^ _
- /
-/ -
- .-»
,,-i
_
'/ •
/
s
~ /
/ .
/
•— <
^
' /
• -
• -
J
-
S
/
k
~~/L
: i
~~#L
Y:
- -
t
. /-
.
^
'•
Us
,- -
X
We
e
i
^*.
igh
Lef
f-
r2
^
|
^
te
t
P~
^-— :
.
S-
-
!^:
- s-
•
C Weighted
Use Right Scale
><
. i
1*^
-s1 -
\. 3
- ^
f X
\:
• -
- -
—
• -
-
i i i i i i i
A Weighted Noise Floor
C Weighted Noise Floor
Use Left Scale
31.5 63 125 250 500 1000 2K 4K 8K |6K
FREQ-Hz
END TO END
SYSTEM FREQUENCY RESPONSE,
NOISE FLOOR AND CREST FACTOR 80 dB(A) RANGE Figu
C Weighted
Noise Floor dB Be
0 C
•^f n
i
H
i
*j
c
H
H
-60 »
(i)
M
fD
10
-80
re 10
-------
(60)+1Q
c
CD
D
(Q
— -* r— 1
0 | -10
® .
^ "^ ^
) id
/?K °
(LJ w
w H -20
a to H
. 3
^^ tl
3 I
— \ a>
H m
-30
x-V ffl
( ) -o
.Co
3
-40
-50
.
-
;
_ /
/.
,
i
/
/
C Weighted
Use Left Scale
1
/
/ '
S*
f
/
/
1
f
^
•
X
- /->
/
/ :
^s
j
-
V
f
+ *
'•/
J
/ ,
t
- -
• /
^
-/ -
J
/
1
Y'
./
. / -
f
•*
s
-->,
'
-
-
-•i
'?
ZS
J
'x
s
t
f
s
- -
i
/
r
1 X
><
AERIAL MONITORING
• Clipping Level
^
A Weighted
Use Left Scale
- -
X
f
- -
- ^ -
X"
A
/
_(*^_
J*[
t~
- -
• •
i — •
-A-
< 1
C 1
Us
,4-
••t-J
• -
: J
Wei
e E
A
C
Us
- -
i
' ,'
>x
^* •»
1- —
.ghtec
tight
i
Weigh
WeigTi
e Lef
r— i
>- *.
--
• ~d
*" vT
r- —.
SYSTEM
?*N!
*n
J* *
Scale
i i i
ted Noise
ted Noise
t Scale
^
•» (
— -4
'
Fli
Flu
^ ~
i
h -
3Or
aor
- -
s
- ^
t
A
- -
315 63 125 250 500 1000 2K 4K 8K |6K
FREQ-Hz
END TO END
SYSTEM FREQUENCY RESPONSE,
NOISE FLOOR AND CREST FACTOR 60 dB (A) RANGE Figi
Noise
c
Tt
i
C Weighted
Floor dB Below Full
0 C
in i^
I I
cn
s
H
(D
-70
-80
ire 11
-------
b. C weighting - Type II
c. A weighting - Type II
d. C weighting Noise Floor - 30 dB
e. A weighting Noise Floor - 31 dB
Accuracy versus Distance
System end-to-end accuracy was verified by applying a known
acoustic stimulus to the microphone at various distances. System
accuracy is then determined by calibrating the system with the
transmitter located a short distance from the receiver, 10 m.,
and then leaving all calibration adjustment controls on the ground
station as is, and then repeating the acoustic stimulus calibra-
tion with the transmitter at various distances from the receiver
starting at 10 m. The A weighted calibration signals were recorded
on a General Radio Type 1521 level recorder with an 80 dB poten-
tiometer. The recorded calibration signals are shown in Figure 12 & 13
and it can be seen that system accuracy and stability is within
± h dB.
Compar ab i 1 i t y Tests
The accuracy and validity of the telemetry system was ver-
ified by recording a sample of noise with the telemetry system and
with a hardwired system and comparing the amplitude-time history
with each other. The telemetry system was positioned 150 m. from
the receiver antenna and the A weighted sound level recorded on
a Gen Rad 1521 level recorder. A Gen Rad 1933 sound level meter was
placed very close to the aerial telemetry system and the output
of the sound level meter recorded on a Gen Ran 1521 level recorder.
Both level recorders were adjusted to have damping overshoot and
creep matched as close as possible by applying an electrical
signal to their inputs which stimulated typical acoustical time
histories.
These two records are shown in Figure 14 and it can be
seen that the two signals track each other very well. The small
differences are due to differences in the graphic level recorders.
Flyability and Windscreen Evaluation
During the month of March, 1978, performance tests were con-
ducted at the NCAR test facility located south of Boulder. These
tests were primarily conducted to determine system signal to
noise ratio and accuracy under various operating conditions. One
of the tests performed was to determine the effectiveness of the
33
-------
2000 Hz 1000 Hz 500 Hz 250 Hz
: 10 meters
125 meters
250 meters
1 n /^n
-LU oa
•
1
— \-
r
,
__ ; _ _j
B^- . |
^MMMM^
! 1
375 meters
— —
— .
1
1
1
i
^^^
t
V
500 meters
meters
^Egi
750 meters
engineering dynamics me
N
;
-
3
-------
R—F-H—
875 meters
j i
1000 meters
t
•
10 dB
1 —
i —
ri
__:
— n — i
~r
E
—
—
1125 meters
35
-
-
-
enoineerinq dynamics nc
-------
CD
zs
CD
CD
a
Q
O
Co
O
,-..
Chart Speed 2.5 inches per minute
COMPARABILITY TESTS
Figure 14
-------
wind screen by towing the balloon and transmitter behind a
vehicle. It was observed first that the stability of the balloon
degrades at speeds greater than 24 km/h and secondly, the road
noise produced by the tires of the vehicle even at low speeds
was greater than 30 dB(A). It was observed from flight data that
the present wind screen design will allow the acquisition of
data up to wind speeds of 24 kmA, which is the stability limit
for the system. The balloon will fly at greater speeds, as great
as 48 km/h, but the balloon will oscillate and the transmitter
package flails around and impact noise is generated. With the
circularly polarized receiving antenna the balloon can be as much
as 45 degrees from the vertical at altitudes of 152 m.
During the winter measurements conducted at Boulder in 1978
the tether line was severed and the balloon drifted away. It was
found the next day near Greeley, Colorado, about 48 km from Boul-
der, where it had crash landed in a field. The only damage sus-
tained was several small punctures of the balloon itself; the
transmitter package was undamaged. This unplanned event served
to demonstrate the durability of the aerial package.
A unique windscreen was developed for the aerial package
microphone. Wind noise or pseudosound is produced by turbulence
acting upon the pressure sensing element of the microphone. The
scale or physical size of the turbulence is a function of the
physical configuration of the microphone; its orientation with
respect to the flow and flow velocity.
A windscreen serves to reduce the airflow velocity at the
microphone. However, the windscreen must perform two functions
that are in conflict; that is, it must reduce the velocity at
the microphone and at the same time be acoustically transparent.
To accomplish this the microphone is surrounded by a porous
barrier which slows the flow velocity. This can be accomplished
by a fine mesh such as cloth. Unfortunately, the reduction of
flow velocity achieved by the porous material also produces tur-
bulence which can be transduced by the microphone. The solution
to the problem is to select a mesh size such that the turbulence
has decayed to an acceptably small value by the time it reaches
the microphone. The use of concentric windscreens affords a
greater reduction in flow velocity and the second or interior
windscreen washes out the turbulence produced by the first wind-
screen. A further improvement can be achieved by making the first
windscreen teardrop in shape which has a lower aerodynamic drag
than a spherical windscreen.
-------
Although this double enclosure design provides considerable
reduction in "wind noise, the establishment of a finite relation-
ship between windspeed and the lower limit of useful data is
complex because of variability in data noise spectrum as it
relates to the windnoise.
Experience in actual operation of the aerial package in
Boulder during the winter and summer months has shown the most
effective way to determine when the wind is affecting the data
is to listen to the linear output of the receiving station thru
a pair of high quality headphones.
Laboratory Tests
Wind tolerance was determined by swinging the telemetry
package on a 4.6m line suspended from a 6.2m high acrobats prac-
tice rigging. The package was lifted along its path until it was
4.6m above its initial position and released so that it could
swing freely to and fro as a pendulum. The velocity at the
bottom of the first swing is about 9.49m/sec and reduces in value
with each successive swing. The "C" weighted output of the
ground station was fed to the octave band analyzer of a Gen Rad
1933 and then plotted on a graphic level recorder. The tests
were run at drop heights of 4.6 and 1.52m and with the wind
screen on and off. The reduction in wind noise with the wind
screen on especially at 9.49m/sec is very dramatic when the
analog signal is listened to over a loudspeaker. Figure 15 shows
the wind noise measured at 9.49 and 5.46m per second with and
without the windscreen and with the telemetry system set at 60dB
full scale. The results of the tests show that at 9.49m per
second the noise floor is equal to about 63 dB(A) and 56 dB(A)
with the wind screen on and off respectively. At 5.46m per sec-
ond the noise floor is 54 dB and with the windscreen off and at
most 47 dB with the windscreen on. Lower values with the wind-
screen on at 5.46m per second were not measurable because of the
ambient noise level at the measurement site.
Harmonic Distortion Tests
Harmonic distortion tests were conducted by the Electronic
Service Co., 865 Orman Drive, Boulder, Colorado. The tests
showed the aerial package to be within specification. A copy of
the test report certified by Mr. H. E. McKenna of Electronic Ser-
vice Co. is presented on the following page. In addition to
these tests the following test was conducted by EDI: A 1KHz signal
was applied at the microphone connector correspinding to full
38
-------
H. E. "Ed" McKenna
Engineering Efrnaan.es, Inc.
355 Orman Drive
Boulder Colorado
6651 South Wellington =0303
Littleton, Colorado 801 2\
DATE 3"? July 1976 _
INSTRUMENT CERTIFICATION:
This is to certify that the material listed below has been tested en the
dace shewn and has been found 10 be within the limits and tolerance indi-
cated in -he instrument's published specifications.
working Standards used for calibration are determined and maintained in
terms of reference standards periodically certified and traceable to the
National Bureau of Standards.
INSTRUMENT MFC . TYPE DEVICE S ./ N CALIBRATION TECHNIQUE
PROTOTIPE
Engineering I#r.amics,Inc Prototype Aerial Monitoring Package 1 ASSI Sl.k-1971 Type 2
Internal Noise and Distortion (romantic Hange) Worst Case Condition
70 dB on 60 dB Range
Distortion "C" Wfc Network 1.9* at 1000 Hz
Uistortion "A" Wt Network 1 ,Q% at 1000 Hz
Internal Noise 'ferst Case East. Package set 60 dB = O.OU IBT
" 70 d3 Foil Scale - 0.12? unr
SPECIAL NOTE: 3SF. EPA STIPPLED MKROrffNE CORP. MODEL 1100 A3 R
QLstootion to be less than 3%
page 5-13 para. 5-2li-B12
Foil tests should be carried out on all sections of
Aerial package to determine each section's distortion.
* At this time I feel that the majoritj of the distortion
in the system is coming from the MicroEHme Receiver,
HucH E. McKenna
Precision without accuracy is meaningless. Accuracy must be renewed periodically by
eans of certified calibrations." VQ
-------
OUI SOIUUDUAp &JUGGUl6uG
Ofr
Octave Band Levels dB
N> Ul J^ (Jl 9l
O O O O O
-
<
i
:
I
f
/
/
1 >
t- •-
- •
m
9.49m/sec
windscreen c
h
/-.
'•_'•_
/
'•£
•
/
I .
4
t
r<
•S-
ix-
'
— —
"X
p ^
N
-^{
• •
%
t
i
>ff
r •
^
S
i
- -
• -
<
/
'. I
t '.
: /
* <•
3.1 Jill/ BCIV!
windscreen on
. i
i
• -
• -
^
1
7
r .
/
. ;
'"i
ij
/
/
/
*
^
lr
!•-
n
>^
-«***
* • ^
fc— <
•)i^ 1
1
|^-
1
K
;
1 ' •
-
^
!•• •
>
*
»
^K .
-;
^
r-
i
Is
: .
.
• •
. :
- -
; ;
- -
.
• -
^
• -
V
» .•
- -
/
^~
X
1
^»
X
V
"i
4. 4- 4 -I- 4 4
5.46m/sec
j windscreen off -
: ;
•/
\
: \
•
N
\
/
r
1— •
\'*
y
/
wi
/
Xs
\
_• ••
x"".
/
/
5.
nd
/
si
^
r'
• •
/
46n
scr
[j
I
- -
I/S
eei
^
-r»i
3C
1 C
^**i
wl
n
h
-
l^x
- -
^j
-
-
• -
• •
I
r •
- -
- -
32 64 125 250 500 1000 2K 4K 8K I6K
FREQ-Hz
Windnoise Tests Figure 15
-------
scale for each sound level range. At these levels the following
2nd harmonic levels were measured at 2KHz.
SPL 1KHz 2KHz % 2nd
Range Level Level Distortion
110 110 -39dB 1.12%
90 90 -42dB 0.79%
70 70 -39dB 1.12%
50 50 -35dB 1.78%
Temperature Tests
In July of 1976 temperature tests were conducted with the
aerial package mounted in an altitude chamber such that the micro-
phone was sticking out of the chamber so that the acoustic cali-
brator could be connected to the microphone. Figures 16 through
18 show the system frequency response at several temperatures.
The lowest temperature achievable in the chamber during these
tests was -10°C and therefore it was not possible to test at the
-15° as specified in the contract. It was noted, however, that
the mercury batteries dropped about 2 volts at -IQOC. A 2 volt
drop per battery would be significant if the battery pack was
nearing depletion and the battery voltage was about 14 volts.
Then a 2 volt drop would bring the regulated power supply to be-
low 12 volts and the subcarrier VCO would exhibit excessive drift,
It was later discovered that the mercury batteries decreased
severly in voltage at -15°C and that operation of the aerial
package at this temperature was not possible. Operation to temp-
eratures as low as -20°C can be achieved if lithium batteries are
used.
Microphone Performance
The microphone used with the aerial package is a GenRad
Model 1971 one inch ceramic microphone. The ceramic microphone
was selected because of its resistance to high humidity; the
microphone will operate at 100% RH with slight condensation for
extended periods of time without a change in calibration. The
attached data sheet shows the specifications for the Model 1971.
Accuracy Tests - Flying Calibrator
On March 23, 1977, a G.R. Model 1562-A Sound Level Calibra-
tor was attached to the G.R. Model 1560-9570 1 inch diameter mi-
41
-------
10 dB
•
1
] ! I [ i ! ;
1
i
nl
D dB V **
i
i
4 UiJ
/!
ft
/tsp&o
! = 1 '
/
J Jfocc i
1
]
|
j
^
^
42
Figure 16
;noneenna dvncmics re
-------
T
10 dB
fiL
u
10 dB
T
-1—
4-3
Figure .17.
roineennQ dynamics nc
-------
I ;
10 dB
r
i
* » Ha V
Figure 18
44
eroneenna dvnomics inc
-------
Specifications
1971-9601 1-INCH CERAMIC MICROPHONE,
1971-9605 1-INCH CERAMIC MICROPHONE (1560-P5)
and 1971-9606 MICROPHONE ASSEMBLY (1560-P6).
Frequency: Curve shows typical response and guaranteed
limits; individual response curve supplied with each micro-
phone. Below 20 Hz, the microphone is typically flat =1 dB
down to 5 Hz. Time constant of pressure-equalizing leak is
typically 0.08 s.
Sensitivity Level: NOMINAL: -40 dB re 1 V/N/m1 (-60 dB
re 1 W^bar); MINIMUM: -42 dB re 1 V/N/m' (-62 dB re
1 V/Mbar). TEMPERATURE COEFFICIENT: - -0.01 dB/'C.
KEY SOUND-PRESSURE LEVELS: <1% distortion at 150 dB;
at -184 and +174 dB peak, microphone may fail.
Impedance: For 1560-9605 and -9570, 385 pF 2=15% at
23°C; for 1560-9606, 405 pF *15% at 23'C. TEMPERA-
TURE COEFFICIENT of Z, for both: 2.2 pF/ °C from 0 to 50°C.
Environment: TEMPERATURE: -40 to -f60°C operating. HU-
MIDITY: 0 to 100% RH operating.
Mechanical: TERMINALS, 3-pin mike connector; microphone
cartridge has two terminals plus the shell; both terminals can
be floated with respect to ground. DIMENSIONS: Cartridge
only, 1.13 in. (29 mm) long, 0.936 = .002 in. (23.7 mm = 50
^m) dia; 1560-P5 assembly, 2.31 in. (59 mm) long, 0.94 in.
(24 mm) dia; 1560-P6 assembly, 11.75 in. (298 mm) long,
0.94 in. (24 mm) dia. WEIGHT: 1560-P5, 0.2 Ib (0.1 kg)
net, 1 ib (0.5 kg) shipping; 1560-P6, 0.7 Ib (0.3 kg) net,
2 Ib (0.9 kg) shipping.
Typtcsl
withtne 1560-P42 and 1972-9600 Preamclifiers (Unity Gain)
• SfcnaBMtr
F?rt££r^"!
45
Figure 19
enaneerro civncmics nc
-------
crophone of the aerial monitoring package. The output signal
from the FM receiver was fed to a Gen Rad 1933 Sound Level Meter,
The electrical output of the "A" weighting circuit of the de-
modulator of the GR 1933 produced a reading of 105 dB which
corresponds to an actual sound pressure level of 112.82 dB at
1000 Hz. The system was then flown to an altitude of 457 m. in
increasing increments and the sound pressure level produced by
the calibrator measured as shown below. The GR 1933 was read to
the nearest 0.5 dB.
The equation for the altitude correction to the calibrator
is as follows:
dB = 114.4 - 0.914 x 10~3 H
where H is the altitude in meters above sea level.
Flying Calibrator
Test Results
Altitude (meters)
Above Ground Above Sea Calibrator Sound Level Change
Level Level Levels at Receiver dB
0 1605.9 112.93 112.93 0
39.6 1645.6 112.89 112.85 -0.04
60.9 1666.9 112.87 112.76 -0.11
121.9 1727.9 112.82 112.70 -0.12
243.8 1849.8 112.71 112.47 -0.24
335.3 1941.3 112.62 112.29 -0.33
457.2 2063.2 112.51 112.06 -0.45
It can be seen in the above table that the change is 0.45
dB or _+ 0.225 dB about the mean of -0.225 dB, which is within
the ± 0.5 dB specified.
Additional tests were conducted using a noise source on
the ground which consisted of a random noise source driving a
50 watt loudspeaker. The results were not acceptable because the
transmitter path through the air was not constant due to turbu-
lence and velocity gradients. The sound level did decrease
with altitude but the statistical variations were in excess of
i 2 dB at 61 m., and progressively greater at greater altitudes.
46
-------
The statistical variations may have been smaller if a more in-
tense noise source had been used.
Signal to Noise Ratio
On March 23, 1977, tests were conducted to determine the
system signal to noise ratio as a function of altitude with all
other environmental factors present such as: wind gusts, temper-
ature variations, and changes in antenna alignment. The A weight-
ed output of the ground station system was connected to a Gener-
al Radio sound level meter. This is a precision instrument and the
meter can be read to about 0.25 dB. The test site elevation was
1606 meters above sea level and at this altitude the sound level
produced by the G.R. 1562A calibrator is 112.82 dB at 1000 Hz.
When this calibration signal was applied to the aerial package
microphone the G.R. 1933 sound level meter read 105 dB. The
aerial package range selector was set to the 130 dB position
when this calibration signal was applied. To further reduce the
acoustic sensitivity of the package the one inch microphone
was removed and a half inch microphone with a 10 dB attenuator
was installed which made the full scale level about 143 dB(A).
This set-up would allow the measurement of the system noise
floor without being affected by actual acoustic input to the
microphone. Results of the test are as follows:
Altitude Sound Level
Meters dB(A) Slow
0 57 .18
40 60.18
61 60.18
122 53.18
244 61.18
These data show a signal to noise ratio of much greater
than 50 dB. But it should be noted that these levels were the
minimum levels observed on the meter and that there were fluc-
tuations which exceeded these levels. Thus, the next logical
test was to connect the ouput of the ground station to the Gen
Rad 1945 Community Noise Analyzer and collect data for % hour
intervals at various altitudes. Again the system was set to the
90 to 130 dB(A) range with the % inch microphone and 10 dB at-
tenuator to reduce the influence of actual noise upon the sys-
tem. Measured sound levels less than 97.82 dB(A) correspond to
noise from more than 40 dB below full scale. Several altitude
47
-------
73
72
72
72
72
40
39
38
71
74
70
69
69
69
58
52
51
79
70
70
70
69
69
53
53
52
68
73
71
71
71
71
68
39
39
72
72
69
68
63
63
62
62
62
66
82
73
70
66
63
61
61
61
72
87
71
68
63
61
60
60
60
98
71
68
64
62
61
60
60
60
95
120
63
62
62
61
60
59
59
101
traverses were made and the results from the additional testing
are as follows:
Altitude (meters)
90 - 130 dB(A) Range
Exceedance
Level 457 244 122 457 457 244 122 61 30
Max. 94 110 73 98 93 100 120 120 120
.1 89 104 72 90 89 96 120 120 120
1
5
10
20
50
90
99
Min.
Eq
Of the 9 tests, 2 failed to produce an L value equal to
or less than a signal to noise ratio of 40 dB. At this point
the test program was stopped and the reason for the poor signal
to noise ratio investigated. Two possible causes were found:
1. The antenna lead inside of the aerial package was
broken. One could speculate that this occurred
during the 121.9 m test, second run, because all
data after that test was not acceptable.
2. The combination of a dipole transmitting and a
dipole receiving antenna can result in minimum
signal strength when the antenna are aligned
orthogonally. A very simple solution to the
problem was discovered by replacing the dipole
receiving antenna with a circularly polarized
antenna.
The antenna lead was repaired and a circularized receiving
antenna was installed. The tests were repeated in April and the
system performance was measured as follows:
48
-------
74
73
72
71
70
70
69
63
52
75
74
73
72
71
70
68
65
53
77
75
72
71
69
69
65
63
58
76
73
71
71
70
69
69
63
57
89
73
70
67
65
63
61
61
60
80
75
72
69
65
60
60
59
55
79
74
71
70
66
61
59
57
56
76
75
73
70
67
65
61
60
54
74
73
71
70
69
68
65
60
55
Altitude (meters)
90 - 130 dB(A) Range
Exceedance
Level 30 61 122 244 457 244 122 61 30
Max. 75 77 79 77 91 83 81 78 76
.1
1
5
10
20
50
90
99
Min.
Eq 68 69 69 69 66 65 66 67 68
Operability
During the development tests and the actual monitoring of
noise over Boulder in the winter and summer EDI used parttime
employees who had no previous experience in operating the
aerial monitoring system. After a 4 hour training period these
persons were able to operate the system. A list of all personnel
who have operated the system including their approximate ages
and training follows:
Name Approximate Age Experience Level
H. McGregor 48 High
R. Chanaud 45 High
S. Rossi 27 High
T. Fenner 25 Low
D. Miller 22 Low
N. Ott 16 Low
G. Simmons 27 Low
S. McGregor 22 Low
D. Boettcher 22 Low
R. Black 22 Low
R. Dolan 24 Low
A. Griffith 24 Low
The following public employees and other non-EDI employees
also operated the system but not for extended periods of time:
49
-------
J. Adams Noise Control Officer, Boulder
R. Simmons U.S. EPA, Region VIII
H. McKenna University of Colorado, Boulder
During conduct of the program these operational factors
were observed:
1. There must be two trained operators on site at all
times when the balloon is being flown. The reason for this re-
quirement is that in the event of minor problems in handling
the balloon two people are required. Three operators should
be present when the balloon is being flown and there are near-
by thunder storms.
2. The balloon line must be inspected by running the
line out over the operator's hand so that knots or nicks in the
line can be detected.
3. The balloon line must be non-conductive.
4. The high pressure helium tanks must be handled
and transported with care. Tanks must not be stored upright
since they can tip over and inflict serious injury.
5. Extension cords used to provide the 120 v AC power
to the ground equipment must be of adequate capacity and secured
The momentary loss of power will result in the complete loss of
data when a statistical analyzer is being used. A power loss
inhibit signal can be used to correct this problem for certain
statistical analyzers.
6. If the power source used does not have provisions
for a third wire ground one must be provided by the operators
of the aerial monitoring system to insure the safety of the
equipment and personnel. This can be accomplished by driving a
.60 to .90 m metal stake into the earth and using the stake for
the required ground path.
50
-------
SECTION 6
AERIAL MONITORING TESTS
SITE SELECTION
The City of Boulder, Colorado, was selected for the test
site because the city has an active noise control program and
was one of the first communities to have a noise ordinance.
Also, it was near the mountains just west of the city that Dr.
Robert C. Chanaud and R. A. Simmons conceived the idea of aerial
noise monitoring. It should be pointed out that this entire pro-
ject is one of an exploratory nature and in the beginning it
was not known if the aerial monitoring technique was practical.
Considerable effort was spent by U.S. EPA, Region VIII, in prelim-
inary testing using a Gen Rad 1965 sound level meter strapped to
a metal box containing the transmitter and battery pack. These
early efforts were fraught with unforseen technical problems such
as equipment malfunctions, poor signal to noise ratio, signal
drop-out, and inadequate receiver sensitivity. However, sufficient
data was collected to demonstrate the feasibility of this aerial
noise monitoring technique.
The U.S. EPA, Region VIII, awarded .a development contract
to Engineering Dynamics, Inc. to produce an airborne noise meas-
urement system including a ground station. As part of the pro-
gram personnel monitoring was to be investigated and conducted if
there was equipment available to perform this task. Subsequent
research revealed that personnel monitoring was a much greater
task than first estimated and work on this concept was deleted
from the program.
It was decided to conduct the aerial monitoring during a
quiet and noisy season in the City of Boulder. Observations around
Boulder revealed that the summer is the noisiest season and
the winter the quietest, with the difference in noise levels
caused, for the most part, by motorcycles and barking dogs.
51
-------
Ten sites were selected that were uniformly spaced about
the city and would allow total integration of the noise produced
by Boulder. These sites were selected on the assumption that
the balloon could be flown as high as required, up to 760 meters,
The site location map which shows the sites selected for
monitoring follows as Figure 19 . A brief description of each
site follows:
Site No.
1
2
8
9
10
11
MEASUREMENT RESULTS
Location
2535 Meadow Avenue
Scott Carpenter Park near 30th Street
and Arapahoe Avenue
North Boulder Park near 9th Street and
Balsam Avenue.
1210 Hartford Drive (April)
1285 Georgetown Road (July)
University of Colorado campus near 28th
Street and Baseline Avenue
Near Maxwell Lake, north of Linden
Avenue, west of Broadway
Whittier School near 21rst Street and
Spruce Avenue
Omitted
1000 Rose Hill Drive
Baseline Avenue and Foothills Parkway
Martin Park near 39th Street and Martin
Drive (This was referred to as No. 4
on the log sheet)
The data sheets which follow show the exceedance levels
measured at 152 m. above each site during two measurement inter-
vals, ie., the quiet and noisy seasons. The original data sheets
52
-------
which have been retained in the EDI archives were recorded such
that a level of 93 corresponded to an actual level of 70 dB(A).
In order to avoid confusion by persons not familiar with the
decibel notation and calibration techniques, all of the data
has been corrected so that the sheets read actual sound pressure
level exceedance values in dB(A). Each data sheet is annotated
to show the occurance of any anomalies that happened during the
specific run, such as barking dogs and sirens. Unusual weather
conditions were also noted. Gaps in the data of significant dur-
ation are annotated while smaller gaps in time which occurred
when the data was being recorded or when the balloon was being
recharged with helium have not been, and are considered part
of the routine associated with such measurements. In general,
the quality of collected data was extremely good except for those
sites where excessive dog barking occurred. Tape recordings
of the analogue signal were taken at each site and can be used
for source identification. Each tape is clearly annotated so
that the listener can determine the season and site location.
The tape can be used, if desired, for spectral analysis.
The data sheets for each site are prefaced by a cover sheet
which summarizes the data and other pertinent information.
53
-------
Z 3 \4 5 6 7 8 » 10 17 12 13 14 15 16 17 18
-----JO
~f\. _ . ',"~"^' :!~;^j ^-TTr_ ~Z^L. -cT~*
B-0 U L D E R
COLO 4-A-9-0
54
Figure 19
-------
Site I
Site 1 was located at 2535 Meadow Avenue. The area is
residential with no nearby commercial activities. Meadow Avenue
is a narrow residential street and because of this traffic
speed and volume is restricted. The site is on the north end
of Boulder and free from the noise intrusions caused by Univer-
sity of Colorado students operating motorbikes, motorcycles and
cars with inadequate mufflers as is typical at the south end
of the city where the campus is located. Site 1, however, is in
line with the Boulder Airport and some of the data includes the
effects of aircraft noise. A summary of the test sequence follows:
SITE 1
Date Run No. Time Duration
3-29-78 1 07:11-08:11 1
3-29-78 2 08:11-09:11 1
3-29-78 3 09:11-10:11 1
3-29-78 4 10:25-11:25 1
3-29-78 5 12:42-13:42 1
3-29-78 6 13:43-14:43 1
3-29-78 7 14:57-15:57 1
3-29-78 8 17:10-18:10 1
3-29-78 9 18:23-18:53 %
7-17-78 1 05:32-06:32 1
7-17-78 2 06:33-07:33 1
7-17-78 3 07:35-08:35 1
7-17-78 4 08:37-09:37 1
7-17-78 5 10:21-11:21 1
7-17-78 6 11:50-12:50 1
7-17-78 7 12:55-13:55 1
7-17-78 8 16:18-17:18 1
7-17-78 9 17:30-18:30 1
8- 1-78 10 12:32-13:32 1
-------
Community Noise Analyzer
Data Sheet
Job No.
Date; 3-29-78
Sheet
Test Data
Check List
Switch
Up
Switch
Down
Remarks 1
Run No.
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ea
Dn
Remarks
/
/. o
~?: if
& '/
X
63
to /
*-9
S'-f
$ 3
£- ^
•A~ /
<"/
-TS
S~6
TV
*- 'i
7; //
^xT
feO
-<~8
* 7
-.-r-^
4- ^
5- /
V-0
'i
-------
Community Noise Analyzer
Data Sheet
Job No._
Date:
Sheet
3-29-78
of
Test Data
Check List
Switch
Up
Switch
Down
Run No.
Dur .Hrs .
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ed
Dn
-7
i.O
io, *£,'
i/ -'Zf
|^X^
6'-?
<&6
£/
3~d
^-y
tr /
•TO
-5"Q
'/$
4ft
•5~5~
y-i
_5'2
T?,
t^
1,0
/3-'«'5
/'/. 13.
"^I>-eC^
•5-5?
<"3
^ /
<^7
^7
*t?
*/&
'/&
£~i
'->-•*/
^ >
•"",1
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting
Fast Slow
Data Erase
Cal.
Altitude
Set Time
Clock Starts |~~
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
—
By:
Remarks 3
Remarks 2 Calibrator
new batteriew Cal. Level
Freer.
Site Location:
Site Map on Back of Sheet
5.7
engineering dynamics, nc
-------
Community Noise Analyzer
Data Sheet
Job No.
Date; 3-29-78
Sheet 3 of
Test Data
Check List
Switch
Up
Switch
Down
Run No.
Dur.Hrs .
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ea
Dn
7
i 0
/?'• ->~7
/I-.*?
:x
ev
a 3
5 /
J --=/
5~si
/~D
'/9
40
-?~6
r,~ <—
5-^
-•TO
s~6>
£-f~
t.- D
^2.
Remarks 1 15:50 next
door neigbor using
power mulcher
a
1 0>
/?-/&
16.10
^x:
7-/
&>'t
-•T"7
.rj?
5>-,a
^~0
*9
.r> -^
j'f
..<-?
x""1 "?
^1
5~f~
5^>
*~3
-~?~
9
r - '
/#./£3
/^,^-3
^x^:
^•«
^' 7
j-".>"
J5"^
-i~/
^."Jj
^f
Vf
3~f
A'f
-~/
-5"*>
^-V
-5' 3
5VI
^'/
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux Aux.
Weighting A
Fast Slow Slow
Data Erase
Cal. 94 = 70 dB
Altitude 152 m
Set Time
Clock Starts (~~
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
Bv:
Remarks 3
Remarks 2 Airplane Calibrator
Cal. Level
Freq.
Site Location: Site Al Bill Bryan's house, Meadow and Folsom
Next door neigbor running mulcher 16;50
mulcher stops 17;03
Site Map on Back of Sheet
58
engineering dynamics, nc
-------
Community Noise Analyzer
Data Sheet
Job No.
Date: 7-17-78
Sheet 1 of
Test Data
Check List
Switch
Up
Switch
Down
Run No .
Dur .Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
/
LC.
S>~: 3 2.
a ; :s 2.
^X^
7f
70
~
+-1
£> ~5
3
3
/- o
fi . -^~-
9.3*~
-? 5
e?
,<, sL
->~ *)~
-~4
-> ^.
•5~i
•$ I
^>?
^7
3~J5~
.-y~^y~
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting
Fast Slow
Data Erase
Cal.
Altitude
Set Time
Clock Starts |
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By:
Remarks 1 7:49 train horn 0:iy
still air
Remarks 2 7:11 plane Calibrator G R
Cal. Level »'•> = ^ ^
Freq.
ion: Site A 1 B811 Bryan's house
Meadow and 26th
Site Map on Back of Sheet
59
engineering dynamics, he
-------
Switch
Up
Switch
Down
Community Noise
Data Sheet
Test Data
Run No.
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
4
l.o
&• 5 7
9. 3 7
^>*^1
&3
~f9
-s~7
5~ 1
5~3>
5~S-
J~i
-5~O
sr &
5~*~
-"< .r^j
//.<£»
^x^
^5 6
«&3
— cr
-i /•
^'jS-
3' 3
•>-£.
3~/
A"0
.*"7
_'*3'~6>
^V
3^
O
A G
ifi3~ZJ
/Z^tv
~^5>-eC!^
6 J?
& f '
^r 7
-5- 3-
.f-3
5-2.
5 /
s~i
-•5- 7
5~fa
-5~-5"
is'-y
Job No.
Date: 7-17-7^
Analyzer Sheet 2 of
Check List
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux Aux.
Weiqhtinq A
Fast Slow slow
Data Erase
Cal.
Altitude 152 m
_3_
Set Time
Clock Starts \~
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
Bv:
Remarks 3 93 = 70dB Turn oyer tape
12:37
Remarks 2 power mower 11:00- Calibrator 93=70dB (run 4}
11:21 Cal. Level 92=70dB (run 5)
Freer. 1 Kz
:ion: Site Al Bill Bryan's house
Site Map on Back of Sheet
60
engineering dynamics, he
-------
Community Noise Analyzer
Data Sheet
Job No.
Date; 7-17-78
Sheet 3 of
Test Data
Check List
Switch
Up
Switch
Down
Run No.
Dur .Mrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ed
Dn
7
10
/£..-£->-
t3.3~f
^>A
ui7''-9
~^x^
£ 7
<0 -5
5--$-
£~ £.
5 1
s~~o
1 ?
1 7
f 4
5 ?
-5" ^
V ^,
30
7
/ o
/7 • ^O
'8.. 30
^rxdl
^^
6 ,i
5"6&
^ -f
-5~3
y i
-5~0
^<6
3"^~
5'f
S~3
5"-">
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux aux.
Weighting A
Fast Slow slow
Data Erase
Cal.
Altitude 152 m
Set Time
Clock Starts V~
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By:
Remarks 3
Remarks 2 93=70 OB, Pulled down atCalibrator
18:20-faulty transmitter connec- cal. Level
tion. Freer.
Site Location;
Bill Bryan's house
Site Map on Back of Sheet
61
engineering dynamics, nc
-------
Job No.
Date: 8-1-78
Community
Noise Analyzer Sheet 1
of 1
Data Sheet
Test Data
Check List
Switch
Up
Switch
Down
Run No .
Dur .Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
/
AO
//2 .'3?
I*; ->~ 4
Remarks I plane 13:00,
13:10
paane 12:20
Site Locat
A
i. 0
/-? . 5~Z.
H: ^^
j
_^>
2^>-«=cr
rJo
i#rm
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux aux.
Weighting A
Fast Slow slow
Data Erase
Cal.
Altitude 152 m
Set Time
Clock Starts f~~
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By:
Remarks 3
Remarks 2 train 14:07 Calibrator
14:33 down to 76 m due to winds cal. Level yj = /UdB
14:45 grounded due to winds. Freer L Kz
•ion: Bill Bryan's house
Down for day to windy and stormy conditions.
Site Map on Back of Sheet
62
engineering dynamics, he
-------
Site 2.
Site 2 was located in the Scott Carpenter Park near 30th
and Arapahoe. This site was closer to more cultural activity
and subjected to more motor vehicle noise than Site 1.
SITE 2
Date Run No. Time Duration
4-11-78 1 05:45-06:45 1
4-11-78 2 06:47-07:47 1
4-11-78 3 07:47-08:50 1
4-11-78 4 08:53-09:53 1
4-11-78 5 09:54-10:54 1
4-11-78 6 11:14-12:14 1
4-11-78 7 12:16-13:16 1
4-11-78 8 13:17-14:17 Aborted
4-11-78 9 14:30-15:30 1
4-11-78 10 15:45-15:45 1
7-18-78 1 06:00-07:00 1
7-18-78 2 07:00-08:00 1
7-18-78 3 08:22-09:22 1
7-18-78 4 09:25-10:25 1
7-18-78 5 10:45-11:45 1
7-18-78 6 12:13-13:13 1
7-18-78 7 13:15-14:15 1
7-18-78 8 14:33-15:33 1
7-18-78 9 15:48-16:48 1
7-18-78 10 17:03-18:03 1
7-18-78 11 18:28-19:28 1
7-18-78 12 19:30-20:30 1
63
-------
Community Noise Analyzer
Data Sheet
Job No._
Date:
Sheet
EPA
4-11-78
Test Data
Check List
Switch
Up
Switch
Down
Run No.
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ea
Dn
I
i
5-lr
C -vr
^X^"
7o
4s-
<, z
(, i
fl
?3
57
s~C
d
Ct
<,(?
5-1
Remarks 1
>"
/
(, 17
1 7-"*f7
r^xC"
(.?
c?
a
Ct
(,0
w
5-8
5-S
(2.
Cl
C(
Co
J
1
7 '•>-&
S:5-»
h^>-<^
7C
72.
C S
-------
Community Noise Analyzer
Data Sheet
Job No. EPA
Date:
Sheet
4-11-78
Test Data
Check List
Switch
Up
Switch
Down
Remarks 1
Run No .
Dur .Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
V
1
8 ?J
(\: S3
^x^1
7 'i
7 i
< §
6 a.
4 o
5"^
5~§
S7
&&
(, *i
(* t
(, (
Still Air
Helicopter 9:25
Site Loca
5"
1
f.^'r
10 : S-*/
~^x^
7 S
75-
65-
(= 0~
(, O
fl
5~ 8
57
<* 3
C Si
G\
(*\
c
1
11 ,f
)!'• tH
'Tj^xCUl
7 2.
6 8
£ r
GO-
\f 1
5~&
5-5T
CH
63
& 1
C(
Rat Test
1st Run
2nd Run
3rd Run
Min/Aux AUX
WPiqhtinq A
F*Rt 55 low S10W
Data Erase _
ral 94- /U db
altitude 152.4m
A
X
X
Set Time
rlonlc Starts i
Start Clock
Set Time Run
Regins
F.nable Run
Display Off
Tirne T.eft Site
Bv : SR and GS
Remarks 3 Recal 94=70 dB
Remarks 2 Fire TrucK siren ana calibrator
horn 9:57 Cal. Level 94=70 dR
Clouds coming in Freer.
tion- Site # 3 Scott Carpenter Park 30th and Araoahoe
Site Map on Back of Sheet
65
engineering dynamics, nc
-------
Job No. EPA
Community Noise Analyzer
Data Sheet
Date: 4-11-78
Sheet 3
Test Data
Check List
Switch
Up
Switch
Down
Run No.
Dur .Hrs .
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ea
Dn
7
1
1 1 • i C
} 3-iC,
^X^"
67
C-t
C
-------
Job No.
EPA
Community Noise Analyzer
Data Sheet
Date:_4-ll-78
Sheet
Test Data
Check List
Switch
Up
Switch
Down
Run No .
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
1C
I
/ r • •vr
/6.
-------
1
Switch
Up
Switch
Down
Community Noise i
Data Sheet
Test Data
Run No.
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ed
Dn
i
1
£ oo
7 Oo
>»
-------
Job No. EPA-228
Date: 7-18-78
Community Noise Analyzer Sheet 2 of ^
Switch
Up
Switch
Down
Data Sheet
Test Data
Run No.
Dur.Hrs.
From
To
L Value 1
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
V
1
~ccdl
7 §
76
6 g
5"*?
6 6
65~
6 5"
^j'
Check List
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting
Fast Slow
Data Erase
Cal.
Altitude 152.4m
{
<
t
A
Set Time
Clock Starts I
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By: LG
Remarks 3
J"u/ Calibrator GR
Cal. Level 93=70 dB
Freq. 1KHz
:ion: Site A2 Scott Carpenter Park
Map on Back of Sheet
69
engineering dynamics he
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date; 7-18-78
Sheet 3
of
Test Data
Check List
Switch
Up
Switch
Down
Run No.
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
7
1
IB if
14 /?
!5>
67
6c
6 V
(£ 3
^
/
1 5-'v§
1 (o V?
"^>-<,
6r
6^
£?
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting
Fast Slow
Data Erase
Cal.
Altitude 152.4m
X
X
X
A
X
Set Time
Clock Starts |~
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By: NO and KR
Remarks 3
Remarks 2 Calibrator nR
Cal. Level 93-70 dB
Freq. 1KHz
ion: A2 Scott Carpenter Park
Site Map on Back of Sheet
70
engineering dynamics, nc
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date; 7-18-78
Sheet 4
of
Test Data
Check List
Switch
Up
Switch
Down
Run No .
Dur.Hrs.
Prom
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
10
/
I"?', o.?
1 8 :o 3
^xcT
72.
(, 7
65
6 3
<*(
6e
s-9
s-8
G^i
C-3 •
Ci
62.
Remarks 1 pool Announce-
ment 5:08
Site Locat
)/
i
1 g'2*
1 9.-2.S
]^>-<^r
76
67
6x
6 D
?1
5"S
S3
>7
tl
0,
(y 0
ft
Bat Test
1st Run
2nd Run
3rd Run
Mi (-/Any
Weighting
Fast Slow
Data Erase
Cal.
Altitude 152.4m
X
X
X
A
Set Time
Clock Starts [~
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By: NO
Remarks 3 Horn in Parking lot 7:35
Pool Radio 7:50
Remarks 2 Pool Announcement 6:54 Calibrator GR (run 11 )
Cal. Level 93=70 dB, (92=70 dB)
Freer. 1KHz
ion: A2 Scott Carpenter Park
Site Map on Back of Sheet
71
engineering dynamics, nc
-------
Site 1
Site 3 was located at North Boulder Park near 9th and Balsam
Street which is in a residential area. This site was selected
as the location that would include a weekend for comparison with
weekday noise levels.
SITE 3
Date Run No. Time Duration
3-31-78 1 06:45-07:45 1
3-31-78 2 08:08-09:08 1
3-31-78 3 09:10-10:10 1
3-31-78 4 10:26-11:26 1
3-31-78 5 12:27-13:27 1
3-31-78 6 15:10-16:10 1
3-31-78 7 16:12-17:15 1
3-31-78 8 17:15-18:15 1
4-1-78 1 06:15-07:15 1
4-1-78 2 07:30-08:30 1
4-1-78 3 08:43-09:43 1
4-1-78 4 09:43-10:43 1
4-1-78 5 10:43-11:43 1
4-1-78 6 12:00-13:00 1
4-1-78 7 13:00-14:00 1
4-1-78 8 14:00-15:00 Aborted
4-1-78 9 16:40-17:40 1
4-1-78 10 17:40-18:40 1
4-1-78 11 18:50-19:50 1
4-2-78 1 05:15-06:15 1
4-2-78 2 06:30-07:30 1
4-2-78 3 07:30-08:30 1
4-2-78 - 08:30-11:00 Aborted
4-2-78 4 11:04-12:04 1
4-2-78 5 12:20-13:20 1
4-2-78 6 13:35-14:45 1
4-2-78 7 14:50-15:50 1
4-2-78 7 15:55-16:25 0.5
72
-------
Site 3 Continued
Date
7-21-78
7-21-78
7-21-78
7-21-78
7-21-78
7-21-78
7-21-78
7-21-78
7-21-78
7-21-78
Run No.
1
2
3
4
5
6
7
8
9
10
Time
06:18-17:18
08:04-08:34
10:32-11:32
11:34-12:34
12:37-13:37
13:55-14:55
15:00-16:00
16:27-17:27
17:35-18:35
19:26-20:26
Duration
1
0.5
1
1
1
1
1
1
Aborted
1
7-22-78
7-22-78
7-22-78
7-22-78
7-22-78
7-22-78
7-22-78
7-22-78
7-22-78
7-22-78
7-22-78
7-22-78
1
2
3
4
5
6
7
8
9
10
11
12
05:51-06:51
06:53-07:53
07:55-08:55
09:31-10:31
10:31-11:31
11:36-12:36
12:50-13:50
14:43-15:43
15:46-16:46
17:02-18:02
18:16-19:16
19:19-20:19
1
1
1
Aborted
1
1
1
1
1
1
1
1
7-23-78
7-23-78
7-23-78
7-23-78
7-23-78
7-23-78
7-23-78
7-23-78
7-23-78
7-23-78
7-23-78
1
2
3
4
5
6
7
8
9
10
11
05:55-06:55
06:57-07:57
07:59-08:59
09:22-10:22
10:28-11:28
11:33-12:33
12:35-13:35
13:55-14:55
15:00-16:00
16:02-17:02
17:17-18:17
1
1
1
1
1
1
1
1
1
1
1
73
-------
Site 3 Continued
Date Run No. Time Duration
7_23-78 12 18:18-19:18 1
7_23-78 13 19:31-20:31 1
7_25-78 1 05:39-06:39 1
7-25-78 2 07:33-08:33 1
7-25-78 3 08:34-08:34 1
7_25-78 4 11:21-12:21 1
7_25_78 5 12:23-13:23 1
7_25_78 6 13:41-14:41 1
7-25-78 7 14:45-15:45 1
7 25_78 - 15:47-16:12 Aborted
7_25_78 8 16:12-17:12 1
7_25-78 9 17:14-18:14 1
7 25-78 10 18:30-19:30 1
7_25-78 11 19:31-20:01 0.5
74
-------
Community Noise t>
Data Sheet
Test Data
Switch
Up
Switch
Down
Run No .
Dur .Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ed
Dn
1
I
G ^r
7 TT
^xd"
67
63
3~§
5
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date; 3-31-78
Sheet 2 of 3
Test Data
Check List
Switch
Up
Switch
Down
Run No.
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ea
Dn
4
;
10 it.
II Zt
^x^"
7C
73
GC
*1
5-6
:>-
-------
Community Noise Analyzer
Data Sheet
job No. EPA-228
Date: 3-31-78
Sheet 3 of
Test Data
Check List
Switch
Up
Switch
Down
Remarks 1
Run No .
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
Remarks
7
i
1C, 11
17. u
^x^
7&
(•1
G 2.
5~S
St
Sf
51-!
5-?
66
5-1
57
F7
2
§
1
17 is-
19" i«-
*~^x^
ts
— cCZ
Remarks 3
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting
Fast Slow
Data Erase
Cal.
Altitude
Set Time
Clock Starts
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
Bv:
Calibrator
Cal. Level 93=70 dB
Freer.
~
Site Location; North Boulder Park
Site Map on Back of Sheet
77
engineering dynamics, inc
-------
Community Noise Analyzer
Data Sheet
Job No. EEA-228-.
Date; 4-1-78
Sheet I of
Test Data
Check List
Switch
Up
Switch
Down
Remarks 1
Run No .
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ea
Dn
Remarks
i
i
s —
<3 1 5
?• ir
^X^
* *
6 ,'
S<,
sv
yj
5~c>
11
",3
5T
.5^
5Z>
.Fi
2
^
^
7 ?t,
S'^o
T^xCT
63
-
-------
Job No. EPA-228
Community Noise Analyzer
Data Sheet
Date: 4-1-78
Sheet 2
of 4
Test Data
Check List
Switch
Up
Switch
Down
Run No .
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
H
\
1-t?
10 "if
^XC^
7o
£.?
?c
5-y
5f
s ?
52.
5'
5-J
5-6
5*5-
5~r
t
/
| Z 06
IJ DC-
^^xdT
62.
ie>
5"?
s-<;
5-5-
5V
5J
5-7
rs>
^7
5"i
5~5~
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting A
Fast ILIeij
Data Erase
Cal.
Altitude 152.4m
X
X
Set Time
Clock Starts I
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
K
By:
Remarks 3Rain 12:ib \shover;
Remarks 2 10:58 Siren Calibrator GK
Cal. Level 70 dB 1000 Hz=94 dB
Freg. 1000 Hz CNA
bion: Site # 3 North Boulder Park at 9th and Balsam
Start Tape. Side 1 12:00 Cal; 70 dB 1KHz
Side 2 12;50 ends 1;40
Site Map on Back of Sheet
79
engineering dynamics, he
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date; 4-1-78
Sheet 3 of
Test Data
Check List
Switch
Up
Switch
Down
Run No.
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ea
Dn
7
(
1300
I1OC
^xcC
4s-
63.
?1
s-a
s~y
5-3
52
51
T$
$7
Ft
5-5-
Remarks 1
12:25 Thunder
12:30 Jet
?
I
/•YOO
15~00
^X^1
A/C
T>ATA
1 _J
1
16 fO
I7^o
"2^>-«Cd
-------
Switch
Up
Community Noise J
Data Sheet
Test Data
Run No .
Dur .Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
10
1
17^0
18^0
^><^
It
It
82
6?
57
?7
5-Z
si
II
I85-0
J-
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228^
Date; 4-2-78
Sheet 1 of
Test Data
Check List
Switch
Up
Switch
Down
Remarks 1
Run No.
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ea
Dn
Remarks
•
i
-5" ir
C ir
]^XC^
5-3.
5 i
JJ-D
TS
1(,
IT
H*,
13
5*0
It
H7
17
2
2
i
(, 3t>
\7fO
Cxd
s- 3
Si
51
T!'
17
1C
"T5-
1l
?1
SO
i 8
*y g
J
/
7 -?£
S.J-c-
"^r=»-
-------
Community Noise Analyzer
Data Sheet
Job No.
Date; 4-2-78
Sheet 2
EPA-228
of 3
Test Data
Check List
Switch
Up
Switch
Down
Run No.
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
V
/
\l-C1
^^
(-1
£r
s~i
5-5-
5Z
j/
.Tc.
13
5-3
sc
S^t
5J-
Remarks 1
Site Local
F
/
; r.2-0
U'.iO
">
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date; 4-2-78
Sheet 3
of 3
Test Data
Check List
Switch
Up
Switch
Down
Remarks 1
Run No.
Dur.Hrs.
From
To
L Value-
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
Remarks
7
It yO
If- $0
1
^xC
6s-
(,f
(,c
ft.
fj-
51
s-/
**1
$1
57
5T
^r
2
g
If- 5-5-
\C is-
O. r
^x^"
(•7
<•(.
(,3
SB
•ST
s-7
Si
51
Ci
JV
J7
«
/6
(7
O
F"~"~-~.
_^*~~
V
~&t
i
Rem<
^
J*D
o^>
.5-
*<^
|
0
^TA
arks 3
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weiqhtinq
Fast Slow
Data Erase
Cal.
Altitude
Set Time
Clock Starts
Start Clock
Set Time Run
Beqins
Enable Run
Display Off
Time Left Site
By:
Calibrator
Cal. Level
Freq.
~
Site Location;
Site Map on Back of Sheet
84
engineering dynamics, n
c
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date: 7-21-78
Sheet 1 of
Test Data
Check List
Switch
Up
Switch
Down
Run No. ^
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
i
;
6 IS
7 ' ;?
^xCT
5-7
if
5T
SJ
SI
'I 1
IS
H(.
*1
53
52-
51
Remarks 1
Site Local
**-
O. 5"
S 01
, %: J--V
^>~
-------
Switch
Up
Switch
Down
Community Noise
Data Sheet
Test Data
Run No .
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
iy
;
}! • J-i
>l 7
-------
Job No. EPA 228
Community Noise Analyzer
Data Sheet
Date; 7-21-78
Sheet 3
of 4
Test Data
Check List
Switch
Up
Switch
Down
Run No.
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
7
1
1 f oc-
'6. oo
!zxir
78
7^'
6-7
s .
5^i
5" J
5"Z
51
6c
y 5
rr
i"t
Remarks 1 Ambulance 3:56 ,
Site Locat
8
1
«•. 2-J
17-17
^x^
d>t
(,~
-------
Switch
Up
Switch
Down
Community Noise
Data Sheet
Test Data
Run No.
Dur.Hrs.
From
To
L Value ^
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ecr
Dn
10
1
! <\ :£
20' zc
^X^j
3C
5-?
S(,
5~f
*T
Remarks 1
Site Locat
^xCT
^x^
Job No. EPA- 2 28
Date: 7-21-78
Analyzer Sheet 4 of 4
Check List
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting
Fast Slow
Data Erase
Cal.
Altitude 152.4m
L
V
£
Set Time
Clock Starts 1
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By: LG
Remarks 3
Remarks 2 Calibrator GR
Cal. Level 93=70 dB
Freq. iKIJz
:ion: A ? North Boulder Park
Site Map on Back of Sheet
88
engineering dynamics, nc
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date: 7-22-78
Sheet 1 of 4
Test Data
Check List
Switch
Up
Switch
Down
Run No .
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ea
Dn
i
1
5-5V
6 si
^xCT
C
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date; 7-22-78
Sheet 2 of 4
Test Data
Check List
Switch
Up
Switch
Down
Run No.
Dur -Hrs .
From
To
L Value
Max
.1
1
10 j
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
V
ffi
j o ' Tl
liXC"
A/0
vm
i
1
Remarks 1 9:42 airplane
Transmitter Batteries wear
Take Balloon down to chang
Site Locat
_<-
i
10: Ti
II ' Ti
^xC^
6.T
Cl
5~1
5~C
51
•57
5"!
^r
J-g
57
rs-
5-5-
e
c
1
H-JTC.
11 7<-
^xd
71
68
62
3-?
5T
5J
5"?
51
(JO
-T5
5-6
5-6
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting
Fast Slow
Data Erase
Cal.
Altitude 152.4m
X
SL
Set Time
Clock Starts f~
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By: DM
Remarks 3
Remarks 2 Calibrator
Cal. Level y^-/u QV
Frea. 1KHz
?-o.n.: — A ? N"T"t"'h Rnnlri^r Parl^
Site Map on Back of Sheet
90
engineering dynamics, nc
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228_
,. 7-22-78
Sheet
of
Test Data
Check List
Switch
Up
Switch
Down
Remarks 1
Run No .
Dur .Hrs .
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
/
I
\-L-lG
/?• 5-0
^X^
48
&&
C.T-
58
5-5
5-7
Jl
5-1
<•!
S-$
JT?
5T
Site Loca
S
/
K --?
Iv^J-
•^>«<^
<17
6i
d2.
ys
5T
5J
f2
3"'
-
-------
Switch
Up
Switch
Down
Community Noise
Data Sheet
Test Data
Run No.
Dur.Hrs.
From
To
L Value ,
Max ,
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ea
Dn
10
1
17 01
I2'0i
x:
6 J
tf a.
5-1
?(,
S*
5Z
5\
Si
5~8
.Tt
5".T
r*t
Remarks 1
Site Locat
//
/
(8 1C
11 !(.
X
65-
GJ
60
97
5J
5-2.
51
Hi.
*1
ys
5V
^
12
1
W'tl
20 : >1
^xC
-^__ «,
£i
5-1
5-5
5-?
S>
TO
5~0
FS
57
-^1
5?
Job No. EPA-228
Date: 7-22-78
Analyzer Sheet 4 of 4
Check List
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting
Fast Slow
Data Erase
Cal.
Altitude 152.4m
X
A
K
Set Time
Clock Starts f~
Start Clock
Set Time Run
Begins 1
Enable Run
Display Off
Time Left Site
By: LG and DM
Remarks 3
Remarks 2 Calibrator GR
Cal. Level 93=70 dB
Frea. 1KHz
•ion: A3 Nnrth Boulder Park
Site Map on Back of Sheet
92
engineering dynamics, nc
-------
Community Noise Analyzer
Data Sheet
Job No.
Date: 7-23-78
Sheet
1
of 5
Test Data
Switch
Up
Switch
Down
Run No .
Dur .Hrs .
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
I
I
5- 5i~
£ ff
X"
F-
-------
t
I
!
!
Switch
Up
Switch
Down
Community Noise
Data Sheet
Test Data
Run No.
Dur.Hrs.
From
To
L Value
Max
.1
L.
1
1 2i
10 ' ^z
^>-<^
<.?
<•(
1 *s
10
50
90
99
Min
.5/24
1/24
8/24
. 5/8
2
5
20
Eq
Dn
ST
n
s>
S-fc
V?
i 7
5-c
JT^'
5T
Remarks 1
Site Locat
r
r
(0 IS
I/ 2S
T^xd"
6C
(f r
i'o
3~C
s-j
?2
S/
V?
?1
57
rr
5~T
6
/
//.' 33
12. JJ
^x^
t-7
(, r
c- z
^7
rs
F7
S7
3 '
60
s-s
i~i
.TC
Job No.
Date: 7-23-78
Analyzer Sheet 2 of 5
Check List
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting A
Fast Slow
Data Erase
Cal.
Altitude 152 m
Set Time
Clock Starts 1
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By:
Remarks 3
Remarks 2 Calibrator
Cal. Level 93=7 OdB
Freer.
ion: A3 North Boulder Park
Site Map on Back of Sheet
engineering dynamics, he
I
1
-------
Job No.
Date: 7-23-78
Community Noise Analyzer Sheet 3 of 5
Switch
Up
Switch
Down
Data Sheet
Test Data
Run No .
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ea
Dn
7
/
12 ?r
]7.3T j
Ix^j
(cT
(-1
*1
s~c
$•?
F2.
5~l
5"f
s&
y?
5~S~
S'l
Remarks 1 1:02 airplane
Site Locat
s
1
If- > 5-
) v rr
T^xc^"
6J-
(/<
Cfr
57
J"f
JZ
r/
^
ff
5"S
5" 5"
SI
f
/
/r-rc.
J6 OC»
^>-<^
62.
^/
J?
5-C
s~1
5^
-T I
5°
5"J
?7
T'T
yt
Check List
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting
Fast Slow
Data Erase
Cal.
Altitude 152 m
Set Time
Clock Starts |~
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
Bv:
Remarks 3
Remarks 2 Calibrator
Cal. Level y^'UdB
Freq.
:ion:
A3 North Boulder Park
Site Map on Back of Sheet
95
engineering dynamics, he
i
-------
Community Noise Analyzer
Data Sheet
Job No.
Date:
Sheet
7-23-78
Test Data
Check List
Switch
Up
Switch
Down
Run No.
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
\e>
/
1C.. a
17 'Oi
IXT
75-
77
(. S
T7
yj
st
>0
•vs
65-
60
5~r
5-7
Remarks 1 4:52 police
sirens; 5:00 siren
Site Locat
\i
i
17 'i 7
]?••(? 1
^xCT
C(,
62
-"•/
5-6
FT1
5'
5-e
*it
3~S
>7
5-b-
5*t
/^
/
;s -/s
I'? /S
~^z=~<^
7C
(.(,
4/
^
s-j-
5-/
TO
11
S~f
y7
S~<1
^7
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting
Fast Slow
Data Erase
Cal.
Altitude 152 m
Set Time
Clock Starts f~
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By:
Remarks 3 Max. value unaccountable
Remarks 2 Calibrator
Cal. Level 93=70dB
Freq.
ion:
A3 North Boulder Park
Site Map on Back of Sheet
96
engineering dynamics, nc
-------
Switch
Up
Switch
Down
Community Noise
Data Sheet
Test Data
Run No.
Dur .Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
EQ
Dn
IJT
1
n j-i
^o:sl
X^
(,(,
Gf
(,i
5~t
5T
FJ 1
y;
s-/
61
*)
5-7
5-C
Remarks 1 7-sq s-irpn
Site Locat
•xr
"
^XT
Job No.
Date: 7-23-78
Analyzer Sheet 5 of 5
Check List
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting
Fast Slow
Data Erase
Cal.
Altitude 152 m
Set Time
Clock Starts F
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By:
Remarks 3
Remarks 2 Calibrator
Cal. Level
Freq.
•ion: North Boulder Park
Site Map on Back of Sheet 97
engineering dynamics, nc
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date:
Sheet
7 — 25-78
of
Test Data
Check List
Switch
Up
Switch
Down
Run No .
Dur.Hrs.
From
To
L Value
Max
. -L
1 ,
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
I
/
5"?1
;==<•
S<
7§
72
6£
ST
.T/
^S
17
61
£5-
?i
G-o
Remarks 1 Windy - pkg
making noise
Change line
Site Locat
iL
1
7'J-J-
s 73
X"
47
Cl
JS
5b
5"J
Si
fl
(•1
?1
57
s-c.
?
1
3 ?1
1 -?v
iii^^^cr
N/5
P/HTt
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting A
Fast Slow
Data Erase
Cal.
Altitude 152.4m
Set Time
X
X
JC
Clock Starts f"
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By: GS and DM
Remarks 3
Park turned on sprinkler, soaKeq every-
thing. Run cut short
Remarks 2 Windy Calibrator GR
Balloon to 30.48m due to wind Cal> Level 93-70 dB
Freq. IKHZ
ion: site A 3 North Boulder Park
Site Map on Back of Sheet
g8
engineering dynamics, he
-------
Switch
Up
Switch
Down
Community Noise
Data Sheet
Test Data
Run No.
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
*r
/
ii .'a
H 21
I^xCT
LI
£j*
60
i7
-TT
57
?i
Tl
51
*$
i~C
rr
Remarks 1 Windy
Site Local
5-
i
IZ i7
I7'27
^xdr
76
7r
Cl
s- a
5V
5*2
i-/
TO
?*!
j"7
5~S-
rt
6
/
/?. -v/
'*»••«/ 1
^>-<^'
7S
7^
6T
5*6
JT
?Z
SI
^2
Ci.
rs
S-T
re
Job No. EPA-228
Date: 7-25-78
Analyzer Sheet 2 of 4
Check List
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting
Fast Slow
Data Erase
Cal.
Altitude 152.4m
Set Time
Clock Starts
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
X
A
_
By : DM and LG
Remarks 3 Windy - Package Noxsy
Siren 1:50 H
Remarks 2 Windy Calibrator GK
Cal. Level 92=70 dB
Freq. 1KHz
ion: Site A 3 North Boulder Park
Site Map on Back of Sheet 99
engineering dynamics, nc
1
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date; 7-25-78
Sheet 3 of
Test Data
Check List
Switch
Up
Switch
Down
Run No.
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ea
Dn
7
i
'Vfr
if •yr
^x^
77
67
Cl
5-7
S-i
SJ
*;
SI
fl
57
5-(,
Tf
Remarks 1 Lost power for
1 second - 3 :43,Intermittc
Thunder
Site Local
^xd"
nt
S
;
;
-------
Community Noise P
Data Sheet
Test Data
Switch
Up
Run No.
Dur .Mrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
9
' /
17-11
IS-' "Y
^XC^
tt
(.7
?1
57
5-y
5-J-
fZ
$-!
1C
1
IS J-f
If. Jo
~^X^
6»
to
J S
re
>"-r
s-z
s-/
1-r
//
c. r
'^.•//
2O.'0|
~^xd
SY
SY
5V
60
5-5-
TZ
5-/
VJ
Job No. EPA- 2 28
na1.p: 7-25-78
nalyzer Sheet 4 of 4
Check List
Rat Test
1s1- Run
5nfl Run
•^r-ri Run
Mic/Aux
Wsiqlrt-inq
Fast Slow
Data Erase
ral.
Altitude 152.4m
X
A
Set Time
rlo^Tc Starts 1
Start Clock
QPI- Time Run
R«=rri ns
Site Map on Back of Sheet
101
engineering dynamics, me
-------
Site 4_
Site 4 is located at 1210 Hartford and at 1285 Georgetown
Street. The first set of measurements were conducted at 1210
Hartford in the winter season. When the balloon was taken back to
this site the technicians manning the station were met with ob-
scenities and threats of violence. Rather than waste time attempt-
int to negotiate with the individual it was deemed expedient to
relocate to the adjacent block where the site was established
without incident at 1285 Georgetown Street.
SITE 4
Date Run No. Time Duration
4-13-78 1 05:55-06:55 1
4-13-78 2 06:55-07:55 1
4-13-78 3 07:58-08:58 1
4-13-78 - 08:58-11:45 Aborted
4-13-78 4 11:45-12:45 1
4-13-78 5 12:46-13:46 1
4-13-78 6 14:00-15:00 1
4-13-78 7 16:30-17:00 h
4-13-78 8 17:15-18:15 1
7-20-78 1 05:44-06:44 1
7-20-78 - 06:44-09:28 Aborted
7-20-78 2 09:28-10:28 1
7-20-78 3 10:32-11:32 1
7-20-78 4 11:46-12:46 1
7-20-78 5 12:46-13:46 1
7-20-78 6 15:48-16:48 1
7-20-78 7 17:38-18:38 1
7-20-78 8 18:38-19:38 1
7-20-78 9 19:38-20:38 1
102
-------
Job No. EPA- 228
Date: 4-13-78
Community Noise Analyzer Sheet 1 of 3
Switch
Up
Switch
Down
Data Sheet
Test Data
Run No.
Dur .Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eo
Dn
-• ^>
jr s'^r
c& . s~^
^>xCl
61
6O
-<"«
ri~Q-;
* r *'*
<-£.
^ro
_£~O
5 7
— ' »
t-'^
- - -y
Remarks 1 Still air
Little traffic static
(hi (max)) Doqs
Site Locat
^L
/ . CJ
•^ . -5-5 '
-• . _> <~
"^x^T
r?
>~9
^^
2~ —
< _5~
^ ^
-T '/2-
37
j"<9
-5" 7
3"^
—X
_J
/ o
7 -5 d
& . f- -&
^'^x^l
6- 0
^9
^r
^_ — /
-•T£
_£-- 5"
-^1
Check List
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux Aux
Weighting A
Fast Slow Slow
Data Erase
Cal. 94=70 dB
Altitude
Set Time
Clock Starts |~
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By:
Remarks 3 Still Air
Remarks 2 Still Air, Dogs, Calibrator
Little traffic Cal. Level 94=/U dB
Frea. 1KH2
:ion: Site A 4 1210 Hartford
Site Map on Back of Sheet
103
engineering dynamics, nc
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date; 4-13-78
Sheet 2 of
Test Data
Check List
Switch
Up
Switch
Down
Run No .
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
•y
1 0
tt • *£
'^=:
63
s'8
•; ±~
£~3
f—i
5-7
"73
jS~7
5~6
*~1
5 4
Remarks 1
Site Local
.T-
f C7
I'2..t6
^.^^
-~9
>'A
*-&
A~_5
Tl
s~o
^9
T7
^6
-5~.-r
.^"•f
«0
/ o
it oo
•^^
63
6 ^
s~?
<-5-
^-^
^'/
rTD
S'a
*"£>
s~6
-3.5
S^
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weiahtinq
Fast Slow
Data Erase
Cal.
Altitude
Set Time
clock Starts I
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
Bv:
Remarks 3
Remarks 2 Calibrator
Cal. Level
Freq.
tion: Site A 4
Site Map on Back of Sheet
104
engineering dynamics, nc
-------
Community Noise Analyzer
Data Sheet
Job No.EPA-228
Date; 4-13-78
Sheet 3
of
Test Data
Check List
Switch
Up
Switch
Down
Run No .
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
1
^.
5
20
Ea
Dn
S
r $'
/<£,^C3
i / • C-O'
^>-~
^>-<^
0? ''
(^ X
(oO
^/ /
^- *.—
n- ~,
*~i
*. 9
5-9
s-j^
-r"cj
<"<"
7Hx^
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux Aux
Weighting A
Fast Slow Slow
Data Erase
Cal. 94=70 dB
Altitude
Set Time
Clock Starts |~
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By:
Remarks 3
Remarks 2 Calibrator
Cal. Level
Freer.
tion: 1210 Hartford Aite A4
Site Map on Back of Sheet
105
engineering dynamics, nc
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date:_
Sheet
7-20-78
of
Test Data
Check List
Switch
Up
Switch
Down
Run No .
Dur.Hrs .
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
EQ
Dn
/
/ a
s~. V f
£.--•/ Y
!Zxd
Bz.
& 7
• *>'<
-^"O
f 0
•7 7
"7 >
•yx-
---' -<.
5~i
-yy
-yr
Remarks 1
105 Max Unaccountable
Site Locat
z.
.' £*
y. ;-i a
to;z-t-:
^xC"
6 £
d> C>
s~£
^s —s
£. ^
3 /
*?t~>
9?
jTf
f&>
S- -Z>
*'•?
—~^
/ &
/^••32.
// / -3 2-
^>— <^
(a !
(&O
i"9
^r tj
5-^
-3~^L
>"7
4?
^'B
5-7
5^
$~i
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting
Fast Slow
Data Erase
Cal.
Altitude 152.4m
X
A
X
Set Time
Clock Starts I
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By : LG
Remarks 3
Remarks 2 Calibrator
Cal. Level 93=70 dB
Frea. 1KHz
:ion: Site A4 1285 Georgetown Street
Site Map on Back of Sheet
106
engineering dynamics, nc
-------
Community Noise Analyzer
Data Sheet
Job No. EPA- 2 28
Date: 7-20-78
Sheet 2
of 3
Test Data
Check List
Switch
Up
Switch
Down
Run No .
Dur . Hrs .
From
To
L Value
Max
.1
1
10
50
90
99
Min
. 5/24
1/24
8/24
. 5/8
2
5
20
Eq
Dn
•i
/ • C^j
// -V6
/*.. 46
!Zx^
fc ~
0 C>
L '""&
.-- , ---
••' ^.
.--/
f o
yz.
J- 7
-^ c-
c— -=/
$-_--.
Remarks 1
Site Local
i.—
/ O
^y /^
•'^"•f^
^xCT
£p - "^
^ -L-
5~&
- ' "7
J5"<^
_'7r-
^y-
'r'J
5" 71
n^"
xf C
/- /<_
<<
I • C>
/r-^' :v
/ e- /' ^ ;^>
^^"^^d
<£ /
&-O
--. "^I
J-'"fc
j5 ,^
-V
-"0
^t
-5~&
JT"_7
J^~ -^
jr y
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting
Fast Slow
Data Erase
Cal.
Altitude 152.4m
y$
\
1
j
Aj
j
I
IX 1
Set Time
Clock Starts \
Start Clock
Set Time Run P~
Begins 1
Enable Run
Display Off
1
Time Left Site i
By : LG
Remarks 3 Some Package Noise
Remarks 2 Calibrator GR
93=70 dB Cal. Level 93= /O dB
Thunder 1:40 run stopped-thunder Freq. iKRz
:ion: storm-Run started after Storm
Site A4 1285 Georgetown Street
Site Map on Back of Sheet
107
engineering dynamics, nc
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date:_
Sheet
7-20-78
of
Test Data
Check List
Switch
Up
Switch
Down
Run No.
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
/
/, C
* .'*£
'- '' 5c
5" C
-V 7
'/ -~>
£'7
^r_>
6" 3
5" 3
Remarks 1 Batteries fail
middle of run Rep/ACC
batteries
/-
/. T--
L-.-Zf-
7 , J^
^x^
c- z.
t A
*-?
.•5'c
5" 3
.-., /
-5-c.
-5~-
-------
Site 5_
Site 5 was located on the C. U. Campus near the tennis court
area at the intersection of 28th and Baseline. It was at this
site that most of the research was conducted during the develop-
ment of the aerial package and measurements techniques. Flights
to altitudes as high as 305 meters at night were conducted before
it was found our that such flights may have been in violation of
Federal Air Regulations.
Site 5
Date Run No. Time Duration
4-12-78 1 06:07-07:07 1
4-12-78 2 07:10-08:10 1
4-12-78 3 08:40-09:40 1
4-12-78 4 09:41-10:41 1
4-12-78 5 11:42-11:42 1
4-12-7.8 6 12:01-13:01 1
4-12-78 7 13:03-14:03 1
4-12-78 8 14:05-15:05 1
4-12-78 9 15:26-16:26 1
4-12-78 10 16:28-17:28 1
4-12-78 11 17:30-18:00 0.5
7-19-78 1 05:40-06:40 1
7-19-78 2 07:28-08:28 1
7-19-78 3 08:30-09:30 1
7-19-78 4 09:32-10:32 1
7-19-78 5 11:05-12:05 1
7-19-78 6 12:11-13:11 1
7-19-78 7 13:29-14:29 1
7-19-78 8 14:32-15:32 1
7-19-78 9 17:03-18:03 1
7-19-78 10 18:05-19:05 1
7-19-78 11 19:20-20:20 1
109
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date; 4-12-7B
Sheet 1 of
Test Data
Check List
Switch
Up
Switch
Down
Run No.
Dur .Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Bn
/
l-o
6-07
7.01
^xc^l
6S
6 7
& 3
£ 2.
6O
sr&
5~7
J-6
63
(?Z-
&
64
C
^va
~69
£9
66
6^r
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux Aux
Weighting A
Fast Slow Slow
Data Erase
Cal. 94=70 dB
Altitude 152.4m
Set Time
Clock Starts [~
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By:
Remarks 1 9:36 Balloon Rooled Over
Remarks 2 Construction Noise @ Calibrator
nearby overpass - air hammer Cal. Level ^4=/u ats
Freer.
:ion: CU Campus - Base line @ 28th
Site Map on Back of Sheet
110
engineering dynamics, inc
-------
Community Noise Analyzer
Job No. EPA- 2 28
Date:4-12-78
Sheet 2 of 4
Data Sheet
Test Data
Check List
Switch
Up
Switch
Down
Run No .
Dur.Hrs .
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ecr
Dn
1
/•G
<7>'^/
l°£L+
71
7.3
7 2,
£ .&
/o. i
"iZ^xd
6 &
£7
t>±-
£2,
63.
(BO
*~?
^8
&^
£4
&•*>
&£-
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux Aux
Weighting A
Fast Slow
Data Erase
Cal. 94=70 dB
Altitude 152.4m
Set Time
Clock Starts |
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By:
Remarks 3
Remarks 2 10:45 -wind picking up Calibrator
Cal. Level 94=7U dB
Fred. 1KHz
:ion: Site A5 CU Campus - Field near tennis courts; Intersection
of Baseline and 28th
Site Map on Back of Sheet
111
engineering dynamics, nc
-------
Community Noise Analyzer
Data Sheet
Job No. EPA- 228
Date; 4-12-78
Sheet 3
of
Test Data
Check List
Switch
Up
Switch
Down
Remarks 1
Construct
Run No.
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ed
Dn
ion Noise
Remarks ;
7
J.o _,
/^•03
'^.'05
^x^
7/
7/
67
<£> 4
frZ,
^ O
5~?
~£~&
<66
/S-,'oS~
"^XC^
70
&
5~
6 -f-
6^f
<^^
^xL
7
1 0
/-s-.'z-k
/6,'Z,4>
"^>~eC^
77
7^~
-7(
64
5~^
^ S
6 5
^•-^
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date; 4-12-78
Sheet 4
of
Test Data
Check List
Switch
Up
Switch
Down
Run No .
Dur .Hrs .
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
/O
/' O
/6! 2 ft
/7/Z.B
^xd[
<6 ~7
<£> 7
& t>
<^3
z_
£>!
4
^3
61
<£>£>
£~ 2^
£ Z-
^^xdC
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting
Fast Slow
Data Erase
Cal.
Altitude
Set Time
Clock Starts |
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By:
Remarks 3
Remarks 2 Calibrator
Cal. Level 94=70 dB
Freq. 1KHz
:ion: site A5 CU Campus - Field near tennis courts;
Intersection of Baseline and 28th
Site Map on Back of Sheet
113
engineering dynamics, he
-------
i
Switch
Up
Switch
Down
Community Noise
Data Sheet
Test Data
Run No.
Dur .Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Kin
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
/
/.£>
£-.•10
& wo
^<"
67
6 6
<£> 3
& o
5 7
£"2.
5~0
4&
1
& 2-
<&/
s-9
tr&
6S-
64
G, 3
&Z-
J
/. O
8 .30
9; 3o_
&9
&&
6-6
fr 3>
6 1
6G
jr-S
S~7
£S~
6
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date: 7-19-78
Sheet 2
of 4
Switch
Up
Switch
Down
Remarks 1
Run No .
Dur .Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
Remarks
Test
4
1, 0
9''2>*L
/O;32^
]^xd"
& &
/Jo o
<2>-s-~
6 5
& 1
&a
•s-p
* &
(r~t 7^
S ^J
£- £_
<£> I
2
Data
^5
/. 0
ll;os~
IllOf
^^xCT
68
£ &
& -$-
6 3>
61
£> O
^5~?
6~~&
Z-
e
/. o
/z -n
13! /I
^>-
-------
Job No. EPA 228
Community Noise Analyzer
Data Sheet
Date; 7-19-78
Sheet 3
of
Test Data
Check List
Switch
Up
"h*
Switch
Down
Remarks 1
Run No.
Dur .Hrs .
From
To
L\r-> 1 110
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ea
Dn
Remarks
7
A 0
/_?.'*/
<£> 2>
6ZL
2
g,
/' &
/•7/32_
tf~,'32^
~^X^
*~~^ ^~-^
-7Z-
-70
& 7
61
60
j-p
5~<£
£~
&y
(bH~
<£> A.
9
f.G
I&1G3
"^xd
<£><£>
•*-<$
6 s~
&4
G> 3
<£> 5L
Remarks :
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting A
Fast Slow
Data Erase
nal.
Ali-itude 152.4m
Set Time
flock Starts
Start Clock
Set Time Run
Begins
Knable Run
Display Off
Time Left Site
By: LG
Calibrator
Cal. Level 93=70 dB
Frea. 1KHz
X
Site Location
TTT Campus
Site Map on Back of Sheet
engineering dynamics, he
-------
Switch
Up
Switch
Down
Community Noise
Data Sheet
Test Data
Run No .
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ecr
Dn
/C
t.O
/S'OS
1? •OS'
^>—=cr
7B
SI
72-
6 3
&> /
£0
5~<3
j$— 7
(2) &
4
6 Z-
C"* ^>
Remarks 1 Sirens - 6:56,
7:04
Site Local
II
ho
i
f
^xcC
Job No. EPA-228
Date: 7-19-78
Analyzer Sheet 4 of 4
Check List
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting
Fast Slow
Data Erase
Cal.
Altitude 152.4m
X
A
X
Set Time
Clock Starts I
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By: LG
Remarks 3
Remarks 2 Calibrator
Cal. Level 93=70 dB
Frea. 1KHz
:ion: A 5 CU Campus
Site Map on Back of Sheet
engineering dynamics, he
-------
Site 6_
Site 6 is located next to Maxwell Lake in the northwest area
of Boulder. This is a quiet residential area located about one
block west of Broadway, and north of Linden Avenue.
Site 6
Date Run No. Time Duration
3-30-78 1 06:45-07:45 1
3-30-78 2 07:48-08:48 1
3-30-78 3 09:01-10:01 1
3-30-78 4 10:19-11:19 1
3-30-78 5 11:20-12:20 1
3-30-78 - 12:20-14:03 Aborted
3-30-78 6 14:03-15:03 1
3-30-78 7 15:03-17:00 Aborted
3-30-78 '8 17:00-18:00 1
7-27-78 1 05:50-06:50 1
7-27-78 2 06:51-07:51 1
7-27-78 3 08:12-09:12 1
7-27-78 4 09:32-10:32 1
7-27-78 5 10:39-11:39 1
7-27-78 6 11:41-12:41 1
7-27-78 7 13:07-14:07 1
7_27-78 8 14:12-15:12 Aborted
1-21-18 9 14:46-15:46 1
7-27-78 10 15:48-16:48 1
7-27-78 11 16:49-17:49 1
7-27-78 12 18:03-19:03 1
7-27-78 13 19:04-20:04 1
118
-------
Switch
Up
Switch
Down
Community Noise
Data Sheet
Test Data
Run No .
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
. 5/8
^
t.
5
20
EQ
Dn
t
1*0
(o^3
2j^^
67
& 7
/, 0
9 -or
JO: Of
6 i
6 /
^9
5-6
y*
-5V
46
4 7
5 8
57
55
54
Job No. EPA-228
Date: 3-30-78
Analyzer Sheet 1 of 3
Check List
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting
Fast Slow
Data Erase
Cal.
Altitude
Set Time
Clock Starts I
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By:
Remarks 1 See Remark # 2
Remarks 2 Heavv Machinery and Calibrator
aeneral construction noise thru Cal. Level 94=70 dB
out Freq. 1KHz
:ion: Maxwell Lake
Site Map on Back of Sheet , -,„
engineering dynamics, nc
-------
Switch
Up
Switch
Down
Community Noise
Data Sheet
Test Data
Run No.
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
4
/.&
/O : 1?
//,'/?
;xc
63
63
6^
^> S
s-s-
57
49
44
6/
5?
56
5s
Remarks 1
General Construction noise
Site Locat
5
/•o
///2.CP
IZ'.ZO
^x<
68
65
^ 7
*5T
54
5C?
47
44
-5?
59
6 7
^~S>
5~*7
£-j
49
4&
47
S-7
53
S^>
S2~
~%
/, 0
&' 12.
9; J2-
&3
<£> z.
Sj
,55
53
*>£-
-S/
19
SB
•5&
££
L4
Job No. EPA-228
Date: 7-27-78
Analyzer Sheet 1 of 5
Check List
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting A
Fast Slow
Data Erase
Cal.
Altitude 152.4m
Set Time
X
X
X
X
X
Clock Starts f~
Start Clock
Set Time Run (
Begins
Enable Run
Display Off
Time Left Site
By : GS
Remarks 3 Start tape recorder 8:12
Remarks 2 Train Calibrator GR
Cal. Level 92=70 dB
Freq.
.ion: Site A 6 Maxwell Lake
Tape calibration 70 dB = -3 dB vumeter
Site Map on Back of Sheet 122
engineering dynamics, he
1
t
i
.
i
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228_
Date; 7-27-78
Sheet 1 of
Test Data
Check List
Switch
Up
Switch
Down
Remarks 1
Sl-nrt- tap
Site Local
Run No .
Dur . Hrs .
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
C /Q
. J, O
2
c,
20
Bo-
on
p side 2
Remarks
:ion: £
^
/.c
9:^^_
/&;3s2
^XC^"
^-3
6 ^
5&
5 +
S2L
5-C>
19
IS
oZ
S3
•S-JZ
52.
2
Site A6
^5—
/.a
/e. $9
t/.'39
6-3
S&
3~7
5*i
sz.
5i
4-9
-cci^
6 /
3-7%
5&
^4
5^
^$1^
^9
^3
&6
si
54
,^3
Remarks 3
L Lake Pa]
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting A
Fast Slow
Data Erase
Cal.
Altitude 152.4m
Set Time
Clock Starts
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By: GS
Calibrator GR
Cal. Level 93-70 dB
Frea. 1KHz
rk
X
K
r
1
Site Map on Back of Sheet
123
eroneering dynamics he
-------
Switch
Up
Switch
Down
Community Noise
Data Sheet
Test Data
Run No.
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
-?
h C
13-07
J4;O?
^x^1
64
feo *-^
\& i
~S~7
S3
-5"7
JC
40
60
SB
56
-Sf
Remarks 1
Site Local
&
(, o
J4.-/Z.
/S-'/Z.
7Z>-<^l
69
61
57
54
Si
49
48
*/7
^~ 7
S3
53
5 2~
Job No. EPA- 2 28
Date: 7-27-78
Analyzer Sheet 3 of 5
Check List
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting
Fast Slow
Data Erase
Cal.
Altitude 152.4m
X
A
X
Set Time
Clock Starts f~
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By: NO KR
Remarks 3
Remarks 22:26 Batteries dead Calibrator GR
Cal. Level 93=70 dB
Frecj. 1KHz
:ion: Site A6 Maxwell Lake Park
Site Map on Back of Sheet 124
engineering dynamics, nc
i
I
i
i
-------
Switch
Up
Switch
Down
Community Noise
Data Sheet
Test Data
Run No .
Dur .Hrs .
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
. 5/8
2
5
20
Ea
Dn
1C
I.O
>•$"?&
'£ ws
b>'f9
1 7.1?
"^^xcT
60
5~9
3~~?
•5~4
3~Z-
49
4&
47
-66
55
ft 3
52_
/ 2L
/• 0
I£.'O3
I^>'O3
~^==~
-------
Community Noise Analyzer
Data Sheet
Job No.
Date;
Sheet
of
Test Data
Check List
Switch
Up
Switch
Down
Run No.
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ea
Dn
13
l*Oo
j?.'ol
z.o;a4
^xC^1
<£/
eo
S6
S3
ff
49
43
Y7
S3
31
53
51
Remarks 1
Site Locat
^Xd
]^xdT
Bat Test
1st Run
2nd Run
3rd Run
Mic/A.ux
Weighting
Fast Slow
Data Erase
Cal.
Altitude 152.4m
'<
A
Set Time
Clock Starts [~~
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By: NO
Remarks 3
Remarks 2 Calibrator
Cal. Level 93~70 dB
Freq. ly
-------
Site 1_
Site 7 was located in the playground of the Whittier Ele-
mentary School and is very close to the central section of
Boulder.
Site 7
Date Run No. Time Duration
4-4-78 1 06:08-07:08 1
4-4-78 2 07:08-08:08 1
4-4-78 3 08:08-09:08 1
4-4-78 4 09:12-10:12 1
4-4-78 5 10:15-11:15 1
4-4-78 6 11:32-12:32 1
4-4-78 7 12:34-13:34 1
4-4-78 8 13:38-14:38 1
4-4-78 9 14:55-15:55 1
4-4-78 10 15:57-16:57 1
4-4-78 11 17:00-18:00 1
7-24-78 1 06:15-07:15 1
7-24-78 2 07:28-08:26 1
7-24-78 3 08:27-09:27 Aborted
7-24-78 4 09:37-10:37 1
7-24-78 5 10:42-11:42 1
7-24-78 6 11:54-12:52 1
7-24-78 7 12:59-13:59 1
7-24-78 8 14:17-15:17 1
7-24-78 9 15:20-16:20 1
7-24-78 10 16:23-17:23 1
7-24-78 11 17:50-18:50 1
7-24-78 12 18:51-19:51 1
127
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date; 4-4-78
Sheet 1 of
Test Data
Check List
Switch
Up
Switch
Down
Remarks 1
Run No.
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ed
Dn
Remarks
1
1
C.-OS
T- O'S
^xT
0,1
6
5~(.
2
2-
/
7:0?
S: OS
^Xl"
ta.
C 1
r-«cm
62
(i /
V C*
c~ fi
5-£
r?
rr
Jj-
60
sf
yfl
^S1
Remarks 3
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux Aux
Weighting A
Fast Slow Slow
Data Erase
Cal. 94=70 dB
Altitude 152.4m
Set Time
Clock Starts
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By: SR and GS
Calibrator 94=70 dB
Cal. Level
Freq. 1KHz
r
Site Location:
Whittier School
Site Map on Back of Sheet
^28
engineering dynamics, he
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date:
Sheet
4-4-78
of 4
Test Data
Check List
Switch
Up
Switch
Down
Run No .
Dur .Hrs .
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
EQ
Dn
'i
i
9'ii
10' i*
^xCT
£7
cs
Cl
fi
s~s
s~v
5*2
i 0
Go
6t?
5-$
5-7
Remarks 1 Still Air
5-
\
/G- /r
II if
^xc^
Ci
s~c
fi
? 1
•V5-
J6-
?o
£ $
? 3
?-2.
^S
^77
C
I
11 T*
12.: J"i
~^xz^
6 7
(,(,
<*3
GO
i 1
ry
5-7
J^6
<£2
HI
6»
5~^
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting A
Fast Slow
Data Erase
Cal. 94=70 dB
Altitude 152.4m
X
Set Time
Clock Starts |
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
—
x
By: SR anrl Rfi
Remarks 3 Still air Recess for school
Remarks 2 Possibly bad cable to Calibrator
CNA repaired Cal. Level 70 dB
Freq. 1000 Hz
Site Location: Whittier Elementary School
Site Map on Back of Sheet
129
engineering dynamics, nc
-------
Community Noise Analyser
Data Sheet
Job No. EPA-228
Dato; 4-4-78
Sheet 3 of
Test Data
Check List
Switch
Up
Switch
Down
Run No .
Dur .Hrs .
From
To
L Value
Max
.1
1
10
50
90 _j
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
—r
\
'£• 7f
U 'ft
|!X^
£ 7
£c>
6 f
Go
6 ••?
F7
-F-7
5-£
6?
£ /
6c
•5"*?
Remarks 1
Site Locat
9
/
IT: 3$
W.3?
Hx^I
6 5~
6f
£ 5
57
F6
651
6iL
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date: 4-4-78
Sheet 4
of
Test Data
Check List
Switch
Up
Switch
Down
Remarks 1
Run No.
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ed
Dn
Remarks
10
!
IT- i~7
J 6 !>- 7
^xCT
75
72
£ 7
0 :T
6:2.
CO
5-9
i~7
6 6
6 6
6 3
6-?
2
I /
/
17- OO
IS1-- oo
~^xcT
6^/
6^
6/
60
-T?
5-7
iC-
ri~
61
GO
5-^1
5"8
"^rx^I
Remarks 3
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weiqhtinq
Fast Slow
Data Erase
Cal.
Altitude
Set Time
Clock Starts
Start Clock
Set Time Run
Beqins
Enable Run
Display Off
Time Left Site
By:
Calibrator
Cal. Level
Frea.
r
Site Location:
» Site Map on Back of Sheet
131
enineering dynamcs, inc
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Dato; 7-24-78
Sheet 1 of
Test Data
Check List
Switch
Up
Switch
Down
Run No.
Dur.Hrs.
From
To
L Value .
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ect
Dn
i
1
(t . if
7- IT
>i
&?
<*\
5-$
5-5-
^T
57
(e7
Ci
6C?
Go
Remarks 1
Site Locat
*•
1
7: 2.6
S- ~t
^xc
67
(,(,
GS-
(*3
60
5"!
*~8
5-7
6s-
6?
6i
(e(
J
1
P.'C?
1:27
^x^
•
A/0
Dfttft
'
Bat Test
1st Run
2nd Run
3rd Run
Mic/Airx
Weighting A
Fast Slow
Data Erase
Cal.
Altitude 152.4m
X
X
X
Set Time
Clock Starts |~
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
—
By: GS
Remarks 3 Batteries Died
Remarks 2 Calibrator GR
Cal. Level 92=70 dB
Freer. 1KHz
:ion: Site A 7 Whittier School
Site Map on Back of Sheet
-^32
engineering dynamics, nc
-------
Community Noise Analyser
Data Sheet
job No. 228-EPA
Date; 7-24-78
Sheet 2 of
Test Data
Check List
Switch
Up
Switch
Down
Run No .
Dur .Hrs .
From
To
L Value
Max
.1
1
10
50
90
99
Win
^5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
-V
1
-<^
6*r
6"^
(i i
Go
rs
5-7
5~6
s~t>
Gz
a /
G«>
5t?
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weiahtinq A
Fast Slow
Data Erase
Cal.
Altitude
X
X
Set Time
Clock Starts 1
Start Clock
Set Time Run
Becrins
Enable Run
Display Off
Time Left Site
Bv: GS and KR
Remarks 3
Remarks 2 Plane 11:35 Calibrator GR
Cal. Level 93-70 dB
Frea. 1KHz
tion: Site A7 Whittier School
Site Map on Back of Sheet
133
engineering dynamics, nc
-------
Svitch
Up
Switch
Down
Community Noise
Data Sheet
Test Data
Run No .
Dur .Hrs .
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ea
Dn
7
1
1 1 '- 5"M
1 ? . Jff
^xd
6C,
C-i
C, 2.
40
s-a
5-C,
5-S-
rr j
C/
Go
5^
s-*
Remarks 1
Site Locat
s
1
1*1 : 17
if: 17
^x^
77
7T
iS
»«=C^
&^
c^
61
60
5~S
T7
FC
>~r
63.
<;-(
5"^
3-3
Job No. EPA- 2 28
DntP: 7-24-78
Analyser Sheet 3 of 4
Check List
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
VJeiqhtinq A
Fast slnvj
Data Erase
Cal.
Altitude
X
X
Set Time
Clock Starts l~"
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By. KR and LG
Remarks 3
Remarks 2 p°o1 Announcement ^:^ Calibrator GK
Cal. Level 93=70 dB
Freq. 1KHz
:ion: Site A7 Whittier Elementary School
Site Map on Back of Sheet 134
engineering dynamics, nc
-------
Job No. EPA-228
7-24-78
Community Noise Analyser
Data Sheet
Sheet
of
Test Data
Check List
Switch
Up
Switch
Down
Run No .
Dur.Hrs .
From
To
L Value
Max
.1
1
10
50
90
99
Min
. 5/24
1/24
8/24
. 5/8 ^
2
5
20
Eq
Dn
1C
1
IG 'I?
17: -2.J
bxc^
6S-
(el
<*2.
Go
C-T
i"^
5-7
rc
5~t
5-J
6;
6&
5-S
5-S
Bat Test
1st Run
2nd Run
3rd Run
Mic/A_uj£_
Weighting
Fast Slow
Data Erase
Cal.
Altitude 152.4m
X
A
X
Set Time
Clock Starts 1
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
Bv . LG and NO
Remarks 3
Remarks 2 Calibrator
Cal. Level
Frea.
tion- A7 Whittier Elementary School
Site Map on Back of Sheet
135
engineering dynamics, me
-------
Site 8_
Site 8 was located too close to the Boulder Airport
according to the F.A.A. for flight at 500 ft; flights at 200 ft
were authorized but this altitude is too low to gather any
meaningful data. No data was collected at this site.
136
-------
Site 9.
Site 9 is located west of the University of Colorado Campus
at 1000 Rosehill Drive which is a residential area.
Site 9
Date Run No. Time Duration
4-6-78 1 06:00-07:00 Aborted
4-6-78 2 07:10-08:10 1
4-6-78 3 08:12-09:12 1
4-6-78 4 09:40-10:40 1
4-6-78 5 10:42-11:42 1
4-6-78 6 11:44-12:44 1
4-6-78 7 13:03-14:03 1
4-6-78 8 14:05-15:05 1
4-6-78 9 15:27-16:27 1
4-6-78 10 16:27-17:27 1
4-6-78 11 17:32-18:32 1
7-31-78 1 06:27-07:27 1
7-31-78 2 07:32-08:32 1
7-31-78 3 08:35-09:35 1
7-31-78 4 10:00-11:00 1
7-31-78 5 11:00-12:00 Aborted
7_31_78 6 12:00-13:00 Aborted
7-31-78 7 13:38-14:38 1
7-31-78 8 14:40-15:40 1
7-31-78 9 15:58-16:58 1
7-31-78 10 17:00-18:00 1
7-31-78 11 18:12-19:12 1
7-31-78 12 19:15-20:15 1
137
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date: 4-6-78
Sheet 1
of 4
Test Data
Check List
Switch
Up
Switch
Down
Run No . 1 /
Dur.Hrs.! /•&
From
To
L Value
Max
.1
1
10
50
90
99
Win
.5/24
1/24
8/24
. 5/8
2
5
20
Eq
Dn
&.'&Q
7. co
PXC^
1
•\i ~
-7>,-,rA
\
j
i
1
,
j
i
Remarks 1 Aborted
Site Locat
£.
/ .0
7--/0
8 ' (0
^2>r^
^
I. O
e; > IL
? ;iz-
"]^>~
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228,
Date: 4-6-78
Sheet 2 of
Test Data
Cheok List
Switch
Up
Switch
Down
Run No .
Dur .Hrs .
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
•^
/. o
9'4o
/<3>'4O
]^XC^
/^2_
tf ''•?£-
J^^d"
67
6 5
CoC
-5"~5
r5^
50
^^
i T
£8
SA
^~4
S3
&
1,0
W44
£-$
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date:
Sheet
4-6-78
of
Test Data
Check List
Switch
Up
Switch
Down
Remarks 1
Run No.
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
. 5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
Remarks *
•7
AO
73/03
/'*/,'O3
^xdT
62.
5"?
5 +
52.
50
^9
48
47
•^~¥
53
Si
51
->
&
/• O
14,'OiT
AST /£55-
3!xC!
^"•f
& o
56
5 3
£c>
1-9
43
47
57
5*
sz.
-5 /
^
/ 0
/^-. 27
/<^> 2-7
~^xZ^
62-
<&G
S 7
5^_
5C1
19
^•fi
39
-56
-5"^
sy
S/
Remarks 3
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux Aux
Weighting A
Fast Slow Slow
Data Erase
Cal. 94=70 dB
Altitude 152.4m
Set Time
Clock Starts
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By:
Calibrator 94=70 dB
Cal. Level
Freq.
r
Site Location;
Site Map on Back of Sheet
140
engineering dynamics, nc
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date: 4-6-78
Sheet 4 of
Test Data
Check List
Switch
Up
Switch
Down
Remarks 1
Run No .
Dur .Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
Remarks
1C
/>&
/£.'27
/7-27
^xcT
<£O
SB
5 5
5 2^
SO
4-9
4-Z
ifi
s4
53
XI
.-?/
2
77
«-S-
/ 7 •' 3 ^
/C?/0%.
~^>«-eCm
Remarks "
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weiahtina
Fast Slow
Data Erase
Cal.
Altitude
Set Time
Clock Starts
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
Bvt
Calibrator
Cal. Level
Freer.
Site Location:
Site Map on Back of Sheet
141
engineering dynamics: nc
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-223
Date; 7-31-78
Sheet 1 of
Test Data
Check List
Switch
Up
Switch
Down
Run No .
Dur .Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
. 5/24
1/24
8/24
. 5/8
O
^
5
20
Ed
Dn
/
ho
<£'-'^'7
7/27
57
-55
52.
Sc
46
*£
+i
4 +
SI
50
49
4-&
Remarks 1 Plane 6:35
Siren 6:36, 7:14
Site Local
z.
1-0
V."3Z_
G -• 3Z
~^>
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date:J-31-78
Sheet 2 of
Test Data
Check List
Switch
Up
Switch
Down
Run No .
Dur .Hrs .
From
To
L Value
Max
. 1
1
10
50
90 j
99
Min
.5/24
1 /24
8/24
. 5/3
2
5
20
EQ
Dn
72ml
i.'o
&:c->c>
\n^&^,
6^-
63
L_^Z_
£.5
£<
to
52_
JS^^
*~5lT~
L£±.
6^_
t-5-S«~__—
Remarks 1 .Sudden brisk
•wind balloon movement
erratic Abort Run
-5""
*^>-cC^
,
£
"^x^7
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting
Fast Slow
Data Erase
Cal.
Altitude 152.4m 1
X
?\
Set Time
Clock Starts 1
Start Clock
Set Time Run
Beains
Enable Run
Display Off
Time Left Site
I —
Bv:
Remarks 3 Windy
-
Remarks 2 Windy Calibrator
~ '" " Cal. Level 93=70 dB
Frea. 1KHz
Site Location: A9 1000Rosehi_ll_Drive_
Site Map on Back of Sheet
143
iineering dynamics nc
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date; 7-31-78
Sheet 3 of
Test Data
Check List
Switch
Up
Switch
Down
Run No .
Dur .Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
•7
i too
I313&
14, 35
^x^I
65~
62-
£6
53
Si
"^9
4&
4~7
St>
S~4
fz,
5~l
Remarks 1 Smooth Flicjht
&
1-0
14140
l&lo
"^x^i
62.
£ 1
~s~9
^5~
3~f
A1
46
^&
^6
fi
3~JL
9
'/,&
I5~>'5~&
J6>;^3
~^>-
-------
Community
Noise Analyzer
Job No.
Date: 7
Sheet
EPA- 2 28
-31-78
4 of
4
Data Sheet
Test Data
Check List
Switch
Up
Switch
Down
Run No .
Dur .Hrs .
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
. 5/8
2
5
20
Ea
Dn
/o
f.o
1 7.'Oo
13 '-&o
I^XCC
6 1
5~G
*s~~s~
-5~Z_
jj £J
/ICb
1&
47
3-3
5~2-
J~/ ^
^O
Remarks 1 Unidentinea
noise 5:03; Raise Balloon
from 137. Ibm to lb/.4m
Site Local
//•
1,0
18> / 2,
1 ^f ' / "^?
T^xT
^ mf2
5-7
~5~4
3~^
3~&
19
4&
$7
5~3
-5^2_
S~/
5~O
12-
1,0
/-
~^7
*5~3
5^
4&
47
4
-------
Site 10
Site 10 was located at Baseline Road and Foothills Parkway
which is at the southeastern edge of Boulder.
Site 10
Date Run No. Time Duration
4-10-78 1 06:08-07:07 1
4-10-78 2 07:10-08:10 1
4-10-78 3 08:19-09:19 1
4-10-78 4 09:21-10:21 1
4-10-78 - 10:21-12:15 Aborted
4-10-78 5 12:15-13:15 1
4-10-78 6 13:45-14_45 1
4-10-78 7 15:00-16:00 1
4-10-78 8 16:02-17:02 1
4-10-78 9 17:05-18:05 1
7-26-78 1 08:30-09:30 1
7-26-78 2 09:32-10:32 1
7-26-78 3 10:33-11:33 1
7-26-78 4 11:34-12:34 1
7-26-78 5 12:54-13:54 1
7-26-78 6 13:55-14:55 1
7-26-78 7 14:58-15:58 1
7-26-78 8 16:12-17:12 1
7-26-78 9 17:14-18:14 1
7-26-78 10 18:29-19:29 1
7-26-78 11 19:30-20:30 1
146
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date: 4-10-78
Sheet 1
of
Test Data
Check List
Switch
Up
Switch
Down
Remarks 1
Run No .
Dur .Hrs .
From
To
L Value
Max
. 1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ed
Dn
/
Lo
6<'Gf~
~7:c£
& 4
6$ \
6 Z-
6?0
5-7
3~e
s^
•5~Z-
61
6O
3~9
523
Still Air
Site Loca
2.
/•o
7i/0
Bl 10
"^xc^
&5T
£4
<£"O
J?
^'7
^S~
3^
**t
&<2
S?
S&
-^7
3
L n
&:i9
9;/ 2-
£0
5~7
3~<6
^^
^3
6/ '
^O
^9
^Q
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux Aux
Weiahtina A
Fast Slow slow
Data Erase
ral. 94 70 dB
Altitude 152. 4tn ^
Set Time
Clock Starts I
Start Clock
Ret Time Run
Begins .. _
Enable Run
Display Off
Time Left Site __ .
By: SR and GS
Remarks 3 Cloudy
p^T-Vs 2 Calibrator .. _
ral. Level 94-70 dB
Freq. . _ .
tior- Baseline and Foothills Parkway
Site Map on Back of Sheet
147
engineering dynamics, inc
-------
Job No. EPA- 2 28
Date: 4-10-78
Community Noise Analyzer Sheet 2 of 3
Switch
Up
Switch
Down
Data Sheet
Test Data
Run No .
Dur.Hrs .
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
EC?
Dn
*
>'/I5
•><.<: &&. -f-c^ <-^ //f c-/ed.
Site Map on Back of Sheet
engineering dynamics, he
i
-------
Community Noise Analyzer
Data Sheet
Job N
Date :
Sheet
4-10-78
of
Test Data
:heck List
Switch
Up
Switch
Down
Run No .
Dur.Hrs .
From
To
L Value
Max
.1
1
10
50
90
99
Min j
.5/24
1/24
8 '24
. 5/8
o
^
q
20
EC
Dn
7
ho
&oo
)6 !&a
^x^
«£<-
6z.
*-9
s-a
S~7
£-6
S~3~
4-7
trv
ft
^B
3-7
Remarks 1 93 dB CNA=70dB
GR Cal and GLR
Snow Stops
B
>' O
16 :G-Z.
/7;&t
^x^
&>£>
65-
&/
^~&
-5-7
f£
^
&/
^9
^S
^7
&
/• o
I7;&s-
]l& : &£~
~^>-
-------
nity Noi se Analyzer
^ Vl
Job No. EPA-228
Date:
Sheet
7-26-78
of
Test Data
Check List
Switch
Up
Switch
Down
! Run No „
Dur . Hrs .
Fronr;
i- _/_
r^.^1
To J9V 3O
L Value- P^-^C^*
Max
?p_-
.1 \ /3a
f:C/3z
| ^3
/•',_C^
/(P/33
X//3-3
[^~7 i
^S~-5~
^ 3
^ 3
&£.
£->&
$~9
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
V^eighting
Fast Slow
Data Erase
Cal.
Altitude 152.4m
x!
a,
y.
Set Time
Clock Starts [~
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
Bv : LG and GS
—
—
Remarks 3
ReT-.arks 2 Calibrator °
Cal. Level 92=70 dB
Freq. 1KHz
-ion :c i i-_p
TXT n B;==«=line and Foothills; Chateu Village West Apts.
Original site being caved over - .new highway construction
Site Map on Back of Sheet
151
engneerng dynamics, nc
-------
Job No.
EPA-228
Community Noise Analyzer
Data Sheet
Date; 7-26-78
Sheet 2 of
Test Data
Check List
Switch
Up
Switch
Down
Run No.
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ea
Dn
4
1, 0
///3/
/Z/3-/
^<-
SK
B6T
73
ez-
4T9
^7
jrJ~
3-7
<£6
64
&o
6Z>
Remarks 1 Lawn Mower
11:47 Siren
s~
/. c
tz*'&4
\/3,'sy
•><:
70
6?
ZS'
6/
tr?
J-7
^T6
^JT
64
&3
6>Q
60
6
t-o
/3.£^3-
t4! i $~
"rx:
~7t
7C>
&£
£&
S&
&>
^5-
&
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting
Fast Slow
Data Erase
Cal.
Altitude 152.4m
X
A
Set Time
Clock Starts 1
Start Clock
Set Time Run
Beqins
Enable Run
Display Off
Time Left Site
By: DM and KR
Remarks 3
Remarks 2 Calibrator GR
Cal. Level 92=70 dB
Freq. 1KHz
Site Location: Site A10 Baseline and Foothills
Site Map on Back of Sheet
152
engineering dynamics, he
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Datf>: 7-26-78
Sheet 3
of
Test Data
Check List
Switch
Up
Switch
Down
Remarks 1
Run No .
Dur .Hrs .
From
To
L Value
Max
.1
1
10
50
90
99
Win
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
7
I'O
tfitt
/s-,'s&
^xd"
71
7C*
<££=
(b z-
^-^
5~7
5~&
^
GS'
63
61
<£>&
Site Loca
&
f.c>
/6Si~Z-
17: /z-
^xcT
6?
<£>£>
62>
Z-
6i
&&
y
i ,0
17; iy
1&_^4
6<£>
6 7
6J^
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date: 7-26-78
Sheet 4 of
Test Data
Check List
Switch
Up
Switch
Down
Remarks 1
Run No .
Dur .Hrs .
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ecr
Dn
Remarks
10
)• o
I81Z9
l$,z?
^x^
<£-5~
£•4
5~7
^~^
£~3
J5~3 j
£>/
<£>o
5-8
~s~~?
2
//
1,0
I?-'3>C>
zcv;?c>
"^XCT
<£>&
(b^
£/
? B
S~£
•3~£
-5~3
-S'Z-
^9
5~~£
-5"?
5~&
~^ixd
Remarks 1
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting
Fast Slow
Data Erase
Cal.
Altitude 152.4m
Set Time
Clock Starts
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By: NO
Calibrator GR
Cal. Level 92=70 dB
Frea. 1KHz
X
A
i —
Site Location: AlO Baseline and Foothills
Site Map on Back of Sheet
154
engineering dynamics, nc
-------
Site 11
Site 11 is located at Martin Park which is at the very
south end of Boulder.
Site 11
Date Run No. Time Duration
4-7-78 1 05:52-06:52 1
4-7-78 2 06:54-07:54 1
4-7-78 3 08:26-09:26 1
4_7_78 4 09:28-10_28 Aborted
4-7-78 5 10:28-11:28 1
4-7-78 6 11:56-12:26 0.5
4_7_78 7 12:41-13:11 0.5
4_7_78 8 13:14-13:44 0.5
4-7-78 9 13:47-14:17 0.5
4_7_78 10 14:23-14:53 0.5
4-7-78 11 15:07-16:07 1
4_7_78 12 16:09-17:09 1
4-7-78 13 17:10-18:10 1
7-28-78 1,2,3 06:00-09:45 Aborted
7-28-78 4 09:45-10:45 1
7-28-78 5 10:55-11:55 1
7-28-78 6 11:56-12:56 1
7-28-78 7 13:00-14:00 Aborted
7_28-78 8 14:41-15:41 1
7_28-78 9 15:42-16:42 1
155
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date; 4-7-78
Sheet 1
of
Test Data
Check List
Switch
Up
Switch
Down
Run No.
Dur .Hrs.
From
To
L Value ^
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
EQ
Dn
1
i
5- i-l
C
Remarks 1 Still Air
2-
!
6 >v
T.SH
^XT"
&?
-------
Switch
Up
Switch
Down
Community Noise 1
Data Sheet
Test Data
Run No .
Dur . Hrs .
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
. 5/8
2
5
20
Ed
Dn
LI
!
c\ -zs
(O'iS
Remarks 1
5-
1
IO 2-S
i( iS
^xc!
6V
6?
6<
S-(j
51
S'L
5-5-
«•/-cC^
/6o)
f-f'/)
(^1
(f: )
(5"C)
(5T)
(T^tj
• (^ )
(58)
(5-S)
( ST6)
( FG)
Job No. EPA- 2 28
Date: 4-7-78
Analyzer Sheet 2 of 5
Check List
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux Aux
Weiahtina A
Fast Slow slow
Data Erase
Cal. 94 7U dB
Altitude
Set Time
clock Starts 1 _
Start Clock
Set Time Run
Beains
Knsble Run
Display Off
Time Left Site
Rv. SR and GS
tsv .
Remarks 3 Traverse to 304.8m then ^ srar
Still Air
Remarks 2
Calibrator
Cal. Level
Freq
Site Map on Back of Sheet
j_57
engineering dynamics he
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228_
Date; 4-7-78
Sheet 3 of
Test Data
Check List
Switch
Up
Switch
Down
Run No.
Dur .Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Win
.5/24
1/24
8/24
.5/8
2
5
20
Eq
Dn
7
O.T
li H!
I? li
Ix^
c-t
(,3 J
SI
S"f
•fl
IS
ft
Hi
fs
bC
?J
5Z
Remarks 1 Altitude
travers 19.2m
s
O.r
ir-if
J-T'Vr
*~^X^"
<*7
(,(,
Gi
si
sc
SI
51
So
(,3
(,i
FS
S?
A
O.r
\3-i7
11 17
"^>-<^
7-V
7l_
fc-r
Co
fS
?(.
s?
Si
(,T
(?l
Ho
S<1
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weiahtino
Fast Slow
Data Erase
Cal.
Altitude
i
Set Time
Clock Starts 1
Start Clock
Set Time Run
Beains
Enable Run
Display Off
Time Left Site
Bv: RD
Remarks 1 Aitituae rravers ,o.^»
Remarks 2 Altitude Travers JB.im calibrator
Cal. Level 94=70 dB
Frea. 1KHz
Site Location:
Martin Park
Site Map on Back of Sheet
158
engineering dynamics, nc
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228_
Date: 4-7-78
Sheet 4 of
Test Data
Check List
Switch
Up
Switch
Down
Remarks 1
Run No .
Dur .Hrs .
From
To
L Value
Max
1
• _L
1
10
50
90
99
Min
.5/24
1724
3 '24
.5/8
2 i
5
20
Eq
Dn
Remarks
i 0
C- f
/T.- ~?
I 7- . 5J-
K^^^
C sr
£ ?~
C-i
0 D
i~S
5-7
yr
f s~
6/
(J/
^"V
^/
2
/
! J ' D 7
/ 6 ' c ' 7
"^x^
i^
/ i
/
l» 0":
17 -'C"1
'~^>-
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date:
Sheet
4-7-78
of
Test Data
Check List
Switch
Up
Switch
Down
Run No.
Dur.Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ea
Dn
i?
1
\7't°
\S'io
^X^"
6>z
(*l
Cl
Si
sS
5-7
ST
ff
'/
do
ft
5$
Remarks 1
Site Locat
^xCT
Il^x^
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting
Fast Slow
Data Erase
Cal.
Altitude
Set Time
Clock Starts |
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By:
Remarks 3
Remarks 2 Calibrator
Cal. Level
Freer-
ion:
Site Map on Back of Sheet
160
engineering dynamics, inc
-------
Community Noise Analyzer
Data Sheet
Job No. EPA-228
Date: 7-28-78
Sheet 1 of
Test Data
Check List
Switch
Up
Switch
Down
Run No.
Dur .Hrs.
From
To
L Value
Max
.1
1
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ea
Dn
1
^X^[
/\JO
f
— 1
— 1
Remarks 1
Remarks 2
2
~^xc^
/
1
\
_HLrlIi3
1
/
'
3
~^xd
1
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weiahtinq
Fast Slow
Data Erase
Cal.
Altitude
Set Time
Clock Starts I
Start Clock
Set Time Run
Becrins
Enable Run
Display Off
Time Left Site
Bv: GS
Remarks 3
Calibrator (jjx
Cal. Level 92=70 dB
Frea. 1KHz
.te Locat
Site All Martin Park
High Wind!
Site Map on Back of Sheet
161
engineering dynamics, nc
-------
Community Noise Analyxer
Data Sheet
Job No. EPA-228
Dato: 7-28-78
Sheet 2 of
Test Data
Check List
Switch
Up
Switch
Down
Run No.
Dur.Hrs.
From
To
L Value
Max
.1
I
10
50
90
99
Min
.5/24
1/24
8/24
.5/8
2
5
20
Ea
Dn
h
i
T-7S-
>0 7*~
^x^
8S
5J
(*S
Ci
fS
?7
rr
rz
(ef-
ts
^
<•!
Remarks 1
5"
1
/& >«"
;//^5"
~^x^
ST
ST
6?
cz
*1
S7
5"^
S" J
6T
6J*
c/
&i
c
/
H- ="6
12 ^t
^^5«sd^
71-
7J
<>?
<>3
Go
*7
rr
s-f
6r
^7
6i
6/
Bat Test
1st Run
2nd Run
3rd Run
Mic/Aux
Weighting A
Fast Slow
Data Erase
Cal.
Altitude
X
X
Set Time
Clock Starts f~~
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
By: GS
Remarks 3 Heavy Winds Drop Balloon to
approx. 30.48m Some knocking heard
Remarks 2 Severe Statis-11: 26-11: :8ca libra tor GR
Split Second power loss - 11:29 Cal. Level 92=70 dB
Freer- 3-KHz
Site Location; Site All Martin Park
Site Map on Back of Sheet
162
engineering dynamics, nc
-------
Job No. EPA-228
Community Noise Analyzer
Data Sheet
Date: 7-28-78
Sheet 3
of
Test Data
Check List
Switch
Up
Switch
Down
Run No .
Dur .Hrs .
From
To
L Value
Max
.1
1
10
50
90
99
Min
. 5/2/1
1/24
8/24
.5/8
2
5
20
Ea
Dn
7
i
-hf-*&
-H^?*
"XT
Remarks 1 WindV Stopped
Run
Site Loca
s
!
fi '•n
1 5:M
TXCT
75
7-?
iS
62
5T2
iTC
5~5-
5-V
6C
6^
i~9
6c>
^
/
li-'TZ
\C 'ii
"^xcC!l
7d
7z
(>7
<•!
?7
5-5-
5-J-
ST.
G~
0,2.
SS
^J
Bat Test
1st Run
2nd Run
3rd Run
Mi p/Anx
Weighting
Fast s low
Data Erase
Cal.
Altitude 152.4m
X
A
Set Time
Clock Starts 1
Start Clock
Set Time Run
Begins
Enable Run
Display Off
Time Left Site
—
RVS DM
Remarks 3 winay Kain, TOOK caj.j.oua uuwn
5:55 left site - called ottice
Remarks 2 Windy Balloon Changing calibrator ™
Elevation - Down to 60.96m Cal. Level yj /u dB
Freer.
tion- Site All Martin Park
Site Map on Back of Sheet
163
engineering dynamics, nc
-------
SECTION 7
TECHNICAL DISCUSSION
OPTIMUM ALTITUDE
There is no one altitude that is optimum. To reduce the num-
ber of measurement locations one would desire the highest possible
altitude for each measurement. Another reason for a high altitude
is that during normal weather the balloon will move randomly with-
in a circle over the ground point, adding additional statistical
validity to the data. There are four constraints which may mandate
lower altitudes.
The first is loss of high frequency sound energy through
absorption. Generally for a spectrum such as we have in a community,
absorption becomes measureable beyond 300 meters. Figures 20 and 21
show octave band spectra as a function of altitude. At 275 meters
and above the high frequency part of the spectrum, say 2000 Hz,
begins to decay more rapidly due to atmospheric absorption. On
this basis we should consider 275 meters AGL as an upper bound
caused by this constraint. The 4000 Hz curve does not show similar
appreciable attenuation with altitude most probably because the
signal is very close to the system's noise floor.
The second is the balloon package itself. The lift capacity
of the balloon depends on the barometric altitude. The load is
both the fixed weight of the package and the variable weight of
the restraining line. An additional force, which can be considered
as a load, is the aerodynamic load (lift) at low but finite wind
speeds. This force cannot be relied upon to carry additional load
since wind speed is variable. Another factor which can be consid-
ered as a load factor is up or down drafts (vertical movement
of the air in which the balloon resides). If the balloon is
raised to its maximum possible height during a warm, sunny day,
it is unlikely that that particular altitude can be maintained
throughout a 24 hour period. Experience during development
testing of the aerial package has shown that it has been possible
to maintain balloon altitudes as high as 365 meters AGL for
a 24 hour period. In worst case situations, at Boulder altitude
1676 meters MSL, early morning hours and sinking stratified
164
-------
air masses, the highest practical altitude was as low as 259
meters AGL. On the other hand, it was found that altitudes as
high as 1000 meters could be reached for several hours.
The third factor is wind speed. As wind speed increases the
drag load increases. To accommodate this load, the balloon moves
downwind to cause the line to form an angle that balances both
vector components. Since the line is of constant length, the
balloon must descend causing an altitude change from the previous,
less windy period. When the balloon has excess lift at lower al-
titudes, this effect is lessened. The safety factor of lower al-
titude when sudden winds arise also suggests lower altitudes.
Experience suggests that altitudes less than 457 meters AGL are
suitable.
The minimum altitude is also of interest. Terrain and struc-
tural shielding at low altitudes reduces the integration effect
and causes local sources to be predominant. Figures 20 and 21
clearly show this effect. The average height of the trees and
buildings on the relatively flat terrain were near 15 meters. We
see from the figures that 60 meters (four structure heights) is
needed to get complete freedom from these shielding effects.
ACOUSTIC POWER OF BOULDER
One of the prime objectives of the program was to measure
the acoustic power emitted by the City of Boulder and to deter-
mine if there is a difference between the winter and summer sea-
son as would be intuitively suspected. If this is true, then it
would be possible by the aerial monitoring technique to determine
if a community is getting noisier or quieter and if a noise control
program is in effect working. The computation of acoustic power
of the City of Boulder is based upon the following assumptions:
1. That at an altitude of 152m above the city the city can be
treated as a plane source.
2. The atmospheric attenuation at 152m is negligible.
3. The average Leq value represents the average power.
Proceeding with these assumptions and using the flight data
from the winter and summer seasons the acoustic power levels were
computed for the Leg and
165
-------
K^
10 X 10 TO THt INCH 4fl O7O7
7 * 10 IN . AL«»NrHr* Ulti in || i .
\i>
111
Figure 20
-------
10 X 10 TO THE INCH
7 X in IN • Al nANFNf*
Figure 21
-------
Site
1
2
3
4
5
6
7
8
9
10
11
Site
1
2
3
4
5
6
7
8
9
10
11
Winter
52.37
60.09
58.80
54.46
62.86
53.88
58.67
50.36
57.36
57.88
Jeq
Average Total Leq 58.07
Winter
54.15
63.47
58.34
55.91
64.9
56.22
60.10
55.38
58.93
59.29
60.03
Summer
53.08
60.63
54.22
53.01
61.66
52.24
59.11
51.05
59.68
60.72
58.13
Summer
54.08
62.90
56.49
54.68
63.01
54.03
60.60
52.76
60.90
61.87
59.69
Difference
0.71
0.54
4.58
1.45
1.20
1.64
0.44
Difference
0.07
0.57
1.85
1.23
1.89
2.19
0.50
The above tables show that there is no significant difference
in the noise emission from the City of Boulder during the winter
and summer months using either the Leq or L10 as descriptors. It
was originally surmised that there would be a significant differ-
ence between the winter and summer seasons but this is not indi-
cated by the data. Only one site, site 3, at North Boulder Park
showed a significant difference of 4.58 dB but not in the direc-r
tion as expected; the winter season was noisier than the summer.
This site was the location of the weekend measurements, but even
that fact gives no clues as to the reason for the difference.
0
The most probably reason for the closeness of the noise
levels between the winter and summer seasons is that traffic noise
is invariant; the same number of people go to and from work the
year around in Boulder.
168
-------
By using the average summer and winter Leq, the average
A-weighted power of Boulder can be approximated. To do this the
intensity level is first computed by:
IL - (SPL + 10 log1Q 400/^oC) dB
where: SPL, = L dB
eq
P0 = 1.29 (273/T) (P0/0.75) kg/nr
where: T = absolute temperature
P0 = barometric pressure in mHg.
C = (331.4 + .607€>) m/sec
where:O - ambient temperature in C.
Using an average temperature of 11 C and an average baro-
metric pressure of 625 mmHg, the intensity level is computed to
to 58.8 dB. The intensity is then computed by:
I = 10Ilj/10 x IRef watt/m2
where: lRfif = 10~12 watt/m2
thus: I = 7.6 x 107 watt/m2
Using 3.6 x 10 m as the area of Boulder the A-weighted
power is then given by:
P. = 7.6 x 10~7 watt/m2 x 3.6 x 107 m2 = 27.4 watts
169
-------
TECHNICAL REPORT DATA
V.Vcsc /TjJ li'.\;r-icsiots on the Tivrjr bc'orc cor^^lcting)
; ^i*C--T r.o. J2.
— ~ T- o ~ p / 1 - Q n p 9 a
4. TITLE ANQSL.3T.TLE
An .Serial Noise I-'onitoring Study,
Technical Dissertation
7. Ai_T~iCfi{S)
Hov;ard N. McGregor, P.E.
R . C . Chanaud , PhD
9. PERFORMING ORGANIZATION NAME AND ACDRESS
Engineering Dynamics, Inc.
2709 W. 27th Avenue
Denver, Colorado S0211
i3. RECIP' tNT'S ACCESSION NO.
5. REPORT DATE
VU-L* -L-/ S.PERFORMINGOHGANIZATIONCODE
8. PERFORMING ORGANIZATION REPORT NO.
10. PROGRAM ELEMENT NO.
11. CONTRACT/GRANT NO.
i &S-01-35CO
12. SSC-N'SO?!NG AGENCY NAME AND ADDRESS j 1 3. TYPE OF REPORT ANO PERIOD COVERED
L. -. -nvironmenra-L f ^o^ccnon Agency 14. SPONSORING AGENCY CODE
Region VIII
1360 Lincoln St., Denver, CO 80295
"S. SwF^-iMcNTARY NOTES
16. A5STSACT
An aerial monitoring system was developed to measure the noise
produced in communities. The system consists of a tethered helium
filled balloon which lifts an P.M. telemetry sound measuring system
to altitudes of 300 m. A ground station receiving the telemetry
signal demodulates it so that the noise at the microphone can be
heard and analyzed on the ground . Measurements were taken at 10
sites in Boulder, Colorado, during the winter and summer seasons
to evaluate the system's performance and to develop operational
procedures. The test program revealed that the City of Boulder
has on the average the same noise levels during the winter and
summer seasons. Operational procedures for use of the system by
communities were developed.
17.
-------
|