HomeMy WebLinkAbout1.13 Noise study reportMRI May 2012
Appendix L
Noise Study Report
6 Limited Impact Review Appendix L
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1IFNVIRONMENTAL
ACOUSTICS AND VIBRATION CONSULTING
MRI WASTE TRANSFER/RECYCLE CENTER NOISE STUDY REPORT
To: Don Van Devander— MRI DATE: March 19, 2012
FROM: Mike Hankard — HEI PROJECT: MRI WT/RC Carbondale
SUBJECT: Initial Noise Analysis Results
Jeff Cerjan - Hankard Environmental
cc: Dave Kotz - SGM
This memorandum describes Hankard Environmental's assessment of noise impacts from the
proposed MRI Waste Transfer/Recycle Center (WT/RC) in Carbondale, Colorado. We toured
the site and measured noise levels from MRI vehicles, investigated the land use and
corresponding noise limits on adjacent parcels of land, and predicted noise levels from
proposed operations at adjacent parcels.
APPLICABLE NOISE REGULATIONS
Noise emissions from the proposed MRI WT/RC must adhere to Garfield County Unified Land
Use Resolution, Article VII, Section 7-810, Additional Standards Applicable to Industrial Use.
Paragraph E of Section 7-810 requires the "Volume of sound generated shall comply with the
standards set forth in the Colorado Revised Statutes." Noise levels are regulated in the
Colorado Revised Statutes (CRS) in Title 25, Article 12, Noise Abatement. CRS §25-12 noise limits
are listed in Table 1, and depend on the time of day of operations, the land use of adjacent
properties, and the type of sound from the proposed operations.
Operations taking place during 'nighttime hours', which are defined by CRS §25-12 as 7:00 p.m.
to 7:00 a.m., are subject to lower noise limits, and cannot invoke the caveat in CRS §25-12 stating
'During the daytime, the noise level limit can be increased by 10 dBA for 15 minutes in any one-
hour period'. To our understanding, the only proposed 'nighttime' operation is that of
trash/recycle trucks starting, idling, and leaving the site between 5:00 and 7:00 a.m. All other
proposed operations will take place during the daytime (7:00 a.m. to 7:00 p.m.). For all hours of
the day, noise level limits are decreased by 5 dBA for intermittent, shrill type sounds, which on
this project primarily applies to back-up alarms ('white -noise' back-up alarms as approved by
OSHA are recommended, which are not impulsive or shrill).
The limits need to be met at a point 25 feet or more outside of the project boundary (property).
Hankard Environmental toured the site, reviewed Garfield County land use information, and
reviewed aerial photographs to determine the adjacent land use. The results of this analysis are
shown in Figure 1, which shows 11 adjacent properties and their land use for the purposes of
the noise analysis. Also shown in Figure 1 is the location of the nearest residences. The
corresponding noise limits for each parcel are listed in Table 2, for both daytime and nighttime
periods.
COLORADO • WISCONSIN • MAINE
phone (303) 666-0617 • www.hankardinc.com • fax (303) 600-0282
9 Commercial 870
1,900
60 55
MRI CARBONDALE WT/RC INITIAL NOISE RESULTS HANKARD ENVIRONMENTAL INC.
TABLE 1 — Maximum Permissible Noise Levels (dBA) — Colorado Revised Statutes §25-12
Zone
Daytime (11'(2) Nighttime (2)
(7:00 a.m. to 7:00 p.m.) (7:00 p.m. to 7:00 a.m.)
Residential
55 50
Commercial
60 55
Light Industrial
70 65
Industrial
80 75
(1) During the daytime, noise levels can be increased by 10 dBA for 15 minutes in any one-hour
(2) Noise level limit decreased by 5 dBA for intermittent, shrill type sounds
TABLE 2 — Zoning and Land use of Properties Adjacent to Proposed WT/RC
Parcel
(see Figure 1)
Distance to
Land Use Trucks
(feet)
Distance to
Building
(feet)
Daytime Noise
Level Limit
(dBA)
Nighttime
Noise Level
Limit
(dBA)
1 Industrial
300 150 80
75
2 Residential
1,150 1,250 55
50
3 Exempt (n/a)(1)
890 930 60
55
EL 4A n/a(1)
230 350 0 60 55
5 Agricultural(2)
220 360 60 55
• 6 Residential
1_3104
6220 55
50
7 Residential
600 960 55 50
WI%
Residential
820
• 1,170
r
10 Agricultural(2) 600
460 60 55
11 Residential 840
890 55 50
(1) This is Garfield Counties the Land Zoning classification for this parcel. Assumed agriculture
(commercial) for the purposes of the noise study.
(2) Noise limits for 'Commercial' land use applied to parcels zoned and used as agricultural.
MARCH 20, 2012
PAGE 2 OF 6
MRI CARBONDALE WT/RC INITIAL NOISE RESULTS
HANKARD ENVIRONMENTAL INC.
Agricultural
Residential
N/A
Public Service Ca
Residential
Federal
Exempt
Non -Res
LISA
Paved Tr-Z-
_
rZ
- nearest residences
Exempt
n of Carbondale
Agricultural
Residential
N/A
Cattle Ca, Lt.0
eC�
J
Eio 0
MRI SITE
Industrial
Agricultural
Commercial
Residential
Industrial
Wasteland
FIGURE 1 — LOCATION AND LAND USE OF ADJACENT PROPERTIES
Trash Loaclou
FIGURE 2 — LOCATION OF NOISE MEASUREMENTS AND SOURCES
MARCH 20, 2012
PAGE 3 OF 6
MRI CARBONDALE WT/RC INITIAL NOISE RESULTS HANKARD ENVIRONMENTAL INC.
NOISE LEVEL PREDICTIONS
To our understanding, the noise producing equipment to be employed on the proposed project
includes:
1. Approximately ten (10) trash/recycle trucks starting, idling during the 'nighttime', with
only five operating at any one time. The trucks will be parked overnight in the area
shown in Figure 2, and will be started, idled, and then leave the site around the south
side of the existing building. Noise from trucks leaving the site was not accounted for,
as it is our opinion that once on CR100 they are on public right of way.
2. Trash and recycle trucks entering the site, dropping off material inside the existing
building, and exiting the site during the daytime (no more than approximately four per
hour).
3. Approximately one WB -67 truck entering the site, being loaded inside the existing
building, and leaving the site during the daytime (no more than approximately one per
hour).
4. One loader, two skid -steers, one baler, and one sorter operating inside the building
during the daytime.
A sound power level (PWL, noise emission factor) was developed for each of these sources
using a combination of measurements and published sources. The PWL is independent of
distance from the source, ground conditions, etc. It is a measure of how much sound energy is
radiating from the source in all directions. The following describes how the PWL for each
source was derived:
1. Noise levels from five trash/recycle trucks starting and idling and driving off was
measured at the site on March 12, 2012. Referring to Figure 2, noise levels were
measured at M1, which is located approximately 225 feet from the truck parking area.
The measured sound pressure level was 42 dBA, which converts to a sound power level
of 87 dBA.
2. The noise level of trucks driving away was measured at M1 and found to be 47 dBA.
When considering that only 2 to 3 trucks will be driving on site at any one time, this also
converts to a sound power level of 87 dBA.
3. A sound pressure level of 75 dBA at a distance of 50 feet was assumed for a WB -67 truck
driving on the site at a yard speed of less than 35 mph. This converts to a sound power
level of 107 dBA.
4. One loader, two skid -steers, one baler, and one sorter operating inside the building
during the daytime. Assuming a sound pressure level inside the building of 90 dBA
(conservatively high based on measurements on site and inside other buildings), the
sound transmission loss of a steel building, and an effective area of 4,000 square feet, this
converts this converts to a sound power level of 90 dBA.
These sound power levels were projected to determine noise levels at the boundaries of each
parcel shown in Figure 1 and listed in Table 2. The predictions were made using the methods
outlined by ISO 9613-2. The predicted daytime and nighttime noise levels are shown in Tables
3 and 4, respectively. Also shown in each table are the noise limits applicable to each parcel,
MARCH 20, 2012
PAGE 4 OF 6
MRI CARBONDALE WT/RC INITIAL NOISE RESULTS HANKARD ENVIRONMENTAL INC.
and whether or not the predicted levels are equal to or lower than the limits. In all cases they
are in compliance. In addition, noise levels at the residences, which are located further from the
proposed operations than are the property boundaries, will be quieter, and also in compliance.
TABLE 3 — Noise Compliance Assessment for Daytime Operations
Dist. from Center of
Parcel No. Type Transfer Facility Bldg
(feet)
Noise Level of
Interior Operations
and Trucks
(dBA)
Applicable In
Limit Compliance
(dBA) (Yes/No)
1 Industrial 150 66 80 YES
2 Res 1,250 47 55 YES
3 Exempt 930 50 60 YES
4 n/a 350 58 60 YES
5 Ag 360 58 60 YES
6 Res 620 53 55 YES
7 Res 960 49 55 YES
8 Res 1,170 48 55 YES
9 Comm 1,900 44 60 YES
10 Ag 460 56 60 YES
11 Res 890 50 55 YES
TABLE 4 — Noise Compliance Assessment for Nighttime Operations
Dist. from Front of Noise Level Applicable In
Parcel No. Type Truck Parking of Trucks Limit Compliance
(feet) (dBA) (dBA) (Yes/No)
1 Industrial 300 39 75 YES
2 Res 1,150 27 50 YES
3 Exempt 890 30 55 YES
4 n/a 230 41 55 YES
5 Ag 220 42 55 YES
6 Res 310 39 50 YES
7 Res 600 33 50 YES
8 Res 820 30 50 YES
9 Comm 870 30 55 YES
10 Ag 600 33 55 YES
11 Res 840 30 50 YES
MARCH 20, 2012
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MRI CARBONDALE WT/RC INITIAL NOISE RESULTS HANKARD ENVIRONMENTAL INC.
CONCLUSIONS
Based on our analysis, the noise levels expected from the proposed WT/RC in Carbondale,
Colorado will be in compliance with the applicable provisions of Garfield County's Land Use
Resolution, as well as CRS §25-12, assuming the following::
1. The trash/recycle trucks will be parked overnight in the general location shown in Figure
2, and no more than five trucks will be operated at any one time before 7:00 a.m. or after
7:00 p.m.
2. No louder operations than truck startup and idle should be permitted before 7:00 a.m. or
after 7:00 p.m.
3. The use of quieter OSHA approved white noise back up alarms is recommended for all
mobile equipment, and/or operations should be organized such that limited backing
occurs on a regular basis.
4. All loading and unloading of materials should take place inside the building. Any
penetrations on the north side of the existing building should be equipped with automatic
doors that provide similar noise reduction as the building structure itself
MARCH 20, 2012
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