Terracon Longmont Airport Noise Report

7/21/2019 Terracon Longmont Airport Noise Report

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Noise Survey

Vance Brand Municipal Airport

229 Airport Road

Longmont, Colorado

February 5, 2015

Terracon Project No. 25147105



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



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



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



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




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




Intersection of North 65th Street and Galatia Road

Date Time Activity



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



Average 71.1

Field behind Little Leaf Court, Nelson Park Subdivision

Date Time Activity



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




Intersection of Gunbarrel Road and Mount Sherman Road

Date Time Activity



9/27/14 1159 King Air above and single engine plane from Boulder

Airport above

62.8




1219 Pickup truck passing and King Air above 65.0

1224 King Air descending 58.8


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



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




Intersection of Nelson Road and Sunset Street (Flower Bin)

Date Time Activity



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



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




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.



APPENDIX A

Exhibit A1- Sound Level Readings at Six Client-selected Locations



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



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



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



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


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



C o m m e n t s



L e q 1 7 1 . 7 d B








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




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



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


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



C o m m e n t s



L e q 1 6 6 . 8 d B









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



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



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


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



C o m m e n t s



L e q 1 6 4 . 3 d B








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




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



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


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



C o m m e n t s



L e q 1 7 1 . 7 d B








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




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



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


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



C o m m e n t s



L e q 1 7 6 . 6 d B








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




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



APPENDIX B

Observation Logs



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



Page 1 of 1 Job # 25147105


LOCATION: Intersection of North 65th Street and Galatia Road DATE: September 27, 2014


CALIBRATION DATA:



DATE: 9/27/14 9/27/14

TIME: 0857 1606

CALIBRATOR

LEVEL:

dBA

114

dBA

114

SLM READING: dBA

114

dBA

114.2


(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



Page 1 of 2 Job # 25147105


LOCATION: Field behind Little Leaf Court, Nelson Park Subdivision DATE: September 27, 2014


CALIBRATION DATA:



DATE: 9/27/14 9/27/14

TIME: 0857 1606

CALIBRATOR

LEVEL:

dBA

114

dBA

114

SLM READING: dBA

114

dBA

114.2


(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



Page 1 of 2 Job # 25147105


(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



Page 1 of 1 Job # 25147105


LOCATION: Intersection of Gunbarrel Rd and Mt. Sherman Rd DATE: September 27, 2014


CALIBRATION DATA:



DATE: 9/27/14 9/27/14

TIME: 0857 1606

CALIBRATOR

LEVEL:

dBA

114

dBA

114

SLM READING: dBA

114

dBA

114.2


(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



Page 1 of 2 Job # 25147105


LOCATION: Intersection of 10th Avenue and Fordham Street DATE: September 27, 2014

WEATHER: Sunny, 82°F, light wind

CALIBRATION DATA:



DATE: 9/27/14 9/27/14

TIME: 0857 1606

CALIBRATOR

LEVEL:

dBA

114

dBA

114

SLM READING: dBA

114

dBA

114.2


(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



Page 2 of 2 Job # 25147105


(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



Page 1 of 1 Job # 25147105


LOCATION: Intersection of Nelson Road and Sunset Street DATE: September 27, 2014

WEATHER: Sunny, 88°F, windy

CALIBRATION DATA:



DATE: 9/27/14 9/27/14

TIME: 0857 1606

CALIBRATOR

LEVEL:

dBA

114

dBA

114

SLM READING: dBA

114

dBA

114.2


(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



APPENDIX C

Exhibit A2 – Approximate Noise Survey Locations



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.

Terracon Longmont Airport Noise Report

Documents

Transcript of Terracon Longmont Airport Noise Report