HomeMy WebLinkAboutNoise Variance requestPUBLIC WORKS DEPARTMENT
M E M O R A N D U M
DATE:
May 9, 2017
TO:
Jennifer Henning, CED Planning Director
FROM:
John Hobson, Wastewater Utility, x7279
SUBJECT:
Noise Variance Request - Renton Highlands Sewer & Manhole Rehabilitation Phase I
The City of Renton Wastewater Utility is requesting two non-consecutive nights of temporary noise variance to complete the rehabilitation of two sewer mains located on Jefferson Avenue
NE just north of its intersection with NE 10th Street. We are asking for relief from the requirements of the Renton Municipal Code, Title VIII – Health Sanitation – Chapter 7 and Noise
Level Regulations, as per section 8-7-2 and the Washington State Administration Code (WAC) Chapter 173-60, allowing the City’s contractor to work at night. The rehabilitation of these
two sewers are scheduled to occur between
June 16, 2017 and July 15, 2017.
Project Narrative:
Insituform Technologies, LLC is currently under contract with the City of Renton to rehabilitate approximately 750 linear feet of old concrete sanitary sewer main in the 1000 block of
Jefferson Ave NE. This sanitary sewer main was installed in 1942 and it shows signs of significant corrosion along with many cracks and holes.
This sewer main will be rehabilitated using a process known as “Cured-in-Place Pipe” (CIPP). This process will allow the contractor to rehabilitate all 750 linear feet of this sewer
main in one day without any excavation. However, during this process, the adjacent side sewers are plugged for up to eight hours and therefore sewer service is unavailable.
Special Circumstances:
There is a laundromat at 2804 NE 10th Street that is adjacent to the sewer main that will be rehabilitated. Since the CIPP process will temporarily plug their side sewer, it is impossible
to keep the laundromat in operation during its business hours of 10:00 AM-10:30 PM. In order to keep the laundromat in operation, the City is proposing to perform the rehabilitation
of the adjacent sewer at night.
Table 1 Equipment Sound Levels (dBA)
Equipment
Approx. Sound
Level (dBA) at
50 feet
Approx. Sound
Level (dBA) at
100 feet
Approx. Sound
Level (dBA) at
200 feet
Approx. Sound
Level (dBA) at
300 feet
Pick-up Truck
68
62
57
54
Jetter Truck
84
78
72
69
Generator
77
71
65
62
Refrigeration Truck
78
72
66
63
Proposed Nighttime Noise Mitigation Measures
To limit the potential effect of construction-related noise at the residences near the CIPP operation, several noise mitigation measures have been considered. The other mitigation measures
listed below can be considered as part of a best management practice plan.
Give at least 72 hour advance notice to nearby residents of the time periods when particularly noisy work and potential nighttime construction activities (e.g. pullback) will be occurring
through mailers, door hangers, or other similar notification methods.
Create and utilize a noise mitigation training program, which shall be implemented for all field-worker supervisory personnel including sub-contractor supervisors.
Provide disposable ear plugs to residents adjacent to the project area.
Applicant will provide the City Inspector’s phone number to residents for reporting any problems.
Applicant shall provide a summary of any complaints associated with the project to the City’s project manager.
If the above measures are determined to be insufficient, offer to relocate the nearest residents during nights when the construction activity would occur.