HomeMy WebLinkAbout20171780.tiffengineering
dynamics
e C II incorporated
24 May 2017
Mr. Rob Laird
Resource Manager
Asphalt Specialties Co., Inc.
10100 Dallas St., Henderson, CO 80640
RE: Asphalt Plant and Recycle Crusher
Noise Measurements and Predicted Levels
ASCI North Multiple Use Development
EDI Job # C-4158
Dear Mr. Laird:
Page 1 of 18
Voice: 303 289-8555
Engineering Dynamics, Inc. has completed a noise compliance analysis for the proposed new Asphalt Specialties
(ASCI) North Multiple Use Development industrial operations located at the southwest corner of WCR 6 and 13. This
report describes the predicted asphalt batch plant and recycle crusher sound levels at the ASCI owned property lines
and nearby properties (commercial and residential).
1.0 Background
Figure 1.1 shows a vicinity map of the ASCI property. The proposed facility is located on the western —1/3 of
the property as shown in Figure 1.2. The location of the asphalt batch plant and recycle crusher are shown on
Figure 1.2.
The proposed plan to limit noise exposure to adjacent properties is,
a. To construct material stockpiles on four sides of the recycle crusher.
b. To locate the asphalt batch plant near the north -south center of the site and to locate material
stockpiles on the east side of the asphalt batch plant
c. Site layout so that trucks using the batch plant do not have to back up.
Proposed hours of operation for the industrial facilities will be,
a. Monday thru Friday, 6:00 am to 4:00 pm
b. Saturdays, during peak construction season for the asphalt plant, 6am to —2pm.
c. Asphalt batch plant is generally shut down entirely for most of December, all of January and
February and some of March.
d. Recycle crusher operations can continue year-round, except that during the December to
February time period recycle crusher operations may not occur on a daily basis.
e. All facilities closed on Sundays and Holidays.
2.0 Applicable Noise Ordinance / Law
State of Colorado Noise Law, 25-12-103. Maximum permissible noise levels, as adopted by Weld County.
(1) Every activity to which this article is applicable shall be conducted in a manner so that any noise
produced is not objectionable due to intermittence, beat frequency, or shrillness. Sound levels of
noise radiating from a property line at a distance of twenty-five feet or more therefrom in excess of
the db(A) established for the following time periods and zones shall constitute prima facie evidence
that such noise is a public nuisance, see Table 2.0 below.
3925 S. Kalamath St., Englewood, Colorado 80110 • voice: 303-761-4367 • www.engdynamics.com
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2017-1780
engineering
dynamics
e II incorporated
Asphalt Specialties — ASCI
24 May 2017
Page 2 of 18
Table 2.0: State of Colorado Residential and Light Industrial Noise Limits
Zone
7am to next 7pm
7pm to next 7am
Residential
55 dBA
50 dBA
Light industrial
70 dBA
65 dBA
(2)
In the hours between 7:00 a.m. and the next 7:00 p.m., the noise levels permitted in subsection (1)
of this section may be increased by ten dBA for a period of not to exceed fifteen minutes in any one -
hour period.
NOTE: For the analysis herein, the Nighttime noise limits are used, because the Asphalt Batch Plant and
Recycle crusher operations are planned to start at 6am, and the nighttime noise limit periods are
from 7pm to 7am. Therefore, the morning 1 -hour of operation, from 6am to 7am, will be under the
Nighttime noise limits.
3.0 Typical Noise Levels
Table 3.1 shows some A -weighted noise levels of typical activities. For the average human an increase of the
measured noise level of 10 dB is Subjectively Perceived as being twice as loud or half as loud for a 10 dB
decrease. The decibel change at which the average human will indicate that the noise is just perceptibly louder
or perceptibly quieter is 3 dB.
A -weighted Noise Level (dBA) - the physical process of measuring sound with the same sensitivity to
frequency as that of the human ear. A sound level meter will have, inside it, an electrical circuit that allows
the meter to have the same sensitivity (response) to sound at different frequencies as the average human
ear. Noise ordinances and law are typically written in terms of dBA.
Ambient Noise - at a specified time, the all -encompassing sound associated with a given environment, being
usually a composite of sound from many sources at many directions, near and far, including the specific
sources of interest.
Background or Residual Noise - at a specified time, the all -encompassing sound associated with a given
environment, being usually a composite of sound from many sources at many directions, near and far,
remaining in a given location in a given situation when all uniquely identifiable discrete sound sources are
eliminated, rendered insignificant, or otherwise not included.
•Qualitative Description of Typically Occurring Noise
Sound
Level,
dB(A)
Type of Noise
Relative Loudness
(Human Judgement)
of Different Noise Levels
Subjective
Impression
of Noise
90
Motorcycle at 25'
32 times as loud
Very Loud
85
D8 Cat Dozer at 50 ft.
80
Diesel Truck, 40 mph at 50'
16 times as loud
Loud
75
Average Car, 40 mph at 25'
70
Vacuum Cleaner at 3'
8 times as loud
65
Conversation at 3'
60
Background Music
4 times as loud
55
Air Conditioning Unit at 15'
50
Quiet Residential
Twice as loud
45
Bird Calls
Quiet
40
Lower Limit Urban Daytime Ambient
Reference loudness
30
Background Quiet Suburban at Night
1/2 as loud
20
Quiet Whisper
1/4 as loud
Barely Audible
0
Threshold of Hearing
3925 S. Kalamath St., Englewood, Colorado 80110 • Voice: 303-761-4367 • www.engdynamics.com
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24 May 2017
Page 3 of 18
4.0 Asphalt Batch Plant and Recycle Crusher Noise Levels at the Existing ASCI Firestone Facility
The equipment which will be installed at the proposed ASCI development will be the same or nearly the same
as the existing equipment at the Asphalt Specialties facility in Firestone, Colorado. Therefore, to accurately
predict the level of noise from the proposed ASCI development, sound levels of existing equipment at the
Firestone facility were measured during typical operations. The sound level measurement instrumentation,
weather conditions and measurement results are presented below.
4.1 Measurement Instrumentation and Weather Conditions
Sound level measurements were made with a Larson Davis Model 831 (Type 1) Integrating Sound Level Meter.
The meter was configured to measure and record A -weighted Peak sound levels. The Model 831 was field
calibrated at 94.0 dB prior to the measurement sequence with a Larson Davis Model Cal200 sound level
calibrator. Post measurement sequence field calibration showed a 94.0 dB reading. Both the Model 831 and
the Cal200 had a current valid 1 -year calibration certificate at the time the measurements were taken.
Measurement Date — Wednesday 12 -Apr -17
Weather conditions during the measurements were,
Temperature ---21°C (70°F)
Wind Speeds — <5 mph.
Skies — clear.
4.2 Measured Levels
Sound levels of the asphalt batch plant and recycle crusher were taken on all four sides of each piece of
equipment at a distance of 100 feet from the geometric center of the equipment. Figure 4.2.1 is an aerial view
of the asphalt batch plant with measurement locations shown, and Figure 4.2.2 is an aerial view of the recycle
crusher with the measurement locations shown. Results of these measurements are shown in Table 4.2.
Table 4.2: Asphalt Batch Plant and Recycle crusher Sound Levels, Firestone Facilit
Equipment ID
Sound Levels at 100 feet, dBA
North
South
East
West
Asphalt Batch Plant
73
72
75
79
Recycle crusher
69
70
75
72
Note: At the existing Firestone facility the Asphalt Batch Plant is oriented north -to -south, while at the
proposed ASCI facility the Asphalt Batch Plant will be oriented east -to -west. This orientation shift has
been taken into account in the noise contour analysis.
5.0 Predicted Asphalt Batch Plant and Recycle Crusher Noise Levels at the Proposed ASCI North Multiple -
Use Development
The Asphalt Batch plant and Recycle Crusher sound levels at the ASCI property lines and nearest residential
and commercial properties were calculated with material stockpiles present. Figure 5.1 shows distances from
the asphalt batch plant and recycle crusher locations to nearest residences. Figure 5.2 shows the Industrial
daytime and nighttime noise contours around the Asphalt Bach Plant and the Recycle Crusher, with stockpiles
in place. Figure 5.2 also shows the residential daytime and nighttime noise contours around the Asphalt Bach
Plant and the Recycle Crusher, with stockpiles in place.
Predicted sound levels at the nearest residences and commercial locations shown in Figure 5.1 are listed in
Table 5.1. The predicted noise levels take into account sound attenuation from proposed stockpiles.
3925 S. Kalamath St., Englewood, Colorado 80110 • Voice: 303-761-4367 • www.engdynamics.com
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24 May 2017
Page 4 of 18
Inspection of Table 5.1 and Figures 5.2 show,
a. Table 5.1 shows that at nearby residences Asphalt Batch Plant and Recycle Crusher noise levels will
be at or below the Weld County and State of Colorado residential nighttime noise limit of 50 dBA.
b. Figure 5.2 shows that the predicted Light Industrial noise contours, are completely within the
Development and ASCI Owned site property boundaries, except for a small incursion onto the RV
storage facility to the northwest.
c. Figure 5.2 — also shows the extent of the residential daytime and nighttime, 50 and 55 dBA, noise
contours, which, extend off the ASCI site.
Table 5.1: Asphalt Batch Plant and Recycle crusher Combined Sound Levels, dBA
dBA
North Property Line (Development and ASCI Owned Property Line)
53
South Property Line (Development and ASCI Property Line)
51
East Property Line (ASCI Owned Property Line)
48
West Property Line (Development and ASCI Owned Property Line)
59
G Kirkmeyer Residence
47
Maxwell Residence
46
D Kirkmeyer Residence
46
Yongge Residence
49
Gutierrez Residence
44
RV Storage South Lot Office
49
6.0 Conclusions
It is EDI's understanding that the Weld County Planning department is requiring, as part of the Special Use
Permit approval, that Asphalt Specialties comply with the State of Colorado Daytime and Nighttime Light
Industrial noise limits of 70 and 65 dBA, 25 -feet from the ASCI North Multiple -Use Development property line.
The results of this analysis show that the proposed ASCI facility will comply with the Light Industrial Noise
Limits, at the ASCI property lines, for Asphalt Batch Plant and Recycle crusher operations. Predicted Asphalt
Batch Plant and Recycle crusher operations are below the Light Industrial Nighttime Noise Limits, except at
one location; there is a slight overlap of the 65 dBA contour onto the RV storage facility, to the northwest. The
RV storage facility has only one occupancy location, the facility office, which is located at the far northwest
corner of the property and is well outside the 65 dBA noise contour.
Additionally, this analysis shows that the predicted Asphalt Batch Plant and Recycle Crusher operations, noise
levels at the nearby residences, are at or below the Weld County and State of Colorado Residential Nighttime
noise limits of 50 dBA.
3925 S. Kalamath St., Englewood, Colorado 80110 • Voice: 303-761-4367 • www.engdynamics.com
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Asphalt Specialties — ASCI
24 May 2017
Page 5 of 18
If you have any questions, please contact me at our Englewood office.
Sincerely,
ENGINEERING DYNAMICS, INC.
Stuart D. McGregor, P.E.
President
3925 S. Kalamath St., Englewood, Colorado 80110 • Voice: 303-761-4367 • www.engdynamics.com
3925 S. Kalamath St., Englewood, Colorado 80110 • Voice: 303-761-4367 • www.engdynamics.com
r engineering
dynamics
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Asphalt Specialties - ASCI
24 May 2017
Page 7 of 18
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3925 S. Kalamath St., Englewood, Colorado 80110 • Voice: 303-761-4367 • www.engdynamics.com
Figure 4.2.1: Aerial View of Asphalt Batch Plant and Locations of Sound Level Measurements
3925 S. Kalamath St., Englewood, Colorado 80110 • Voice: 303-761-4367 • www.engdynamics.com
3925 S. Kalamath St., Englewood, Colorado 80110 • Voice: 303-761-4367 • www.engdynamics.com
3925 S. Kalamath St., Englewood, Colorado 80110 • Voice: 303-761-4367 • www.engdynamics.com
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Figure 5.2: Asphalt Batch Plant and Recycle Crusher 65 and 70 dBA Noise Contours, with Stockpiles in Place
3925 S. Kalamath St., Englewood, Colorado 80110 • Voice: 303-761-4367 • www.engdynamics.com
10 engineering
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24 May 2017
Page 12 of 18
Resume
Stuart D. McGregor, P.E.
President / Senior Engineer
Professional Experience: Mr. McGregor is president of Engineering Dynamics, Inc. His experience in acoustical
and vibration engineering encompasses analysis and modeling for environmental and building projects,
noise and vibration mitigation design recommendations, testing of structures and devices, presentation
before public deliberative bodies and testimony as an expert witness.
Mr. McGregor's noise and vibration engineering and testing experience covers are wide range of applications
from building acoustics related to mechanical systems and interior acoustics, environment noise,
measurements and modeling for a wide range projects from gravel pits and oil and gas wells, to automobile
race tracks and outdoor concert venues, seismic measurements, equipment vibration and simulated
environments testing.
Recent project experience covers:
Building Mechanical Systems — noise from building mechanical systems can make a project unusable for its
intended purpose. Over the last 20 -years I have been fortunate enough to work on a large number
of projects, for new construction and to mitigate noise issues on already constructed building, which
pushed the limits of squeezing mechanical systems into small spaces and used innovative
mechanical system designs. These opportunities have allowed me to see and analyze a wide
variety of mechanical systems and required some very creative solutions. These solutions have
been refined with the help of local mechanical HVAC engineers and contractors.
Work I have done for building mechanical systems has included acoustical analysis, design and
measurement of noise and vibration issues for new construction as well remediation for existing
problems, on residential, commercial, laboratory and industrial applications. Projects have included
work to minimize noise and vibration intrusion into occupied spaces from roof top and mechanical
room equipment, including chillers, cooling towers, exhaust fans, air handlers, pumps and
compressors, as well as noise mitigation for community noise impacts from roof top and ground
based mechanical equipment.
Building Interior Acoustics — begins with defining the acoustical goals for the specific project, which can vary
significantly depending on the space usage; multi -family residential has very different requirements
than open office spaces.
Work on building interior acoustical issues has covered with sound isolation between residential
spaces requiring the design / specification of demising wall and floor / ceiling assemblies that meet
the project Sound Transmission Class (STC) and Impact Insulation Class (IIC) requirements.
Acoustical requirements for commercial office spaces sound isolation between private offices and for
conference rooms, as well as appropriate Reverberation Times (lack of echoes) for open office
spaces. Noise issues for classrooms, lecture halls, and small theaters are typically limited to
appropriate Reverberation Times and minimization of HVAC related noise to enhance intelligibility of
the spoken word.
3925 S. Kalamath St., Englewood, Colorado 80110 • Voice: 303-761-4367 • www.engdynamics.com
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24 May 2017
Page 13 of 18
Environmental Noise Impact Analysis — this work begins either with a concept proposal for a proposed
project or an existing facility that has received noise or ground vibration complaints. Over the last
15 -years EDI has completed a majority of the environmental noise assessments for minerals
extraction projects, gravel pits, above ground equipment for mines, and noise permitting for gas
compressor stations in the Rocky Mountain Region. Some recent clients include The National Park
Service, BP / Amoco Production Company, Lafarge Industries, Aggregate Industries, Williams Filed
Services and other resource development companies.
Vibration Analysis — small levels of vibration from mechanical equipment or from occupant activities in a
building can result in significant audible noise issues or render sensitive scientific instrumentation
unusable. As part of EDI's building testing services we perform vibration measurement and analysis
on rotating equipment (motors, fans, pumps) diagnosis of vibration transmission in buildings from
mechanical equipment or scientific equipment, and designs for mitigation of vibration from sources
inside and outside a building.
Acoustics Teaching Experience — Mr. McGregor developed and has taught for approximately 8 -years a noise
certification course geared towards the requirements that city, county and state police officers, code
enforcement and planners have to enforce local noise laws and ordinances. As part of his
membership in the NEBB, he is on the Sound and Vibration committee and has taught the NEBB
sound and vibration certification courses. He has also, given practical noise lectures to architectural
and mechanical engineering student groups at local universities.
Test Engineer — for EDI's Simulated Environments testing lab. Mr. McGregor both supervises and runs
various vibration (sine, random and mixed mode), temperature, humidity, acceleration, sand / dust
and other tests. Mr. McGregor is responsible for all aspects of the test lab ranging from quoting
costs, performing tests, to writing test reports and interfacing with clients.
Previous experience includes: Prior to coming to EDI Mr. McGregor's engineering experience included; Engineering
Specialist at McDonnell Douglas Aircraft, Long Beach, CA, with responsibilities that included acoustical
modeling, diagnosis of noise and vibration sources, and implementation of design solutions for military and
commercial aircraft (1985-88). Engineer, Logicon, Inc., San Pedro, CA, with primary responsibilities including
analysis of strategic weapon system effectiveness (1984-85). Engineer, Survivability/Vulnerability Group,
Rockwell International, Lakewood, CA, with primary responsibilities to perform survivability analysis on the B-
1 B bomber (1982-84).
PROFESSIONAL Acoustical Society of America (ASA)
AFFILIATIONS: Institute of Noise Control Engineering (INCE)
American Society of Heating, Refrigerating, and
Air Conditioning Engineers (ASHRAE)
American Industrial Hygiene Association (AIHA)
National Environmental Balancing Bureau (NEBB)
EDUCATION: B.S., Physics, Colorado State University, 1980
PROFESSIONAL REGISTRATION: Professional Engineer in the State of Colorado
NEBB Certified, Sound and Vibration
3925 S. Kalamath St., Englewood, Colorado 80110 • Voice: 303-761-4367 • www.engdynamics.com
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Environmental Noise Experience
Airport/Aircraft Noise
Denver International Airport, Denver, Colorado
Noise Impact - Montbello: As part of the lengthy planning process for the new Airport, EDI was retained by private land
developers to conduct noise surveys in the Montbello residential area and to address the potential noise impact.
Centennial Airport, Littleton, Colorado
EDI completed the noise impact portion of the Federal Aviation Administration's (FAA) Environmental Impact
Assessment for the proposed extension of Runway 10/28 or addition of Runway 10/29. Noise measurements were
taken at ten sites, including homes, schools, and parks within a 5 -mile radius of the airport. The noise data collected
included aircraft type, altitude, direction and flight conditions. Flight track data was obtained during five days of
observation and recording of aircraft operations from the tower cab. IFR flight strips were analyzed to obtain flight mix
data. Flight track data, fleet mix, and traffic forecasts were input to INM Version 4.0 (which includes altitude corrections)
to prepare three airport alternatives for the Years 1990, 1995 and 2010. Arapahoe County Public Airport Authority
Developments Included: Vintage II Development, Cherry Creek Vista Subdivision, Dove Valley Business Air Park:
Stonegate Residential Area
Colorado Springs Municipal Airport
EDI prepared a Noise Impact Completeness Review for the Draft and Final Environmental Impact Statements (DEIS
& FEIS) of the Proposed Construction and Operation of Runway 17L/35R, Airport Terminal and Ancillary Facilities.
Considerations addressed included the use of appropriate descriptors of the noise environment; time -of -day and
seasonal impacts; methods of computer modeling and noise monitoring; effects of aircraft maintenance operations and
use by military aircraft (i.e., Peterson AFB, Fort Carson, NORAD, USAFA); commercial airline training operations; air
cargo operations; and approach procedures. Expert witness testimony was also presented at public hearings held by
the FAA.
Buckley Air National Guard Base, Aurora, Colorado
Noise measurements and studies were conducted for land developers to determine the suitability of adjacent property
for residential usage. Meetings were held with the Base Commander and with staff from the U.S. Air Force Environ-
mental Group (1987). (EDI withdrew from the project because it was apparent that the intent of the land developers
was to shut down Buckley ANG and exploit the adjacent land by using political methods unacceptable to EDI.
Pitkin County/Sardv Field, Aspen, Colorado
EDI was retained to measure aircraft noise levels in the airport influence area and to determine the extent of the noise
impact upon a proposed commercial development, the Airport Business Center. Measurements were taken over a 5 -
day period and an air quality and noise impact assessment report was prepared, along with visual graphics, for
presentation to the Pitkin County Commissioners. Results of the study showed that the greatest noise impact was
upon the Woody Creek area, and that the impact was entirely due to the noise from jets and turboprops. The Airport
Business Center was approved by the Commission and was constructed.
Gallatin Field - Bozeman, Montana
Noise contours were developed for an extension of the existing runway using INM Version 2.0. A noise impact report
was prepared and testimony was given at public hearings.
Minot International Airport - Minot, North Dakota
Noise contours were developed for an improved runway and the contours were included in a short noise impact
assessment report.
3925 S. Kalamath St., Englewood, Colorado 80110 • Voice: 303-761-4367 • www.engdynamics.com
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Community/Traffic Planning
Noise Survey/Study - Lake Tahoe, Nevada
EDI performed a comprehensive noise monitoring survey of the entire Lake Tahoe region for the Tahoe Regional
Planning Agency (TRPA). Representative industrial, commercial, residential and recreational sites -- 47 in all -- were
monitored over a 24 -hour period. Existing ambient noise levels were also measured along major traffic corridors. This
baseline data was used to create a computer model of noise levels and traffic flow throughout the region (5 counties
in 2 states). EDI evaluated Community Noise Equivalent Levels (CNELs) for residential, commercial, urban and rural
outdoor recreation areas (the Tahoe basin includes 20 ski resorts), and wilderness/roadless areas (the Desolation
Wilderness was used by some 100,000 hikers and campers in 1990).
Data obtained allowed TRPA to determine appropriateness of existing noise criteria, whether noise levels were
consistent with intended land use, and the probable future impact of noise. EDI presented its analysis of this technical
data in meetings with TRPA officials and various citizen's groups. EDI received a letter from W. F. Cronk, TRPA
Chairman, praising our Evaluation Report for "its completeness and its candor" since "It not only covers the progress
and problems of the last several years, but also sets policy directions for the future." Client: TRPA
Natchez Trace
EDI performed a traffic noise assessment from proposed alternatives to existing roadway through the Natchez Trace
Historical Parkway, Mississippi. Client: BRW
I-70/1-76/Wadsworth Blvd Interchange - Denver, Colorado
EDI took measurements at eight nearby residences, compared the results with U.S. Department of Housing and Urban
Development (HUD) and Colorado Department of Transportation (CDOT) noise standards, developed a computer
model using STAMINA 2.0, and evaluated the relative cost and effectiveness of noise barriers on a steeply sloped site.
CDOT Proj. l(CX)076-1(151); Client: Turner Collie & Braden
City of Pueblo, Colorado - Department of Transportation
EDI provided 24 -hour noise measurements for a proposed Transit Plaza and Bus Transfer Facility to be located in
downtown Pueblo. Results were analyzed relative to the criteria of Federal Transportation Authority Circular UMTA
C5620.1 for environmental assessment of urban mass transit projects. It was determined that the noise impact of
constructing the Facility and projected traffic increases would range from "Insignificant" to "Possibly Significant" at
surrounding buildings. Noise mitigation measures were suggested. EDI also performed a study of vibration caused
by bus traffic.
City of Aurora, Colorado - Public Works Department:
Buckley, Sable and Laredo Streets Extension: EDI conducted an acoustical impact study for extension of Buckley
Road from Colfax Avenue to Smith Road. Existing traffic levels and mix, noise sources and levels were established.
Expected traffic volume increase was calculated through the Year 2010, accounting for the opening of Denver
International Airport and associated development and construction. An Leq-65 dB(A) contour was determined showing
an impact area 100 to 150 feet from the centerline of Buckley Road.
City of Colorado Springs, Colorado - Street Division
EDI provided analysis of noise impact of a Satellite Facility at Woodman Road and Rockrimmon on nearby apartments
and retail centers. The use of a front end loader was of special concern; it was determined the loader would be audible
at residences about 50% of the time. Appropriate noise barriers were prescribed.
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Energy/Mining Operations
Aspen Gun Club, Aspen, Colorado
EDI measured gunfire noise at the Executive Security International training range, adjacent to the White Star Ranches
Subdivision. Noise levels were found to exceed the limits set by Colorado Revised Statutes, Title 25-12-103, which
includes a 5 dB penalty for "impulsive" noise. EDI reviewed plans for a noise control structure and found that the initial
plan would not provide sufficient noise reduction.
Cooley Gravel - 88th and Dahlia Pit, Golden, Colorado
Cooley Gravel had applied for a conditional permit for 24 -hour operations during the Summer of 1993. EDI measured
noise levels from equipment scheduled for operation in the Pit, calculated estimated noise levels at nearby residences
and specified berm heights to achieve the State of Colorado 50 dB(A) nighttime noise limit at these residences. EDI
presented the analysis results before the Commerce City Commissioners and 24 -hour operations permit was granted.
EDI followed up with random noise monitoring to demonstrate compliance with the nighttime noise limit and presented
these results before the Commissioners.
Centennial Materials, Franktown, Colorado
EDI performed noise measurements at the McClain Pit near Franktown, Colorado to demonstrate that noise from Pit
operations did not exceed that State of Colorado 55 dB(A) noise limit at the property boundary.
Cooley Gravel Company - Morrison Quarry, Morrison, Colorado
This large quarry operates in mountainous terrain within visual range of southwestern suburban Denver. Haul truck
routes skirt the Willowbrook subdivision. Following extensive negotiations, in 1991 Cooley was granted a permit for
24 -hour operations. EDI first took measurements to establish the maximum noise level on the haul road which would
still produce acceptable levels when transmitted to nearby homes. Then, to verify continuous compliance with State
of Colorado limits for "impulsive" nighttime noise in a Residential zone (the most restrictive standard), EDI designed
and fabricated a custom noise/wind speed monitor. Trucks which exceed the set noise limit set off an automatic alarm
and are also "captured" on video camera. EDI took post -installation measurements to confirm the monitor's perfor-
mance. EDI also prepared driving and road maintenance guidelines. Truckers now compete for the quietest recorded
runs. EDI also provided noise control for Cooley Asphalt Batch Plants in Thornton and Sedalia, CO.
Sheep Mountain Quarry - Jefferson County, Colorado
EDI is providing noise impact assessment for this proposed rock quarry to be located east of Golden, CO. Various
operating plans have been considered. Work to date has included: Analysis of noise emissions from mining
equipment; design of noise control systems; analysis of haul truck noise along U.S. 6 and State Highway 58, using
STAMINA; calibration of noise model with actual traffic measurements along the haul route corridor; determination of
particulate generation associated with quarry operations and design of emission control methods; analysis of haul truck
emissions on air quality along haul routes; and extensive testimony at public hearings and before the County
Commission.
3925 S. Kalamath St., Englewood, Colorado 80110 • Voice: 303-761-4367 • www.engdynamics.com
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Page 17 of 18
ARTILLERY, GUN CLUBS AND FIRING RANGES
Colorado Department of Military Affairs
Environmental impact assessment for proposed Colorado National Guard Limon, Colorado training site. The
proposed facility was to include a live fire area and tracked and wheeled vehicle maneuver areas.
Thunder Valley Shooting Range and Sports Cycle Facility
Noise impact assessment of proposed law enforcement shooting range, sport cycle, multi -use facility located in
Jefferson County. EDI recommended noise mitigation designs.
Military Shooting and Vehicle Training Range
EDI is acting as the prime Professional of an Environmental Assessment for a proposed Military Training Facility.
Activities that will occur at the Facility are handgun and rifle (including fully automatic weapon) gun training and
certification and some artillery firing. Details of the project are to remain confidential until completion.
Colorado Springs, Colorado - Police Firing Range
EDI provided noise impact assessment of Range activities and mitigation designs recommendations to minimize noise
on nearby residences and Community College. Client: GMS, Inc.
Golden Gun Club, Golden, Colorado
EDI performed noise measurements at nearby residences during various shooting activities; large and small bore
handgun and rifle competition and trap competition. This data was used to provide construction design
recommendations for reducing gunfire noise at nearby residences. EDI's recommendations were incorporated into
presentation given the County Commissioners. Client: Golden Gun Club
Cherry Creek Reservoir Range, Aurora, Colorado
EDI measured gunfire noise levels produced from three different caliber rifles at the range property line. The caliber
of rifles measured were 0.338, 0.416 and 0.454; no data on the projectile weights and load size was recorded. Results
of the measurements were presented to the County commissioners for Owner to get approval to provide a facility for
hunters to sight -in rifles. Client: Alan Duckworth 300 Gunsmith.
Aspen Gun Club, Aspen, Colorado
EDI measured gunfire noise at the Executive Security International training range, adjacent to the White Star Ranches
Subdivision. Noise levels were found to exceed the limits set by Colorado Revised Statutes, Title 25-12-103, which
includes a 5 dB penalty for "impulsive" noise. EDI reviewed plans for a noise control structure and found that the initial
plan would not provide sufficient noise reduction.
Cherry Creek Gun Club, Arapahoe County, Colorado
EDI measured firearm noise at nine sites on the Club property line, located on Clinton Street in Arapahoe County, CO.
EDI designed underground ranges for handguns and large bore firearms, noise control for an observation room, and
air purge intake and exhaust mufflers.
3925 S. Kalamath St., Englewood, Colorado 80110 • Voice: 303-761-4367 • www.engdynamics.com
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Asphalt Specialties — ASCI
24 May 2017
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National Parks And Ski Areas
Breckenridge Ski Area — environmental noise impact assessment for Peak 7 and Peak 9 expansions.
Yosemite National Park Noise assessment for various roadway traffic use patterns. Assessment primarily addressed
traffic use patterns and re-routing of traffic to limit vehicle access to Yosemite Valley. Noise levels of diesel and electric
buses were measured to determine the level of noise reduction from replacing diesel buses with electric buses. Client:
BRW
Yellowstone and Grand Teton National Parks, Wyoming
An environmental noise impact assessment was performed to evaluate existing and proposed alternatives for winter
recreational vehicle use. The primary impact was from snowmobile use. The alternatives examined ranged from tighter
noise emission restrictions to the elimination of snowmobile use. Client: BRW
Breckenridge Ski Area, Breckenridge, Colorado
EDI performed an environmental noise assessment for the proposed expansion of Peaks 7 and 8. This assessment
included background noise measurements at various residential locations and noise emission properties of several
snow making devices, while in operation. The noise impact of the proposed expansion was modeled at various
locations and noise contours were generated. This assessment was submitted in a formal report to the U.S. Forest
Service for inclusion in the Departments Official Environmental Impact Report.
Aspen Highland Gondola, Aspen, Colorado
EDI conducted a Noise Impact Assessment for a proposed gondola. Client: Aspen Ski Company
Buttermilk Ski Area, Aspen, Colorado
EDI performed a noise study and preliminary environmental consulting for the ski area's 1998 master plan proposed
conditions. Client: Maroon Creek Ranch
3925 S. Kalamath St., Englewood, Colorado 80110 • Voice: 303-761-4367 • www.engdynamics.com
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