HomeMy WebLinkAbout26_NOISE_IMPACT_STUDY26.1Noise Impact Study
noise impact study
section
26
26.2 Bar Slash X Ranch LLC - Annexation and Stage Road PUD/Subdivision: Final Submission
In discussions in early February 2004 between
Applicant and the Soldner family and their repre -
sentatives, the Soldners indicated that the protec -
tion of their property from the noise impacts of
traffic was a very major concern, and likely to be
the deciding factor in resolving outstanding issues
with Bar/X Ranch and the City of Aspen.
As a result, Bar/X Ranch LLC engaged acoustic
engineer Jeff Geiler of Gwynfyd Consulting LLC in
Aurora to conduct a noise impact analysis of the
three road schemes under discussion at that time
(called Soldner A, B and C). The road location
suggested by the Soldners on the far East side of
the ranch meadow east of their property was unac-
ceptable to Bar/X Ranch LLC, but was included for
the sake of objective comparison.
Mr. Geiler was sent traffic trip generation figures
which Applicant’s engineers - Buckhorn Geotech
Inc. of Montrose - had evolved in discussion with
Aspen Community Development Department as
part of the final subdivision submission. Buckhorn
Geotech also sent Mr. Geiler their AutoCAD files
for the design of a road on the West side of the
Soldner property including the provision of a berm
as the road climbs up the slope near the Soldner
buildings which would both help reduce noise
impacts and screen the lights of traffic on this road
from Highway 82.
The noise impact analysis, which is included here
in its entirety, shows that the reduction of noise
levels at the Soldner buildings from moving the
access road from immediately east of the Soldner
property (as currently designed) to the far east side
of the ranch meadow is only 1 to 2 dB, which is not
a significant difference.
The reduction from putting the road west of the
Soldner property is 8 dB, however, which nearly
cuts the noise level in half. Fine tuning of the road
and berm design could probably reduce the impact
still further.
26.3Noise Impact Study
Soldner A
North100 feet Total trips per day = 1,749
Trips per day = 1,519
Trips per day = 230
5 foot berm
26.4 Bar Slash X Ranch LLC - Annexation and Stage Road PUD/Subdivision: Final Submission
Soldner B
North100 feet Total trips per day = 1,749
Trips per day = 1,749
26.5Noise Impact Study
Soldner C
North100 feet Total trips per day = 1,749
Trips per day = 1,749
Trips per day = 1,519Trips per day = 230
26.6 Bar Slash X Ranch LLC - Annexation and Stage Road PUD/Subdivision: Final Submission
Soldner Property &
Affordable Housing Village
Aspen, Colorado
Traffic Noise Modeling Report
February 19, 2004
26.7Noise Impact Study
18012 E. LOYOLA PLACE • AURORA, COLORADO 80013 • PHONE: (303) 766-7100 • FAX: (303) 766-7104
February 19, 2004
Mr. John Lifton
Bar-X Ranch, LLC
216 West Colorado Avenue
Telluride, CO 81435
Re: Traffic Noise Modeling
Soldner Property
Dear John:
We modeled the noise levels due to traffic from the proposed affordable housing village. This involved entering
supplied site topographical data and expected traffic flow information into the Traffic Noise Modeling (TNM)
program. TNM is the only traffic noise modeling program approved by the United States Department of
Transportation, Federal Highway Administration.
There are three proposed schemes for providing access to the affordable housing village. Details showing plan
views and perspective views of each of these schemes are included in Appendix B. The following table details the
traffic flow data used with each scheme:
Traffic Flow Data
Road Traffic Volume Traffic Speed Flow Control
Scheme A
Stage Road North Bound 5 veh./hr. 45 mph None
Stage Road South Bound 5 veh./hr. 45 mph None
Access Road East Bound 32 veh./hr. 35 mph None
Access Road West Bound 32 veh./hr. 35 mph None
Scheme B
Stage Road North Bound 37 veh./hr. 45 mph None
Stage Road South Bound 37 veh./hr. 45 mph None
Access Road East Bound 32 veh./hr. 35 mph Stop
Access Road West Bound 32 veh./hr. 35 mph None
Scheme C
Stage Road North Bound 37 veh./hr. 45 mph None
Stage Road South Bound 37 veh./hr. 45 mph None
Access Road East Bound 32 veh./hr. 35 mph Stop
Access Road West Bound 32 veh./hr. 35 mph None
26.8 Bar Slash X Ranch LLC - Annexation and Stage Road PUD/Subdivision: Final Submission
February 19, 2004 Page 2
Based on this data, TNM was used to generate A-weighted sound level contours for each of the proposed access
road schemes. A-weighting sound levels are designed to approximate the sensitivity of the human ear when
listening to pure tones. These sound level contours are located in Appendix A. The sound level contours show the
expected noise impact on the Soldner property for each access road scheme.
The following tables can be used to assist in the qualitative understanding of what the state noise levels represent.
Examples of Sound Levels in Decibels
Level, dB(A) Sensory Response Type of Sound
120 Threshold of pain Jet Exhaust (close up)
110 Deafening Nearby riveter, auto horn
Jet Plane on take-off, freeway noise
90 Very Loud Noisy factory, noisy office,
80 average street noise
70 Loud Average radio or TV
60 Inside auto on highway
50 Moderate Average office, typical conversation
40 Private office
30 Faint Average auditorium
20 Quiet conversation, rustle of leaves
10 Very faint Whisper, Threshold of hearing
Audible Changes in Decibel Levels
Change in Level Subjective Response
1 dB Imperceptible Change
3 dB Just Barely Distinguishable
5 dB Clearly Noticeable Change
10 dB About Twice (or Half) as Loud
20 dB About 4 Times (or one Fourth) as Loud
Please call us, if you have any questions or comments.
Sincerely,
Jeff Geiler, P.E.
Principal/Acoustician
Enclosures:
Jeff
Geiler
Digitally
signed by Jeff
Geiler
DN: cn=Jeff
Geiler,
o=Gwynfyd
Consulting,
LLC, c=US
Date:
2004.02.19
10:40:36
-07'00'
Signatu
re Not
Verified
26.9Noise Impact Study
Appendix A
26.10 Bar Slash X Ranch LLC - Annexation and Stage Road PUD/Subdivision: Final Submission
2616800 2616900 2617000 2617100 2617200 2617300 2617400
Scheme A
Plan View
Run name: SoldnerA
Scale: 100 feet
Sheet 1 of 1 18 Feb 2004
Gwynfyd Consulting, LLC
Project/Contract No. Soldner
TNM Version 2.1.0, Feb 2003
Analysis By: Jeff Geiler, P.E.
Roadway:
Receiver:
Barrier:
Building Row:
Terrain Line:
Ground Zone: polygon
Tree Zone: dashed polygon
Contour Zone: polygon
Parallel Barrier:
Skew Section:
26.11Noise Impact Study
2616800 2616900 2617000 2617100 2617200 2617300 2617400
Scheme B
Plan View
Run name: SoldnerB
Scale: 100 feet
Sheet 1 of 1 18 Feb 2004
Gwynfyd Consulting, LLC
Project/Contract No. Soldner
TNM Version 2.1.0, Feb 2003
Analysis By: Jeff Geiler, P.E.
Roadway:
Receiver:
Barrier:
Building Row:
Terrain Line:
Ground Zone: polygon
Tree Zone: dashed polygon
Contour Zone: polygon
Parallel Barrier:
Skew Section:
26.12 Bar Slash X Ranch LLC - Annexation and Stage Road PUD/Subdivision: Final Submission
2616800 2616900 2617000 2617100 2617200 2617300 2617400
Plan View
Run name: SoldnerC
Scale: 100 feet
Sheet 1 of 1 19 Feb 2004
Project/Contract No.
TNM Version 2.1.0, Feb 2003
Analysis By:
Roadway:
Receiver:
Barrier:
Building Row:
Terrain Line:
Ground Zone: polygon
Tree Zone: dashed polygon
Contour Zone: polygon
Parallel Barrier:
Skew Section:
Scheme C
26.13Noise Impact Study
Appendix B
26.14 Bar Slash X Ranch LLC - Annexation and Stage Road PUD/Subdivision: Final Submission
6600 2616800 2617000 2617200 2617400 2617600 2617800 2618000
Scheme A
Plan View
Run name: SoldnerA
Scale: 200 feet
Sheet 1 of 1 19 Feb 2004
Gwynfyd Consulting, LLC
Project/Contract No. Soldner
TNM Version 2.1.0, Feb 2003
Analysis By: Jeff Geiler, P.E.
Roadway:
Receiver:
Barrier:
Building Row:
Terrain Line:
Ground Zone: polygon
Tree Zone: dashed polygon
Contour Zone: polygon
Parallel Barrier:
Skew Section:
26.15Noise Impact Study
Scheme A
Perspective View
Run name: SoldnerA
Scale: <DNA - due to perspective>
Sheet 1 of 1 19 Feb 2004
Gwynfyd Consulting, LLC
Project/Contract No. Soldner
TNM Version 2.1.0, Feb 2003
Analysis By: Jeff Geiler, P.E.
Roadway:
Receiver:
Barrier:
Building Row:
Terrain Line:
Ground Zone: polygon
Tree Zone: dashed polygon
Contour Zone: polygon
Parallel Barrier:
Skew Section:
26.16 Bar Slash X Ranch LLC - Annexation and Stage Road PUD/Subdivision: Final Submission
2616600 2616800 2617000 2617200 2617400 2617600 2617800 2618000
Scheme B
Plan View
Run name: SoldnerB
Scale: 200 feet
Sheet 1 of 1 19 Feb 2004
Gwynfyd Consulting, LLC
Project/Contract No. Soldner
TNM Version 2.1.0, Feb 2003
Analysis By: Jeff Geiler, P.E.
Roadway:
Receiver:
Barrier:
Building Row:
Terrain Line:
Ground Zone: polygon
Tree Zone: dashed polygon
Contour Zone: polygon
Parallel Barrier:
Skew Section:
26.17Noise Impact Study
Scheme B
Perspective View
Run name: SoldnerB
Scale: <DNA - due to perspective>
Sheet 1 of 1 19 Feb 2004
Gwynfyd Consulting, LLC
Project/Contract No. Soldner
TNM Version 2.1.0, Feb 2003
Analysis By: Jeff Geiler, P.E.
Roadway:
Receiver:
Barrier:
Building Row:
Terrain Line:
Ground Zone: polygon
Tree Zone: dashed polygon
Contour Zone: polygon
Parallel Barrier:
Skew Section:
26.18 Bar Slash X Ranch LLC - Annexation and Stage Road PUD/Subdivision: Final Submission
2616800 2616900 2617000 2617100 2617200 2617300 2617400 2617500 2617600 2617700
Scheme C
Plan View
Run name: SoldnerC
Scale: 100 feet
Sheet 1 of 1 19 Feb 2004
Gwynfyd Consulting, LLC
Project/Contract No. Soldner
TNM Version 2.1.0, Feb 2003
Analysis By: Jeff Geiler, P.E.
Roadway:
Receiver:
Barrier:
Building Row:
Terrain Line:
Ground Zone: polygon
Tree Zone: dashed polygon
Contour Zone: polygon
Parallel Barrier:
Skew Section:
26.19Noise Impact Study
Scheme C
Perspective View
Run name: SoldnerC
Scale: <DNA - due to perspective>
Sheet 1 of 1 19 Feb 2004
Gwynfyd Consulting, LLC
Project/Contract No. Soldner
TNM Version 2.1.0, Feb 2003
Analysis By: Jeff Geiler, P.E.
Roadway:
Receiver:
Barrier:
Building Row:
Terrain Line:
Ground Zone: polygon
Tree Zone: dashed polygon
Contour Zone: polygon
Parallel Barrier:
Skew Section:
26.20 Bar Slash X Ranch LLC - Annexation and Stage Road PUD/Subdivision: Final Submission
26.21Noise Impact Study
26.22 Bar Slash X Ranch LLC - Annexation and Stage Road PUD/Subdivision: Final Submission