HomeMy WebLinkAboutPN_Project Narrative_250909_v1.pdf1. Project name:
NWR South 23 – 25 Pavement Repair Project XL6747
2. The nature, source, intensity and locaƟon of the sound/project limits:
Nature: Pavement PreservaƟon along specific highways within the City of Renton
Source: Temporary ConstrucƟon Equipment
Intensity: range between 61 – 97 dBA at 50 feet and 41 – 77 dBA at 500 Ō
LocaƟons:
SR 167 Milepost (MP) MP 26.18 to MP 27.18
SR 515 MP 6.70 to MP 6.93
3. DescripƟon of work:
This project will provide crack sealing and asphalt patching on highways in Maintenance Areas 4 and 5
covering SR 515, SR 167, SR 161, SR 18, SR 523, SR 520, I-405, SR 202, I-90, and I-5 ramps. NWR Materials
has determined that numerous routes require strategic preservaƟon before a paving project can be
programmed to address deterioraƟng roadway condiƟons. Specifically for the City of Renton, this project
will occur along SR 167 MP 26.18 to MP 27.18 and SR 515 MP 6.70 to MP 6.93.
4. The equipment and vehicles used for the work:
Item
#
Equipment Sound
level
(dBA)
at 50Ō
Sound
level
(dBA)
at
100Ō
Sound
level
(dBA)
at
300Ō
Sound
level
(dBA)
at
500Ō
Type of ConstrucƟon work
1 Backhoe /
Excavator
76 70 60 56 Digging and scooping materials
2 Backup and
Movement
alarm
79 73 64 59 Pouring concrete, warning for work site
3 Ground
Compactor
75 69 59 55
CompacƟng and flaƩening surfaces
4 Air
Compressor
66 60 50 46 GeneraƟng power
5 Diamond
Concrete
Grinder
97 91 81 77 Pavement preservaƟon technique to
correct surface imperfecƟons
6 Concrete Mixer
Truck
81 75 66 61 Pouring concrete
7 Concrete Saw 85 79 70 65 Cuƫng concrete and pavement
8 Flatbed Truck 74 71 66 64 TransporƟng people and materials
9 Generator 67 61 52 47 GeneraƟng power / Generator
10 Jackhammer 91 85 75 71 Breaking, Breaking asphalt, Breaking
concrete
11 Joint Sealer 74 71 66 64 Seals joints
12 Light Tower 61 55 45 41 Generates light
13 Asphalt Paver 83 80 75 73 Paving asphalt
14 Dump Truck 82 76 66 62 TransporƟng materials (idle)
15 Material
transfer
Vehicle
73 70 65 63 TransporƟng materials (moving)
16 Concrete
paving -
Texturing and
Curing
Machine
73 67 58 53 Sealing concrete
17 Power Tool –
Air Hose
93 87 77 73 Clearing debris
18 Power Tool –
Grinder
68 62 52 48 Grinding metal and concrete
19 Roller 82 79 75 72 CompacƟng materials
20 Vacuum Street
Sweeper
81 78 74 71 Sweeping up and vacuuming materials
21 Traffic Control
Equipment
74 68 62 54 Support traffic control – truck mounted
aƩenuators and portable changeable
message signs.
5. Proposed Noise MiƟgaƟng Measures the applicant will implement to minimize the sound level violaƟons:
• All trucks performing export haul shall have well maintained bed liners as inspected and accepted by
the Engineer.
• Truck tailgate banging is prohibited. All truck tailgates shall be secured to prevent excessive noise from
banging.
• A copy of the noise exempƟon shall be kept on the project site at all Ɵmes.
• WriƩen noƟficaƟons detailing the anƟcipated work schedule, project duraƟon, and a 24-hour noise
complaint number will be sent to all residents and businesses located within 500 feet of the project
boundary, at least 14 calendar days prior to any anƟcipated nighƫme construcƟon work.
• Contractor and WSDOT personnel must refrain from parking and idling vehicles near residenƟal areas.
6. Any addiƟonal informaƟon or studies regarding any aspect of the requested variance that is deemed
necessary to complete the review of the variance request:
This project is exempt from WAC 197-11-800(26) state transportaƟon projects. This project is a repair
project that occurs within the exisƟng right of way and in a manner that substanƟally conforms to the
preexisƟng design, funcƟon, and locaƟon as the original except to meet current engineering standard
and the acƟon does not result in addiƟon lanes, changing of capacity, or the funcƟonal use of the
highway.
7. The hours during the day and/or night the noise will occur:
Monday to Thursday, from 9 PM to 5 AM
8. The number of days and/or nights the noise will occur:
15 cumulaƟve nights
9. The ambient sound level during the Ɵme of day or night for which the variance is being sought:
Level of highway traffic noise depends on volume, speed, and mix of trucks. Based off WSDOT’s Biological
Assessment Chapter 7 Table 7-3 Typical noise levels for traffic volumes at a given speed and Washington
State Pavement Management System.
SR 167 daily noise range levels: 66 to 80 dBA
SR 515 daily noise range levels: 63 to 72 dBA
10. The Ɵme period (include start date and end date) for which the variance is requested:
March 1, 2026 to December 31, 2026
11. The reason for which the noise violaƟon cannot be avoided, i.e. why work cannot be performed within
allowed Ɵmes:
WSDOT traffic recommends that lane closures be done at night when traffic volumes are low enough to
handle closures. ConstrucƟon related lane closures during the dayƟme could cause delays to the
traveling public, impact bus routes and business access, jeopardize workers’ and public safety.
Performing work at night will minimize the danger to workers and the traveling public from road
closures, detours and traffic delays. In addiƟon, dayƟme lane closures could backup and adversely
impact traffic and city arterials. Therefore, lane closures during the nighƫme are necessary for this
project.
12. MiƟgaƟng condiƟons the applicant will implement to minimize the sound level violaƟons:
See #5