NO. 1031-Approval of Certain Residential Subdivisions
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.. sou T 1-1 \Ii S S 1" RESEARCI-I 11\1 ST ITUT E
8500 ClJLr;ORA ROAD, · rOST OFFICE DHAWER 20510 . SAN ANTONIO, TEXAS 78284
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October'16, 1972 .
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Mr. Cliff Morton Ref: Project 04-3277-61
Morton Southwest
P. O. Box 18428 .
San Antonio, Texas 78286 ,
Dear Mr. lvlorton:
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Attached you will find a copy of the results of the Randolph Air Force Base' .
noise survey. You will note that this report generally confirms the origulal
belief that the CNR Zone 2 rating may be overly restrictive in certain areas
, 'when c011?-pared to the HUD General External Exposure Rating of HUD
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Circular 1390.2, (Chg 1 dtd,9-l-7l).
In fact when measuring areas rated CNR Zone 3 using the General External
Exposure standards it is found that for this installation these points (Refer.ence
'data for Test Points 6, 7, 8, 14 and 15) would fit in the "Discretionary--
Normally Acceptable" zone.
If there are any further questions concerning the .data or its interp~eta,tion,
, feel free to call at your convenien~e. .
w1U2t
Robert H. Pish
. " Senior Research Physicist
. Department of Applied Physics
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RHP:cr
I Encl.
xc: Mr. Sam Parnes
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-tl~J~ z- SAN ANTONIO~ HOUSTON, CORPUS CHRISTI,TEXAS, AND WASHINGTON, D.C.
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NOISE SURVEY AT RANDOL.PH AIR FORCE B~SE .
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C. R. Sparks' :
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'R. H. Pish
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( MORTON SOUTHWEST
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October 16, '1972
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, ' APPROVED: ~
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Gl (n Damewood, Director
DEPARTMENT of APPLIED PHYSICS . SOUTHWEST RESEARCH INSTITUTE
8~OO CULfBRA HOAD SAN ANTONIO, TEXAS 78264 (512) 664 - 5111
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,(,' Measurement Techniques
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, .. The primary field instrumentation, used during this progra'm is
pl'cscnted in Figure 1. Basically, this instrumentation senses the sound
. levels at each test point, turning on a separate signal for each threshold
cros sing. Analysis of the data then requires only the time, measurement
of the threshold cros~ing signals. . ,
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DEPARTMENT of APPLIED PHYSICS . SOUTHWEST RESE.ARCH INSTITUTE.
6~OO C UL(OHA rWAD SAN ANtONIO, HX,AS78264 (!)\2) 664 - ~\1l
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" Tandberg Instrument
. Tape Recorder
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GR-1565-A .". ; :.. ,
~ Sound SwRI Built ' , '"
Level Noise Threshold Record' ,. ::
- , ~. ' Meter Detector Channel .,.
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. . Time over 65 dBA .
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Time over 75 dBA
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. Voice Transcription Microphone '.. " ",;'
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FIGURE 1. FIELD INSTRUMENTATION FOR AIRCRAFT' ,
" FLYOVER NOISE MEASUREMENTS ,,"
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DATA .. ,
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Aircraft: Flyby Noise ,
Test points for the airport noisc measurements were selected with the
',,", aid of Mr. Sam Parncs and the final,test locations are presented in Figure 2.
" Tables land 2 present the raw data taken at the various test point locations.
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Table 1 includes all aircraft noise levels measurcd in both single and
. double flight configurations during the test sequence. The threshold levels
represent average' values for the number of overflights in the sample. Several
points need to be clarified in this table.' At Test Point 6 only one airc raft pro-
duced a noise level severe enough to cross the 65 dBA threshold in a period of
roughly 45 minlltes although there was constant aircraft activity on the west
runway and its related approaches. Many takeoffs and landing did occur but
they did not cross the 65 dBA threshold. At other test points single flights
were not repeated when the airc raft was other than the standard T37 and T38.
. \ . F,or the purpose of later calculations these transient aircrafts were ignored
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{ as i1not-typical" of average traffic. In addition, as illustrated by the T-38
in a "missed approach ", at Test Point 16, the noise threshold can vary markedly
() between flights of the sameairc raft type. ..
Table 2 represents threshold 'noise readings taken during thc test
sequency at two test points which had significant non-aircraft traffic. During
~he total time at Test Point 6, one aircraft crossed the threshold level of
65 dBA for 1. 2 seconds while non-aircraft noise accounted for 113.6 seconds
.' over 65 dBA and 13.7 seconds over 75 dBA.
Figure 3 is included simply as a geographic presentation of average
noise threshold data extracted from Table 1 to aid in undcrstanding the data,
. " and its relative magnetude at various test point locations. The alpha numeric
code begins with the time in second s over 65 d J?A right be"Iore the alpha
character. The A and B refer to the aircraft type. The next number is the
. , time over 75 dBA in seconds and the number in parenthesis is the pe~k noise
level in dBA recorded during the test.
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, , Noisc Data Taken Inside One Community Housin~
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During the study it was requested that an attempt be made to measure
noise levels within a typical home in the test area. The housc at 8323 Highlander
was chosen by Mr. Sam Parnes as representativc of homes in that area. Interior
noise measurements were made in the center of the living room arca an.d exte'rior
levels wer~ mcasur<?d 15 It from the road (curb) on a direct line with the front
(', door. Thesc levcls are presented in Table 3.
The house itself had the standard roof overhand, sheetrock walls on
2 x 4 studs with 3 inchcs of wall and 6 inches of ceiling insulation.
DEPARTII1ENT of-APPLIED PHYSICS . SOUTHWEST RESEARCH INSTITUTE
8!>OO CULLORA rWAD SAN ANTONIO. HXAS 78264 (~\2) 664 - ~\\\
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. F1GURE 2. ,>0:5'> -POiN'> LOCA ,>lONS ,
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. TABLE 1
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AVERAGE THRESHOLD LEVELS FOR VARIOUS AIRCRAFT
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Singlc Flight Max Double Flight Max
. t>65 t>75 t>65 t>75 Flight
.TI:. A ircl'aft No. (sec) (sec) dBA No. (sec) ( s ec ) dBA C f' t' **
on'lgura LOn
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6 T-37 1 1.2 - 67-68 ,T
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. 7 i T-37 2 20.8 11. 4 98 T
T-38 2 11. 6 ,67-68 . ,
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8 T-38 2 20.9 9. 3 110 T
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9 T-38 2 28.9 14.0 80 1 25,3 ' 17.5 . T,
C-124 1 41. 1 '20. 1 80
T..29 1 23.7, 6.2' .
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, ' 11 T-37 2 24.1 12.3 93 1 24.0 14.3 T
12 ' T.. 37 3 4.4 ' 72 ,. , T
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'T-38 2 , 17.3 0.8 75 1 '31.0 14.5
T-28 1 21.7 0.2 72-75
, 14 ' T-37 3 18.2' 8.8 100 1 17.3 10.9 100 L
15 T-38 3 16.4 6.4 , 96.5 L
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16 T-33 1 16.2 10.4 94 L
T-38 1 26.3 12.7 (Missed Approach)
T:' 38 2 14.7' 8. 1 94
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17 T..38 3 10,.0 .. 74 I 15.4 - 74 L
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18 T-37 1 19.4 8.9 80 1 22.9 9.5 ~
. ',19' T..'~8, ' 3 15.8 *.6 ~ 25 79, 1 13.1 1.6 ,L
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*Two readings only. ' '-
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, ** T = Take Offs
, L = Landil!gs
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TAB LE 2
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THRESHOLD VALUES FOR NON-AIRCRAFT VEHICLES
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,TP Vehic1e (sec) (sec) , dBA
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6 Pickup and Cement Mixcr, 29.0 2.4
Large Sedan 5.7 0.8
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Brewery Truck . '9.4 --
Station Wagon 4.7 -- 74
Air Force Flat Bed Truck ' ' 9.8 3. I 75
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Pickup & IICamero". 23.7 . 6.2
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Pickup, Sedan & Pickup 14.0 --
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Picku p 4.0 0.6
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. "Merc. Comet" & Pickup 4. 1 0.6
Tractor & 11Olds" 3.6 --
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Ford & Plymouth 5.6 --
7 Truck 3~ 8 -- 74
Tractor w/Hay Baler ' 10.3 3.3
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. Dump Truck, 5.6 1.4
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Truck , 5.0 0.9
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15.8B6.3(79)' . ,:"..'.;,.
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IOB(74) ,".' .: Texas 78
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18.2A8, 8(100) .' ..',..,..,.,..,.;..,', :',..,'..
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24.1A12.3(93f ' . r ,'. : ,':',:'
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" ... t65 (B-T38) 75 ax. .
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FIGU~E3. ,AVERAGE NOISE THRESHOLD DATA . '
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. 1'ABLE 3.' NOISE DA TA ATTEST POINT 4
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(Inside the Home at 8323 Highlander) .
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. Noise Level Test
Condition (dBA) Event
Air Conditioner Front Door )'c **
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1., Off Open 42-44 62 Mercury Monterrey Driving
By
2. Off Closed 43-44 65-66 T-37 Flyover
3. On Closed 52-55 N~nc
4. On Open 53-55 69-70 Ford Ec onoline Van
Driving By
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',50' On Closed 52 . 69-70 Ford Econoline Van
. ' , Driving By
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* ' , Inside measurement J;'I1ade in the centcr of the living room area
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** Outside m,easurements were made 15 feet from the road edge
. (curb) towards the house and in a direct line with the front door.
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ANALYSIS ..
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For Aircraft Flyovers ' ,
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Table 4 presents t.he calculatio~ls of Total Threshold Levels' [rom
'" ' the test data [or the test points listed in Table 1. Using the criteria of
""\ HUD as presented in Circular 1390,2, Chg. 1 (elated 9-1-71) on page 8, [or
GClleral External Exposures, and the data as presented in Table 4, it is
p'ossible to place the measured noise levels in "Discretionary--Normally
Acceptable" category. However, the final rating may include more than the
objective measure o[ noise levels and time exposures. The term "Loud .
Repetitivc Sound s on Site" might be construed to take the final rating out of
, the realm of objcctive measurement and into a subjective area requiring
interpretation by the governmental agcncy having jurisdiction in this particular
case. ,
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Typically "Loud Repetitive Sounds. . it have been interpreted in other
. , criteria to apply to the noise generated by drop hammers, forges; etc.,
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~ found at heavy construction factories, Certainly, it may still be possible to
place the noise just off the end of each runway in the "Loud.... " category;
however, at much distance beyond these points the decision becomes clouded.
( A tandem highway truck on a nearby road makes overall noise levels similar
to an aircraft flyoverj however, the frequency spectra and the implied annoyance
value of each then becomc s a subjective response and beyond the realm of
objective test methodolgie s. ,
.' The majority o[ dat~ was taken on a southward landing and takeoff
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. However, this shol,.lld be more than adequate for the evaluation as
pattern.
, this flight pattern is used 85 percent of the year with only 15 percent of the
year having northward takeoffs.
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, B. Noise Data Taken Inside the Community Housing
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From the data of Table 3 it is apparent that the exterior n<?ise levels
froni both ground and air traffic at the time of the tests did not materially
affect the interior noise levels. ,
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air conditioning' unit (55 dBA). The unit placed in this house is typical of
many units placed in homes of this price range and accounts for the noise
levels of 55 dBA measured. Therefore, when comparing this levcl to
standards for Interior Noise Exposure as presented in HUD Circular 1390.2
(dat,ed 8-4-71)" page 9, which places a maximum noise level of 55 dDA for
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no more than 1 hour per day, tIle internal air conditioncrand not the extei'nal
( traffic noi so' violates the standard. \.
DEPART/lENT of APPLIED PHYSICS . .sOUTHWEST RESEARCH INSTITUTE
6~OO C UL(6RA ROAD SAN ANTONIO, T (XAS 76204 (~\2) 684 - :i\\1
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TABLE 4
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CACULATION OF NOISE 'RATING
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t > 65' T >65 t> 75 T >75
. ' Aircraft ' sec hrs see hrB
rr, Dens ity),'c (Partial) (Total) (Partial) , (T otal) Rating
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".~ ,6 138 1.2 0.046 - - Discretionary - Normally
, acceptable,
7 138 20.8 0.797 11.4 ' 0.436
263 11.6 0.847, - -
1. 644 ' 0.436 II "
8 263 20.9 1. 53 9.3 0.679 " II
9 " 263 28.9 2. 11 14.0 1.02 II 1\
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'11 , ,; '138 24.1 0.923 ' 12.3 0.471 II II,
, 12 138 4.4 ' O. 168 - -
263 17.3 1.26 0.8 0.058
1.428 " II
~4 138 18.2 0.6,97 , 8.8 0.337 II II
15 '263, 16.4 1. 20 6.4 0.467 II II'
16 263 14.7 1. 07 8. 1 O. 592 II ,II :
17 263' 10" 0 0.731 - , - 11 'II
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,18 . 138 19.4 0.744 ' 8.9 0.341 11 II
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19 263 15,.8 1. 15 6.25 ' 0.457 Ii Ii
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lie A pensity of 138 flights repl'esent.s T 37 traffic off the West Runway
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.r and a density of 263 flights repr.esents T 38 traffic off the East Runway.
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RESOLUTION #1031
DETERMINING THE DETRIMENTAL EFFECT OF THE CITY OF SCHERTZ AND ITS
-ENVIRONS OF THE WITHHOLDING OF APPROVAL OF CERTAIN RESIDENTIAL SUBDIVISIONS
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WITHIN THE CITY AND ITS ENVIRONS BY THE UNITED STATES DEPARTMENT OF HOUSING
AND URBAN DEVELOPMENT FOR FHA INSURANCE, AND REQUESTING THE HONORABLE JOHN
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TOWER,. UNITED STATES SENATOR. TO ASSIST IN OBTAINING SUCH APPROVAL.
WEll-US, th~ City Council has for several months been aware of the
withholdini af ap~roval by the United States Department of Housini ani Urban
Development of certain residential subdivisions within the City of Schertz and
its environs for FHA insurance purposes; aDd,
WHEREAS, such .subdivisiens are areatly depenient upon FHA insurei
housini and the lack thereof has curtailed further land development and the
availability of needed housina, and has detrimentally affected the econemy
of this area; and,
WHEREAS, it has been made known to the City Council that the withholdina
of said approval by the Department of Housini and Urban Development is based
upon the placini of these subdivisions in "Noise Zone #2" pursuant te
reaulations of said Department pertainini to noise pollution in the proximity
of Airports; and,
WHEREAS, the developers of such subdivisions employed an independent
research institution, the Southwest Research Institute throuih its Department
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of Applied Physics, to conduct a Noise Survey of the subdivision in question
within the City of Schertz and its environs, adjacent to Randolph Air Force
Base, and the results of such survey have been made known to the City Council;
and,
WHEREAS, the results of such survey ~eveal that 'noise pollution is not
a detrimental factor in reiard to such subdivisions; and,
WHEREAS, it appears that further withholdini of approval for FHA
insurance by the Department of Housini and Urban Development is unreasonable
and detrimental to the City of Schertz and its citizens; and,
WHEREAS, the Honorable John Tower, Senior United Stat~s Senator for
the State of Texas, has lona been of assistance to the citizeBs of the area
and should be called upon in this reaard;
NOW, THEREFORE,
BE IT RESOLVED BY THE CITY OF SCHERTZ:
l. That the Honorable John Towe., United States Senator be and he is
hereby requested to utilize his office aad ability in obtaiaina the approval
by the United States Department of Housinl anG Urbaa Development of the
residentiai 8ubdivisioasherein above referred to, for the purpose of FHA
il18uraace.
2. That a copy of the report eatitled tlNoise Survey at Raadolph Air
Force Base" prepared by the Southwest Research Institute, be attached hereto
aDd incorporated herein by refereace, and
3. That the City Clerk mail a copy of this resolution to Honorable
;JobD Tower, Unite;' States Senate, Senate Office Buildini, Washiniton, D..C.,
20510.
PASSED AND APPROVED THIS '7 DAY OF DECEMBER, U72.
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ATTEST: MAYOR
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