April 30, 2018

Ms. Danica Lee, Director
Denver Department of Environmental Health
Public Health Inspections Division
200 W. 14th Avenue, Suite 200
Denver, CO 80204

Request for Variance to Noise Ordinance
Central 70, I-70 from I-25 to Chambers Rd.
Dear Ms. Lee:
Kiewit Infrastructure Co. (KIC) hereby requests a variance to the City and County of Denver
(CCD) Noise Ordinance DRMC, Chapter 36, Section 36-7(5) to be granted for the above
referenced project, which is scheduled to begin by summer 2018. A check of $25.00 payable to
the Manager of Finance is enclosed to process this variance request. The reasons for needing the
variance are outlined below.
The Central 70 Project will reconstruct a 10-mile stretch of I-70 between I-25 and Chambers
Road, add one new Express Lane in each direction, remove the aging 54-year old viaduct, lower
the interstate between Brighton and Colorado Boulevards, and place a 4-acre park over a portion
of the lowered interstate.
When completed, it will reduce congestion, improve safety, and better accommodate future
growth along this vital transportation corridor. The work of this project will facilitate greater
access to the areas adjacent to the project for business and residents alike. Thus, while the work
will have a short-term effect on those residents and businesses located adjacent to the project, the
long-term effects of the project will positively enhance the area as a whole.

 Ms. Danica Lee
April 30, 2018
Page 2

Type and Timing of Claim
The timing of the request for variance, if granted, will allow contractors to begin night work at
the start of construction and plan this into their schedules and bids. Nighttime construction on the
Central 70 Project is slated to begin in summer 2018 (immediately after the granted variance)
and last 5 years until winter 2023. I-70 is a major east-west transportation corridor in the Denver
Metropolitan area that experiences heavy traffic loads under normal circumstances. It is home to
1,200 businesses, provides regional connections to Denver International Airport, and carries
upwards of 200,000 vehicles per day. Night work will be required (working 24 hours per day)
primarily to reduce the overall project duration and minimize inconvenience to the local
businesses, residents, and traveling public, and to maximize safety of workers and the traveling
public. Work will be performed 24 hours a day when required. Furthermore, for major
equipment and material deliveries, additional traffic impacts will be required, which could also
be performed at night with a noise variance.
The project extends along Interstate 70 approximately from Interstate-25 on the west end to
Chambers Road on the east end.
We have broken down the work into three areas. An overview of the project extent and work
areas is shown in Figure 1.

Project Work Area Locations:
West: between I-25 and Colorado Boulevard
Central: between Colorado Boulevard and Quebec (Sand Creek Bridge)
East: between Quebec (Sand Creek Bridge) and Chambers Road
This application focuses on the impact of nighttime construction noise on adjacent properties.
Residential areas are concentrated in the West area between I-25 and Colorado Boulevard. There
are also residences east of Colorado Boulevard and north of I-70 between Peoria Street and
Chambers Road that were taken into account.
The nighttime construction noise limits also apply to commercial properties. We are evaluating
the nighttime noise impact on hotels in the vicinity of I-70 from I-25 to Chambers Road, as well
as a fire station on Brighton Boulevard. We have not identified any other noise or vibration
sensitive commercial properties such as hospitals, medical clinics, laboratories.

 Ms. Danica Lee
April 30, 2018
Page 3

West

Central

East

Figure 1: Project Overview Map
The following work is proposed for nighttime hours:
1. MOT Lane Closures - Corridor Wide
2. MOT Concrete Barrier Set/Remove - Corridor Wide
3. MOT Temp Paving Detours – Corridor Wide
4. Asphalt Paving – Corridor Wide
5. Excavation/Embankment – Corridor Wide
6. MSE Walls – Center Section (Colorado to Quebec)
7. Surface Removals – Corridor Wide
8. Drilled Shafts – Corridor Wide
9. CIP Walls – Corridor Wide
10. Drainage/Utility Tie Ins – Corridor Wide
11. Bridge Work – Girder Set
12. Bridge Work – Deck Pour
13. Bridge Work – Form/Pour/Strip
14. Bridge Demolition
This variance request will focus on the construction between I-25 and Colorado Boulevard
(approximately three miles long) because that is where the majority of residential areas are
located.
Date of Payment:
A check was presented to CCD on April 30, 2018, with this application.

 Ms. Danica Lee
April 30, 2018
Page 4

Objections to Manager’s Determinations:
The Manager has not made a determination at this time.
Hardship if Variance is Not Granted:
•
•

•

•
•

There will be substantially more people traveling through work areas during the day. It is
safer for local residents, businesses, and the public to perform the proposed work at night.
Due to the nature of the work involved, some bridge work must take place on or over I70. For example, demolishing the bridges, building parts of the substructure, and building
the superstructure. CDOT will not allow closures of I-70 during daytime hours and
nighttime closures will be limited.
Working at night will decrease the duration of the construction. If the nighttime work is
eliminated or reduced, the work duration would be prolonged significantly which would
extend the time that local residents, businesses, and the general public would be affected
by the work.
The nighttime work should reduce overall daytime traffic congestion and make it easier
for local residents to perform everyday tasks, such as going to the grocery store, gym, or
dropping their kids off at school.
The financial impacts could be substantial for nearby businesses if the work is performed
during the day. The increased daytime traffic and lane closures/changes would make
access to local businesses much more difficult.

No Adverse Effects to Public Health:
To ensure minimal impacts on the community during the course of construction, KIC will plan
its work schedule to quickly and efficiently perform work in areas adjacent to local businesses
and residents. KIC hopes to complete the project work prior to the estimated 2023 completion
date. KIC will monitor noise levels over the course of the project when needed and will mitigate
noise levels where feasible. Furthermore, from a public relations and public information
perspective, KIC will continue to engage in public outreach and information efforts aimed at
reaching out to the community and keeping them up-to-date regarding the progress of the project
work. Thus far, KIC holds monthly business and developer outreach meetings during
preconstruction and positive relationships are being forged, which KIC will continue to
strengthen throughout the entire project. As part of its public information plan, KIC will provide
schedules regarding major project related events including the start of construction, major traffic
switches, intersection closures, and pedestrian access, through social media, email, and a
website. KIC will make available a public information website and telephone number for local
residents to call and voice their project related concerns.
A preliminary noise analysis has been performed by Wave Engineering, Inc., to identify
locations (and distances from the work) where noise level exceedances are likely to occur. The
results of this study are outlined below.

 Ms. Danica Lee
April 30, 2018
Page 5

Denver Noise Ordinance
The Denver Noise Ordinance Chapter 36 limits noise levels to 55 dBA during the day and to 50
dBA at night at a residential property line. Construction noise is allowed to exceed the daytime
limit. If construction noise levels will exceed the nighttime limit, then a variance is required. On
previous projects for which a nighttime noise variance was granted by the City and County of
Denver, construction noise levels have been limited to an LEQ of 75 dBA and an LMAX of 86
dBA.

Construction Noise Level Predictions
Wave Engineering, Inc., used the Roadway Construction Noise Model (RCNM) developed by
the Federal Highway Administration (FHA) to predict noise levels from nighttime construction
activity.
There are many homes along the West work area. The nighttime construction noise levels at
these homes will vary based on the type of work (see Figure 1 map) and the distance from the
work.
Corridor Wide
Many of the construction operations will occur across the entire West work area. We will refer to
these as “Corridor wide” operations. The noise levels for corridor wide work will be constantly
shifting, consistent along the work route, and noise levels will be a function of distance from the
edge of the lane of travel under construction.
Bridge Work
The nighttime construction for bridge work will occur in specific areas around each bridge. The
work will be more stationary and noise levels will be a function of distance from the construction
activity to the residences.
Predicting construction noise levels at each residence would be very difficult because the exact
location of the construction activity will move around on a nightly basis, and the noise making
equipment will move around each work area. Instead of predicting noise levels at every
residence along the corridor or near each bridge, we determined the distances from each type of
work where the LMAX and LEQ criteria may be exceeded and determined how many homes fall
within this distance and may require additional mitigation or controls.
The following source levels for significant noise producing equipment were used in our analysis.
The RCNM database of equipment noise levels and usage percentage were used.

 Ms. Danica Lee
April 30, 2018
Page 6

Table 1: Source Sound Levels
Construction Equipment

Auger Drill Rig
Concrete Mixer Truck
Concrete Pump Truck
Concrete Saw
Compressor
Crane
Dozer
Dump Truck
Excavator
Flat Bed Truck
Front End Loader/Skid Steer
Generator/Light Plant
Grader
Man Lift
Mounted Impact Hammer
Paver
Pickup Truck
Pumps
Roller
Shears
Welder/Torch

LMAX at
50′
(dBA)
84
79
81
90
78
81
82
77
81
74
79
76
85
75
90
77
75
81
80
96
74

*The Generator/Light Plant units that are going to be used during construction are the Allmand
Night-Lite Pro 2. The LMAX (at 50′) of these units was measured at 76 dBA. This is quieter than
the 81 dBA that is used in the RCNM database.
The noise level at each individual residence will depend on which equipment is operating, the
distance of the equipment from the residence, and whether or not the residence is shielded from
the equipment by other buildings, sound walls, etc. Due to the close proximity of most of the first
row receiver buildings to the construction, we have not included shielding of the equipment from
the buildings. There will often be shielding of second, third, etc., row homes, but it will vary on a
home-by-home basis. Additionally, as the road work descends below grade (in specific sections),
the receivers will receive shielding from the ground that is above the road. We have not
accounted for shielding in order to provide worst case estimates.
The LEQ values shown below were calculated with the RCNM program using the LMAX values at
50′ for equipment that is operating simultaneously and their associated usage. The LEQ is the
equivalent noise level which is similar to an average noise level over a one hour period. We

 Ms. Danica Lee
April 30, 2018
Page 7

assumed that the equipment will be spread out around a typical work site. The LMAX noise levels
are calculated from the loudest piece of equipment.
The LEQ calculations take into account the distance from the equipment and the usage factor of
each piece of equipment. The usage factor is the percentage of time during a typical work hour
when the equipment is operating at full power.
The LMAX values shown below were calculated using the LMAX values at 50′. The LMAX is the
maximum noise level at each receiver location from the loudest piece of equipment. The LMAX
calculations take into account the distance from the equipment to the receivers. The usage factor
is not used in the LMAX calculation as it is assumed that the loudest piece of equipment is at full
power.

Corridor Wide Construction
The corridor wide construction will take place along on both sides of the roadway between
Colorado Boulevard and I-25. We used the RCNM to determine the distances from each
construction operation where the LEQ noise level is equal to 75 dBA and where the LMAX is equal
to 86 dBA. These distances began at the construction area, generally near the curb or edge of the
road. The distances were determined for both the existing location of the road and the future
placement of the road. Beyond these distances, the LEQ and LMAX are less than 75 dBA and 86
dBA, respectively. To ensure the LMAX would be a worst-case scenario, in the calculations, the
two loudest pieces of equipment were placed next to each other at the edge of the construction
areas. Furthermore, the second, third, etc., row of homes will receive some screening from closer
rows of homes or commercial buildings, so the actual noise levels should be lower (to be
conservative, the change in the noise level from building screening was not used in the
calculations).
Below is a description of the corridor wide nighttime operations, the equipment that will be used
during the operations, the distances for the LEQ and LMAX noise levels, and the number of homes
that are within these distances. Keep in mind that all of the homes will not be affected on any
given night, but the total number of homes that will be affected during the project from each type
of nighttime construction operation is given. An example of the typical extent of construction
noise is given in Figure 2. The shaded area in Figure 2 shows the extent of the area where the
nighttime noise limits may be exceeded and mitigation measures would be implemented. Figure
2 shows the loudest corridor wide activity which is from the Excavation and Embankment work
(as well as the Surface Removal work).

 Ms. Danica Lee
April 30, 2018
Page 8

Interstate 25

Areas Above LEQ
and/or LMax Limits

Brighton Blvd.

Steele St.

Figure 2: Construction Noise Extent for Excavation and Embankment Work

 Ms. Danica Lee
April 30, 2018
Page 9
Maintenance of Traffic (MOT) Lane Closures - Corridor Wide
During this operation, pickup/flatbed trucks will operate along I-70 and associated frontage roads
within the project limits to open/close specific lanes, which will be used to help control traffic
during other phases of construction. This will take place and affect houses along the entire
project area.
The equipment that will be used during this operation is listed in Table 2.
Table 2: Lane Closure Equipment
Equipment Description
Pickup Truck
Flat Bed Truck

Quantity
2
4

LEQ = 75 dBA at 75′ from I-70
LMAX = 86 dBA at 15′ from I-70
Approximately 27 Denver homes along the corridor potentially fall within the 75 dBA LEQ
(within 75′ distance)
Approximately 3 Denver homes along the corridor potentially fall within the 86 dBA LMax
(within 15′ distance)
MOT Concrete Barrier Set/Remove - Corridor Wide
During this operation, pickup/flatbed trucks, an excavator, front end loaders, and generators will
operate along I-70 and associated frontage roads within the project limits to set up and/or remove
concrete barriers, which will be used to help control traffic during other phases of construction.
This will take place and affect houses along the entire project area.
The equipment that will be used during this operation is listed in Table 3.
Table 3: Concrete Barrier Set/Remove equipment
Equipment Description
Pickup Truck
Excavator
Front End Loader
Flat Bed Truck
Generator (Light Plant)

Quantity
2
1
2
6
4

LEQ = 75 dBA at 175′ from I-70
LMAX = 86 dBA at 40′ from I-70
Approximately 126 Denver homes along the corridor potentially fall within the 75 dBA LEQ
(within 175′ distance)
Approximately 29 Denver homes along the corridor potentially fall within the 86 dBA LMax
(within 40′ distance)

 Ms. Danica Lee
April 30, 2018
Page 10
MOT Temp Paving Detours – Corridor Wide
During this operation, pickup/dump trucks, a paver, a front end loader, rollers, and generators
will operate along I-70 and associated frontage roads within the project limits to set up detours,
which will be used to help redirect traffic during other phases of construction. This will take
place and affect houses along the entire project area.
The equipment that will be used during this operation is listed in Table 4.
Table 4: MOT Temp Paving Detours equipment
Equipment Description
Pickup Truck
Paver
Dump Truck
Front End Loader
Roller
Generator (Light Plant)

Quantity
2
1
9
1
3
2

LEQ = 75 dBA at 175′ from I-70
LMAX = 86 dBA at 40′ from I-70
Approximately 126 Denver homes along the corridor potentially fall within the 75 dBA LEQ
(within 175′ distance)
Approximately 29 Denver homes along the corridor potentially fall within the 86 dBA LMax
(within 40′ distance)
Asphalt Paving – Corridor Wide
During this operation, pickup/dump trucks, a paver, a front end loader, rollers, and generators
will operate along I-70 and associated frontage roads within the project limits to lay asphalt for
the new and existing roads. This will take place and affect houses along the entire project area.
The equipment that will be used during this operation is listed in Table 5.
Table 5: Asphalt Paving equipment
Equipment Description
Pickup Truck
Paver
Dump Truck
Front End Loader
Roller
Generator (Light Plant)

Quantity
2
1
9
1
4
2

 Ms. Danica Lee
April 30, 2018
Page 11

LEQ = 75 dBA at 175′ from I-70
LMAX = 86 dBA at 40′ from I-70
Approximately 126 Denver homes along the corridor potentially fall within the 75 dBA LEQ
(within 175′ distance)
Approximately 29 Denver homes along the corridor potentially fall within the 86 dBA LMax
(within 40′ distance)
Excavation/Embankment – Corridor Wide
During this operation, pickup/dump/flatbed trucks, an excavator, dozers, a roller, a grader, and
generators will operate along I-70 and associated frontage roads within the project limits to
create and/or remove embankments and excavations, which will be used in the creation of the
new road way. This will take place and affect houses along the entire project area.
The equipment that will be used during this operation is listed in Table 6.
Table 6: Excavation/Embankment equipment
Equipment Description
Pickup Truck
Excavator
Dozer
Roller
Grader
Dump Truck
Generator (Light Plant)
Flat Bed Truck

Quantity
2
1
2
1
1
10
10
1

LEQ = 75 dBA at 290′ from I-70
LMAX = 86 dBA at 60′ from I-70
Approximately 274 Denver homes along the corridor potentially fall within the 75 dBA LEQ
(within 290′ distance)
Approximately 50 Denver homes along the corridor potentially fall within the 86 dBA LMax
(within 60′ distance)
Mechanically Stabilized Earth (MSE) Walls – Center Section (Colorado to Quebec)
During this operation, pickup/dump/flatbed trucks, a compressor, a dozer, an excavator, a front
end loader, a generator, a man lift, and a roller will operate along I-70 and associated frontage
roads within the project limits to build MSE walls. This will take place between Colorado
Boulevard and Quebec Street. The closest houses during this construction will not be affected by
the construction noise.
The equipment that will be used during this operation is listed in Table 7.

 Ms. Danica Lee
April 30, 2018
Page 12

Table 7: MSE Walls equipment
Equipment Description
Pickup Truck
Compressor
Dozer
Dump Truck
Excavator
Front End Loader
Generator (Light Plant)
Flat Bed Truck
Man Lift
Roller

Quantity
2
1
1
4
1
1
1
1
1
1

No residences are located within the vicinity of this operation.
Surface Removals – Corridor Wide
During this operation, pickup/dump/flatbed trucks, excavators, mounted impact hammers, a front
end loader, generators, and a concrete saw will operate along I-70 and associated frontage roads
within the project limits to remove the existing pavement in certain locations. This will take
place and affect houses along the entire project area.
The equipment that will be used during this operation is listed in Table 8.
Table 8: Surface Removals equipment
Equipment Description
Pickup Truck
Excavator
Mounted Impact Hammer
Front End Loader
Dump Truck
Generator (Light Plant)
Flat Bed Truck
Concrete Saw

Quantity
2
2
2
1
2
4
1
1

LEQ = 75 dBA at 290′ from I-70
LMAX = 86 dBA at 120′ from I-70
Approximately 274 Denver homes along the corridor potentially fall within the 75 dBA LEQ
(within 290′ distance).
Approximately 112 Denver homes along the corridor potentially fall within the 86 dBA LMax
(within 120′ distance)

 Ms. Danica Lee
April 30, 2018
Page 13
Drilled Shafts – Corridor Wide
During this operation, pickup trucks, an auger drill rig, a front end loader, generators, a concrete
mixer truck, a crane, and pumps will operate along I-70 and associated frontage roads within the
project limits to create drilled shaft supports for the roadway/bridges. This will take place and
affect houses along the entire project area.
The equipment that will be used during this operation is listed in Table 9.
Table 9: Drilled Shafts equipment
Equipment Description
Pickup Truck
Auger Drill Rig
Front End Loader
Generator (Light Plant)
Concrete Mixer Truck
Crane
Pumps

Quantity
2
1
1
4
1
1
1

LEQ = 75 dBA at 195′ from C-70
LMAX = 86 dBA at 50′ from C-70
Approximately 141 Denver homes along the corridor potentially fall within the 75 dBA LEQ
(within 195′ distance)
Approximately 38 Denver homes along the corridor potentially fall within the 86 dBA LMax
(within 50′ distance)
CIP Walls – Corridor Wide
During this operation, pickup trucks, a front end loader, a compressor, generators, an excavator,
a man lift, concrete mixer trucks, and a concrete pump truck will operate along I-70 and
associated frontage roads within the project limits to create cast-in-place walls. This will take
place and affect houses along the entire project area.
The equipment that will be used during this operation is listed in Table 10.

 Ms. Danica Lee
April 30, 2018
Page 14

Table 10: CIP Walls equipment
Equipment Description
Pickup Truck
Front End Loader
Compressor (Air)
Generator (Light Plant)
Excavator
Man Lift
Concrete Mixer Truck
Concrete Pump Truck

Quantity
2
1
1
4
1
1
4
1

LEQ = 75 dBA at 195′ from I-70
LMAX = 86 dBA at 40′ from I-70
Approximately 141 Denver homes along the corridor potentially fall within the 75 dBA LEQ
(within 195′ distance)
Approximately 29 Denver homes along the corridor potentially fall within the 86 dBA LMax
(within 40′ distance)
Drainage/Utility Tie Ins – Corridor Wide
During this operation, pickup/flatbed trucks, a front end loader, an excavator, a roller, generators,
and pumps will operate along I-70 and associated frontage roads within the project limits to
move, connect, replace, etc., the drainage pipes and utilities. This will take place and affect
houses along the entire project area.
The equipment that will be used during this operation is listed in Table 11.
Table 11: Drainage/Utility Tie Ins equipment
Equipment Description
Pickup Truck
Front End Loader
Excavator
Roller
Flat Bed Truck
Generator (Light Plant)
Pumps

Quantity
2
1
2
1
1
4
1

LEQ = 75 dBA at 195′ from I-70
LMAX = 86 dBA at 40′ from I-70
Approximately 141 Denver homes along the corridor potentially fall within the 75 dBA LEQ
(within 195′ distance)
Approximately 29 Denver homes along the corridor potentially fall within the 86 dBA LMax
(within 40′ distance)

 Ms. Danica Lee
April 30, 2018
Page 15

Bridge Construction
The bridge construction will take place at multiple bridges along I-70 and will occur on both
sides of I-70. Similar to the corridor wide calculations, we used the RCNM to determine the
distances from each bridge construction operation to where the LEQ noise level is equal to 75
dBA and where the LMAX is equal to 86 dBA. The distances were taken from both the edge of the
construction areas and the center of the construction areas. To ensure the LMAX would be a worstcase scenario, in the calculations, the two loudest pieces of equipment were placed next to each
other at the edge of the construction areas. The construction areas were determined by finding
the bridge construction locations with the highest density of nearby residences. Beyond these
distances, the LEQ and LMAX are less than 75 dBA and 86 dBA, respectively. Again, these
distances are a worst-case scenario. Furthermore, the second, third, etc., row of homes will
receive some screening from the previous row of homes or commercial buildings, so the actual
noise levels should be lower (to be conservative, the change in the noise level from building
screening was not used in the calculations).
Below is a description of the bridge nighttime construction and demolition, the equipment that
will be used during the construction, the distances for the LEQ and LMAX noise levels and the
number of homes within these distances. The LEQ distance/radius is shown in Figure 3.
Bridge Work – Girder Set
During this operation, pickup/flatbed trucks, cranes, generators, man lifts, and a front end loader
will operate at a bridge to set up girders for the bridge construction. The bridge locations are at
Brighton Boulevard, UPRR, York Street, Josephine Street, Columbine Street, Clayton Street,
Fillmore Street, Steele Street, Cook Street, Monroe Street, BNSF, and Colorado Boulevard
The equipment that will be used during this operation is listed in Table 12.
Table 12: Bridge Work - Girder Set equipment
Equipment Description
Pickup Truck
Crane
Flat Bed Truck
Generator (Light Plant)
Man Lift
Front End Loader

Quantity
4
2
6
10
2
1

LEQ = 75 dBA at 200′ from edge of equipment (260′ radius from center of equipment)
LMAX = 86 dBA at 40′ from edge of equipment (100′ radius from center of equipment)
Approximately 171 Denver homes (total for all bridges combined) fall within the 75 dBA LEQ
(within 200′ distance)
Approximately 72 Denver homes (total for all bridges combined) fall within the 86 dBA LMAX
(within 40′ distance)

 Ms. Danica Lee
April 30, 2018
Page 16

Brighton Blvd.

Areas Above LEQ
and/or LMax Limits

Steele St.

Colorado Blvd.
Figure 3: Girder Set Noise LEQ Distance/Radius

 Ms. Danica Lee
April 30, 2018
Page 17
Bridge Work – Deck Pour
During this operation, Pickup trucks, Concrete Pump Trucks, Concrete Mixer Trucks, a
compressor, a man lift, and generators will operate at a bridge to pour the bridge deck. The
bridge locations are Brighton Boulevard, UPRR, York Street, Josephine Street, Columbine
Street, Clayton Street, Fillmore Street, Steele Street, Cook Street, Monroe Street, BNSF, and
Colorado Boulevard
The equipment that will be used during this operation is listed in Table 13.
Table 13: Bridge Work – Deck Pour equipment
Equipment Description
Pickup Truck
Concrete Pump Truck
Concrete Mixer Truck
Compressor (Air)
Man Lift
Generator (Light Plant)

Quantity
4
2
8
1
1
11

LEQ = 75 dBA at 275′ from edge of equipment (335′ radius from center of equipment)
LMAX = 86 dBA at 40′ from edge of equipment (100′ radius from center of equipment)
Approximately 209 Denver homes fall (total for all bridges combined) within the 75 dBA LEQ
(within 275′ distance).
Approximately 72 Denver homes (total for all bridges combined) fall within the 86 dBA LMAX
(within 40′ distance)
The LEQ distance/radius is shown in Figure 4. (Please note that the LMAX limits are not shown
here as they are the same limits shown in Figure 3)

 Ms. Danica Lee
April 30, 2018
Page 18

Brighton Blvd.

Areas Above LEQ
and/or LMax Limits

Steele St.

Colorado Blvd.
Figure 4: Deck Pour Noise LEQ Distance/Radius

 Ms. Danica Lee
April 30, 2018
Page 19
Bridge Work – Form/Pour/Strip
During this operation, pickup trucks, a front end loader, a compressor, a man lift, a crane, and
generators will operate at a bridge to form, pour, and strip the bridges/road. The bridge locations
are Brighton Boulevard, UPRR, York Street, Josephine Street, Columbine Street, Clayton Street,
Fillmore Street, Steele Street, Cook Street, Monroe Street, BNSF, and Colorado Boulevard
The equipment that will be used during this operation is listed in Table 14.
Table 14: Bridge Work – Form/Pour/Strip equipment
Equipment Description
Pickup Truck
Front End Loader
Compressor (Air)
Man Lift
Crane
Generator (Light Plant)

Quantity
2
1
1
1
1
4

LEQ = 75 dBA at 160′ from edge of equipment (195′ radius from center of equipment)
LMAX = 86 dBA at 40′ from edge of equipment (75′ radius from center of equipment)
Approximately 114 Denver homes fall (total for all bridges combined) within the 75 dBA LEQ
(within 160′ distance).
Approximately 72 Denver homes (total for all bridges combined) fall within the 86 dBA LMAX
(within 40′ distance)
The LEQ distance/radius is shown in Figure 5. (Please note that the LMAX limits are not shown
here as they are the same limits shown in Figure 3)

 Ms. Danica Lee
April 30, 2018
Page 20

Brighton Blvd.

Areas Above LEQ
and/or LMax Limits

Steele St.

Colorado Blvd.
Figure 5: Form/Pour/Strip Noise LEQ Distance/Radius

 Ms. Danica Lee
April 30, 2018
Page 21
Bridge Demolition
During this operation, pickup/dump/flatbed trucks, excavators, shears, mounted impact hammers,
front end loaders, a compressor, generators, a welder/torch, and a concrete saw will operate at
existing bridges to demolish them. The bridge locations are Brighton Boulevard bridge, UPRR
Bridge, and the bridges at the I-70 viaduct.
The equipment that will be used during this operation is listed in Table 15.
Table 15: Bridge Demolition equipment
Equipment Description
Pickup Truck
Excavator
Shears (on backhoe)
Mounted Impact Hammer
Front End Loader
Dump Truck
Compressor
Generator (Light Plant)
Welder/Torch
Flat Bed Truck
Concrete Saw

Quantity
4
8
2
6
3
3
1
10
1
2
2

LEQ = 75 dBA at 700′ from edge of equipment (750′ radius from center of equipment)
LMAX = 86 dBA at 225′ from edge of equipment (275′ radius from center of equipment)
Approximately 324 Denver homes fall (total for all bridges combined) within the 75 dBA LEQ
(within 700′ distance).
Approximately 68 Denver homes (total for all bridges combined) fall within the 86 dBA LMAX
(within 225′ distance)
The LEQ distance/radius is shown in Figure 6.

 Ms. Danica Lee
April 30, 2018
Page 22

Brighton Blvd.

Areas Above LEQ
and/or LMax Limits

Fillmore St.

Figure 6: Bridge Demolition Noise LEQ Distance/Radius

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April 30, 2018
Page 23

The home counts are based on construction in the closest lanes to the homes.
Hotels
The following hotels will be affected by the MOT concrete barrier set/removal work, MOT
temporary paving detours work, and asphalt paving work:
•
•

Denver’s Best Inn & Suites – 4590 Quebec St, Denver, CO
Western Motor Inn – 4757 Vasquez Blvd. E, Denver, CO

The following hotels, as well as the hotels mentioned above, will be affected by the surface
removal work:
•
•

The Timbers Hotel – 4411 Peoria St, Denver, CO
Courtyard by Marriot Denver Stapleton – 7415 E 41st Ave, Denver, CO

The following hotels, as well as the hotels mentioned above (except for the Western Motor Inn),
will be affected by bridge demolition work:
•
•
•

Comfort Inn Denver East – 4380 Peoria St, Denver, CO
Rodeway Inn – 3975 Peoria Way, Denver, CO
Motel 6 Denver - Airport – 12020 E 39th Ave, Denver, CO

Fire Departments
The Denver Fire Department Fire Station 9 will be affected by the bridge work conducted along
Brighton Boulevard.
Maintain Harmony with the Spirit and Purpose of the Ordinance:
The daytime alternative for completing the required demolition and construction activities would
be a great hardship for the surrounding community; it would generate greater negative impacts to
the local community and highway system when compared to the short-term increase in nighttime
noise levels that are projected for the nighttime alternative. CDOT will not allow certain work to
be performed during daytime hours. In addition, certain work cannot be done safely during the
daytime hours.
The nighttime alternative effectively minimizes traffic congestion, safety hazards, and financial
impacts to nearby businesses and user costs of the traveling public.
KIC is prepared to pro-actively address nighttime construction noise concerns. KIC will retain an
acoustical engineering firm to assist with noise issues during the project. Noise levels will be
measured pro-actively and KIC will investigate any complaints that are received. KIC staff will
be trained in the use of a sound level meter to provide an immediate response to any complaints.

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April 30, 2018
Page 24

An acoustical firm will be on-call to address any noise issues that cannot be resolved by the KIC
staff.
The following best management practices will be used for nighttime construction to reduce the
noise impact of the project on residences.
•
•
•
•
•
•
•
•
•
•

Pre-set up of equipment before night shift begins
Turn 2-way radio volumes down when possible
Avoid slamming of truck beds, truck tailgates, and equipment buckets
Idle equipment motors down when the equipment is not in immediate use
All equipment will be maintained to meet manufacturer’s specifications
Schedule trucks properly to minimize long queue lines
Minimize backup distances for trucks and other equipment
Truck traffic will travel on established truck routes
Locate light plants and compressors away from residences and businesses when in close
proximity to residences and install localized noise shielding when possible
Utilize portable sound barriers if feasible near jackhammer, mounted impact hammer, shears,
and concrete saw work.

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April 30, 2018
Page 25

In addition to adhering to these best management practices, we will implement the following
practices to manage the impact on the community.
•
•
•
•
•
•

•

Provide an I-70 hot line for questions and concerns
Contact all complainants and attempt to resolve any problems or issues
Implement a noise-monitoring plan to verify noise levels within the 86 dBA LMax and 75
dBA LEQ noise level contours
If other mitigation efforts cannot be achieved, KIC will provide vouchers for hotel rooms to
residents within an “eligibility zone” on nights where exterior noise levels are expected to
exceed the noise levels allowed for Construction Activities at their residences
Provide weekly schedules through social media, email, and a website.
CDOT has committed to provide residents close to the highway construction—between 45th
Avenue and 47th Avenue from Brighton Boulevard to Colorado Boulevard—two free
portable or window-mounted air conditioning units with air filtration and assistance for the
potential additional utility costs during construction.
CDOT has committed to provide residents close to the highway construction—between 45th
Avenue and 47th Avenue from Brighton Boulevard to Colorado Boulevard—interior storm
windows

Project Location and Haul Routes
The project is located on the I-70 Corridor from I-25 to Chambers Road in Denver.
Haul routes will be a combination of utilizing I-70 and adjacent frontage roads and will be routed
to minimize impact to the community wherever possible.

Petitioner’s Information:
Peter Remington
Kiewit Infrastructure Co.
160 Inverness Drive West, Suite 110
Englewood, CO 80112
office: 303-649-6800

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April 30, 2018
Page 26

Petitioner?s Signature:

Should you have any future concerns, please do not hesitate to contact me at 303-649-6800 and
thank you for your attention this matter.

Sincerely, 7

Peter Remington
Kiewit Infrastructure Co.
Construction Manager