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Kennydale Lakeline Sewer System Replacement Project
PROJECT NARRATIVE AND CODE
CONSISTENCY ANALYSIS
Prepared for:
Carollo Engineers, Inc.
May 2025
May 2025 Page i
Kennydale Lakeline Sewer System Replacement Project PROJECT NARRATIVE AND CODE CONSISTENCY ANALYSIS
Prepared for:
Carollo Engineers, Inc.
1200 Fifth Ave, Suite 900
Seattle, WA 98101
Prepared by:
Confluence Environmental Company
Marlene Meaders
Audrey Michniak
Margaret Wolf
May 2025
This report should be cited as:
Confluence (Confluence Environmental Company). 2025. Kennydale lakeline sewer system replacement project: Project
narrative and code consistency analysis. Prepared for Carollo, Seattle, Washington, by Confluence, Seattle, Washington.
Kennydale Lakeline Sewer System Replacement Project: Project Narrative and Code Consistency Analysis
May 2025 Page i
TABLE OF CONTENTS
1.0 INTRODUCTION ................................................................................................................................................... 1
2.0 DESCRIPTION OF PROPOSED ACTION ............................................................................................................ 3
2.1 Phase 1: Upland Construction .................................................................................................................. 4
2.1.1 Project Site................................................................................................................................ 4
2.1.2 Construction Schedule .............................................................................................................. 4
2.1.3 Site Access ............................................................................................................................... 6
2.1.4 Construction Methods ............................................................................................................... 6
2.1.5 Restoration and Cleanup .......................................................................................................... 9
2.2 Phase 2: In-Water Construction ................................................................................................................ 9
2.2.1 Project Site................................................................................................................................ 9
2.2.2 Construction Schedule ............................................................................................................ 10
2.2.3 Site Access ............................................................................................................................. 10
2.2.4 Construction Methods ............................................................................................................. 12
2.2.5 Restoration and Cleanup ........................................................................................................ 12
2.3 Operations and Maintenance .................................................................................................................. 13
2.4 Conservation Measures .......................................................................................................................... 14
2.4.1 Avoidance Measures .............................................................................................................. 14
2.4.2 General Erosion and Sedimentation Control Measures .......................................................... 15
2.4.3 Preserve Vegetation/Mark Clearing Limits .............................................................................. 16
2.4.4 Establish Construction Access ................................................................................................ 16
2.4.5 Control Flow Rates ................................................................................................................. 17
2.4.6 Install Sediment Controls ........................................................................................................ 17
2.4.7 Stabilize Soils and Protect Slopes .......................................................................................... 17
2.4.8 Protect Drain Inlets ................................................................................................................. 18
2.4.9 Control Pollutants .................................................................................................................... 18
2.4.10 Control De-Watering ............................................................................................................... 19
2.4.11 Maintain BMPs and Manage the Project ................................................................................. 20
2.4.12 Measures to Reduce or Control Noise Impacts ...................................................................... 20
2.4.13 Measures to Reduce or Control Environmental Health Hazards............................................. 21
2.4.14 Phase 2 In-Water Construction BMPs .................................................................................... 21
3.0 PROJECT IMPACTS .......................................................................................................................................... 22
3.1 Phase 1: Upland Work ............................................................................................................................ 22
3.2 Phase 2: In-Water Work ......................................................................................................................... 23
4.0 PROJECT COMPLIANCE WITH RENTON MUNICIPAL CODE ........................................................................ 24
4.1 Environmental Regulations and Overlay Districts: Shorelines Overlay Districts (RMC 4-3-090C) ......... 25
4.2 Environmental Regulations and Overlay Districts: General Development Standards (RMC 4-3-
090D) .................................................................................................................................................... 26
Kennydale Lakeline Sewer System Replacement Project: Project Narrative and Code Consistency Analysis
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4.3 City-wide Property Development Standards: Fences, Hedges, and Retaining Walls (RMC 4-4-040) .... 28
4.4 City-wide Property Development Standards: Tree Retention and Land Clearing Regulations (RMC
4-4-130) ................................................................................................................................................. 29
4.5 Street and Utility Standards: Sanitary Sewer Standards (RMC 4-6-040)................................................ 31
4.6 Street and Utility Standards: Utility Lines – Underground Installation (RMC 4-6-090) ............................ 34
4.7 Permits (General and Appeals): Public Notice Requirements (RMC 4-8-090) ....................................... 35
4.8 Street Excavations: Trench Restoration and Street Overlay Requirements (RMC 9-10-11) .................. 36
5.0 REFERENCES .................................................................................................................................................... 37
TABLES
Table 1. General information by phase .................................................................................................................... 3
Table 2. Proposed temporary project impacts for Phase 1 .................................................................................... 22
Table 3. Proposed project impacts for Phase 2. .................................................................................................... 23
Table 4. Project compliance with performance standards per RMC 4-3-090C. ..................................................... 25
Table 5. Project compliance with performance standards per RMC 4-3-090D. ..................................................... 27
Table 6. Project compliance with performance standards per RMC 4-4-040. ........................................................ 29
Table 7. Project compliance with performance standards per RMC 4-4-130. ........................................................ 30
Table 8. Project compliance with performance standards per RMC 4-6-040. ........................................................ 32
Table 9. Project compliance with performance standards per RMC 4-6-090. ........................................................ 34
Table 10. Project compliance with performance standards per RMC 4-8-090. ........................................................ 35
Table 11. Project compliance with performance standards per RMC 9-10-11. ........................................................ 36
FIGURES
Figure 1. Kennydale project parcels and existing lakeline sewer system location .................................................... 2
Figure 2. Example view of land-based sewer system design .................................................................................... 5
Figure 3. Phase 2 project site access and staging areas ........................................................................................ 11
APPENDICES
Appendix A – Kennydale Lakeline – Site Conditions Table
Kennydale Lakeline Sewer System Replacement Project: Project Narrative and Code Consistency Analysis
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ACRONYMS AND ABBREVIATIONS
2024 SWMMWW 2024 Stormwater Management Manual for Western Washington
BMP best management practice
CDF controlled density fill
CESCL Certified Erosion and Sediment Control Lead
City City of Renton
CY cubic yards
ESC erosion and spill control
HDD horizontal directional drilling
HDPE high density polyethylene
ILS individual lift station
Kennydale lakeline system Kennydale Lakeline Sewer System
lakeline system Kennydale Lakeline Sewer System
LF linear feet
NTU nephelometric turbidity units
OHWM ordinary high water mark
PVC polyvinyl chloride
R-6 Residential-6
R-8 Residential-8
RMC Renton Municipal Code
ROW right-of-way
SCADA Supervisory Control and Data Acquisition
SEPA State Environmental Policy Act
SF square feet
SSDP Shoreline Substantial Development Permit
TESC Temporary Erosion and Sediment Control
the project Kennydale Lakeline Sewer System Replacement Project
WAC Washington Administrative Code
Kennydale Lakeline Sewer System Replacement Project: Project Narrative and Code Consistency Analysis
May 2025 Page 1
1.0 INTRODUCTION
The Kennydale Lakeline Sewer System (Kennydale lakeline system or lakeline system) is owned
and operated by the City of Renton (City) and provides sanitary sewer service to Kennydale
Beach Park and 56 private properties along Lake Washington from the north end of Gene
Coulon Memorial Beach Park to just south of May Creek (Figure 1). The 4,680-foot-long lakeline
system consists of a flush station, an 8-inch cast iron sewer pipe buried offshore in Lake
Washington, 3 manholes, and a system of 37 gravity side sewer laterals connecting customers to
sewer treatment. The Lake Washington No. 2 lift station pumps the flow from the lakeline
system and the basin to the north to the King County Eastside Interceptor, the regional
conveyance system, and then to the King County South Plant where it is treated. The Kennydale
lakeline system is a low-pressure system that operates by collecting fresh lake water via an
intake pipe at the flush station located at the north end of Gene Coulon Park and pumping
water through the line to convey wastewater collected by the lateral connections to the Lake
Washington No. 2 lift station at the north end of the lakeline system near North 40th Street. The
initial 300 feet of the lakeline system is in upland habitat and the rest is predominantly buried
below the lakebed, within approximately 50 feet of the shoreline.
From 2016 to 2019, the City conducted an assessment of the Kennydale lakeline system, which
included an attempt to clean and video inspect the entire system in 2018. Due to its location,
varying water depth and pipe grade, lack of access points, and the original construction
methods used, the City was only successful in cleaning and inspecting approximately 80% of
the lakeline system. As part of the hydraulic assessment, it was concluded that the hydraulic
capacity of the Kennydale lakeline system is reduced, indicative of partial blockages in two
general areas. These partial blockages are likely the result of solids settlement caused by
velocities below those needed for self-cleaning, delamination of the interior lining of the pipe,
and settlement of the lakeline infrastructure over time resulting in undulating slopes with high
and low points that prevent full evacuation of wastewater. Current access from the shoreline for
cleaning is limited, and settled solids cannot effectively be removed.
The City concluded that the Kennydale lakeline system needed to be replaced based on the
results of the 2016 to 2019 assessment. While technically feasible, in-lake alternatives were
anticipated to have significantly higher costs compared to an upland grinder pump system.
Additionally, state and federal permitting agencies require applicants to demonstrate that there
is no practical alternative prior to approving new construction in a regulated waterbody. After
participating in the in-water sewer workgroup, considering environmental and permitting
factors, and evaluating numerous alternatives, the City selected a land-based individual lift
station (ILS) system with grinder pumps as the preferred alternative because an upland grinder
pump system significantly reduces the risk to the environment at a lower cost and because past
cleaning and maintenance attempts of an in-water system have partially failed.
Kennydale Lakeline Sewer System Replacement Project: Project Narrative and Code Consistency Analysis
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Figure 1. Kennydale project parcels and existing lakeline sewer system location
Kennydale Lakeline Sewer System Replacement Project: Project Narrative and Code Consistency Analysis
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The Kennydale Lakeline Sewer System Replacement Project (the project) is being designed and
permitted per applicable regulatory requirements. Once the replacement system is complete,
the existing lakeline system will be decommissioned. This document provides information
related to the Renton Municipal Code (RMC) and project compliance with critical areas
regulations (RMC 4-3-050B) and Shoreline Master Program (SMP) regulations (RMC 4-3-090B).
The project requires environmental review pursuant to the State Environmental Policy Act
(SEPA) and a Shoreline Substantial Development Permit (SSDP). This information meets the
requirements for a project narrative needed for an SSDP. Additional information is provided in
the Lake Study related to critical areas. The Lake Study is provided under a separate cover and
is included as part of the SSDP permit application package.
2.0 DESCRIPTION OF PROPOSED ACTION
The purpose of the project is to provide reliable and easily maintainable sewer service to Renton
shoreline residences that integrates with the existing sewer conveyance and pumping system
and that has the least aquatic environmental impact possible. This project is needed because the
existing Kennydale lakeline system that was installed in Lake Washington in 1972 is reaching
the end of its useful life and is unable to be maintained in its current location.
There are two phases of the work: (1) upland, and (2) in-water. The general information for each
phase is identified in Table 1.
Table 1. General information by phase
Category Phase 1 Phase 2
Project
Information
Name Upland Work In-Water Work
Length 4,950 LF 4,680 LF
Location City ROW, City property, private
residences, and public parks
Lake Washington (Lakeline) and just upland from
Lake Washington (Flush Station, Lift Station)
Section/
Township/
Range
S32, T24N, R5E
S31, T24N, R5E
S6, T23N, R5E
S32, T24N, R5E
S31, T24N, R5E
S6, T23N, R5E
Zoning Residential-8, Residential-6
Aquatic (Lakeline),
Residential-8 (Flush Station)
Residential-6 (Lift Station)
Shoreline Designation Single Family Residential,
Urban Conservancy
Aquatic (Lakeline),
Single Family Residential (Flush Station)
Project Cost $10.1 million $615,000
Materials Excavation 9,562 CY 33 CY
Fill 9,562 CY 39 CY
Distance from OHWM 5 to 200 feet from the shoreline
(upland grinder pump stations)
~50 feet from the shoreline (in-water lakeline)
33 feet from the shoreline (upland flush station)
19 feet from the shoreline (upland lift station)
Water Depths N/A 6 to 20 feet (Lakeline)
CY = cubic yards; LF = linear feet; OHWM = ordinary high water mark; ROW = right-of-way
Kennydale Lakeline Sewer System Replacement Project: Project Narrative and Code Consistency Analysis
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The proposed action is described below in Section 2.1 for the upland phase and Section 2.2 for
the in-water phase. This section also includes a description of operations and maintenance of
the replacement sewer system (Section 2.3) and conservation measures used during
construction for both phases of the work (Section 2.4).
2.1 Phase 1: Upland Construction
Phase 1 includes replacing the existing Kennydale lakeline system with a land-based sewer
system. The following information includes a description of the: (1) project site, (2) construction
schedule, (3) site access, (4) construction methods, and (5) restoration and cleanup.
2.1.1 Project Site
The new land-based sewer system includes installation of a low-pressure sanitary sewer force
main, discharge laterals, and grinder pumps (Figure 2). A total of 54 private residences and the
Kennydale Beach Park will connect to the new force main via discharge laterals from the front,
back, or side yards of each property and the park (Appendix A). There are 2 residences that are
currently served by the Kennydale lakeline system that will connect to a gravity system instead
of a grinder pump. The new force main and discharge laterals will be at a minimum of 3 feet
deep. Each house will have its existing gravity sewer line rerouted to its own grinder pump
station with the 2 exceptions stated above. The discharge pipe (approximately 1 ¼ inches in
diameter) from the grinder pump stations will be routed to the new force main that will be
installed within Mountain View Ave N or the unnamed access road that is part of the King
County Parks right-of-way (ROW) to the east and upland of the existing private residences.
Phase 1 covers a total parcel area of approximately 1,681,600 square feet (SF), or 39 acres, which
includes 62 parcels, a linear force main in adjacent roadways that is approximately 3,000 linear
feet (LF), and discharge laterals that add up to approximately 5,000 LF. A total of 55 grinder
pumps will be added to service the private residences and Kennydale Beach Park. The total
ground surface disturbance includes approximately 113,670 SF, which is a small portion of the
total parcel area. Note that the value for disturbance area adds approximately 15% to the
anticipated impact values to account for potential changes during final design. The proposed
project impacts are described in detail in Section 3.0.
2.1.2 Construction Schedule
Construction of the individual ILS with grinder pumps is projected to begin in early 2026. The
anticipated duration of construction is approximately 12 to 18 months, working in phases to
minimize the duration in any one portion of the project area. The time at each property will
vary but is estimated at approximately 10 to 15 working days, which will likely be completed in
several smaller intervals.
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Figure 2. Example view of land-based sewer system design
Kennydale Lakeline Sewer System Replacement Project: Project Narrative and Code Consistency Analysis
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Detailed construction phasing will be determined by the contractor and their selected means
and methods. It is generally anticipated that construction will be completed in 3 zones,
associated with the 3 force main discharges. The electrical system and force main in the adjacent
roadways will need to be tested and operational prior to completing lateral and side sewer
connections to the grinder pump stations.
2.1.3 Site Access
Vehicular access to the project site is limited. There are 2 roadways that serve all properties
connected to the Kennydale lakeline system: (1) Mountain View Ave N and (2) an unnamed
access road owned by King County Parks that parallels Lake Washington Blvd N (Figure 1).
These 2 roadways cross the Eastside Rail Corridor (Eastrail), a public multi-use trail. The
roadway and adjacent parking is on land that includes City ROW and parcels owned by King
County Parks that includes Kennydale Beach Park and the Eastrail. The unnamed road
paralleling Lake Washington Blvd N is the access for the private properties in the project site.
These properties have addresses of Lake Washington Blvd N, but the unnamed roadway is
separated from Lake Washington Blvd N by the Eastrail.
Vehicular access to Mountain View Ave N is just west of the intersection of Lake Washington
Blvd N and N 33rd Street. Vehicular access to the access road owned by King County Parks
adjacent to Lake Washington Blvd N is just west of the intersection of Lake Washington Blvd N
and N 37th Street (Figure 1). Staging will be located on Mountain View Ave N, the access road
part of King County Parks property, or the property directly adjacent to the area being
constructed (Figure 2). Sections of roadways adjacent to the work areas and City-owned parcels
will be used in stages for the entire upland construction period (spring 2026 to fall 2027).
2.1.4 Construction Methods
Construction for the land-based sewer system will potentially use a combination of open-trench
excavation and trenchless technologies, such as horizontal directional drilling (HDD). Both
methods are described below, although project impacts (refer to Section 3.0) are based on
assuming open-trench excavation for the entire project. If HDD methods are used, then project
impacts will be reduced. The City will own and maintain the new sewer system including the
individual grinder pumps. The City will use existing easements or negotiate access agreements
with each property owner to provide for the routine maintenance of the grinder pumps as well
as emergency access in the event of a pump failure.
2.1.4.1 Grinder Pump Installation
Each ILS will be a prefabricated grinder pump unit manufactured by E-One (or equivalent) and
includes a buried basin connected to a discharge lateral to receive wastewater flow. Each
discharge lateral will connect the ILS to the force main in the Mountain View Ave N or the
access road that is part of King County Parks property. Each ILS with grinder pumps will have
Kennydale Lakeline Sewer System Replacement Project: Project Narrative and Code Consistency Analysis
May 2025 Page 7
an above-ground local control panel within approximately 20 feet. A conduit for power and
control signal communications will be installed between the control panel and the ILS. The
power will also extend to the control panel from the proposed electrical distribution system in
the adjacent roadways.
In general, ILS with grinder pumps will be installed on the lake side of the houses within an
excavated 50 to 100 SF area. Excavation within private properties may require a mini-excavator,
vacuum excavator truck, high-pressure water knife, and dump truck. For each ILS, a discharge
lateral and electrical service line will be installed from the roadways across private property.
Once the ILS is operational, the gravity sewer line from the house will be rerouted from the
existing lakeline side sewer lateral to the ILS. The existing lakeline side sewer will be
permanently abandoned by capping the pipe upland (i.e., no in-water work).
Installation of each ILS will require lowering the grinder pump unit into the excavated area,
using vertical installation to avoid damage. The weight of the grinder pump unit varies
depending on model and dimensions but is likely to be approximately 300 pounds. The
preferred method for transporting and lowering the grinder pump is through a mini-excavator,
but where access constraints do not permit the use of a mini-excavator, manual lifting methods
or tripod-supported methods will be required. Where manual or tripod-supported methods of
installation are proposed, it is recommended that installation logistics be evaluated when
finalizing the location of the grinder pump unit.
Where ballast is required, precast concrete blocks will be used in preference to in-situ concrete
due to the proximity of the shoreline in most instances. The interaction of wet concrete and lake
water can impact the pH and water quality in the lake and should be avoided where feasible.
2.1.4.2 Open-Trench Excavation
The force main will be installed using open-cut trench methods of construction. The contractor
has been given the choice of using open-cut or trenchless methods for installation of the laterals.
For the purpose of permitting, the maximum potential impacts are estimated assuming open-
cut lateral installation. Open-cut methods consist of excavating from the surface to form a
trench or structure excavation. Trenching typically requires an excavator, dump truck, loader,
and dozer. A vibratory hammer or other compaction equipment will be required for
compaction of trench backfill. The following open-cut trenching methods are anticipated for
excavation:
A mini-excavator may be used for trenching where access allows this equipment. The
Geotechnical Report noted the presence of glacial conditions (Shannon and Wilson
2024), meaning that gripper teeth will likely be needed where excavators are used.
Vacuum excavation may be used for trenching where access is more limited. Hose
extensions can enable vacuum excavation up to approximately 150 feet from the vacuum
Kennydale Lakeline Sewer System Replacement Project: Project Narrative and Code Consistency Analysis
May 2025 Page 8
excavation truck and up to a depth of 15 feet at that range. When this method is used in
combination with a high-pressure water knife, harder glacial soils can be disturbed and
removed by the vacuum. Vacuum excavation is less likely to cause damage to other
existing utilities than other open cut methods.
Hand digging may be used where access limitations or distance from the roadway
prevent the use of a mini-excavator or vacuum excavation.
Dewatering may be required, depending on the groundwater elevation and the depth of
excavation. Groundwater levels are reported in the Geotechnical Report (Shannon and Wilson
2024). If dewatering occurs, it will require a sedimentation tank to be used on-site. However,
space constraints may limit the use of typical 18-foot long tanks.
Where ILS with grinder pumps are immediately adjacent to the Lake Washington ordinary high
water mark (OHWM) and excavation is required, dewatering volumes are likely to be
significant. There are 55 ILS with grinder pumps anticipated to be located upland between
5 feet and 200 feet landward of the OHWM. Excavation and installation work may require
water-tight shoring if the contractor cannot dewater appropriately.
Where a mini-excavator or hand digging is used, excavated material may be sidecast,
stockpiled, and potentially reused if native material is allowed. Where vacuum excavation is
used, the water/soil slurry will need to be disposed off-site and imported backfill used. The
Geotechnical Report provides recommendations on appropriate backfill material (Shannon and
Wilson 2024).
2.1.4.3 Trenchless Installation
To reduce restoration costs and disruption to residents, trenchless methods for the installation
of the laterals and electrical service to the grinder pump stations are preferred. This includes
crossing concrete driveways or other concrete paved areas, areas with limited space for
trenching between houses, and areas of detailed landscaping that would be difficult to restore.
The contract documents specify trenchless lateral installation where feasible. However, for
permitting purposes, open cut installation is assumed for all laterals, to capture the maximum
potential amount of surface disturbance/impacts.
Based on the geotechnical explorations (Shannon and Wilson 2024), the project area is
conducive to horizontal directional drilling (HDD). HDD includes advancing a pilot bore from
the roadway side of the property to the side or back yard. The pilot bore will then be
incrementally expanded (reamed) to a size large enough for pipe installation (pullback). Mini
HDD drilling systems (such as a “Ditch Witch”) are particularly suited to this application given
the limited available working room.
Kennydale Lakeline Sewer System Replacement Project: Project Narrative and Code Consistency Analysis
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The launching and receiving pit of the HDD may require temporary excavation support and
dewatering. The work area will be temporarily supported and dewatered (as necessary) using a
contractor-proposed system that will be reviewed and approved by the appropriate regulatory
authorities.
Where soil conditions require use of drilling mud for hole stability, care will be needed to avoid
inadvertent fluid release or “frac-outs,” in which drilling mud migrates from the bore to the
surface or other unintended location. A contractor contingency plan for remediation is a
recommended requirement.
The contractor will be required to submit a work plan for each on-site installation prior to
commencing work.
2.1.5 Restoration and Cleanup
All construction equipment will be removed as soon as practicable once construction activities
are completed. Temporarily affected areas will be restored in-kind to existing conditions.
Vegetation will be replaced at a 1:1 ratio using native species or replacing landscaped species.
There are a total of 4 significant trees proposed to be removed outside of critical areas or buffers
but within the shoreline. Replacement of significant trees are based on Renton and King County
codes (RMC 4-4-130H.1.b, RMC 9-13-8B, and KCC 16.82.156E.2.a,b). A Vegetation Management
Plan provides details on the location and type of restoration for each area that is disturbed
(Confluence and Tree Solutions 2025). This plan is provided under a separate cover with the
permit application package.
In some sections, the entire road base and subbase will be reconstructed (rather than trench
repair or overlays), and the asphalt surface will be reprofiled to better manage surface water
runoff. Asphalt overlay may be required in other parts of the roadway in addition to a trench
patch, depending on the location of the trench patch and the jurisdiction of the roadway. Refer
to Project Drawings for the roadway repair layout provided under a separate cover.
2.2 Phase 2: In-Water Construction
Phase 2 includes decommissioning the existing Kennydale lakeline system. The following
information includes a description of the: (1) project site, (2) construction schedule, (3) site
access, (4) construction methods, and (5) restoration and cleanup.
2.2.1 Project Site
The Phase 2 covers a total parcel area of approximately 152,520 SF, or 3.5 acres, which includes
7 parcels where work will occur to remove 3 manholes, modify the flush station, and provide
improvements at the lift station. The actual work areas are a fraction of this (875 SF). The
current Kennydale lakeline system is located approximately 50 feet from the Lake Washington
Kennydale Lakeline Sewer System Replacement Project: Project Narrative and Code Consistency Analysis
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OHWM and runs primarily parallel from south of Coleman Point to the northernmost house on
the existing lakeline at 3901 Lake Washington Blvd N. The shoreline in the vicinity of the
lakeline system corridor is entirely developed. Development primarily consists of private
residential properties with the exception of the Kennydale Beach Park. Kennydale Beach Park is
a 1.8-acre park located approximately 0.3 miles north of Coleman Point. Forty-nine of the 57
parcels where the lakeline system will be decommissioned have small docks permanently
mounted on pilings. The shorelines of all of the properties are armored with either stone or
concrete bulkheads.
2.2.2 Construction Schedule
Once the replacement system is complete (i.e., Phase 1), the existing Kennydale lakeline system
will be decommissioned. Lakeline decommissioning is scheduled to occur in 2027 or 2028 once
the upland replacement system is installed. Decommissioning work will occur during the
approved in water work window for Lake Washington (July 16-December 31) and is expected to
take approximately 6 weeks to complete. The anticipated timing is between July 16 and
September 30, but could shift depending on construction needs. Upland improvements for the
flush station and Washington Lift Station No. 2 are not dependent on in-water work windows
and can occur at any time during Phase 2 activities.
2.2.3 Site Access
The location of work is shown in Figure 3. Appendix A lists properties where in-water work is
proposed and adjacent properties that may experience temporary construction impacts (APN
3124059077, 3342103760, 3342700211, 3342700240, 0523059010). The work includes in-water
activities in Lake Washington to decommission the existing lakeline system; there will not be
any in-water construction of the new system. The project locations for the decommissioning
work are primarily aquatic and work will be staged from a floating barge and/or boat.
There is a limited amount of work in upland areas associated with decommissioning the flush
station (APN 0523059010) and upgrades to Lake Washington Lift Station 2 (APN 3342700011).
Site access for the upland work will occur from City ROW directly adjacent to the site.
Kennydale Lakeline Sewer System Replacement Project: Project Narrative and Code Consistency Analysis
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Figure 3. Phase 2 project site access and staging areas
Kennydale Lakeline Sewer System Replacement Project: Project Narrative and Code Consistency Analysis
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2.2.4 Construction Methods
The decommissioned pipeline will be left in place to avoid excavation, disturbing sediment, and
adversely affecting sensitive habitats in the project vicinity. Before decommissioning activities
begin, the lakeline will be cleaned. Lakeline cleaning will consist of flushing the line with water
to remove accumulated materials. The source of the flushing water will be the existing lake
intake to the flush station. Water used for flushing the line will be conveyed via the existing
system to the King County regional system and will not enter surface waters. Once the line is
cleaned, the pipe is proposed to be filled with lake water to avoid needing to pump controlled
density fill (CDF) into the pipeline and the potential for CDF to enter the water if there are leaks
or breaks in the pipe.
The removal of the 3 existing manholes will also occur as part of Phase 2, resulting in the
removal of approximately 33 CY of material. Removal of the manholes will occur via barge
stationed equipment (e.g., backhoe or similar) whereby the manhole will be excavated and
lifted onto the barge for removal. Fill will be added to each excavated area (refer to the
restoration and cleanup section).
The flush station located at the south end of the Kennydale lakeline system (APN 0523059010)
will be decommissioned. The intake pipe at the flush station will be left in place. The primary
work will include removing the interior components and adjacent appurtenances of the flush
station (the shelter, antenna, light, etc.). The above-grade electrical/controls shelter, electrical
vault, antenna, and site lighting will be removed. Additional details are provided in the Project
Drawings.
The Lake Washington Lift Station No. 2 is located on-land on the northern end of the lakeline
system (APN 3342700011). In addition to lakeline system flow, the lift station collects flow north
of the station from an upland gravity system and will remain with minor upgrades to its
Supervisory Control and Data Acquisition (SCADA) and electrical systems to allow for
connection to the new permanent generator. The area of the transformer and generator may
require a retaining wall or other slope stabilization method and appropriate screening as
required by code. These minor upgrades will result in approximately 500 SF of new impervious
surface area.
2.2.5 Restoration and Cleanup
Once decommissioning activities are completed, work areas will be restored to be similar to
existing surrounding conditions. For areas in-water where the manholes will be removed, the
area will be backfilled to 6 inches below original grade and then top dressed to original grade
with spawning gravel mix (estimated as 11 CY of fill). An additional 2 CY of gravels will be
placed in locations where the pipe is exposed, which is estimated at 2 locations. Finally, gravel
will be placed at the flush station intake (~2 CY). Gravel placement will provide habitat for
Kennydale Lakeline Sewer System Replacement Project: Project Narrative and Code Consistency Analysis
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juvenile salmonids as well as support spawning for sockeye salmon (Oncorhynchus nerka).
Gravel size range will be determined by specific site conditions such as exposure, wave fetch,
slope, and consultation with the Washington Department of Fish and Wildlife. It is estimated
that restoration will include a total fill of 39 CY.
2.3 Operations and Maintenance
Periodic maintenance and inspections will be required for the new land-based sewer system.
Initially, all ILS equipment will be covered under a 2-year warranty. While E-One grinder
pumps are designed to go 10 years without a service call, each grinder pump station will be
inspected annually to verify pump operation. Typically, internal grinder pump unit
replacements are needed when their age reaches 15 to 20 years. The annual inspection is to
ensure that debris that can damage or wear pump parts or build up in the tank, preventing
proper operation of the ILS, are not being flushed down the drains and into the grinder pump
station. Items that should not be discharged include large amounts of grease, paint, strong
chemicals, putting sand, kitty litter, feminine products, and cleaning wipes. While the list of
non-permitted items overlaps with the list of items that should not be discharged into the
existing Kennydale lakeline system, the transition of service will require a change in customer
use and awareness. Property owners will also be responsible for preparing the grinder pump
station prior to an extended absence from their home. In this case, the system should be flushed
with up to 30 gallons of water to clean the pipe and avoid pipe blockages from occurring while
it is unused.
The discharge lateral sewer force main for each of the ILS with grinder pumps should be
inspected semi-annually and the isolation ball valves should be cycled (opened/closed/open) to
ensure proper operation. Other maintenance activities will include the rodding and flushing of
an obstructed discharge lateral. Rodding or flushing of the force main to break up any blockage
is similar to roto-rooting a sewer main from the access points provided at the beginning and
end of the discharge lateral. Parts to be maintained in inventory include replacement polyvinyl
chloride (PVC) and high density poly ethylene (HDPE) pipe and couplings, check valve and
ball valves, control panels and wiring, and the unilateral valve assemblies.
The ILS may be subject to periodic mechanical failure. When a grinder pump unit fails, the local
alarm light will be turned on and an audible alarm will sound. In addition, cell-based error
messages will be transmitted so that a maintenance team can be dispatched. In the event of
pump failure, wastewater flow will fill the basin at the rate of use until the storage capacity is
exceeded. Once exceeded, the upstream system (including interior house plumbing) has the
potential to backup. This is similar to existing conditions – if the Lake Washington No. 2 lift
station were to fail and wastewater were to fill the lakeline system, it would eventually backup
the gravity side sewer laterals to the private residences as the storage capacity of the pipe was
exceeded.
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Typically, failed grinder pump units will be replaced with a new grinder pump core by the field
technician, so that the ILS can be returned to service quickly and the broken grinder pump core
can be repaired in a workshop. During the time when the grinder pump unit is not operational,
the associated residents will be required to restrict their discharges to the sewer system. The ILS
basins do provide some volume of storage so complete cessation of discharges to the system is
not always required.
ILS grinder pumps require electrical power and will not operate when power supply is
interrupted. The inclusion in the design of a standby generator for the project significantly
increases the redundancy of the power system so that primary power outages will not cause
interruption in service. However, there is some remaining risk from accidental damage to the
distribution system (such as construction damage to electrical conduits) or failure of electrical
components such as the automatic transfer switch or the transformers.
Access to each ILS is expected to occur via surface streets with light- to medium-duty vehicles
and/or by foot in areas where vehicles cannot access. Equipment used for maintenance will
include vacuum excavator trucks and utility vehicles. Access to specific grinder pump units will
be similar to site access during construction (refer to Section 2.1.3 above).
2.4 Conservation Measures
Per RMC 4-3-090D, mitigation sequencing is required to demonstrate that all reasonable efforts
have been examined with the intent to avoid and minimize impacts to the critical area and/or
critical area buffer (see Section 4.0 of this document for additional information regarding project
compliance with applicable City code sections). Mitigation sequencing, as outlined in RMC 4-3-
090D.2.a.iii, includes impact avoidance, minimization, mitigation, and monitoring in that order.
Avoidance of impacts is provided through design and proposed construction methods.
Minimization measures include best management practices (BMPs) that will be used during all
construction activities to avoid or minimize potential environmental impacts. Many of these
BMPs are standards that will apply universally to many project construction activities,
including upland staging areas. Site restoration and cleanup at the end of construction will
ensure that the project will result in primarily temporary impacts during construction.
2.4.1 Avoidance Measures
The following construction methods have been selected to avoid unnecessary environmental
impacts:
Converting the existing Kennydale lakeline system to an upland system will reduce the
likelihood of discharge of wastewater into Lake Washington if a break were to occur or
during routine maintenance activities.
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Abandoning the lakeline in place instead of removing it after decommissioning and
abandoning the side sewers from shore will reduce environmental impacts to Lake
Washington
HDD construction methods reduce the amount of disturbance to soils, potential impacts
to shorelines, and the risk of contamination to soils and groundwater. These methods
will be used for installation where feasible.
When feasible, use of wet concrete will be avoided when near the lake to protect water
quality and avoid aquatic life impacts. When ballast is needed for ILS close to the
shoreline, use of precast units will be preferable.
2.4.2 General Erosion and Sedimentation Control Measures
The following BMPs will be used during construction to reduce or control erosion and
sedimentation:
A Temporary Erosion and Sediment Control (TESC) Plan and a Source Control Plan will
be developed and implemented for all clearing, vegetation removal, grading, ditching,
filling, soil compaction, or excavation. The BMPs in the plans will be used to control
sediments from all vegetation removal or ground disturbing activities.
A Construction Stormwater Pollution Prevention Plan (CSWPPP) will be developed to
protect local water quality during construction.
The contractor will designate at least one employee as the erosion and spill control (ESC)
lead, also called a Certified Erosion and Sediment Control Lead (CESCL; BMP C160).
The CESCL will be responsible for the installation and monitoring of erosion control
measures and maintaining spill containment and control equipment. The CESCL will
also be responsible for ensuring compliance with all erosion and sediment control
requirements.
All exposed soils will be stabilized during the first available period, and no soils will
remain without stabilization for more than two days from October 1 to April 30 or for
more than seven days from May 1 to September 30.
Disturbed areas will be returned to existing or improved conditions (e.g., replanting or
repaving) as soon as practical after construction is completed.
With a limited storm drainage system along the alignment, construction site dewatering
discharge locations should be identified during the design process. Where catch basins
are not close to construction, dewatering volumes may need to be stored, removed, and
disposed of off-site.
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2.4.3 Preserve Vegetation/Mark Clearing Limits
The following BMPs will be implemented as defined in the 2024 Stormwater Management
Manual for Western Washington (2024 SWMMWW) (Ecology 2024) to ensure that project work
is confined to the approved work area.
Preserving Natural Vegetation (BMP C101): The purpose of preserving natural
vegetation is to reduce erosion wherever practicable. Limiting site disturbance is the
single most effective method for reducing erosion. Natural vegetation should be
preserved on steep slopes, near perennial and intermittent watercourses or swales, and
on building sites in wooded areas. Trees and other vegetation within the work area to be
preserved during construction will be designated with high visibility fencing at a
sufficient distance to prevent soil compaction or root damage. Additionally, during
construction, the duff layer, native topsoil, and vegetation will be retained to the
maximum extent practicable.
High Visibility Fence (BMP C103): High-visibility fencing is intended to restrict
clearing and construction to the approved limits and prevent disturbance in those areas
that should be protected. Prior to beginning land disturbing activities, the work area
limits will be clearly delineated with high visibility fencing. Additionally, any sensitive
areas and their buffers or significant trees to be retained will be marked for preservation.
Tree Protection during Construction (BMP T101): The tree protection procedures and
requirements as outlined under T101 will be completed, including:
- The submittal of a Tree Protection Plan by the project arborist outlines the location
and specifics of each significant tree (Tree Solutions 2025).
- The installation of tree protection fencing around the tree protection zone at a
sufficient distance to prevent both above- and below-ground impacts.
- The installation of mulch or woodchips in the tree protection zone.
- Long-term care and monitoring of preserved trees.
- The supervision of all tree protection activities by the Project arborist, as needed.
2.4.4 Establish Construction Access
The only BMP necessary for this project to achieve a contained construction access is
stabilization measures at the entrance/exits (BMP C105). Stabilized construction accesses are
established to reduce the amount of sediment transported onto paved roads outside the project
site by vehicles or equipment (Ecology 2024). This is done by constructing a stabilized pad of
quarry spalls at entrances and exits for project sites. Construction access shall be stabilized
Kennydale Lakeline Sewer System Replacement Project: Project Narrative and Code Consistency Analysis
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wherever traffic will be entering or leaving a construction site if paved roads or other paved
areas are within 1,000 feet of the site.
2.4.5 Control Flow Rates
The 2 BMPs proposed to control flow rates are a sediment trap (BMP C240) and temporary
storage tank or vacuum excavator truck. A sediment trap is a small temporary ponding area
with a gravel outlet used to collect and store sediment from sites during construction (Ecology
2024). Sediment traps, along with other perimeter controls, shall be installed before any land
disturbance takes place in the drainage area.
Temporary storage tanks, baker tanks, or vacuum excavator trucks will be used to control
sediment and flow rate. Storage will be used when collecting sediment-contaminated
stormwater that is not collected by inlet protection installed in catch basins or ends up collecting
at low points around the project site. The contractor will discharge stormwater at a controlled
rate to prevent erosion downstream of the project site once turbidity is controlled. The
contractor will determine the final placement of this equipment.
2.4.6 Install Sediment Controls
Wattles (BMP C235) will be implemented as defined in the 2024 SWMMWW to ensure that no
sedimentation occurs. Wattles are temporary erosion and sediment control barriers consisting of
straw, compost, or other material that is wrapped in netting made of natural plant fiber or
similar encasing material. They reduce the velocity and can spread the flow of rill and sheet
runoff and can capture and retain sediment. Wattles will be installed as needed to slow flows
and as secondary protection along silt fence.
2.4.7 Stabilize Soils and Protect Slopes
The following BMPs will be implemented as defined in the 2024 SWMMWW to ensure that
disturbed soils are stabilized.
Mulching (BMP C121): Mulching soils provides immediate temporary erosion
protection and additionally enhances plant establishment. Mulching may be used in
combination with seeding and planting.
Topsoiling/Composting (BMP C125): Topsoiling and composting provide a suitable
growth medium for final site stabilization with vegetation. Although the priority is to
retain existing native soils and duff layers, topsoil and compositing may be used where
project construction has resulted in poor soil quality.
Sodding (BMP C124): Sodding established turf for immediate erosion protection and to
stabilize drainage paths. Sod may be installed in combination with seeding and planting
to reestablish turf in the areas of existing lawn on the Project site.
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Nets and Blankets (BMP C122): Erosion control blankets will be installed on steep
slopes that are susceptible to erosion and where ground-disturbing activities have
occurred. This will prevent erosion and assist with establishment of native vegetation.
Temporary and Permanent Seeding (BMP C120): Seeding reduces erosion by
stabilizing exposed soils. Seeding may be used in combination with planting throughout
the project on disturbed areas that have reached final grade.
Plastic Covering (BMP C123): Plastic covering provides immediate, short-term erosion
protection to slopes and disturbed areas.
2.4.8 Protect Drain Inlets
The project will protect drain inlets (catch basins) from turbid water or sediment discharges
using drain inlet protection (BMP C220). Inlet protection prevents coarse sediment from
entering drainage systems prior to permanent stabilization of the disturbed area. The project
will provide protection for all storm drain inlets downslope and within 500 feet of a disturbed
or construction area unless those inlets are preceded by a sediment trapping BMP. Storm drain
inlet protection is required at all times for functioning catch basins.
2.4.9 Control Pollutants
The following BMPs will be implemented as defined in the 2024 SWMMWW to ensure that
construction activities are not releasing pollutants into the site.
Concrete Handling (BMP C151): Concrete work can generate process water and slurry
that contain fine particles and high pH, both of which can violate water quality
standards in the receiving water. Concrete spillage or concrete discharge to surface
waters of the State is prohibited. This BMP will minimize and eliminate concrete,
concrete process water, and concrete slurry from entering waters of the state.
Saw cutting and Surfacing Pollution Prevention (BMP C152): Saw cutting and
surfacing operations generate slurry and process water that contains fine particles and
high pH. The project will follow the design and installation specifications outlined in the
2024 SWMMWW, that include vacuuming slurry and cuttings during cutting and
surfacing work, detaining slurry, and process water, and disposing of all waste materials
appropriately.
- If warranted, an impervious material will be placed over concrete or asphalt after
pouring to avoid direct contact with stormwater as the pavement cures.
- Washout from concrete trucks will not be dumped into storm drains or onto soil or
pavement that carries stormwater runoff.
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Material Delivery, Storage and Containment (BMP C153): This BMP is intended to
prevent, reduce, or eliminate the discharge of pollutants to the stormwater system or
watercourses from material delivery and storage. This may be accomplished through the
following measures:
- Storing fuels and other potential contaminants in secured containment areas.
- Containing equipment, materials, and wash water associated with construction.
- Conducting regular inspections, maintenance, and repairs of fuel hoses,
hydraulically operated equipment, lubrication equipment, and chemical/petroleum
storage containers.
- Regularly maintaining spill containment and clean up material at construction sites.
- Establishing a communication protocol for handling spills (e.g., ESC lead).
- Refueling construction equipment and vehicles away from surface waters whenever
practicable
The following specific control measures will be implemented during the HDD work:
An effectively contained mud pit will be established outside of sensitive areas to support
the drilling activities.
Mud pumps and a solids control/drilling fluid filter system will remove excess mud
from the borehole and ensure that the surrounding area is not contaminated from a
hydrofracture.
A vacuum excavator truck will be provided on standby at bore exit location.
A pressure relief well may also be established outside of sensitive habitat during
construction to avoid the potential for a hydrofracture.
Hay bales, visqueen, and silt fences will be kept on-site to contain potential excess
material during HDD construction.
2.4.10 Control De-Watering
Open-trench excavation work will require installation of a shoring system or equivalent method
to isolate the work area from the surrounding environment. A trench will be created using
typical cut-and-cover methods. The trench will be dewatered (as necessary). All water
encountered during the excavations will be routed through sedimentation tanks and discharged
at an approved location.
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HDD work will begin with a pilot bore that will be progressively reamed to incrementally
expand the HDD bore hole diameter sufficiently for pipe installation (pullback). All water
encountered during the excavations will be routed through sedimentation tanks and discharged
at an approved location, as discussed above.
2.4.11 Maintain BMPs and Manage the Project
The project will ensure the maintenance and repair of BMPs to ensure proper function and
protection, as follows:
All temporary and permanent erosion and sedimentation control measures will be
inspected, maintained, and repaired on a regular basis to ensure continued performance
of their intended functions.
- Fences will be inspected immediately after substantial rainfall and at least daily
during prolonged rainfall.
- Sediment will be removed as it collects behind fences and prior to their final
removal.
- Regular street cleaning will occur where necessary to control mud and dust, and
minimization measures will be taken to minimize tracking of sediment onto
roadways by construction vehicles.
Should any BMPs not function as intended, the contractor will take additional action to
minimize erosion, maintain water quality, and achieve the intended environmental
performance.
Materials On Hand (BMP C150): Quantities of erosion prevention and sediment control
materials will be kept at the project site at all times to be used for regular maintenance
and emergency situations such as unexpected heavy summer rains.
CESCL (BMP C160): As noted above, the project proponent will designate a
representative in charge of ESC, and water quality protection. The CESCL is responsible
for ensuring compliance with all erosion and sediment control and water quality
requirements.
Scheduling (BMP C162): The contractor will schedule the project to reduce the amount
and duration of soil exposed to erosion by wind, rain, runoff, and vehicle tracking.
2.4.12 Measures to Reduce or Control Noise Impacts
The primary measure to reduce or control noise impacts is to adhere to the construction
standards identified under RMC 4-4-030C.3. Construction activities for single family residential
Kennydale Lakeline Sewer System Replacement Project: Project Narrative and Code Consistency Analysis
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areas shall be restricted to the hours between seven o’clock (7:00) a.m. and ten o’clock (10:00)
p.m., Monday through Friday. Work on Saturdays and Sundays shall be restricted to the hours
between nine o’clock (9:00) a.m. and ten o’clock (10:00) p.m.
Other BMPs that may be used to reduce noise generated from equipment used during
construction activities include:
The contractor may equip construction equipment engines with adequate mufflers,
intake silencers, and engine enclosures to reduce their noise by 5 to 10 dBA.
The contractor may turn off construction equipment during prolonged periods of non-
use to eliminate extraneous noise.
Temporary diesel generators and temporary pumping equipment to be operated at
night may be required to be fitted with sound attenuation equipment.
2.4.13 Measures to Reduce or Control Environmental Health Hazards
During construction, BMPs will be implemented to minimize the potential for spills or
mechanical failures to occur and to minimize the potential for adverse effects from fuels, fluids,
and lubricants to workers, nearby residents, or the environment. During construction, it will be
the responsibility of the contractor to adhere to all applicable regulations.
Applicable project BMPs identified above will also reduce or control environmental health
hazards. Additionally, the project will comply with the following Renton regulations: fire code,
wastewater treatment codes, and construction spill protocols.
2.4.14 Phase 2 In-Water Construction BMPs
During Phase 2, the following in-water construction BMPs will include:
All equipment to be used for construction activities shall be cleaned and inspected prior
to arriving at the project site, to ensure no potentially hazardous materials are exposed,
no leaks are present, and the equipment is functioning properly.
Construction equipment shall be inspected regularly to ensure there are no leaks of
hydraulic fluids, fuel, lubricants, or other petroleum products. Should a leak be detected
on heavy equipment used for the project, necessary repairs will be made immediately
before equipment continues to be used.
Initially, as the floating turbidity curtain is deployed, both sides will be together. Once at
the project site and in contact with the lake bottom, the sides will be separated to enclose
the project area and ensure no fish are located within the turbidity curtain perimeter.
Kennydale Lakeline Sewer System Replacement Project: Project Narrative and Code Consistency Analysis
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After the turbidity curtain is deployed, project work will be conducted only within the
enclosed area.
Turbidity monitoring will occur during project work.
Turbidity curtain removal will only occur after water quality sampling shows that water
quality has returned to allowable limits. According to the Washington Administrative
Code (WAC) 173-201A-200 (1)(e) Table 200, the limits for Salmonid Spawning, Rearing,
and Migration in fresh water are that turbidity shall not exceed: 5 nephelometric
turbidity units (NTU) over background when the background is 50 NTU or less; or a
10% increase in turbidity when the background turbidity is more than 50 NTU.
Equipment will be checked daily for leaks and be well maintained to prevent grease,
lubricants, or other deleterious materials from entering state waters.
The boat and/or barge will not be allowed to ground on the substrate.
For all in water work, applicable work windows will be implemented to avoid and
minimize potential impacts to fish.
3.0 PROJECT IMPACTS
The following section includes an assessment of impacts based on the proposed construction
methods by project phase.
3.1 Phase 1: Upland Work
Phase 1 will result in temporary surface impacts, excavation of already impacted locations, and
fill to install the new land-based sewer system (Table 2). Fill quantities will be similar to
excavation quantities and fill material will be clean, well-graded, granular soil to provide
drainage and frost protection (Shannon and Wilson 2024). Proposed impacts will be temporary,
and the site will be returned to existing conditions (or better) following installation of the new
land-based sewer system. The values in Table 2 are conservative, including a 15% bulking factor
for excavations and 15% added to the disturbance areas, to account for changes as design
progresses. If the contractor is able to use HDD methods for installation of the discharge
laterals, then impact quantities will be reduced.
Table 2. Proposed temporary project impacts for Phase 1
Material Impacted Length (LF) Disturbance Area (SF) Disturbance Area + 15% (SF) Excavation (CY) Excavation + 15% (CY)
Grinder Pump Installation
Asphalt N/A 200 230 21 24
Specialty Pavement/ Concrete/ Gravel N/A 1,300 1,495 139 160
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Material Impacted Length (LF) Disturbance
Area (SF)
Disturbance
Area + 15% (SF)
Excavation
(CY)
Excavation
+ 15% (CY)
Lawn N/A 1,400 1,610 149 171
Landscape N/A 2,600 2,990 277 319
Subtotal 0 5,500 6,325 586 674
Open-Trench Excavation (Discharge Laterals)
Asphalt 631 3,888 4,471 254 292
Specialty Pavement/ Concrete/ Gravel 1,536 11,321 13,019 757 871
Lawn 1,012 6,432 7,397 422 485
Landscape 1,347 10,454 12,022 704 810
Subtotal 4,526 32,095 36,909 2,137 2,458
Open-Trench Excavation (Force Main)
Asphalt 2,716 50,398 57,958 4,583 5,270
Specialty Pavement/ Concrete/ Gravel 127 760 874 127 146
Lawn 0 0 0 0 0
Landscape 0 0 0 0 0
Subtotal 2,843 51,158 58,832 4,710 5,417
Electrical Service
Asphalt 1,006 7,582 8,719 616 708
Specialty Pavement/ Concrete/ Gravel 0 0 0 0 0
Lawn 0 0 0 0 0
Landscape 240 2,507 2,883 266 306
Subtotal 1,246 10,089 11602 882 1,014
TOTAL 8,615 98,842 113,668 8,315 9,562
CY = cubic yards; LF = linear feet; SF = Square feet
3.2 Phase 2: In-Water Work
Phase 2 project work will result in minor excavation for the removal of the 3 existing manholes
(Table 3). The in-water locations where there is excavation, exposed pipe, or the flush station
intake pipe will receive a limited amount of gravels to restore the area to better than existing
conditions. Note that the number of exposed locations is not known but is assumed to be a
minimum of 2 locations. The decommissioned pipeline will be left in place to avoid excavation,
disturbing sediment, and adversely affecting sensitive habitats within the project vicinity.
Table 3. Proposed project impacts for Phase 2.
Location Disturbance Area
(SF) Depth (feet) Excavation (CY) Fill (CY)
Lift station (upland) 500 N/A N/A N/A
Flush station intake 25 2 N/A 2
Manhole removal (n=3) 300 3 33 33
Exposed pipe (n=2) 50 2 N/A 4
TOTAL 875 N/A 33 39
CY = cubic yards; SF = Square feet
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4.0 PROJECT COMPLIANCE WITH RENTON MUNICIPAL CODE
This section summarizes how the proposed project complies with RMC requirements.
Generally, project work will occur in City ROW, City property, King County Parks property
(APN 3124059004 and 3224059005), and on private property, extending approximately from
3905 Lake Washington Blvd N, Renton, WA, 98056 to the northern end of Gene Coulon
Memorial Beach Park (1201 Lake Washington Blvd N, Renton, WA 98056). The Phase 1 project
site is in both the Residential-6 (R-6) zone and R-8 zones and overlaps shoreline overlay districts
including Urban Conservancy and Single Family Residential shoreline designations. The Phase
2 project site is in the Aquatic zone and R-8 zone associated with the flush station and R-6 zone
associated with the lift station. Both the flush station and lift station are in a Single Family
Residential shoreline designation.
The project is be considered a utilities, small use, as it impacts small scale facilities serving a
local area within the City. The project site is within regulated shoreline areas, high erosion
hazard areas, medium and high landslide hazard areas, sensitive slope areas, and wellhead
protection area zone 2. The City maps (Renton 2025) and Arborist Report (Tree Solutions 2025)
show that there are mature trees on the project site. Replacement of trees removed is provided
in the Vegetation Management Plan (Confluence and Tree Solutions 2025) provided under a
separate cover.
Below is an analysis of the following RMC sections that are applicable to this project:
Environmental Regulations and Overlay Districts: Shorelines Overlay Districts (RMC 4-
3-090C)
Environmental Regulations and Overlay Districts: General Development Standards
(RMC 4-3-090D)
City-wide Property Development Standards: Fences, Hedges, and Retaining Walls
(RMC 4-4-040)
City-wide Property Development Standards: Tree Retention and Land Clearing
Regulations (RMC 4-4-130)
Street and Utility Standards: Sanitary Sewer Standards (RMC 4-6-040)
Street and Utility Standards: Utility Lines – Underground Installation (RMC 4-6-090)
Permits (General and Appeals): Public Notice Requirements (RMC 4-8-090)
Street Excavations: Trench Restoration And Street Overlay Requirements (RMC 9-10-11)
The purpose of this analysis is to show that the project is an allowed use and to demonstrate
project consistency with these RMC sections. This section also describes how the project will
minimize and manage adverse environmental effects to critical areas and critical area buffers.
Additional information is provided in the Lake Study (Confluence 2025) provided under a
separate cover regarding critical areas.
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4.1 Environmental Regulations and Overlay Districts: Shorelines
Overlay Districts (RMC 4-3-090C)
The project location lies in the Single Family Residential and Urban Conservancy overlay
districts. The purpose of the Urban Conservancy Shoreline Overlay District is to protect,
conserve, restore and manage existing areas with ecological functions of open space, floodplain,
and other sensitive lands where they exist in urban and developed settings, while allowing
compatible uses. The purpose of the Single Family Residential Shoreline Overlay District is to
accommodate residential development and appurtenant structures that are consistent with the
Shoreline Management Element of the Comprehensive Plan. The proposed changes for this
project are currently identified in the Long-Range Wastewater Management Plan (Renton 2022).
The information in Table 4 indicates how the project will comply with relevant sections of RMC
4-3-090C.
Table 4. Project compliance with performance standards per RMC 4-3-090C.
Code
Reference Code Language Assessment
C.2. Urban Conservancy Overlay District:
a. Designation of the Shoreline Urban Conservancy Environment
Overlay District: The objectives and criteria for the designation of
this district are located in the Shoreline Management Element of
the Comprehensive Plan.
b. Application: The location of this district is found on the
Shoreline Environment Overlay Map, see subsection A8 of this
Section, and shall include:
• That portion of the Lake Washington shoreline within Gene
Coulon Park extending from one hundred feet (100') north of the
northerly end of the northernmost driveway to the northerly end
of the park.
• May Creek east of Lake Washington, including the open
space area within the Barbee Mill site.
• That portion of the south bank of the Cedar River extending
from three hundred fifty feet (350') east of I-405 right-of-way to
SR 169.
• The Cedar River, extending from SR 169 to the easterly limit
of the Urban Growth Area.
• That portion of Springbrook Creek beginning from
approximately SW 27th Street on the north to SW 31st Street on
the south, abutting City-owned wetlands in this area, and for that
portion of the west side of the creek in the vicinity of SW 38th
The project area includes a region of Urban
Conservancy Overlay District, specifically the
portion of Lake Washington shoreline north of
Gene Coulon Park where the existing flush
station is located. The only work conducted in
this location includes the following:
Remove the interior components and
adjacent appurtenances of the flush station
(the shelter, antenna, light, etc.).
Remove the above-grade electrical/
controls shelter, electrical vault, antenna,
and site lighting.
The rest of the Lake Washington shoreline of
this project includes a region of Single Family
Residential.
By section 4-3-090E, use of Urban
Conservancy or Single Family Residential area
for local service utility is permitted. This work is
part of the small utility, but is primarily to
remove infrastructure for decommissioning of
the existing Kennydale pipeline.
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Street abutting the City’s Wetlands Mitigation Bank shall be
designated conservancy.
• Per WAC 176-26-211(2)(e) all areas within shoreline
jurisdiction that are not designated within the Shoreline Master
Program are automatically assigned to be in the Urban
Conservancy Overlay District until the shoreline can be
redesignated through a Shoreline Master Program amendment
approved by the Washington State Department of Ecology. (Ord.
5976, 8-3-2020)
c. Acceptable Activities and Uses: As listed in subsection E of
this Section, Use Regulations.
C.3. Single Family Residential Overlay District:
a. Designation of the Single Family Residential Overlay: The
objectives and criteria for the designation of this district are
located in the Shoreline Management Element of the
Comprehensive Plan.
b. Application: The location of this district is found on the
Shoreline Environment Overlay Map, see subsection A8 of this
Section, and shall include those shoreline areas with residential
zoning and use located on Lake Washington, the Cedar River,
May Creek, and Lake Desire. Publicly owned park and open
space areas with residential zoning shall be excluded. (Ord.
5976, 8-3-2020)
c. Acceptable Activities and Uses: As listed in subsection E of
this Section, Use Regulations.
The project site includes the Single Family
Residential Overlay District, specifically the
portion of Lake Washington’s eastern shoreline
where there is residential zoning along Lake
Washington Blvd N and Mountain View Ave N.
The project is listed as an acceptable activity
and use in this shoreline designation.
4.2 Environmental Regulations and Overlay Districts: General
Development Standards (RMC 4-3-090D)
This project adheres to the City’s development standards for critical areas, stormwater
management, and erosion control. The project will result in no net loss of ecological function,
will maintain proper vegetated buffer areas for Urban Conservancy, will not impact stormwater
management infrastructure, and will enact erosion and sedimentation control measures. Utility
lines will be installed so that there is proper spacing between different utility line types and
buildings. Trenches for utility line installation will not be dug within the zone of influence of
any retaining wall or building. Table 5 demonstrates the project’s consistency with the relevant
sections of RMC 4-3-090D.
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Table 5. Project compliance with performance standards per RMC 4-3-090D.
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D.2.a.i No Net Loss Required: Shoreline use and
development shall be carried out in a manner that
prevents or mitigates adverse impacts to ensure no
net loss of ecological functions and processes in all
development and use. Permitted uses are designed
and conducted to minimize, in so far as practical, any
resultant damage to the ecology and environment
(RCW 90.58.020). Shoreline ecological functions that
shall be protected include, but are not limited to, fish
and wildlife habitat, food chain support, and water
temperature maintenance. Shoreline processes that
shall be protected include, but are not limited to,
water flow; erosion and accretion; infiltration;
groundwater recharge and discharge; sediment
delivery, transport, and storage; large woody debris
recruitment; organic matter input; nutrient and
pathogen removal; and stream channel
formation/maintenance.
The project will result in no let loss of ecological function
and will replace and safely decommission aging
infrastructure that would otherwise be at risk of failing and
introducing contaminated materials into Lake Washington.
Temporarily affected areas will be restored in-kind to
existing conditions. Vegetation will be replaced at a 1:1
ratio using native species or replaced in-kind on private
property and trees will be replaced at appropriate ratios.
Refer to the Vegetation Management Plan.
The project will use HDD methods where possible, which
will reduce the amount of disturbance to soils, potential
impacts to critical areas and shorelines, and the risk of
contamination to soils and groundwater. Additionally, when
feasible, use of wet concrete will be avoided when near
the lake to protect water quality and avoid aquatic life
impacts. When ballast is needed for ILS grinder pumps
close to the shoreline, use of precast units will be
preferable.
Analysis of potential bores will be undertaken during final
design, with bores near the lake shoreline reviewed to
minimize risks of discharge directly or indirectly into the
lake. A CSWPPP will be developed.
D.2.c.iii. Critical Area Regulations for Habitat Conservation
Areas: Shoreline Environments designated as Natural
or Urban Conservancy shall be considered Habitat
Conservation Areas. Regulations for habitat
conservation areas Type S Streams and Lakes are
contained within the development standards and use
standards of the Shoreline Master Program, including
but not limited to subsection F1 of this Section,
Vegetation Conservation, which establishes
vegetated buffers adjacent to water bodies and
specific provisions for use and for shoreline
modification in subsections E and F of this Section.
There shall be no modification of the required setback
and buffer for non-water-dependent uses in Type S
Fish Habitat Conservation areas without an approved
Shoreline Conditional Use Permit.
The southernmost portion of this project at the existing
flush station fall within a region of Urban Conservancy.
The project will adhere to BMPs defined by the 2024
SWMMWW, including preserving natural vegetation near
watercourses. Within the zones of Urban Conservancy,
there will be no modifications to the required buffers
without an approved Shoreline Conditional Use Permit.
D.2.e.i. Stormwater Requirements: Development shall
provide stormwater management facilities including
water quality treatment designed, constructed, and
maintained in accordance with the current stormwater
management standards. Water quality treatment
facilities shall be provided for moderate alteration of
Decommissioning the existing lakeline and installing the
new upland system will not result in changes to stormwater
management, will improve drainage of stormwater, and will
not require additional stormwater management treatment
facilities.
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nonconforming structures, uses and sites as provided
for in RMC 4-10-095.
D.2.e.i. Erosion and Sediment Control Requirements: Best
management practices for control of erosion and
sedimentation shall be implemented for all
development in shorelines through approved
temporary erosion and sediment control plan, or
administrative conditions.
The following BMPs will be used to reduce and control
erosion and sedimentation:
A TESC and source control plan will be developed
and implemented for all clearing, vegetation removal,
grading, ditching, filling, soil compaction, or
excavation.
A CSWPPP will be developed to protect local water
quality.
An ESC lead will be designated.
All exposed soils will be stabilized in the required
timeframes and disturbed areas will be returned to
existing or improved conditions as soon as practical
after construction is completed.
Reviews will consider proper locations for construction
site dewatering discharge locations and will consider
additional methods to be used to reduce erosion and
sedimentation impacts.
Wattles will be implemented as temporary erosion
and sediment control barriers, reducing the velocity of
stormwater flow and capturing and retaining
sediment.
Mulching, topsoiling, composting, sodding, nets,
blankets, seeding, and plastic covering will also be
used as needed to control erosion and sedimentation.
D.3.a. Shoreline use and development activities shall be
designed and operated to allow the public’s visual
access to the water and shoreline and maintain
shoreline scenic and aesthetic qualities that are
derived from natural features, such as shoreforms
and vegetative cover.
Vegetative cover will be retained and protected where
practicable, especially near perennial and intermittent
watercourses or swales. There will be no permanent
impacts on the public’s visual access to the water and
shoreline. Natural features, like significant trees, will be
protected when possible. When significant trees must be
removed to facilitate construction, they will be replaced at
a minimum of a 1:1 ratio. Additional details on vegetation
and tree replacement is provided in the Vegetation
Management Plan.
4.3 City-wide Property Development Standards: Fences, Hedges, and
Retaining Walls (RMC 4-4-040)
This project adheres to the City’s property development standards for fences, hedges, and
retaining walls, including their height, placement, and design. Table 6 demonstrates the
project’s consistency with the relevant sections of RMC 4-4-040.
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Table 6. Project compliance with performance standards per RMC 4-4-040.
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040.B.5. Permit Required:
a. Fences: A fence taller than seven feet (7') shall require a
building permit or a written exemption from the Building Official.
b. Retaining Walls: A retaining wall that is four feet (4') or taller,
as measured by the vertical distance from the bottom of the
footing to the finish grade at the top of the wall (i.e., not
measured by exposed retaining wall height), shall require a
building permit. This determination does not account for other
factors that may cause a building permit to be required for a
retaining wall (e.g., the addition of a surcharge or fence). (Ord.
5132, 4-4-2005; Ord. 5798, 4-25-2016; Ord. 6047, 12-13-2021)
Fences or retaining walls installed as part of
this project will be designated on a landscape
plan and grading plan with top of wall and
bottom of wall elevations. A fence and/or wall
detail will also be included on the plan. Building
permits will be obtained for building retaining
walls 4 feet or taller, as measured by the
vertical distance from the bottom of the footing
to the finish grade at the top of the wall.
040.C.2.b. Fences and Hedges Adjacent to Retaining Walls: Fences or
hedges adjacent to retaining walls with a combined height that
exceeds the allowed height of a standalone retaining wall shall
be set back by a minimum of two feet (2'); this area shall be
landscaped as if it were a terrace. If a fence is placed any
distance within the property line, the property owner continues to
be responsible for the property on both sides of the fence.
If allowed heights are exceeded by the
combined heights of fences or hedges adjacent
to retaining walls, those fences hedges will be
set back by 2 feet and landscaped like a
terrace.
040.C.2.d. Setback from Public Rights-of-Way: There shall be a minimum
three-foot (3') landscaped setback at the base of retaining walls
abutting public rights-of-way. Landscaping shall include a mixture
of shrubs and groundcover (trees are optional) in conformance
with the standards of RMC 4-4-070H4, Perimeter Parking Lot
Landscaping.
If a retaining wall is built, modified, or replaced
so that it is abutting a public right-of-way, a 3-
foot landscaped setback will be installed in
accordance with applicable standards.
040.D.1. Maximum Height: In any residential zone, the maximum height of
any fence, hedge or retaining wall shall be seventy-two inches
(72"), subject to further height limitations as specified in
subsection D2 of this Section.
No fence, hedge, or retaining wall will exceed
72 inches in height. A fence shall not be
constructed on top of a retaining wall unless the
total combined height of the retaining wall and
the fence does not exceed the allowed height
of a standalone fence.
4.4 City-wide Property Development Standards: Tree Retention and
Land Clearing Regulations (RMC 4-4-130)
This project adheres to the City’s property development standards for tree retention and land
clearing. Disturbed areas will be restored along the access road owned by King County Parks,
on City ROW, on City property, and on private property and erosion will be minimized and
vegetation retained wherever practicable. A tree retention plan, arborist report, tree inventory,
and tree retention worksheet will be submitted along with the combined application for a SSDP.
Table 7 demonstrates the project’s consistency with the relevant sections of RMC 4-4-130.
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Table 7. Project compliance with performance standards per RMC 4-4-130.
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130.C. Tree removal, vegetation management, and associated use
of mechanical equipment is permitted as follows, without the
requirement of a routine vegetation management permit,
except as provided in subsection D3 of this Section,
Restrictions for Critical Areas – General, and in RMC 4-3-
110, Urban Separator Overlay Regulations:
…
12. Utilities, Traffic Control, Walkways, Bikeways Within
Existing, Improved Rights-of-Way or Easements: Within
existing improved public road rights-of-way or easements,
installation, construction, replacement, operation,
overbuilding, or alteration of all natural gas, cable,
communication, telephone and electric facilities, lines,
pipes, mains, equipment or appurtenances, traffic control
devices, illumination, walkways and bikeways. If activities
exceed the existing improved area or the public right-of-
way, this exemption does not apply. Restoration of
disturbed areas shall be completed.
This project involves the installation of pipes in City
ROW, City property, public land, and on private
property. In both cases, disturbed areas will be
restored to baseline (or better) conditions. For work
on private property, a routine vegetation
management permit will be acquired.
130.H.3 Tree Retention/Land Clearing (Tree Inventory) Plan
Required: When a land development permit, as defined in
RMC 4-11-120, is submitted to the City it shall be
accompanied by a tree retention/land clearing (tree
inventory) plan pursuant to RMC 4-8-120, Submittal
Requirements – Specific to Application Type.
A tree retention plan will be submitted to the City to
accompany the combined application for a SSDP.
See the project drawings for additional details.
130.H.4 Arborist Report Required: When a land development permit,
as defined in RMC 4-11-120, is submitted to the City it shall
be accompanied by an arborist report pursuant to RMC 4-8-
120, Submittal Requirements – Specific to Application Type.
An Arborist Report will be submitted to the City to
accompany the combined application for a SSDP.
130.G.6. General Review Criteria: All land clearing and tree removal
activities shall comply with RMC 4-4-060, Grading,
Excavation, and Mining Regulations, and shall meet the
following criteria:
a. The land clearing and tree removal will not create or
contribute to landslides, accelerated soil creep, settlement
or subsidence, flooding, erosion, or increased turbidity,
siltation, or other form of pollution in a watercourse.
b. Land clearing and tree removal will be conducted to
maintain or provide visual screening and buffering between
land uses of differing intensity, consistent with applicable
landscaping and setback provisions of the Renton Municipal
Code.
c. Land clearing and tree removal shall be conducted so as
to expose the smallest practical area of soil to erosion for
the least possible time, consistent with an approved build-
a. The project will not contribute to erosion,
sedimentation, or other forms of watercourse
pollution through use of erosion and sedimentation
BMPs. Refer to Table 5 above for the common
BMPs to be used.
b. The applicable landscaping and setback
provisions of the RMC will be adhered to, with land
clearing and tree removal conducted so that there is
visual screening and buffering between land uses of
differing intensities.
c. All exposed soils will be stabilized during the first
available period, and no soils will remain without
stabilization for more than two days from October 1
to April 30 or for more than seven days from May 1
to September 30. Disturbed areas will be returned to
existing or improved conditions (e.g., replanting or
repaving) as soon as practical after construction is
completed.
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out schedule and including any necessary erosion control
measures.
d. Land clearing and tree removal shall be consistent with
subsection D3 of this Section, Restrictions for Critical Areas
– General, and RMC 4-3-050, Critical Areas Regulations.
e. The land clearing and tree removal shall not create or
contribute to a hazardous condition, such as increased
potential for blowdown, pest infestation, disease, or other
problems that may result from selectively removing trees
and other vegetation from a lot.
f. Land clearing and tree removal shall be conducted to
maximize the preservation of any tree in good health that is
an outstanding specimen because of its size, form, shape,
age, color, rarity, or other distinction as a community
landmark.
d. Tree removal will be consistent with applicable
restrictions and regulations.
e. Natural vegetation will be preserved on steep
slopes, near perennial and intermittent watercourses
or swales, and on building sites in wooded areas.
f. When possible, significant trees will be retained
and protected while this project is carried out. A tree
protection plan will be submitted and a project
arborist will supervise all tree protection activities.
130.G.9. Condition Measures for Tree/Ground Cover Retention: The
following measures may be used in conditioning a land
development permit or building permit proposal, to comply
with the general review criteria of subsection H6 of this
Section, General Review Criteria:
a. Trees shall be maintained to the maximum extent
feasible on the property where they are growing.
Modification of the tree retention and land clearing plan, or
the associated land development permit, may be required to
ensure the retention of the maximum number of trees.
b. The applicant may be required to replace trees, provide
interim erosion control, hydroseed exposed soils, or other
similar conditions which would implement the intent of this
Section.
c. Trees that shelter interior trees or trees on abutting
properties from strong winds that could otherwise cause
them to blow down should be retained.
Vegetation will be retained to the maximum extent
practicable. A tree protection plan will be submitted
by the project arborist and BMPs will be
implemented to preserve natural vegetation,
especially on steep slopes, near watercourses, and
in wooded areas. Trees and vegetation within the
work area that are designated to be preserved will
be marked with high visibility fencing and trees will
have tree protection zones at sufficient distances to
prevent above and below ground impacts. All
vegetation removed will be replaced at a 1:1 ratio
using native species or replaced in-kind on private
property. See the Vegetation Management Plan for
additional details.
Erosion from vegetation removal and construction
activities will be reduced and controlled during
construction through various BMPs, including a
TESC Plan. All exposed soils will be stabilized
during the first available period and additional
erosion control methods will be used, including
mulching, topsoiling, composting, sodding, nets,
blankets, seeding, and plastic covering.
4.5 Street and Utility Standards: Sanitary Sewer Standards (RMC 4-6-
040)
This project is proposing to replace the existing side sewers of 56 private residences and
Kennydale Beach Park along the waterfront and decommission the existing 8-inch force lakeline
system located in Lake Washington. Wastewater from these residences is currently draining to
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the lakeline system and the project would alter infrastructure so that they drain to newly
constructed discharge laterals and force main in the adjacent roadways. All new sewer stubs
shall conform to the standards in RMC 4-6-040 and the City Standard Details. Table 8
demonstrates the project’s consistency with the relevant sections of RMC 4-6-040.
Table 8. Project compliance with performance standards per RMC 4-6-040.
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040.E. PERMIT REQUIRED FOR CONNECTION TO CITY SEWER:
No unauthorized person shall uncover, make any connections
with or openings into, use, alter or disturb any public sewer or
appurtenance thereof without first obtaining a written permit from
the Development Services Division.
1. Connection Approval Options: Permission to make connection
to the public sewer shall consist of either:
a. A developer extension agreement, wherein permission is
granted to make an extension to a public sewer, or
b. A building sewer permit, wherein permission is granted to
make a connection from private property to a public sewer. A
building sewer permit shall include permission to construct a side
sewer whenever it is required to complete connection.
2. Permit Classes: There shall be three (3) classes of building
sewer permits:
a. For residential service;
b. For commercial service; and
c. For industrial service. (Ord. 3832, 8-13-1984)
3. Submittal Requirements and Application Fees: In each case
the owner or his duly authorized agent or representative shall
make application in writing on a special form furnished by the
City for said purposes. The permit application shall be
supplemented by any plans, specifications or other information
considered pertinent in the judgment of the Development
Services Division. The permit and inspection fees shall be as
listed in RMC 4-1-180
This project alters a public sewer utility using a
building sewer permit classed for residential
service.
040.F.2. Public sewers shall conform to the latest standards of the City,
as adopted by City Code, and to the “Recommended Standards
for Sewage Works” of the Great Lakes-Upper Mississippi River
Board of State Sanitary Engineers, and are subject to review by
the Department of Ecology of the State of Washington. All public
sewer extensions shall conform to the standards and be
The replaced section of the sewer utility will
conform to the standards and be consistent
with the City comprehensive sewer system
plan.
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consistent with the City comprehensive sewer system plan. (Ord.
4343, 2-3-1992)
040.F.3. The public sewer shall be ductile iron, AWWA C151, with Type II
push-on or Type III mechanical joints, together with cement
mortar lining three thirty seconds inch (3/32”) in accordance with
AWWA C104, or polyvinyl chloride (PVC) plastic pipe ASTM
D3034, or concrete nonreinforced ASTM C14 Class 2, or
concrete reinforced ASTM C76; rubber gaskets for concrete pipe
shall meet ASTM C443 standards; rubber gasket for PVC pipe
shall meet ASTM 1869 standards. However, when public sewers
are installed in filled or unstable ground, in areas with high
groundwater levels, or in areas where the potential for infiltration
occurs, they may be required to be either ductile iron or PVC
plastic pipe. Exact pipe material shall be as determined by the
wastewater utility. Minimum size shall be eight inches (8")
diameter. (Ord. 4343, 2-3-1992)
The new force main will be 2-inch or 3-inch
HDPE. A short section of new gravity main will
be 8-inch PVC. Side sewers will be 4-inch or 6-
inch SDR-21 PVC with rubber gasket joins and
Fernco flexible couplings (or approved equal).
Force main shall have a minimum 10-foot
horizontal and 1.5-foot vertical clearance
between sanitary and water utilities, with
clearance measured from the outside edge to
the outside edge of the pipe. Force main shall
have a minimum 7-foot horizontal and 1.5-foot
vertical clearance between sanitary and surface
water utilities.
040.F.5. Manhole Requirements:
a. Where Required: Manholes shall be installed at the end of
each line, at all changes of grade, size or alignment, at distances
no greater than four hundred feet (400') for fifteen inch (15")
diameter sewers or smaller. Greater spacing may be permitted in
larger sewers. Manholes shall be a minimum of forty eight inches
(48") in diameter, shall be precast concrete or cast in place
concrete, with steel reinforcement; steps shall be placed at one
foot (1') spacing, conforming to current safety regulations. (Ord.
4343, 2-3-1992)
b. Covers: The manhole covers shall be twenty four inches (24")
in diameter cast iron frame and covers.
c. Connections: All connections to the manhole shall match the
existing inverts or have a drop connection in accordance with the
current City standards. (Ord. 4343, 2-3-1992)
a. One new 48-inch diameter standard sanitary
sewer manhole will be installed at the upstream
end of a new gravity force main that discharges
directly to Lake Washington LS #2.
b. Manhole covers will be 24 inches in diameter
cast iron frame and covers.
c. Drop connections to existing manholes will
be in accordance with current City standards,
will not disturb integrity of joints or be within
12 inches of joints, and be made below the
cone section of the manhole.
040.F.6. All lift stations that are to be turned over for public maintenance
as well as private lift stations for commercial or multi-family
building sewers shall have alarm and standby emergency
operation systems, and meet or exceed Department of Ecology
specifications as detailed in “Criteria for Sewage Works Design”.
All private single-family lift stations shall meet or exceed the
current City standards for that type of facility.
In case of unit failure, each ILS grinder pump
will have a local alarm light, audible alarm, and
auto-transmitted cell-based error message to
alert residents and local maintenance teams. In
the event of pump failure, wastewater flow
would fill a storage basin until the storage
capacity is exceeded.
040.H. 1. Location: The connection of the building sewer into the public
sewer shall be made at a side sewer stub, if such a stub is
available at a suitable location and is found upon examination
and tests by the utility to meet all standards and specifications of
the City. If no stubs are suitably located or if the existing stub(s)
are found not to meet all standards and specifications, the
property owners shall, at their expense, have a new side sewer
stub installed.
Building sewers will be connected to the public
sewer at side sewer stubs under the
appropriate connection permit.
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2. Permit and Supervision by Utility Required: All such
connections shall be made under permit issued by the utility and
per City standards and specifications. The connection shall be
made under the supervision of the Utilities Engineer or his
representative. (Ord. 4343, 2-3-1992)
040.G.6 Trenching Standards: All excavations required for the installation
of a building sewer shall be open trench work unless otherwise
approved by the Utilities Engineer. Pipe laying and backfill shall
be performed in accordance with ASTM spec. C12-19 and
APWA spec. Sec. 60 except that no backfill shall be placed until
the work has been inspected.
This project will utilize a combination of open
trench and HDD to install sewer lines. When
methods other than open trench work are
proposed, approval will be obtained from the
Utilities Engineer.
4.6 Street and Utility Standards: Utility Lines – Underground
Installation (RMC 4-6-090)
This project adheres to the City’s requirements for underground installation and relocation of
electrical and communication facilities. Table 10 demonstrates the project’s consistency with the
relevant sections of RMC 4-6-090.
Table 9. Project compliance with performance standards per RMC 4-6-090.
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090.C.2. Existing overhead power and utility facilities abutting a
development or redevelopment site triggering street frontage
improvements under RMC 4-6-060 shall be required to be
relocated underground, pursuant to the standards of this Section.
All new proposed utility lines (i.e., electrical,
phone, and cable services, etc.) along property
frontage or in the project site will be installed or
relocated underground. The construction of
these franchise utilities will be inspected and
approved by the City.
090.R.1. Permit Required: All new or replaced electrical or communication
facilities shall require a permit from the City of Renton prior to
construction.
A permit will be obtained for installation of
electrical or communication facilities.
090.F. 1. Standards Applicable: All conductors, switches, transformers,
and regulating devices shall be installed in accordance with the
applicable national, State, and local safety standards. All
structural devices shall be designed in accordance with the
provisions of the latest edition of the International Building Code,
subject to the provisions of the immediately following subsection.
All conduit installations shall comply with City of Renton
standards.
2. Coordination with Other Facilities Required: All underground
facilities shall be installed to coordinate with other underground
facilities, i.e., water, sewer and gas pipelines, traffic control and
other signal systems. When coordination requires installation
Installed and replaced utility lines will adhere to
design standards as per City code.
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practices that are more restrictive or demanding than the
minimum standards required by applicable national, State and
local codes and safety standards, the requirements of
coordination shall be governing and controlling.
3. Wheel Load Requirements – Minimum: All vaults, handholes,
ventilation gratings, and access covers and conduit in public
rights-of-way shall be strong enough to withstand a minimum ten
thousand (10,000) pound wheel load. This wheel load
requirement may be restricted to traveled street areas, provided
the utility provider assumes responsibility for upgrading facilities
beyond the original traveled street areas if subsequent widening
occurs.
4.7 Permits (General and Appeals): Public Notice Requirements (RMC
4-8-090)
This project adheres to the City’s public notice requirements, including sign placement and
duration of posting. Table 10 demonstrates the project’s consistency with the relevant sections
of RMC 4-8-090.
Table 10. Project compliance with performance standards per RMC 4-8-090.
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090.C.1. A minimum of one public information sign shall be required for all
Type II and Type III Land Use Permits in accordance with the
following standards, unless exempted by this subsection. The
applicant shall be responsible for the procurement, installation
and maintenance of the sign.
Exempt Permits: The following Type II and Type III Land Use
Permits are exempt from the requirements of this subsection:
a. Additional animals permit;
b. Home occupation permit, special;
c. Temporary use permit – Tier II, except for temporary use
permits for personal delivery device operation and device
dispensers;
d. Temporary emergency wetland permit;
e. Development permit (special flood hazard);
f. Final plats;
At least one public information sign will be
procured, installed, and maintained.
Kennydale Lakeline Sewer System Replacement Project: Project Narrative and Code Consistency Analysis
May 2025 Page 36
Code
Reference Code Language Assessment
g. Final short plats;
h. Final binding site plans;
i. Mobile home park, final;
j. Planned urban development, final; and
k. Environmental review. (Ord. 6096, 12-5-2022; Ord. 6126, 12-
11-2023)
090.C.3. The sign shall be posted by the applicant prior to submittal of a
complete application, yet no more than five (5) days beforehand.
The sign will be posted before submittal of the
complete application, though not more than 5
days beforehand.
090.C.4. The sign shall be erected at the approximate midpoint of the
site’s street frontage and within five feet (5') of the front lot line,
or as otherwise directed by the Department for maximum
visibility. View of the sign shall not be obstructed from the
perspective of the abutting public right-of-way.
The sign will be appropriately visible and placed
at the approximate midpoint of the site’s street
frontage.
090.C.6. The sign shall not be removed until the appeal period has ended.
Removal of the sign prior to the prescribed time frame may be
cause for additional notice or appeal period. The sign shall be
removed within seven (7) days following the end of the appeal
period.
The sign will be posted for the appropriate
period and not removed until the appeal period
has ended.
090.C.7. The applicant shall submit an affidavit that states the date and
location of the posting, and a photograph of the posted sign that
provides context of its location.
An affidavit that states the date and location of
the sign and includes a photograph will be
submitted.
4.8 Street Excavations: Trench Restoration and Street Overlay
Requirements (RMC 9-10-11)
This project adheres to the City’s trench restoration and street overlay. Table 11 demonstrates
the project’s consistency with the relevant sections of RMC 9-10-11.
Table 11. Project compliance with performance standards per RMC 9-10-11.
Code
Reference Code Language Assessment
11.C. Application: The following standards in this Section shall be
followed when doing trench or excavation work within the paved
portion of any City of Renton right-of-way. Modifications or
exemptions to these standards may be authorized by the
Community and Economic Development Administrator, or
authorized representative, upon written request by the permittee,
the permittee’s contractor or engineer, and demonstration of an
equivalent alternative. (Ord. 5450, 3-2-09)
The proposed project requires some trench and
excavation work in a paved portion of a City
ROW, an access road part of King County
Parks property, or City-maintained private
roadway. The City standards for trench
restoration and street overlay will be compiled
with. See Project Drawings for additional
details.
Kennydale Lakeline Sewer System Replacement Project: Project Narrative and Code Consistency Analysis
May 2025 Page 37
Code
Reference Code Language Assessment
11.F City of Renton Standards: All materials and workmanship shall
be in accordance with the City of Renton Standard and
Supplemental Specifications (current adopted version) except
where otherwise noted in these standards. Materials and
workmanship are required to be in conformance with standards
for the Standard Specifications for Road, Bridge, and Municipal
Construction prepared by the Washington State Chapter of the
American Public Works Association (APWA) and the Washington
State Department of Transportation (WSDOT) and shall comply
with the current edition, as modified by the City of Renton
Supplemental Specifications.
The trenching methods and materials for this
project are in accordance with the City
standards, including the requirements for
patching, overlays, asphalt type, trench backfill,
trench resurfacing, pavement removal, trench
backfill, and restoration construction. See
Project Drawings for additional details.
5.0 REFERENCES
Confluence (Confluence Environmental Company). 2025. Kennydale lakeline sewer system
replacement project: Lake study. Prepared for Carollo Engineers, Seattle, Washington.
Prepared by Confluence Environmental Company, Seattle, Washington.
Confluence and Tree Solutions. 2025. Kennydale lakeline sewer system replacement project:
Vegetation management plan. Prepared for Carollo Engineers, Seattle, Washington.
Prepared by Confluence Environmental Company and Tree Solutions Inc., Seattle,
Washington.
Ecology (Washington State Department of Ecology). 2024. 2024 Stormwater Management
Manual for Western Washington. Ecology, Olympia, Washington.
Renton (City of Renton). 2022. Long-range wastewater management plan. Prepared by City of
Renton with assistance of Carollo Engineers, Inc.
Renton. 2025. COR Maps | Online Data. City of Renton, Renton, Washington.
https://maps.rentonwa.gov/Html5viewer/Index.html?viewer=cormaps (assessed on March
12, 2025)
Shannon and Wilson. 2024. Draft geotechnical engineering report: Kennydale lakeline sewer
improvements, Renton, Washington. Prepared for Carollo Engineers, Seattle, Washington.
Prepared by Shannon & Wilson Inc., Seattle, Washington.
Tree Solutions. 2025. Arborist Report. Prepared for Carollo, Seattle, Washington, by Tree
Solutions, Seattle, Washington.
Appendix A Kennydale Lakeline – Site Conditions Table
Appendix A: Kennydale Lakeline – Site Conditions Table – Organized from South to North
# Parcel Number Address Property Owner Use Site Conditions Proposed Construction Activities Photos
1 0523059010
(in-water) and
623059005
(upland)
2725 Mountain
View Ave N
City of Renton Flush Station and
Public Park (Coulon
Beach Park)
Large amount of vegetation (native and
invasive) surrounding concrete pad and
fencing
Facility adjacent to public use gravel trail
Concrete pad
Asphalt roadway
Staging/Access
Cap existing 8-inch intake in vault
The intake pipe at the flush station will be
left in place
Remove the interior components and
adjacent appurtenances of the flush station
(the shelter, antenna, light, etc.)
Remove the above-grade electrical/controls
shelter, electrical vault, antenna, and site
lighting
In-water work: gravel will be placed at the
flush station intake (~2 CY)
2 3342104050 2727 Mountain
View Ave N
Allen, Barbara A
and Bess
Caroline
Single Family
Residence
Water access
Landscaping throughout property
Fencing in backyard
Paved driveway
Grinder pump model DH017 (Pump #1)
installation in front yard
Lateral sewer force main installation in side
yard
3 3342104048 2731 Mountain
View Ave N
Winter Single Family
Residence
Water access
Landscaping throughout property
Fencing in backyard
Asphalt driveway
Grinder pump model DH017 (Pump #2)
installation in side yard
Lateral sewer force main installation in front
yard
4 3342104046 2801 Mountain
View Ave N
Brauff Single Family
Residence
Water access
Landscaping in front yard (shrubs /trees)
Deck completely covers backyard
Concrete driveway
Grinder pump model DH151 (Pump #3)
installation in front
Lateral sewer force main installation in front
yard
5 3342104045 2805 Mountain
View Ave N
Debra and
William Keppler
Single Family
Residence
Water access
Landscaping in front yard (shrubs /trees)
Concrete driveway
Backyard patio/deck
Grinder pump model DH017 (Pump #4)
installation in front yard
Lateral sewer force main installation in front
yard
Kennydale Lakeline – Site Conditions Table
2 | Page
# Parcel Number Address Property Owner Use Site Conditions Proposed Construction Activities Photos
6 3342104040 2807 Mountain
View Ave N
Kaaren and
Marc Pritchard
Single Family
Residence
Water access
Landscaping throughout property
Landscaping with large trees in front yard
Lawn in backyard
Asphalt driveway
Patio in backyard
Grinder pump model DH017 (Pump #5)
installation in backyard
Lateral sewer force main installation in side
yard
7 3342104029 2811 Mountain
View Ave N
Demund Single Family
Residence
Water access
Landscaping throughout property
Fencing along the side yard
Asphalt driveway
Pavers alongside home
Grinder pump model DH017 (Pump #6)
installation in side yard
Lateral sewer force main installation in side
yard
8 3342104010 2815 Mountain
View Ave N
Duggan Single Family
Residence
Water access
Landscaping throughout property
Fencing in backyard
Asphalt driveway
Grinder pump model DH017 (Pump #7)
installation in backyard
Lateral sewer force main installation in side
yard
Proposed electrical vault location is nearby,
across road in front of the houses and
before Eastrail
Kennydale Lakeline – Site Conditions Table
3 | Page
# Parcel Number Address Property Owner Use Site Conditions Proposed Construction Activities Photos
9 3342104009 2827 Mountain
View Ave N
Howell Single Family
Residence
Water access
Landscaping throughout property
Asphalt driveway
Paved sidewalk and patio in backyard, & boat
ramp/garage
Grinder pump model DH017 (Pump #8)
installation in backyard
Lateral sewer force main installation that
wraps around side yard and continues to
front yard
10 3342103985 2905 & 2907
Mountain View
Ave N
Joanne and
Stuart Depina
Single Family
Residence + DADU
Water access
Landscaping throughout property
Landscaping with large trees in front yard
Lawn in backyard
Paved driveway
Grinder pump model DH151 (Pump #9)
installation in side yard
Lateral sewer force main installation in side
yard
11 3342103953 2909 Mountain
View Ave N
Mountainview
LLC
Single Family
Residence + DADU
Water access
Landscaping throughout property
Landscaping along shore
Concrete driveway
Concrete sidewalk along home
Paved patio adjacent to shore
Grinder pump model DH151 (Pump #10)
installation in backyard
Lateral sewer force main installation in side
yard (shares a lateral with 3001 Mountain
View Ave N)
12 3342103942 2931 Mountain
View Ave N
Charles and
Anne Conner
Landscaped, no
structures, connected
driveway to adjacent
parcel with SFR
Landscaping throughout property
Concrete driveway
No grinder pump installation.
13 3342103940 3001 Mountain
View Ave N
Charles and
Anne Conner
Single Family
Residence
Water access
Landscaping throughout property
Rip rap along shore
Concrete driveway
Concrete sidewalk and patio in backyard
adjacent to shore
Grinder pump model DH017 (Pump #11)
installation in side yard
Lateral sewer force main installation in side
yard (shares a lateral with 2929 Mountain
View Ave N)
Kennydale Lakeline – Site Conditions Table
4 | Page
# Parcel Number Address Property Owner Use Site Conditions Proposed Construction Activities Photos
14 3342103941 3003 Mountain
View Ave N
TGM Mountain
View LLC
Single Family
Residence
Mix of grass mulch and landscaping
Pavers alongside of home
Grinder pump model DH017 (Pump #12)
installation in side yard
Lateral sewer force main installation in side
yard
15 3342103931 3005 Mountain
View Ave N
LeProwse Single Family
Residence
Trees present adjacent to pavers in side
yard
AC unit located at side yard
Grinder pump model DH017 (Pump #13)
installation in backyard
Lateral sewer force main installation in side
yard
16 3342103930 3007 Mountain
View Ave N
Fix Single Family
Residence
Water access
Gravel on either sides of home
Rip rap along shoreline
Landscaped backyard
Tight access along sides of home
Paved driveway
Grinder pump model DH017 (Pump #14)
installation in side yard
Lateral sewer force main installation in side
yard (shares lateral with 3009 Mountain
View Ave N and 3011 Mountain View Ave
N)
17 3342103924 3009 Mountain
View Ave N
Sun Jianping Single Family
Residence
Water access
Rip rap along shoreline
Landscaped backyard
Tight access along sides of home
Paved driveway
Grinder pump model DH017 (Pump #15)
installation in backyard
Lateral sewer force main installation in side
yard (shares lateral with 3007 Mountain
View Ave N and 3011 Mountain View Ave
N)
Kennydale Lakeline – Site Conditions Table
5 | Page
# Parcel Number Address Property Owner Use Site Conditions Proposed Construction Activities Photos
18 3342103920 3011 Mountain
View Ave N
Bovey Single Family
Residence
Landscaping along fencing
Area used as storage for outdoor gear
Pavers in storage area located adjacent to
home
Fencing
Grinder pump model DH017 (Pump #16)
installation in side yard
Lateral sewer force main installation in side
yard (shares lateral with 3007 Mountain
View Ave N and 3009 Mountain View Ave
N)
Proposed electrical distribution vault
location is nearby across the road and
before Eastrail
19 3342103905 3013 Mountain
View Ave N
Robert Burr Single Family
Residence
Water access
Concrete area from dock
Long paved driveway to road
Mostly grass landscaping
Grinder pump model DH017 (Pump #17)
installation in side yard
Lateral sewer force main installation in
side/front yard (shares lateral with 3015
Mountain View Ave N)
20 3342103906 3015 Mountain
View Ave N
Savoy Single Family
Residence
Property is mostly grass in backyard
Front driveway is lined with cedars and
evergreen bush
Asphalt driveway
Concrete patio in back of home
Grinder pump model DH017 (Pump #18)
installation in side yard
Lateral sewer force main installation in
side/front yard (shares lateral with 3013
Mountain View Ave N)
21 3342103895 3101 Mountain
View Ave N
Lew Single Family
Residence
Water access
Property has groundcover and trees in
backyard
North side yard is lined with tree and shrub
landscaping
Asphalt driveway
Just recently redid the backyard, including
required shoreline plantings
Grinder pump model DH017 (Pump #19)
installation in backyard
Lateral sewer force main installation in side
yard (shares lateral with 3103 Mountain
View Ave N)
Kennydale Lakeline – Site Conditions Table
6 | Page
# Parcel Number Address Property Owner Use Site Conditions Proposed Construction Activities Photos
22 3342103890 3103 Mountain
View Ave N
James and
Laura Morgan
Single Family
Residence
Water access
Property is heavily landscaped throughout
property with herbaceous and shrubs and
trees
Narrow side yard access
Backyard patio
Concrete driveway
Concrete sidewalk in front of home
Grinder pump model DH017 (Pump #20)
installation in backyard
Lateral sewer force main installation in side
yard (shares lateral with 3101 Mountain
View Ave N)
23 3342103880 3107 Mountain
View Ave N
Baker Single Family
Residence
Water access
Property is heavily landscaped with
herbaceous and shrubs
Narrow side yard access
Paved driveway
Paved backyard and side yard
Grinder pump model DH017 (Pump #21)
installation in backyard
Lateral sewer force main installation in side
yard (shares lateral with 3111 Mountain
View Ave N)
24 3342103860 3111 Mountain
View Ave N
Napoli Single Family
Residence
Water access
Heavily landscaped with grass with
herbaceous, shrubs, and trees
Small putting green
Mix of landscaping in side yard and
backyard
Paved driveway
Grinder pump model DH017 (Pump #22)
installation in backyard
Lateral sewer force main installation in side
yard (shares lateral with 3107 Mountain
View Ave N)
Kennydale Lakeline – Site Conditions Table
7 | Page
# Parcel Number Address Property Owner Use Site Conditions Proposed Construction Activities Photos
25 3342103855 3115 Mountain
View Ave N
Young Single Family
Residence
Water access
Heavily landscaped with grass with
herbaceous, shrubs, and trees
Narrow access to backyard
Paved driveway
Concrete steps on both sides of home that
lead to backyard
Landscaping along driveway
Grinder pump model DH017 (Pump #23)
installation in backyard
Lateral sewer force main installation in side
yard
26 3342103845 3119 Mountain
View Ave N
Oppfelt Single Family
Residence
Water access
Heavily landscaped with shrubs and trees
Multiple steps and staircases leading down
to waterfront from side of home
Wood decking along the side of home
Paved driveway
Paved patio and concrete stairs in backyard
Grinder pump model DH017 (Pump #24)
installation in backyard
Lateral sewer force main installation in side
yard
27 3342103840 3205 Mountain
View Ave N
Porter Single Family
Residence
Water access
Heavily landscaped with herbaceous,
shrubs, and trees
Paved driveway
Grinder pump model DH017 (Pump #25)
installation in side yard
Lateral sewer force main installation in side
yard (shares lateral with 3209 Mountain
View Ave N)
28 3342103810 3209 Mountain
View Ave N
Thomas Trust Single Family
Residence
Water access
Heavily landscaped lawn with mix of grass
and garden beds
Patio
Rip rap along shore
Fence around property
Concrete sidewalk from dock
Paved driveway
Backyard lawn
Landscaping along fence
Grinder pump model DH017 (Pump #26)
installation in backyard
Lateral sewer force main installation in side
yard (shares lateral with 3205 Mountain
View Ave N)
Kennydale Lakeline – Site Conditions Table
8 | Page
# Parcel Number Address Property Owner Use Site Conditions Proposed Construction Activities Photos
29 3342103805 3213 Mountain
View Ave N
Dahlby Single Family
Residence
Water access
Landscaped backyard with trees
Concrete sidewalk from dock
Paved driveway
Landscaping along fence
Grinder pump model DH017 (Pump #27)
installation in backyard
Lateral sewer force main installation around
to the north (shares lateral with 3217
Mountain View Ave N)
30 3342103795 3217 Mountain
View Ave N
Dahlby Single Family
Residence
Water access
Heavily landscaped lawn with mix of grass
and garden beds
Rip rap along shore
Pavers and concrete patio in backyard
adjacent to water
Concrete sidewalk along house
Paved driveway
Grinder pump model DH017 (Pump #28)
installation in side yard
Lateral sewer force main installation in side
yard (shares lateral with 3213 Mountain
View Ave N)
31 3342103775 3233 Mountain
View Ave N
Lindblad Family
Trust
Single Family
Residence
Water access
Rip rap along shore
Pavers and concrete patio in backyard
adjacent to water
Large trees in front yard
Concrete sidewalk along house
Paved driveway
Grinder pump model DH017 (Pump #29)
installation in front of house
Lateral sewer force main installation in front
yard
Connection to electrical distribution vault to
the north of the access road from Lake
Washington Blvd N to Mountain View Ave N
Kennydale Lakeline – Site Conditions Table
9 | Page
# Parcel Number Address Property Owner Use Site Conditions Proposed Construction Activities Photos
32 3342103760 N/A Scott Hansen Aquatic/no use In-water parcel In-water work: removal of manhole #5378
between House #3307 and #3233 (removal
of a 10-foot by 10-foot area to depth of 3
feet for a total of 11 cubic yards of material)
33 3124059077 3307 Mountain
View Ave N Leighton
LaValley
Single Family
Residence
Water access
Site currently under construction
Rip rap along shore
One conifer along shore
No impervious services present, site under
construction
Grinder pump model DH017 (Pump #30)
installation in side yard
Lateral sewer force main installation in side
yard
Pressurized sewer main will be routed
through parking area and back out to road
in front of the houses
In-water work: removal of manhole #5379
at the in-water edge of the property
(removal of a 10-foot by 10-foot area to
depth of 3 feet for a total of 11 cubic yards
of material)
34 3124059079 N/A Lisa Leighton Private dock entrance Water access
Fence with lawn
No grinder pump installation.
35 3124059076 3401 Lake
Washington Blvd
N
Michael and
Cheryl Atkinson
Single Family
Residence
Water access
Rip rap along shore
Landscaping adjacent to rip rap
Grinder pump model DH017 (Pump #31)
installation in side yard
Lateral sewer force main installation in side
yard
Kennydale Lakeline – Site Conditions Table
10 | Page
# Parcel Number Address Property Owner Use Site Conditions Proposed Construction Activities Photos
36 3124059075 3405 Lake
Washington Blvd
N
Gerald (Jerry)
Brennan
Single Family
Residence
Water access
Asphalt parking area on eastern portion of
property
Landscaping of trees and shrubs throughout
Grass lawn adjacent to shore
Concrete sidewalk along north and western
side of house
Grinder pump model DH017 (Pump #32)
installation next to concrete block wall
Lateral sewer force main installation under
concrete block wall
37 3124059074 3411 Lake
Washington Blvd
N
Gerald (Jerry)
Brennan
Single Family
Residence
Water access
Asphalt driveway on southern portion of
home
Home located adjacent to public use trail.
Trees and shrubs in front and behind home
Grinder pump model DH017 (Pump #33)
installation in the front yard
Lateral sewer force main installation in side
yard
38 3124059004 3501 Lake
Washington Blvd
N
King County
Parks
Public Park (Kennydale
Beach Park)
Water access
Unvegetated area adjacent to the existing
restroom facility
Stone stairs and gravel/concrete pad
Connected to Eastrail bike/walking path
Grinder pump model DX152 (Pump #34)
installation in between two rock walls at the
park
Open-trench excavation for force main
behind gate and rock wall
Open-trench excavation or trenchless
methods used to connect to generator
across Lake Washington Blvd N
39 3342700355 3601 Lake
Washington Blvd
N
Easton Single Family
Residence
Water access
Riprap shoreline
Mostly grass backyard
Paved backyard patio
Flagstone pavers alongside of home
Grinder pump model DH017 (Pump #35)
installation in side yard
Lateral sewer force main installation in side
yard (shares lateral with 3605 Mountain
View Ave N)
Kennydale Lakeline – Site Conditions Table
11 | Page
# Parcel Number Address Property Owner Use Site Conditions Proposed Construction Activities Photos
40 3342700330 3605 Lake
Washington Blvd
N
Chriest Single Family
Residence
Water access
Backyard lawn and patio
Covered dock structure
Paved driveway
Grinder pump model DH017 (Pump #36)
installation in backyard
Lateral sewer force main installation in side
yard (shares lateral with 3601 Mountain
View Ave N)
41 3342700320 3607 Lake
Washington Blvd
N
Troy Single Family
Residence
Water access
No landscaping
Backyard and side yard completely covered in
impervious surfaces
Grinder pump model DH017 (Pump #37)
installation in backyard
Lateral sewer force main installation in side
yard
42 3342700310 3611 Lake
Washington Blvd
N
Fife Single Family
Residence
Water access
Lawn in backyard
Patio in backyard
Paved driveway
Grinder pump model DH017 (Pump #38)
Lateral sewer force main installation in side
yard (shares lateral with 3613 Mountain
View Ave N)
43 3342700300 3613 Lake
Washington Blvd
N
Fife Single Family
Residence
Water access
Small landscape area in southwest portion
of property
High percentage of the property is covered
with pavers or concrete
Concrete driveway
Grinder pump model DH017 (Pump #39)
installation in side yard
Lateral sewer force main installation in side
yard (shares lateral with 3611 Mountain
View Ave N)
Kennydale Lakeline – Site Conditions Table
12 | Page
# Parcel Number Address Property Owner Use Site Conditions Proposed Construction Activities Photos
44 3342700290 3619 Lake
Washington Blvd
N
Andrew &
Megan
Albertson
Single Family
Residence
Water access
High percentage of the property is covered
with pavers or concrete
Concrete driveway
Grinder pump model DH017 (Pump #40)
installation in side yard
Lateral sewer force main installation in side
yard
45 3342700280 3625 Lake WA
Blvd N
Leveque Single Family
Residence
Water access
Backyard has no landscaping just decking
Narrow access on either side of home
Some shrubs present along either side of
home
Sidewalk on one side of house
Paved driveway
Grinder pump model DH017 (Pump #41)
installation in side yard
Lateral sewer force main installation in side
yard (shares lateral with 3703 Mountain
View Ave N)
Proposed electrical vault location is nearby
across the Eastrail next to access road from
Lake Washington Blvd N
46 3124059004
3224059005
Access road near
N 37th St. and
Lake WA Blvd N
intersection
City of Renton Access road in front of
houses (south end)
Landscaping adjacent to road
Gravel bike path adjacent to road
Asphalt road
Gravel bike path
No grinder pump installation.
47 3342700270 3703 Lake
Washington Blvd
N
Brown Single Family
Residence
Water access
Minimal landscaping
Pavers cover entire backyard
Paved driveway
Grinder pump model DH017 (Pump #42)
installation in side yard
Lateral sewer force main installation in side
yard (shares lateral with 3625 Mountain
View Ave N)
Kennydale Lakeline – Site Conditions Table
13 | Page
# Parcel Number Address Property Owner Use Site Conditions Proposed Construction Activities Photos
48 3342700260 3707 Lake
Washington Blvd
N
Reed Single Family
Residence
Water access
Small area of landscaping and grass
adjacent to shoreline and deck
Small deck in backyard connects to
staircase to home
Paved driveway
Grinder pump model DH017 (Pump #43)
installation in backyard
Lateral sewer force main installation in side
yard
49 3342700250 3709 Lake
Washington Blvd
N
Pasquier Single Family
Residence
Water access
Completely developed backyard with patio,
structure, and dock
Minimal landscaping except for a legacy tree
Paved driveway
Grinder pump model DH017 (Pump #44)
installation in backyard
Lateral sewer force main installation in side
yard
50 3342700230 3711 Lake
Washington Blvd
N
Weil Single Family
Residence
Water access
Backyard and side yard landscaping with
trees and herbaceous plants
Rip rap shoreline
Paved side yard and backyard patio
Paved driveway
Grinder pump model DH017 (Pump #45)
installation in side yard
Lateral sewer force main installation in side
yard (shares lateral with 3713 Mountain
View Ave N)
51 3342700240 3713 Lake
Washington Blvd
N
Harwood Single Family
Residence
Water access
Completely developed backyard with patio,
structure, and dock
Minimal landscaping
Boat slip
Paved driveway
Grinder pump model DH017 (Pump #46)
installation in side yard
Lateral sewer force main installation in side
yard (shares lateral with 3711 Mountain
View Ave N)
In-water work: removal of manhole #5380
between House #3715 and #3713 (removal
of a 10-foot by 10-foot area to depth of 3
feet for a total of 11 cubic yards of material)
Kennydale Lakeline – Site Conditions Table
14 | Page
# Parcel Number Address Property Owner Use Site Conditions Proposed Construction Activities Photos
52 3342700211 3715 Lake
Washington Blvd
N
Sunderland Single Family
Residence
Water access
Minimal landscaping in backyard
Elevated deck
Paved driveway
Grinder pump model DH017 (Pump #47)
installation in backyard next to elevated
deck
Lateral sewer force main installation in side
yard
In-water work: removal of manhole #5380
(see above; same manhole)
53 3342700200 3717 Lake
Washington Blvd
N
Dayton
Dennison
Single Family
Residence
Water access
Largely developed backyard with patio and
dock, fence in side yard
Landscaping
Paved driveway
Grinder pump model DH017 (Pump #48)
installation in side yard
Lateral sewer force main installation in side
yard
Connection to electrical distribution vault
location across the street close to the
Eastrail
54 3342700190 3719 Lake
Washington Blvd
N
Lindahl Single Family
Residence
Water access
Paved driveway with carport adjacent to
home
Grinder pump model DH017 (Pump #49)
installation in side yard
Lateral sewer force main installation in side
yard (shares lateral with 3805 Mountain
View Ave N)
55 3342700176 3805 Lake
Washington Blvd
N
Littleman Single Family
Residence
Water access
Landscaping along shore, including a
Hawthorn tree
Small lawn in the backyard
Paved driveway with carport adjacent to
home
Fence in front yard with an Eastern
dogwood tree
Side yard landscaping
Grinder pump model DH017 (Pump #50)
installation in backyard.
Lateral sewer force main installation in side
yard (shares lateral with 3719 Mountain
View Ave N)
The Hawthorn tree (Tree 308) will be
removed to install the new gravity sewer
system
Kennydale Lakeline – Site Conditions Table
15 | Page
# Parcel Number Address Property Owner Use Site Conditions Proposed Construction Activities Photos
56 3342700149 3811 Lake
Washington Blvd
N
Hartmann Single Family
Residence
Water access
Backyard is a mix of grass and potted plants
Storage area with fencing alongside of
home
Paved driveway
Concrete side yard
Grinder pump model DH017 (Pump #51) in
backyard.
Lateral sewer force main installation in side
yard (shares lateral with 3815 Mountain
View Ave N)
57 3342700126 3815 Lake
Washington Blvd
N
Pardi Single Family
Residence
Water access
Landscaping along shore including 2
Magnolia trees close to potential location for
grinder pump installation
Lake line appears to be adjacent to shore
Paved driveway
Paved patio throughout backyard
Grinder pump model DH017 (Pump #52)
installation in backyard
Lateral sewer force main installation in side
yard (shares lateral with 3811 Mountain
View Ave N)
The two Magnolia trees (Tree 272 and Tree
273) will be removed to install the new
gravity sewer system
58 3342700125 3821 Lake WA
Blvd N
Barinova Single Family
Residence
Water access
Landscaping with trees and shrubs adjacent
to home
Paved driveway
Paved backyard patio
Grinder pump model DH017 (Pump #53)
installation in front of house
Lateral sewer force main installation in front
of house
59 3342700110 3825 Lake
Washington Blvd
N
Nelson Single Family
Residence
Water access
Landscaping along home
Paved driveway
Grinder pump model DH017 (Pump #54) in
side yard.
Lateral sewer force main installation in side
yard (shares lateral with 3827 Mountain
View Ave N)
Kennydale Lakeline – Site Conditions Table
16 | Page
# Parcel Number Address Property Owner Use Site Conditions Proposed Construction Activities Photos
60 3342700100 3827 Lake
Washington Blvd
N
Petett Single Family
Residence
Water access
Landscaping along home
Large black locust adjacent to home
Paved driveway
Grinder pump model DH017 (Pump #55)
installation in side yard
Lateral sewer force main installation in side
yard (shares lateral with 3825 Mountain
View Ave N)
The black locust (Tree 275) will be removed
to install the new gravity sewer system
61 3342700080 3837 Lake
Washington Blvd
N
Zilmer Single Family
Residence
Water access
Surrounding landscaping that includes tree
and shrubs along driveway
Paved driveway
Open-cut installation of rerouted side sewer
connecting to new gravity sewer main in
roadway (drains to Lake WA LS No. 2).
62 3342700070 3901 Lake
Washington Blvd
N
Mclain Single Family
Residence
Water access
Surrounding landscaping that includes tree
and shrubs along driveway
Paved driveway
Open-cut installation of rerouted side sewer
connecting to new gravity sewer main in
roadway (drains to Lake WA LS No. 2).
63 3342700011 3905 Lake
Washington Blvd
N
Perotto Lake WA LS No. 2 and
Single Family
Residence
Water access
Surrounding landscaping that includes tree
and shrubs along driveway
Area accessed through fence
Adjacent to shoreline
Concrete pad
Paved driveway
Lake WA LS No. 2 is located within an
easement on the Perotto parcel.
Minor electrical improvements to connect
new permanent backup generator to LS.
Discharge to King County Metro WTD.
Cap existing 8-inch lakeline in vault.
Install a new generator and retaining wall.