HomeMy WebLinkAboutNoise Variance request (2)PUBLIC 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.
Ms. Henning
Page 2 of 2
May 9, 2017
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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 (idling) 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.