7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 1/41
Noise Survey
Vance Brand Municipal Airport
229 Airport Road
Longmont, Colorado
February 5, 2015
Terracon Project No. 25147105
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 2/41
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 3/41
EXECUTIVE SUMMARY
Terracon Consultants, Inc. (Terracon) conducted a noise survey for the Vance Brand Municipal
Airport facility located at 229 Airport Road, Longmont, Colorado. The purpose of the survey was
to document community noise levels at six Client-selected locations near the airport during
weekend skydiving operations. The skydiving operations are performed by two aircraft, a
DeHavilland Twin Otter aircraft and Beechcraft King Air aircraft. The aircraft only operate
between dawn and dusk.
The results of the survey indicate that the measured noise levels for noise sources at the six
locations ranged from 58.8 dBA to 82.9 dBA. Most of the noise measured at all locations was in
the mid to higher frequency range. The average noise level for noise sources for the six
locations was 69.3 dBA. The average noise level attributable to the Twin Otter aircraft was 70.3
dBA at the six locations. The highest noise level recorded of the Twin Otter aircraft was 74.4
dBA while the Otter was flying above the intersection of North 65th Street and Galatia Road.
The average noise level attributable to the King Air aircraft was 69.0 dBA at the six locations.
The highest noise level recorded of the King Air aircraft was 82.9 dBA during it’s ascent at theintersection of Nelson Road and Sunset Street location. However, during most of the survey
two or more activities were occurring during the 5 minute measurement period that contributed
to the average noise levels recorded while the Twin Otter and King Air were flying. These
activities included noise sources other 1 than the Twin Otter or King Air and sometime included
both the Twin Otter and King Air flying at the same time.
The average noise level attributable to all other background noise sources (not including theOtter or King Air) at the six locations was 68.1 dBA. The highest noise level recorded for a
background noise source was 76.3 dBA attributable to heavy traffic on Ken Pratt Boulevard to
the east of the Nelson Road and Sunset Street (Flower Bin) location
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 4/41
TABLE OF CONTENTS
Page
1.0
INTRODUCTION .............................................................................................................................. 1
2.0 PROCESS DESCRIPTION .............................................................................................................. 1
3.0 REGULATORY OVERVIEW ........................................................................................................... 1
4.0 METHODS ....................................................................................................................................... 1
5.0 FINDINGS AND CONCLUSIONS ................................................................................................... 3
5.1 Sound Pressure Level Measurements ................................................................................ 3
5.2 Discussion of Sound Level Measurements ......................................................................... 6
6.0 GENERAL COMMENTS.................................................................................................................. 7
APPENDICES
APPENDIX A: Exhibit A1- Sound Level Readings From Six Locations
APPENDIX B:
APPENDIX C:
Observation Log
Exhibit A2- Approximate Noise Survey LocationsSound Level
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 5/41
NOISE SURVEY
VANCE BRAND MUNICIPAL AIRPORT
229 Airport Road
Longmont, Colorado
Terracon Project No. 25147105
February 5, 2015
1.0 INTRODUCTION
Terracon Consultants, Inc. (Terracon) conducted a noise survey for the City of Longmont Vance
Brand Municipal Airport (Client) located at 229 Airport Road, Longmont, Colorado. The
assessment was conducted on September 27, 2014 in general accordance with our proposal
P25140583 dated September 15, 2014. Mr. Kurt L. Streeb, Certified Hazardous Materials
Manager (CHMM) with Terracon, performed the field work for this project in response to a request
by Tim Barth, Airport Manager, Vance Brand Municipal Airport.
The scope of this project includednoise monitoring of six Client-selected locations near the
Vance Brand Municipal Airport during scheduled flights of a DeHavilland Twin Otter aircraft and
Beechcraft King Air aircraft and logging of the noise generated at each location.
2.0 PROCESS DESCRIPTION
The Vance Brand Municipal Airport has a single runway and operates 24 hours a day, 365 daysa year. Neighbors surrounding the facility have complained about noise from skydiving
operations during the weekends. Skydiving generally occurs between dawn and dusk daily and
is performed by two aircraft a DeHavilland Twin Otter and a Beechcraft King Air
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 6/41
Noise SurveyVance Brand Municipal Airport ■ Longmont, ColoradoFebruary 5, 2015 ■ Terracon Project 25147105
Intersection of North 65th
Street and Galatia Road(on North 65th Street in a rural area with scattered single-family residences and
farms)
Field behind Little Leaf Court, Nelson Park Subdivision
(a dense single-family residential development)
Intersection of Gunbarrel Road and Mount Sherman Road
(a dense single-family residential development)
Intersection of 10th Avenue and Fordham Street
(east side of the Twin Peaks Golf Course, adjacent to a dense single-family
residential development)
Intersection of Nelson Road and Sunset Street (Flower Bin)
(a commercial development, approximately 400 feet northwest of Ken Pratt
Boulevard (Highway 119))
The measurement locations were selected by the Client based upon previous testing conducted
by the Client and the history of citizen noise complaints in the vicinity of these locations.
The measurements were made using a Quest Technologies SoundPro Type 1 sound level
meter set on slow response. One-third octave bands and Z-weighted measurements weretaken. The microphone of the sound level meter was aimed at the noise source(s), per the
manufacturer’s instructions, and the five-minute readings were recorded on the instrument’s
d t l f l t l i ith D t ti M t S ft (DMS®) id d b Q t
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 7/41
Noise SurveyVance Brand Municipal Airport ■ Longmont, ColoradoFebruary 5, 2015 ■ Terracon Project 25147105
5.0 FINDINGS AND CONCLUSIONS
5.1 Sound Pressure Level Measurements
The results of the sound pressure level measurements are provided in Table 1 and observations
made during the survey are provided in Appendix B. Since noise levels were recorded over a
five-minute period, some of the variation is reduced.
Table 1
Sound Pressure Level Measurements
3200 West Block of Nelson Road at Highway 36
Date Time Activity
Sound Pressure Level
5-Minute Average (dBA)
9/27/14 0904 Cars on Nelson Road 68.4
0909 No activity 63.0
0914 King Air above at 12,500 feet 70.6
0919 Car on Nelson Road and Otter above 68.6
0924 Cars and truck on Nelson Road, Otter circling above
mountains to the west, helicopter above
68.0
0929 Motorcycle on Nelson Road 71.3
0934 Husky aircraft flying low 70.7
0939 Cars on Nelson Road 68.7
0944 Cars and trucks on Nelson Road and King Air above 74.5
0949 Jet above and cars and trucks on Nelson Road 70 7
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 8/41
Noise SurveyVance Brand Municipal Airport ■ Longmont, ColoradoFebruary 5, 2015 ■ Terracon Project 25147105
Intersection of North 65th Street and Galatia Road
Date Time Activity
Sound Pressure Level
5-Minute Average (dBA)
9/27/14 1005 Tractor on road, Otter above and single engine small
plane flying low, yellow single engine plane flying
low, King Air descending and single engine small
plane low on the horizon
74.4
1010 Single engine small plane low on the horizon 68.5
1015 Cars on road, small single engine plane low on the
horizon and Otter above unloading skydivers
68.9
1020 King Air ascending, small single engine plane
ascending, King Air above, Otter ascending and
truck on road
70.4
1025 Otter above 74.4
1030 Otter above 72.6
1035 Otter above 68.4
Average 71.1
Field behind Little Leaf Court, Nelson Park Subdivision
Date Time Activity
Sound Pressure Level
5-Minute Average (dBA)
9/27/14 1052 Small white plane above, King Air ascending, smallyellow plane descending
63.0
1057 Single engine white plane ascending, single engine
hit l b d l i l i l
63.8
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 9/41
Noise SurveyVance Brand Municipal Airport ■ Longmont, ColoradoFebruary 5, 2015 ■ Terracon Project 25147105
Intersection of Gunbarrel Road and Mount Sherman Road
Date Time Activity
Sound Pressure Level
5-Minute Average (dBA)
9/27/14 1159 King Air above and single engine plane from Boulder
Airport above
62.8
1204 No activity 64.5
1209 No activity 63.1
1214 No activity 65.8
1219 Pickup truck passing and King Air above 65.0
1224 King Air descending 58.8
1229 No activity 61.2
1234 Otter above and jet above 64.8
1239 Otter descending 67.1
1244 Car on road and King Air deploying skydivers 65.5
Average 63.9
Intersection of 10th Avenue and Fordham Street
Date Time Activity
Sound Pressure Level
5-Minute Average (dBA)
9/27/14 1412 Small single engine plane above, lawnmower in useand jet above
74.4
1417 Otter deploying skydivers and Otter descending 71.8
1422 Jet above and Otter ascending 63 9
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 10/41
Noise SurveyVance Brand Municipal Airport ■ Longmont, ColoradoFebruary 5, 2015 ■ Terracon Project 25147105
Intersection of Nelson Road and Sunset Street (Flower Bin)
Date Time Activity
Sound Pressure Level
5-Minute Average (dBA)
9/27/14 1529 King Air ascending 82.9
1534 Cars on Sunset Street, King Air deploying skydivers
and Otter ascending
73.9
1539 Otter doing “hop and pop” 73.6
1544 Heavy traffic on Ken Pratt Boulevard to the east 76.3
1549 King Air ascending 74.5
1554 No activity 71.8
1559 No activity 70.4
Average 74.87
5.2 Discussion of Sound Level Measurements
The sound level measurements provided in Table 1 above are snapshots in time and were
averaged over 5 minute intervals by the Quest SoundPro meter. During most of the survey, two
or more activities were occurring during the 5 minute measurement period that contributed to
the average noise levels recorded while the Twin Otter and King Air were flying. The highest
average noise level recorded for the Twin Otter aircraft was 74.4 dBA while the Otter was flying
above the intersection of North 65th Street and Galatia Road. The highest average noise level
recorded for the King Air aircraft was 82.9 dBA during the ascent of the aircraft at the
intersection of Nelson Road and Sunset Street location. The highest average noise level
recorded for a background noise source (without the Otter or King Air) was 76.3 dBA due to
heavy traffic on Ken Pratt Boulevard (Highway 119) to the east of the Nelson Road and Sunset
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 11/41
Noise SurveyVance Brand Municipal Airport ■ Longmont, ColoradoFebruary 5, 2015 ■ Terracon Project 25147105
6.0 GENERAL COMMENTS
The level of effort and associated tasks completed for this assessment were limited to the scope
of services outlined in our proposal P25140583 dated September 15, 2014. Terracon did not
attempt to identify every potential exposure or hazard present at the site.
The results, findings, conclusions, and recommendations expressed in this report are based on
conditions observed on September 27, 2014. Many factors such as atmospheric conditions,
outdoor temperatures and variations in aircraft and traffic patterns can affect noise monitoring
results. The information contained in this report should not be relied upon to represent conditions
that existed previously or at a later date. Terracon does not warrant the services of regulatory
agencies, equipment providers, or other third parties supplying information, which may have been
used in the preparation of this report. No warranty, express or implied is made.
This report is prepared for the exclusive use of our Client for the specific application to the project
discussed and has been prepared in accordance with generally accepted industrial hygiene
practices. In the event any changes in nature or location of processes, materials, or other
conditions as outlined in this report are observed, the conclusions contained in this report cannot
be considered valid unless the changes are reviewed and the conclusions of this report are
modified or verified in writing by the industrial hygienist.
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 12/41
APPENDIX A
Exhibit A1- Sound Level Readings at Six Client-selected Locations
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 13/41
3 2 0 0 W e s t B l o c k o f N e l s o n R o a d a t H i g h w a y 3 6
9 / 2 7 / 2 0 1 4
I n f o r m a t i o n P a n e l
N a m e 3 2 0 0 W e s t B l o c k o f N e l s o n R o a d a t H i g h w a y 3 6
S t a r t T i m e 9 / 2 7 / 2 0 1 4 8 : 5 8 : 4 8 A M
S t o p T i m e 9 / 2 7 / 2 0 1 4 9 : 5 0 : 2 5 A M
D e v i c e N a m e B L H 0 4 0 0 1 3
M o d e l T y p e S o u n d P r o D L
D e v i c e F i r m w a r e R e v R . 1 3 H
C o m m e n t s
S u m m a r y D a t a P a n e l
D e s c r i p t i o n M e t e r V a l u e D e s c r i p t i o n M e t e r V a l u e
L e q 1 7 0 . 4 d B
E x c h a n g e R a t e 1 3 d B W e i g h n g 1 Z
R e s p o n s e 1 S L O W B a n d w i d t h 1 1 / 3
E x c h a n g e R a t e 2 3 d B W e i g h n g 2 A
R e s p o n s e 2 S L O W
L o g g e d D a t a C h a r t
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 14/41
M # 1 - 2 0 H z 5 2 . 9 d B
M # 1 - 2 5 H z 5 2 . 1 d B
M # 1 - 3 1 . 5 H z 4 9 . 7 d B
M # 1 - 4 0 H z 5 1 . 3 d B
M # 1 - 5 0 H z 5 7 . 8 d B
M # 1 - 6 3 H z 6 1 d B
M # 1 - 8 0 H z 5 8 . 7 d B
M # 1 - 1 0 0 H z 5 8 . 5 d B
M # 1 - 1 2 5 H z 5 8 . 5 d B
M # 1 - 1 6 0 H z 5 4 . 4 d B
M # 1 - 2 0 0 H z 5 3 . 1 d B
M # 1 - 2 5 0 H z 5 3 . 7 d B
M # 1 - 3 1 5 H z 5 1 . 9 d B
M # 1 - 4 0 0 H z 5 2 . 2 d B
M # 1 - 5 0 0 H z 5 1 . 6 d B
M # 1 - 6 3 0 H z 5 2 . 2 d B
M # 1 - 8 0 0 H z 5 3 . 4 d B
M # 1 - 1 . 0 0 k H z 5 4 . 3 d B
M # 1 - 1 . 2 5 k H z 5 2 . 5 d B
M # 1 - 1 . 6 0 k H z 4 9 . 6 d B
M # 1 - 2 . 0 0 k H z 4 6 . 9 d B
M # 1 - 2 . 5 0 k H z 4 3 . 8 d B
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 15/41
F i l t e r S u m m a r y C h a r t - L e q
3 2 0 0 W e s t B l o c k o f N e l s o n R o a d a t H i g h w a y 3 6 : F i l t e r S u m m a r y C h a r t - L e q
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 16/41
I n t e r s e c t i o n o f N o r t h 6 5 t h S t r e e t a n d G a l a t i a R o a d
9 / 2 7 / 2 0 1 4
I n f o r m a t i o n P a n e l
N a m e I n t e r s e c o n o f N o r t h 6 5 t h S t r e e t a n d G a l a a R o a d
S t a r t T i m e 9 / 2 7 / 2 0 1 4 1 0 : 0 0 : 1 7 A M
S t o p T i m e 9 / 2 7 / 2 0 1 4 1 0 : 3 6 : 0 7 A M
D e v i c e N a m e B L H 0 4 0 0 1 3
M o d e l T y p e S o u n d P r o D L
D e v i c e F i r m w a r e R e v R . 1 3 H
C o m m e n t s
S u m m a r y D a t a P a n e l
D e s c r i p t i o n M e t e r V a l u e D e s c r i p t i o n M e t e r V a l u e
L e q 1 7 1 . 7 d B
E x c h a n g e R a t e 1 3 d B W e i g h n g 1 Z
R e s p o n s e 1 S L O W B a n d w i d t h 1 1 / 3
E x c h a n g e R a t e 2 3 d B W e i g h n g 2 A
R e s p o n s e 2 S L O W
L o g g e d D a t a C h a r t
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 17/41
M # 1 - 2 0 H z 5 2 . 2 d B
M # 1 - 2 5 H z 5 0 . 2 d B
M # 1 - 3 1 . 5 H z 4 9 . 8 d B
M # 1 - 4 0 H z 4 9 . 4 d B
M # 1 - 5 0 H z 5 2 . 5 d B
M # 1 - 6 3 H z 5 2 . 9 d B
M # 1 - 8 0 H z 5 9 . 6 d B
M # 1 - 1 0 0 H z 6 6 d B
M # 1 - 1 2 5 H z 5 9 . 4 d B
M # 1 - 1 6 0 H z 5 4 . 9 d B
M # 1 - 2 0 0 H z 5 9 . 9 d B
M # 1 - 2 5 0 H z 5 5 d B
M # 1 - 3 1 5 H z 5 6 . 5 d B
M # 1 - 4 0 0 H z 5 3 . 8 d B
M # 1 - 5 0 0 H z 5 5 . 3 d B
M # 1 - 6 3 0 H z 5 4 . 7 d B
M # 1 - 8 0 0 H z 5 4 . 2 d B
M # 1 - 1 . 0 0 k H z 5 3 . 6 d B
M # 1 - 1 . 2 5 k H z 5 2 . 4 d B
M # 1 - 1 . 6 0 k H z 5 0 . 8 d B
M # 1 - 2 . 0 0 k H z 4 8 . 7 d B
M # 1 - 2 . 5 0 k H z 4 8 . 1 d B
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 18/41
F i l t e r S u m m a r y C h a r t - L e q
I n t e r s e c o n o f N o r t h 6 5 t h S t r e e t a n d G a l a a R o a d : F i l t e r S u m m a r y C h a r t - L e q
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 19/41
F i e l d B e h i n d L i t t l e L e a f C o u r t , N e l s o n P a r k S u b d i v i s i o n
9 / 2 7 / 2 0 1 4
I n f o r m a t i o n P a n e l
N a m e F i e l d B e h i n d L i l e L e a f C o u r t , N e l s o n P a r k D i v i s i o n
S t a r t T i m e 9 / 2 7 / 2 0 1 4 1 0 : 4 7 : 1 5 A M
S t o p T i m e 9 / 2 7 / 2 0 1 4 1 1 : 3 0 : 3 1 A M
D e v i c e N a m e B L H 0 4 0 0 1 3
M o d e l T y p e S o u n d P r o D L
D e v i c e F i r m w a r e R e v R . 1 3 H
C o m m e n t s
S u m m a r y D a t a P a n e l
D e s c r i p t i o n M e t e r V a l u e D e s c r i p t i o n M e t e r V a l u e
L e q 1 6 6 . 8 d B
E x c h a n g e R a t e 1 3 d B W e i g h n g 1 Z
R e s p o n s e 1 S L O W B a n d w i d t h 1 1 / 3
E x c h a n g e R a t e 2 3 d B W e i g h n g 2 A
R e s p o n s e 2 S L O W
L o g g e d D a t a C h a r t
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 20/41
F i l t e r S u m m a r y C h a r t - L e q
F i e l d B e h i n d L i l e L e a f C o u r t , N e l s o n S u b d i v i s i o n : F i l t e r S u m m a r y C h a r t - L e q
F i l t e r S u m m a r y T a b l e - L e q
F i l t e r L e q
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 21/41
M # 1 - 4 0 0 H z 4 9 d B
M # 1 - 5 0 0 H z 4 6 . 4 d B
M # 1 - 6 3 0 H z 4 4 . 4 d B
M # 1 - 8 0 0 H z 4 1 . 8 d B
M # 1 - 1 . 0 0 k H z 4 0 . 9 d B
M # 1 - 1 . 2 5 k H z 4 0 . 3 d B
M # 1 - 1 . 6 0 k H z 3 8 . 7 d B
M # 1 - 2 . 0 0 k H z 3 7 . 2 d B
M # 1 - 2 . 5 0 k H z 3 7 . 1 d B
M # 1 - 3 . 1 5 k H z 3 6 . 3 d B
M # 1 - 4 . 0 0 k H z 3 0 . 7 d B
M # 1 - 5 . 0 0 k H z 2 8 . 9 d B
M # 1 - 6 . 3 0 k H z 2 7 . 8 d B
M # 1 - 8 . 0 0 k H z 3 2 . 9 d B
M # 1 - 1 0 . 0 0 k H z 2 4 . 6 d B
M # 1 - 1 2 . 5 0 k H z 1 8 . 8 d B
M # 1 - 1 6 . 0 0 k H z 1 5 . 6 d B
M # 1 - 2 0 . 0 0 k H z 1 4 . 4 d B
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 22/41
I n t e r s e c t i o n o f G u n b a r r e l R o a d a n d M o u n t S h e r m a n R o a d
9 / 2 7 / 2 0 1 4
I n f o r m a t i o n P a n e l
N a m e I n t e r s e c o n o f G u n b a r r e l R o a d a n d M o u n t S h e r m a n R o a d
S t a r t T i m e 9 / 2 7 / 2 0 1 4 1 1 : 5 4 : 1 3 A M
S t o p T i m e 9 / 2 7 / 2 0 1 4 1 2 : 4 7 : 2 5 P M
D e v i c e N a m e B L H 0 4 0 0 1 3
M o d e l T y p e S o u n d P r o D L
D e v i c e F i r m w a r e R e v R . 1 3 H
C o m m e n t s
S u m m a r y D a t a P a n e l
D e s c r i p t i o n M e t e r V a l u e D e s c r i p t i o n M e t e r V a l u e
L e q 1 6 4 . 3 d B
E x c h a n g e R a t e 1 3 d B W e i g h n g 1 Z
R e s p o n s e 1 S L O W B a n d w i d t h 1 1 / 3
E x c h a n g e R a t e 2 3 d B W e i g h n g 2 A
R e s p o n s e 2 S L O W
L o g g e d D a t a C h a r t
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 23/41
M # 1 - 2 0 H z 4 3 . 8 d B
M # 1 - 2 5 H z 4 2 . 8 d B
M # 1 - 3 1 . 5 H z 4 2 . 7 d B
M # 1 - 4 0 H z 4 0 . 9 d B
M # 1 - 5 0 H z 4 1 . 1 d B
M # 1 - 6 3 H z 4 3 . 7 d B
M # 1 - 8 0 H z 4 6 . 4 d B
M # 1 - 1 0 0 H z 4 3 . 8 d B
M # 1 - 1 2 5 H z 4 1 . 1 d B
M # 1 - 1 6 0 H z 3 8 . 7 d B
M # 1 - 2 0 0 H z 4 0 . 6 d B
M # 1 - 2 5 0 H z 3 6 . 4 d B
M # 1 - 3 1 5 H z 3 5 . 9 d B
M # 1 - 4 0 0 H z 3 7 d B
M # 1 - 5 0 0 H z 3 8 . 1 d B
M # 1 - 6 3 0 H z 3 9 . 4 d B
M # 1 - 8 0 0 H z 3 5 . 3 d B
M # 1 - 1 . 0 0 k H z 3 4 . 8 d B
M # 1 - 1 . 2 5 k H z 3 3 . 2 d B
M # 1 - 1 . 6 0 k H z 3 2 . 8 d B
M # 1 - 2 . 0 0 k H z 3 2 . 1 d B
M # 1 - 2 . 5 0 k H z 3 3 . 6 d B
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 24/41
F i l t e r S u m m a r y C h a r t - L e q
I n t e r s e c o n o f G u n b a r r e l R o a d a n d M o u n t S h e r m a n R o a d : F i l t e r S u m m a r y C h a r t - L e q
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 25/41
I n t e r s e c t i o n o f 1 0 t h A v e n u e a n d F o r d h a m S t r e e t
9 / 2 7 / 2 0 1 4
I n f o r m a t i o n P a n e l
N a m e I n t e r s e c o n o f 1 0 t h A v e n u e a n d F o r d h a m S t r e e t
S t a r t T i m e 9 / 2 7 / 2 0 1 4 2 : 0 7 : 4 4 P M
S t o p T i m e 9 / 2 7 / 2 0 1 4 3 : 0 6 : 4 6 P M
D e v i c e N a m e B L H 0 4 0 0 1 3
M o d e l T y p e S o u n d P r o D L
D e v i c e F i r m w a r e R e v R . 1 3 H
C o m m e n t s
S u m m a r y D a t a P a n e l
D e s c r i p t i o n M e t e r V a l u e D e s c r i p t i o n M e t e r V a l u e
L e q 1 7 1 . 7 d B
E x c h a n g e R a t e 1 3 d B W e i g h n g 1 Z
R e s p o n s e 1 S L O W B a n d w i d t h 1 1 / 3
E x c h a n g e R a t e 2 3 d B W e i g h n g 2 A
R e s p o n s e 2 S L O W
L o g g e d D a t a C h a r t
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 26/41
M # 1 - 2 0 H z 5 1 . 6 d B
M # 1 - 2 5 H z 5 0 . 2 d B
M # 1 - 3 1 . 5 H z 5 0 . 2 d B
M # 1 - 4 0 H z 4 8 . 2 d B
M # 1 - 5 0 H z 5 2 . 5 d B
M # 1 - 6 3 H z 5 3 . 9 d B
M # 1 - 8 0 H z 5 4 . 1 d B
M # 1 - 1 0 0 H z 5 8 . 3 d B
M # 1 - 1 2 5 H z 5 2 . 3 d B
M # 1 - 1 6 0 H z 4 9 . 5 d B
M # 1 - 2 0 0 H z 4 9 . 7 d B
M # 1 - 2 5 0 H z 4 7 . 4 d B
M # 1 - 3 1 5 H z 4 6 . 2 d B
M # 1 - 4 0 0 H z 4 5 . 9 d B
M # 1 - 5 0 0 H z 4 5 . 3 d B
M # 1 - 6 3 0 H z 4 6 d B
M # 1 - 8 0 0 H z 4 4 . 1 d B
M # 1 - 1 . 0 0 k H z 4 0 . 8 d B
M # 1 - 1 . 2 5 k H z 4 0 . 7 d B
M # 1 - 1 . 6 0 k H z 3 8 . 3 d B
M # 1 - 2 . 0 0 k H z 3 6 . 6 d B
M # 1 - 2 . 5 0 k H z 3 5 . 6 d B
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 27/41
F i l t e r S u m m a r y C h a r t - L e q
I n t e r s e c o n o f 1 0 t h A v e n u e a n d F o r d h a m S t r e e t : F i l t e r S u m m a r y C h a r t - L e q
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 28/41
I n t e r s e c t i o n o f N e l s o n R o a d a n d S u n s e t S t r e e t ( F l o w e r B i n )
9 / 2 7 / 2 0 1 4
I n f o r m a t i o n P a n e l
N a m e I n t e r s e c o n o f N e l s o n R o a d a n d S u n s e t S t r e e t ( F l o w e r B i n )
S t a r t T i m e 9 / 2 7 / 2 0 1 4 3 : 2 4 : 3 9 P M
S t o p T i m e 9 / 2 7 / 2 0 1 4 4 : 0 3 : 4 5 P M
D e v i c e N a m e B L H 0 4 0 0 1 3
M o d e l T y p e S o u n d P r o D L
D e v i c e F i r m w a r e R e v R . 1 3 H
C o m m e n t s
S u m m a r y D a t a P a n e l
D e s c r i p t i o n M e t e r V a l u e D e s c r i p t i o n M e t e r V a l u e
L e q 1 7 6 . 6 d B
E x c h a n g e R a t e 1 3 d B W e i g h n g 1 Z
R e s p o n s e 1 S L O W B a n d w i d t h 1 1 / 3
E x c h a n g e R a t e 2 3 d B W e i g h n g 2 A
R e s p o n s e 2 S L O W
L o g g e d D a t a C h a r t
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 29/41
M # 1 - 2 0 H z 6 2 d B
M # 1 - 2 5 H z 5 9 . 5 d B
M # 1 - 3 1 . 5 H z 5 7 . 5 d B
M # 1 - 4 0 H z 5 9 . 3 d B
M # 1 - 5 0 H z 5 7 . 2 d B
M # 1 - 6 3 H z 6 1 . 4 d B
M # 1 - 8 0 H z 5 8 . 9 d B
M # 1 - 1 0 0 H z 6 3 . 2 d B
M # 1 - 1 2 5 H z 5 6 . 3 d B
M # 1 - 1 6 0 H z 5 3 . 1 d B
M # 1 - 2 0 0 H z 5 5 . 9 d B
M # 1 - 2 5 0 H z 5 2 . 3 d B
M # 1 - 3 1 5 H z 5 3 . 4 d B
M # 1 - 4 0 0 H z 5 4 . 2 d B
M # 1 - 5 0 0 H z 5 2 . 2 d B
M # 1 - 6 3 0 H z 5 0 . 4 d B
M # 1 - 8 0 0 H z 4 6 . 9 d B
M # 1 - 1 . 0 0 k H z 4 5 . 5 d B
M # 1 - 1 . 2 5 k H z 4 5 . 2 d B
M # 1 - 1 . 6 0 k H z 4 4 . 6 d B
M # 1 - 2 . 0 0 k H z 4 5 . 5 d B
M # 1 - 2 . 5 0 k H z 4 7 . 3 d B
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 30/41
F i l t e r S u m m a r y C h a r t - L e q
I n t e r s e c o n o f N e l s o n R o a d a n d S u n s e t S t r e e t ( F l o w e r B i n ) : F i l t e r S u m m a r y C h a r t - L e q
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 31/41
APPENDIX B
Observation Logs
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 32/41
Page 1 of 1 Job # 25147105
SOUND LEVEL METER READINGS
LOCATION: 3200 West Block of Nelson Road at Highway 36 DATE: September 27, 2014
WEATHER: Sunny, 66°F, very light wind
CALIBRATION DATA:
Brand & Model No. Soundpro DL-1-1/3 SLM SLM Number:BLH40013
CALIBRATION: Pre-Calibration Post-Calibration
DATE: 9/27/14 9/27/14
TIME: 0857 1606
CALIBRATOR
LEVEL:
dBA
114
dBA
114
SLM READING: dBA
114
dBA
114.2
LOCATION REMARKS TIME SLM READING
(dBA)
S i d e o fr o a d
C a r s p a s s i n g 0 9 0 0 7 5
C a r 0 9 0 3 6 9 . 6 , 7 6
K i n g A i r a t 1 2 , 5 0 0 f e e t e l e v a t i o n 0 9 1 3 6 8
C a r p a s s i n g 0 9 1 5 6 9
B i g p l a n e 0 9 1 7 7 2 . 4
C a r p a s s i n g 0 9 2 0 7 2 . 4
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 33/41
Page 1 of 1 Job # 25147105
SOUND LEVEL METER READINGS
LOCATION: Intersection of North 65th Street and Galatia Road DATE: September 27, 2014
WEATHER: Sunny, 68°F, very light wind
CALIBRATION DATA:
Brand & Model No. Soundpro DL-1-1/3 SLM SLM Number:BLH40013
CALIBRATION: Pre-Calibration Post-Calibration
DATE: 9/27/14 9/27/14
TIME: 0857 1606
CALIBRATOR
LEVEL:
dBA
114
dBA
114
SLM READING: dBA
114
dBA
114.2
LOCATION REMARKS TIME SLM READING
(dBA)
O n b r i d g eo v e r c r e e ko n 6 5
t h
T r a c t o r p a s s i n g 1 0 0 0
O t t e r 1 0 0 17 4 . 7 , 6 7 . 3 ,7 1 . 2 , 7 3 . 6 ,7 6 . 1 , 7 5 . 4
S i n g l e e n g i n e s m a l l p l a n e f l y i n g l o w 1 0 0 3 6 7 . 2 , 6 9 . 2
O t t e r 1 0 0 6 7 0 . 9
Y e l l o w s i n g l e e n g i n e p l a n e f l y i n g l o w 1 0 0 7 7 3 . 1 , 6 8 . 9
K i n g A i r d e s c e n d i n g 1 0 0 7 6 1 . 1
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 34/41
Page 1 of 2 Job # 25147105
SOUND LEVEL METER READINGS
LOCATION: Field behind Little Leaf Court, Nelson Park Subdivision DATE: September 27, 2014
WEATHER: Sunny, 72°F, very light wind
CALIBRATION DATA:
Brand & Model No. Soundpro DL-1-1/3 SLM SLM Number:BLH40013
CALIBRATION: Pre-Calibration Post-Calibration
DATE: 9/27/14 9/27/14
TIME: 0857 1606
CALIBRATOR
LEVEL:
dBA
114
dBA
114
SLM READING: dBA
114
dBA
114.2
LOCATION REMARKS TIME SLM READING
(dBA)
H a w k i n sD r i v e P a r k ,n e a r c r e e k
S m a l l w h i t e p l a n e 1 0 4 8 6 3 . 2
K i n g A i r a s c e n d i n g 1 0 4 9 5 9 . 9
S m a l l y e l l o w p l a n e d e s c e n d i n g 1 0 5 0 6 0 . 9 , 6 4 . 3
S i n g l e e n g i n e w h i t e p l a n e a s c e n d i n g 1 0 5 4 6 5 . 3 , 6 6 . 9
S i n g l e e n g i n e w h i t e p l a n e 1 0 5 6 6 7 . 6 , 6 5
L a r g e s i n g l e e n g i n e p l a n e 1 0 5 7 7 0 . 3 , 7 0 . 7
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 35/41
Page 1 of 2 Job # 25147105
LOCATION REMARKS TIME SLM READING
(dBA)
H a w k i n sD r i v e P a r k ,
n e a r c r e e k
O t t e r a n d K i n g A i r o v e r h e a d 1 1 2 5 6 1 . 1
O t t e r a n d K i n g A i r d e s c e n d i n g 1 1 2 66 1 . 6 , 6 3 . 5 ,6 8 . 2 , 7 0 . 3
S m a l l s i n g l e e n g i n e p l a n e 1 1 3 0 6 3 . 8 , 6 4 . 4
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 36/41
Page 1 of 1 Job # 25147105
SOUND LEVEL METER READINGS
LOCATION: Intersection of Gunbarrel Rd and Mt. Sherman Rd DATE: September 27, 2014
WEATHER: Sunny, 75°F, very light wind
CALIBRATION DATA:
Brand & Model No. Soundpro DL-1-1/3 SLM SLM Number:BLH40013
CALIBRATION: Pre-Calibration Post-Calibration
DATE: 9/27/14 9/27/14
TIME: 0857 1606
CALIBRATOR
LEVEL:
dBA
114
dBA
114
SLM READING: dBA
114
dBA
114.2
LOCATION REMARKS TIME SLM READING
(dBA)
N e a r h o u s e K i n g A i r 1 1 5 66 2 . 9 , 5 5 . 1 ,5 7 . 7 , 6 1 . 5 ,
6 4 . 9
S m a l l s i n g l e e n g i n e p l a n e f r o mB o u l d e r A i r p o r t
1 1 5 8 5 9 . 1
P i c k u p t r u c k p a s s i n g 1 2 1 5 6 8 . 8
K i n g A i r 1 2 1 95 7 . 8 , 5 5 . 2 ,6 1 . 6 , 6 3 . 6 ,
6 1 . 4
K i n g A i r d e s c e n d i n g 1 2 2 4
O t t e r 1 2 3 16 3 . 4 , 6 8 . 2 ,6 1 8 6 3 5
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 37/41
Page 1 of 2 Job # 25147105
SOUND LEVEL METER READINGS
LOCATION: Intersection of 10th Avenue and Fordham Street DATE: September 27, 2014
WEATHER: Sunny, 82°F, light wind
CALIBRATION DATA:
Brand & Model No. Soundpro DL-1-1/3 SLM SLM Number:BLH40013
CALIBRATION: Pre-Calibration Post-Calibration
DATE: 9/27/14 9/27/14
TIME: 0857 1606
CALIBRATOR
LEVEL:
dBA
114
dBA
114
SLM READING: dBA
114
dBA
114.2
LOCATION REMARKS TIME SLM READING
(dBA)
N E C o r n e ro f g o l fc o u r s e
S m a l l s i n g l e e n g i n e p l a n e 1 4 0 9 7 8 . 1
L a w n m o w e r 1 4 0 9 7 6 . 5
J e t o v e r h e a d 1 4 1 27 3 . 3 , 7 8 . 6 ,
7 7 . 3
O t t e r d e p l o y i n g s k y d i v e r s 1 4 1 5 7 1 . 2
O t t e r p l a n e d e s c e n d i n g 1 4 1 76 4 . 2 , 6 8 . 4 ,6 4 . 9 , 6 6 . 7
J e t o v e r h e a d 1 4 1 86 8 . 4 , 6 1 . 6 ,6 5 . 8 , 6 2 . 8
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 38/41
Page 2 of 2 Job # 25147105
LOCATION REMARKS TIME SLM READING
(dBA)
N E C o r n e ro f g o l f
c o u r s e
O t t e r d o i n g “ h o p a n d p o p ” 1 4 5 0
S m a l l s i n g l e e n g i n e y e l l o w p l a n e 1 4 5 16 8 . 4 , 7 7 . 8 ,
7 9 . 7
O t t e r d e p l o y i n g s k y d i v e r s 1 4 5 2 6 4 . 7 , 6 2 . 7
K i n g A i r a s c e n d i n g 1 4 5 37 2 . 3 , 7 8 ,
8 1 . 9 , 7 6 . 2
K i n g A i r d e p l o y i n g s k y d i v e r s 1 5 0 1 6 1 . 2
K i n g A i r d e s c e n d i n g 1 5 0 4
6 3 . 6 , 6 7 . 8 ,
6 8 . 3 , 6 9 . 6
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 39/41
Page 1 of 1 Job # 25147105
SOUND LEVEL METER READINGS
LOCATION: Intersection of Nelson Road and Sunset Street DATE: September 27, 2014
WEATHER: Sunny, 88°F, windy
CALIBRATION DATA:
Brand & Model No. Soundpro DL-1-1/3 SLM SLM Number:BLH40013
CALIBRATION: Pre-Calibration Post-Calibration
DATE: 9/27/14 9/27/14
TIME: 0857 1606
CALIBRATOR
LEVEL:
dBA
114
dBA
114
SLM READING: dBA
114
dBA
114.2
LOCATION REMARKS TIME SLM READING
(dBA)
F l o w e r B i n K i n g A i r a s c e n d i n g 1 5 3 07 1 . 8 , 6 9 ,
7 4 . 1 , 6 6 . 9
C a r p a s s i n g 1 5 3 2 6 8
C a r p a s s i n g 1 5 3 5 7 5 . 2 , 6 8 . 3
K i n g A i r d e p l o y i n g s k y d i v e r s 1 5 3 8 7 1 . 5 , 7 4 . 5
O t t e r a s c e n d i n g 1 5 3 8
7 1 . 5 , 7 2 . 7 ,
7 6 . 1 , 8 2 . 2 ,8 6 . 5 , 8 5 . 5
R o a d n o i s e 1 5 2 9 7 4 . 5 , 8 3 . 2
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 40/41
APPENDIX C
Exhibit A2 – Approximate Noise Survey Locations
7/21/2019 Terracon Longmont Airport Noise Report
http://slidepdf.com/reader/full/terracon-longmont-airport-noise-report 41/41
APPROXIMATE NOISE SURVEY LOCATIONS
VANCE BRAND MUNICIPAL AIRPORT229 AIRPORT ROAD
LONGMONT, COLORADO A2
10625 W. I-70 Frontage Rd. N. Wheat Ridge, CO 80033
PH. (303) 423-3300 FAX. (303) 423-3353
25147105
2/4/2015
KLS
KLS
TAB
TAB
N.T.S.
Project Manager:
Drawn by:
Checked by:
Approved by:
Project No.
Scale:
File Name:
Date:
Exhibit
Exhibit A2
Nelson Rd. atHwy. 36
DIAGRAM IS FOR GENERAL LOCATIONONLY, AND IS NOT INTENDED FOR
CONSTRUCTION PURPOSES
Vance Brand
MunicipalAirport
N. 65th St. &
Galatia Rd.
field behind
Little Leaf Court
Nelson Rd. &
Sunset St.
(Flower Bin)
10th Ave. &
Fordham St.
Gunbarrel Rd. &Mt. Sherman Rd.
Top Related