HomeMy WebLinkAboutA_KCESI2_Noise_Variance_181119_v1.pdfNovember 14, 2018 King County Wastewater
Treatment Division
Jennifer Henning, AICP
Planning Director
City of Renton Planning Division
1055 South Grady Way
Renton, WA 98057
RE: King County Eastside Interceptor Section 2 Rehabilitation – Phase II, Request for Noise Variance
Dear Ms. Henning:
King County Wastewater Treatment Division respectively requests a temporary noise variance to
rehabilitate in situ the 96-inch wastewater main running under and along Logan Avenue N. The pipeline
is in critical need of repair due to severe corrosion from hydrogen sulfide gas. To complete the
rehabilitation during the low flow period in the wastewater line it will be necessary to perform work at
night, which at times may require the nighttime noise regulations to be exceeded. Therefore, King
County is requesting relief from the requirements of Renton Municipal Code, Title VIII, Chapter 7 – Noise
Regulations and the Washington Administrative Code Chapter 173-60. Attached to this letter are the
submittal requirements for a noise variance (for more than 2 days) requiring a public hearing.
Sincerely,
Darlene Gaziano
Water Quality Planner
King County Wastewater Treatment Division
206-263-0562
dgaziano@kingcounty.gov
NOISE VARIANCE FOR MORE THAN TWO DAYS (PUBLIC HEARING)
Page 4 of 12 | Published: 1/25/2018
WAIVER OF SUBMITTAL REQUIREMENTS
FOR LAND USE APPLICATIONS (Public Hearing)
Planning Division
1055 South Grady Way-Renton, WA 98057
Phone: 425-430-7200 | www.rentonwa.gov
LAND USE PERMIT SUBMITTAL REQUIREMENTS: WAIVED BY: MODIFIED BY: COMMENTS:
Arborist Report 4
Biological Assessment 4
Calculations 1
Colored Maps for Display 4 JTH Ok to bring to hearing
Construction Mitigation Description 2 AND 4 Noise mitigation measure for
proposed worka
Deed of Right-of-Way Dedication 1
Density Worksheet 4
Drainage Control Plan 2
Drainage Report 2
Elevations, Architectural 3 AND 4
Environmental Checklist 4
Existing Covenants (Recorded Copy) 1 AND 4
Existing Easements (Recorded Copy) 1 AND 4
Flood Hazard Data 4
Floor Plans 3 AND 4
Geotechnical Report 2 AND 3
Grading Elevations & Plan, Conceptual 2 RN
Grading Elevations & Plan, Detailed 2 RN
Habitat Data Report 4 JTH
Improvement Deferral 2
Irrigation Plan 4
a Proposed work is the work done during the time the noise variance is required
PROJECT NAME:
DATE:
King County Eastside Interceptor Section 2 Rehabilitation
11/19/18
NOISE VARIANCE FOR MORE THAN TWO DAYS (PUBLIC HEARING)
Page 5 of 12 | Published: 1/25/2018
LAND USE PERMIT SUBMITTAL REQUIREMENTS: WAIVED BY: MODIFIED BY: COMMENTS:
King County Assessor's Map Indicating Site 4
Landscape Plan, Conceptual 4
Landscape Plan, Detailed 4
Legal Description 4
Letter of Understanding of Geological Risk 4
Map of Existing Site Conditions 4
Master Application Form 4
Monument Cards (one per monument) 1
Neighborhood Detail Map 4
Overall Plat Plan 4
Parking, Lot Coverage & Landscaping Analysis 4
Plan Reductions (PMTs) 4 JTH
Post Office Approval 2
Plat Name Reservation 4
Plat Plan 4
Preapplication Meeting Summary 4
Public Works Approval Letter 2
Rehabilitation Plan 4
Screening Detail 4
Shoreline Tracking Worksheet 4
Site Plan 2 AND 4
Stream or Lake Study, Standard 4 JTH
Stream or Lake Study, Supplemental 4 JTH
Stream or Lake Mitigation Plan 4 JTH
Street Profiles 2
Title Report or Plat Certificate 1 AND 4
Topography Map 3
Traffic Study 2
Tree Cutting/Land Clearing Plan 4
Urban Design Regulations Analysis 4
Utilities Plan, Generalized 2 RN Project plans for proposed worka
Wetlands Mitigation Plan, Final 4 JTH
Wetlands Mitigation Plan, Preliminary 4 JTH
a Proposed work is the work done during the time the noise variance is required
NOISE VARIANCE FOR MORE THAN TWO DAYS (PUBLIC HEARING)
Page 6 of 12 | Published: 1/25/2018
LAND USE PERMIT SUBMITTAL REQUIREMENTS: WAIVED BY: MODIFIED BY: COMMENTS:
Wetlands Report/Delineation 4 JTH
Wireless:
Applicant Agreement Statement 2 AND 3
Inventory of Existing Sites 2 AND 3
Lease Agreement, Draft 2 AND 3
Map of Existing Site Conditions 2 AND 3
Map of View Area 2 AND 3
Photosimulations 2 AND 3
This Requirement may be waived by:
1.Property Services
2 Development Engineering Plan Review
3 Building
4 Planning
PUBLIC HEARING NOISE VARIANCE PROCESS AND REQUIREMENTS (CONT ’D)
Page 7 of 12 | Published: 1/25/2018
INTAKE CHECKLIST
Use the following checklist as a guide to prepare the permit submittal package. The applicant should contact the
assigned City Project Manager if there are any questions regarding submittal requirements. Marking an item as “Not
Applicable” or “N/A”, without acceptable justification, may result in the submittal being rejected at Intake.
Submittal Items, as applicable
Included N/A All Checklists/Studies/Reports Required Unless Waived by City Staff
_____ Land Use Permit Application
_____ Waiver Form
_____ Fees
_____ Project Narrative
See attached sheet.
_____ Variance Request Justification
Please provide a written statement separately addressing and justifying each of the issues to be
considered by the City. The burden of proof as to the appropriateness of the application lies with the
applicant. In order to approve a variance request, the Reviewing Official must find ALL the following
conditions exist. See attached sheet.
_____ Plat Certificate or Title Report
Please provide a current Plat Certificate or Title Report obtained from a title company documenting
ownership and listing all encumbrances of the involved parcel(s). The Title Report should include all
parcels being developed, but no parcels that are not part of the development. If the Plat Certificate or
Title Report references any recorded documents (i.e. easements, dedications, covenants), the
referenced recorded document(s) must also be provided. All easements referenced in the Plat
Certificate must be located, identified by type and recording number, and dimensioned on the Site
Plan.
_____ Neighborhood Detail Map
Please provide a map drawn at a scale of 1" = 100' or 1" = 200' (or other scale approved by the Planning
Division) to be used to identify the site location on public notices and to review compatibility with
surrounding land uses. The map shall identify the subject site with a much darker perimeter line than
surrounding properties and include at least two cross streets in all directions showing the location of
the subject site relative to property boundaries of surrounding parcels. The map shall also show: the
property's lot lines, lot lines of surrounding properties within a minimum distance of three (300’) feet
from the site, boundaries of the City of Renton (if appli cable), north arrow (oriented to the top of the
plan sheet), graphic scale used for the map, and City of Renton (not King County) street names for all
streets shown. Please ensure all information fits on a single map sheet. which shows properties within
a minimum distance of 300 feet from the site
_____ Site Plan/Project Plan
Please provide a fully-dimensioned plan sheet drawn at a scale of 1"=20' (or other scale approved by
the Planning Division). We prefer the site plan be drawn on one sheet of paper unless the size of the
site requires several plan sheets to be used. If you are using more than a single plan sheet, please
indicate connecting points on each sheet.
The Site Plan should show the following:
Name of proposed project;
Date, scale, and north arrow (oriented to the top of the paper/plan sheet);
Drawing of the subject property with all property lines dimensioned and names of adjacent
streets;
Widths of all adjacent streets and alleys;
Location of all existing public improvements including, but not limited to, curbs, gutters,
sidewalks, median islands, street trees, fire hydrants, utility poles, etc., along the full property
frontage;
Location and dimensions of existing and proposed:
X
X
X
X
X
X
X
X
NOISE VARIANCE FOR MORE THAN TWO DAYS (PUBLIC HEARING)
Page 8 of 12 | Published: 1/25/2018
1.structures
2.parking, off-street loading space, curb cuts and aisle ways
3.fencing and retaining walls
4.free-standing signs and lighting fixtures
5.refuse and recycling areas
6.utility junction boxes and public utility transformers
7.storage areas and job shacks/sales trailers/model homes
Setbacks of all proposed buildings from property lines;
Location and dimensions of all easements referenced in the title report with the recording
number and type of easement (e.g. access, sewer, etc.) indicated;
Location and dimensions of natural features such as streams, lakes, required buffer areas,
open spaces, and wetlands; and
Ordinary high water mark and distance to closest area of work for any project located within
200-feet from a lake or stream.
_____ Utilities/Construction Plan, Generalized (sewer, water, stormwater, transportation improvements)
Please provide a plan drawn on 22" x 34" plan sheets using a graphic scale of 1" = 40' (or other size or
scale approved by the Planning Division) clearly showing all existing (to remain) and proposed public
or private improvements to be dedicated or sold to the public in cluding, but not limited to, curbs,
gutters, sidewalks, median islands, street trees, fire hydrants, utility poles, free -standing lighting
fixtures, utility junction boxes, public utility transformers, etc., along the full property frontage. The
finished floor elevations for each floor of proposed and existing (to remain) structures shall also be
shown.
_____ Colored Maps for Display (Optional)
You may choose to provide a colored version of each plan sheet for use in presenting the project to
the Hearing Examiner at the Public Hearing:
Neighborhood Detail Map
Site Plan
X
X
1
NOISE VARIANCE NARRATIVE
1.Project Name
King County Eastside Interceptor Section 2 Rehabilitation – Phase II
2.The nature, source, intensity and location of the sound/project limits
The intensity, source and nature of the construction noise depends on the type of operation, location,
function of the construction equipment, and the equipment usage cycle. The project would generate
construction noise along the pipeline alignment and at the two staging areas. Some of this noise would
be fairly constant such as the running of the electric pumps and other noise would be intermittent such
as excavation of the pipeline access pits. Some construction noise may include short intense bursts of
sound (activities producing this type of noise would be conducted during daylight hours). The table in
question 4 lists the anticipated equipment that would be used and the sound produced by the
equipment at a distance of 50 feet. Figure 1 – Neighborhood Detail Map shows the location of the
construction and project limits.
3.Description of Work
The Project would consist of the rehabilitation of approximately 3,900 linear feet of the 96-inch
reinforced concrete wastewater pipe and eight (8) 48-inch diameter maintenance holes mostly located
within the Logan Avenue N. right-of-way between Lake Washington Blvd. N. and Burnett Avenue N. (see
Figure 1).
The project is needed due to severe corrosion of the pipeline as a result of exposure to hydrogen sulfide
gas. To rehabilitate the pipeline, sewer flow would be diverted via a temporary bypass system and the
pipeline would be rehabilitated in place using an in-situ liner method called Linabond. The Linabond
system results in a polyurethane coating inside of the pipe to prevent further corrosion and can be
installed using the existing maintenance holes with the pipe in the dry.
Existing wastewater flows from upstream of the in-pipe work area would be pumped into a bypass
system to allow the Linabond system to be installed. Minimal local flows from side sewer connections
within the work area would continue to flow under the installation platform. The bypass could
potentially consist of the installation of high-density polyethylene (HDPE) piping that could include three
(3) 24-inch lines. Final bypass pipe design will be provided by the Contractor. The anticipated bypass
pipeline route totals 4,200 feet. Most of the bypass line would be located above ground either side by
side or in a rack (see Figure 2). Approximately 1,200 feet of trenched temporary piping would be
located underground where access to adjacent properties needs to be maintained (see Figure 3). There
is also one maintenance hole (R02-04) that was paved over and would need to be located and restored
before the lining work can occur.
At the upstream end of the Project, there would be an excavation (aka North Pit) to access the existing
pipe. A suction trench would be located downstream of maintenance hole RO2-08 at the northern end
of the alignment within the 200-foot segment of the pipeline previously rehabilitated with Linabond.
The top of the ESI2 pipeline would be exposed, and a window would be cut from the top of the pipe to
install the bypass pump suction piping (see Figure 4). To shore the excavation, sheet piles, walers, and
beams would be used to produce watertight shoring. The soils within the excavation and within its
2
vicinity would be chemically grouted to further seal the excavation and provide structural stability. The
North Pit would be approximately 62 feet long by 17 feet wide and 9 feet deep.
The North Pit staging area will also consist of the bypass pumps and ancillary facilities. This could
include: 8 primary and 2 backup electric driven pumps; a utility meter, transformer and transfer switch;
a mobile diesel generator for backup power; two job trailers; and odor control measures (see Figure 5).
The actual number of pumps and their configuration will be determined by the Contractor, although the
Contractor will be required to use electric driven bypass pumps to minimize potential noise disruptions
to the surrounding community. There may also be a Baker Tank in the event it is necessary to dewater
the excavation pit. The staging area also includes a parking area and material and equipment storage
area. At the southern end of the Project, another small pit (aka South Pit) would be excavated to
reconnect the bypass line. This excavation will be approximately 12 feet long by 12 feet wide and 6 feet
deep. There will also be a second staging area located in the Boeing parking lot.
4. The equipment and vehicles used for the work
The following table lists the anticipated construction equipment for the project.
Equipment Sound Level at 50
feet
Sound Level Limit
at 50 feetd
Construction
Front End Loader 80 dBAa 85 dBA
Back Hoe 80 dBAa 85 dBA
Excavator 85 dBAa 85 dBA
Concrete Saw 90 dBAa 90 dBA
Press-In Piling System Minimalb
Linabond System
Supply and Spray-Rig Truck N/A 85 dBA
300 kW Genset 82 dBAa 85 dBA
150 kW In-Line Heater 85 dBAa 85 dBA
10 HP Blower 85 dBAa 85 dBA
5,000 CFM Dehumidifier 85 dBAa 85 dBA
1,000 CFM Air Scrubber <85 dBAa 85 dBA
Bypass Pumping and Odor Control
Odor Control Unit 42 dBAa 85 dBA
Electric Bypass Pump 65 dBAc 85 dBA
aFHWA Construction Noise and Vibration Handbook.
b Observed sound level of 70 dBA at 2 meters (~6.5 feet) - http://pressin.org/files/pub/2002IDFC_US_White.pdf
cCarollo Engineers, Inc.
dKing County Guide Specification Section 01.35.43.
5. Proposed noise mitigating measures the applicant will implement to minimize the sound level
violations
The contract specifications for the contractor include requirements for noise control and mitigation.
The following are the anticipated contract specifications for noise control (these would be amended per
any additional conditions resulting from Renton City staff review and the Hearing Examiner’s decision):
3
A. Prepare and submit a Noise Control Plan, to be included in the Environmental Mitigation Binder,
which identifies measures to mitigate noise generated by the work.
B. At a minimum, the Noise Control Plan shall include the following:
• Hours of work operation, including daytime and nighttime hours.
• Identification of noise-generating equipment.
• Layout of equipment, including anticipated changes in layout.
• Hours of operation of each piece of equipment.
• Noise mitigation measures for each piece of equipment.
• Any additional mitigation measures not related to a specific piece of equipment.
C. Update and modify identified mitigation measures whenever major activity changes or
different noise-generating equipment is mobilized on the Site from the equipment
previously submitted.
D. List mitigation measures for each Site and for each change in major activities to be
performed at the Site.
E. The Noise Control Plan shall meet applicable noise codes and standards utilized by King County,
which meet or exceed requirements set forth by the City of Renton:
• Hours, of work at site: Section 01 14 00
• Noise Restrictions:
a. Daytime operations: hourly equivalent continuous sound level (LEQ(H)) not to exceed
85 A-weighted decibels (dBA) 50 feet from the construction boundary or at residential-
use receptors when measured at the building envelop, whichever is further.
b. Nighttime operations: the sound level exceeded 25 percent of any one hour (L25(H))
not to exceed 47 dBA at Class A EDNA receptors when measured anywhere within
the property. LEQ(H) not to exceed 53 dBA 100 feet from the construction boundary
or at Class B EDNAs with residential-use when measured at the building envelop,
whichever is further.
F. Maximum permissible environmental sound levels within the City of Renton are defined by
Section 8-7-2 of the Renton Municipal Code which adopts Section 173-60-040 of the Washington
Administrative Code (WAC). Administrative Policy/Code Interpretation #CI-143 for Municipal Code
Section RMC 8-7-4 modifies EDNA classifications listed in the Renton Municipal Code to be based
on land use, not zoning as called out in the code. Any property with residential use is considered
Class A EDNA. See the table below for maximum permissible sound levels.
EDNA of Sound
Source
EDNA of Receiving Property Class A Class B Class C
Class A 55 dBA, L25 57 dBA, L25 60 dBA, L25 Class B 57 dBA, L25 60 dBA, L25 65 dBA, L25 Class C 60 dBA, L25 65 dBA, L25 70 dBA, L25
• Modifications to the environmental sound level limits include the following:
• 10 dBA reduction during the nighttime hours between the hours of 10 p.m. and 7 a.m. when the receiving property is within Class A EDNAs.
4
G. The requested noise variance will allow for temporary exceedances of the Project noise limits
during the night time hours, which measured night time ambient noise levels already exceed (see
#9 below).
H. Noise originating from construction should be measured to verify compliance with sound level
limits at the beginning of any construction activity or when the activity, location or equipment
changes. Noise should be monitored continuously at the nearest sensitive receptor during
nighttime operations, excluding bypass pumping. Noise originating from bypass pumping during
nighttime should be measured to verify compliance with sound level limits. Compliance should
be re-verified if the number of pumps or pump type changes. All noise measurements and
monitoring should be performed by qualified staff with at least five years’ experience in noise
monitoring on construction sites, or be an Institute of Noise Control Engineering (INCE) member.
Noise measurements and monitoring should be performed with a Type 1 or Type 2 sound level
meter, as identified in ANSI S1.4 and have a factory or NIST traceable calibration within the past
12 months.
I. Since Contractor means and methods are not known to the County, the following represents a
list of potential noise mitigation measures:
1. Use electric or hydraulic tools and equipment. The use of a press-in pile system is being required to avoid loud noises associated with hammer or vibratory pile driving.
2. Adjust noisy operations with the hours of work.
3. Use noise walls on portions of the Site.
4. Use sound blankets, noise attenuation enclosures, and barriers.
5. Install individual noise barriers or enclosures around equipment.
6. Use the best available equipment and technology that assist in meeting noise requirements.
7. Close gates of screening walls, where applicable.
8. Provide equipment with properly sized and maintained mufflers and silencers as appropriate.
9. Use broad-band alarms on equipment with back-up alarms.
10. Limit engine idling time of vehicles, including delivery and haul trucks, to five minutes maximum. 11. Place loud equipment as far as possible from noise sensitive receptors.
6. Any additional information or studies regarding any aspect of the requested variance that is deemed
necessary to complete the review of the variance request
Two noise technical reports were prepared for the project by The Greenbusch Group, Inc. and are
attached to this request:
• Eastside Interceptor Section 2 Rehabilitation Phase II – Noise Criteria, January 30, 2018
• Eastside Interceptor Section 2 Rehabilitation Phase II – Noise Study, April 26, 2018
7. The hours during the day and/or night the noise will occur
Construction noise would occur 24 hours a day.
8. The number of days and/or nights the noise will occur
The noise variance request is for 365 non-consecutive nights.
5
9. The ambient sound level during the time of day or night for which the variance is being sought
Ambient nighttime noise levels were measured at the northern and southern ends of the pipeline
alignment (The Greenbusch Group Inc. January 30, 2018 – refer to Figure 2). Night sound levels (10 PM -
7 AM) varied from 53 to 65 dBA with an average of 60 dBA at the north location. At the south location,
night sound levels varied from 53 to 61 dbA with an average of 59 dBA.
10. The time period (include start date and end date) for which the variance is requested
The noise variance request is for the period from March 1, 2019 to November 30, 2020.
11. The reason for which the noise violation cannot be avoided, i.e. why work cannot be performed
within allowed times
See response to Question 1 in the noise variance justification section below.
NOISE VARIANCE JUSTIFICATION
1. That the applicant suffers practical difficulties and unnecessary hardship and the variance is
necessary because of special circumstances applicable to the applicant’s property or project, and
that the strict application of this Chapter will deprive the subject property owner or applicant of
rights and privileges enjoyed by others.
King County is requesting this noise variance to work at night because the in-pipe work associated with
the project must be completed within a 4-month dry-season window between June 1st and September
30th, 2019. Additionally, construction is set to begin April 1st allowing for only 2 months to mobilize and
install the extensive temporary bypass system. This short time frame will require multiple work crews
working nearly around the clock to be complete in one dry-season period. The requested noise variance
will allow for temporary exceedance of noise level limits during the necessary night time work hours.
Previous delays to the Project have made the repair of this interceptor line that serves the City of
Renton, Boeing facilities, and a number of other communities and business, all the more critical and
urgent.
In addition to Project schedule requirements, the variance will be needed to manage traffic and access,
while construction takes place within the right-of-way of Logan Avenue N. Logan Avenue N. is a
principal arterial that provides access to the Boeing Company, The Landing commercial area, several
apartment complexes, and single-family residences, as well as through traffic. To provide access to the
right-of-way and safe working conditions during construction it will be necessary to temporarily close
portions of the roadway, driveways, sidewalks, bus stops and access. This will place a hardship on
construction if construction is only allowed to occur during the day. By allowing nighttime work, it will
be easier to manage traffic so that the pipeline can be accessed safely and provide a work period where
it is possible to close portions of the road and access points to adjacent properties during periods of
lower traffic volumes. This will be particularly helpful near the access to the Boeing Plant and Landing
commercial area, where access needs to be maintained during the day. Because the noise limits are
lower during the evening hours, construction at night may temporarily exceed the noise levels for
sensitive receivers in the northern and southern ends of the alignment (Class A EDNAs – residential
6
areas), thus a noise variance is requested (refer to The Greenbusch Group Noise Criteria Memo for the
locations of Class A EDNAs).
2. That the granting of the variance will not be materially detrimental to the public health, welfare or
safety, or unduly injurious to the property or improvements in the vicinity of the location for which
this variance is sought.
Temporary nighttime construction is effective in lessening traffic congestion and access issues, as well as
reducing the construction period and resultant noise effects.
3. That the variance sought is the minimum variance, which will accomplish the desired purpose.
The purpose of the variance is to allow the project to be completed within the shortest timeframe and
to take advantage of the lower wastewater flow period in the pipeline. King County requests the
variance only for the duration of construction, which if allowed will shorten the construction period and
reduce the overall noise effects on the community.
4. That the variance contains such conditions deemed to be necessary to limit the impact of the
variance on the residence or property owners impacted by the variance. The variance approval may
be subject to conditions including, but not limited to, the following:
• Implementation of a noise monitoring program;
• Maximum noise levels;
• Limitation on types of equipment and use of particular equipment;
• Limitation on back-up beepers for equipment;
• Required use of noise shields or barriers;
• Restrictions to specific times and days;
• Specific requirements for documentation of compliance with the noise variance conditions;
• Specific requirements for notification to nearby residents;
• Required cash security to pay for inspection services to verify compliance;
• Required access to the project by the City to verify compliance with the noise variance
conditions;
• Specific program to allow for temporary hotel vouchers to effected residents;
• Requirements for written verification that all workers understand the noise variance conditions
for the project; and
• Provision allowing the City to immediately revoke the variance approval if the variance
conditions are violated.
Refer to Question 5 above in the noise variance narrative.
5. The importance of the services provided by the facility creating the noise and the other impacts
caused to the public safety, health and welfare balanced against the harm to be suffered by
residents or property owners receiving the increased noise permitted under this variance.
The Eastside Interceptor is critical infrastructure in the regional wastewater system. It is a major
pipeline main carrying wastewater flows from Renton and other large communities to the Metro
Wastewater Treatment Plant, and serves the property owners that would be affected by the noise. The
pipeline is suffering severe corrosion from hydrogen sulfide gas. A break in the line or loss of the
7
function would result in harmful effects to the public and environment. The interceptor has been
undergoing rehabilitation in other areas and this is a continuation of the overall project.
6. The availability of practicable alternative locations or methods for the proposed use, which will
generate the noise.
There are no practicable alternative locations to the pipeline rehabilitation site and the prescribed
Linabond method of rehabilitation in situ would generate less noise and overall disruption to the
community than excavating and replacing the entire pipeline.
7. The extent by which the prescribed noise limitations will be exceeded by the variance and duration of
the variance.
It is anticipated that much of the construction work at night would not exceed the City’s noise
regulations. However, there would be times that noise standards could be temporarily exceeded. That
being said, measurement of ambient noise levels indicate that the ambient noise level already exceeds
the City's regulations, and in fact that County's project is limiting the nighttime noise levels to the lowest
ambient noise level measured during the analysis. It is not possible at this time to determine the
duration or extent of noise levels above the City's regulations. There would be a number of sound
mitigation measures employed at night. Activities that produce higher levels of noise will be scheduled
to occur during the day whenever possible.
300' Noise Buffer
¯
Nighttime Activities and EquipmentBypass System Staging Area
Activity- Bypass Pumping: Continuous- Odor Control: Continuous
Equipment- Electric Bypass Pumps- Odor Control Unit
¯
Bypass SystemStaging Area
BoeingGate D-9
Figure 2 - Bypass Pipeline Configurations
Figure 3 - Trenched and Open Bypass Segments
Bypass Staging Area
Equipment/Material
Staging Area
Bus Stop
Boeing Facility
Employee Entrance
Boeing
Gate D-9
Overland Piping on Grade
Shallow Trenched Piping
Standard Trenched Piping
Overland Piping on Racks within
Shoulder/Bike Lane
ESI Sewer Pipe
KC-WTD Manhole
ESI2 Rehab Project
1700 LF
890 LF
175 LF
1425 LF
BYPASS PIPING KEY
A
E
G
H
I
J
B
C
D
Bus Stop
Alternative Bypass
Piping Route
F
The Landing
Shopping
Center
The Landing
Shopping
Center
The Landing
Parking
Garage
The Landing
Parking
Garage
Boeing
Renton
Boeing
Renton
Boeing
Renton
Boeing
Renton
Kenworth
Truck Plant
Kenworth
Truck Plant
Figure 4 - Suction Trench Schematic
Cross Beam(s)
Coupon(s) Cut From Pipe Crown
For Installation Of Suction Lines
and Replaced Following Construction
Existing ESI2 Pipe
BNSF Fenceline
Waler
Existing Pile Cap
and Piles
Sheet Piling
Chemical Grouting
Ground Improvement
Between Pipe and
Sheet Piles
Existing Grade
Figure 5 - North Pit Layout
Pump
Suction Lines
3-24" Bypass
Discharge Lines
Limits of Lined Pipe
(200' from Manhole
RO2-08)
Pump Suction
Trench
Existing 96"
ESI Pipe
PSE Power Substation
Access to be Maintained
During Construction
Trailer Mounted
Odor Control Unit
Pump Staging Area
PSE Power Substation
Bypass Piping
LEGEND
Transformer +
Recommended
Clearance
Existing
PSE Pole
Portable Generator
Switchgear w/ ATS
Site Trailer
Site Parking
Pump Discharge
Material and
Equipment
Storage Area
Potential Baker Tank
and Dewatering
Equipment Area