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Critical Areas Assessment Report
Cedar River 205 Levee Certification Project
Renton, Washington
for
Tetra Tech, Inc
October 19, 2021
Critical Areas Assessment Report
Cedar River 205 Levee Certification Project
Renton, Washington
for
Tetra Tech, Inc
October 19, 2021
1101 South Fawcett Avenue, Suite 200
Tacoma, Washington 98402
253.383.4940
Critical Areas Assessment Report
Cedar River 205 Levee Certification Project
Renton, Washington
File No. 0693-078-01
October 19, 2021
Prepared for:
Tetra Tech, Inc.
1420 5th Avenue, Suite 650
Seattle, Washington 98101
Attention: Bill Fullerton
Prepared by:
GeoEngineers, Inc.
1101 South Fawcett Avenue, Suite 200
Tacoma, Washington 98402
253.383.4940
Emily R. Hurn
Project Scientist
David B. Conlin, MS, PWS
Senior Biologist
Joseph O. Callaghan, MS, PWS
Principal
ERH:DBC:JOC:ch:leh:tlm
Disclaimer: Any electronic form, facsimile or hard copy of the original document (email, text, table, and/or figure), if provided, and any attachments are only a copy
of the original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record.
October 19, 2021| Page i
File No. 0693-078-01
1.0 INTRODUCTION .................................................................................................................................................. 1
1.1. Project Location .......................................................................................................................................... 1
1.2. Project Description ...................................................................................................................................... 1
1.3. Reach Description ....................................................................................................................................... 2
2.0 DATA REVIEW .................................................................................................................................................... 2
3.0 FIELD INVESTIGATION ....................................................................................................................................... 3
3.1. Wetland Observations ................................................................................................................................ 3
3.2. Stream and Riparian Habitat ..................................................................................................................... 3
3.2.1. Right Bank, STA 49+60 .................................................................................................................. 4
3.2.2. Right Bank, STA 63+65 to 64+35.................................................................................................. 4
3.2.3. Right Bank, STA 66+55 to 67+25.................................................................................................. 4
3.2.4. Left Bank, STA 19+20 ..................................................................................................................... 4
3.2.5. Left Bank, STA 25+45 to 29+70 .................................................................................................... 5
3.2.6. Left Bank, STA 29+70 to 34+10 .................................................................................................... 5
3.2.7. Left Bank, STA 55+70 to 56+90 .................................................................................................... 5
3.2.8. Left Bank, STA 58+10 to 58+50 .................................................................................................... 5
3.2.9. Left Bank, STA 58+55 to 59+15 .................................................................................................... 5
3.2.10. Left Bank, STA 59+15 to 59+85 .................................................................................................... 6
4.0 CONCLUSIONS ................................................................................................................................................... 6
5.0 LIMITATIONS ...................................................................................................................................................... 6
6.0 REFERENCES ..................................................................................................................................................... 7
LIST OF FIGURES
Figure 1. Cedar River Section 205 Levee System Improvement Locations Overview and Vicinity Map
Figures 2 through 6. Cedar River Section 205 Levee System Improvement Locations
APPENDICES
Appendix A. National Wetland Inventory Map
Appendix B. Soil Survey Map
Appendix C. Site Photographs
October 19, 2021| Page 1 File No. 0693-078-01
1.0 INTRODUCTION
GeoEngineers, Inc. (GeoEngineers) was contracted by Tetra Tech, Inc. (Tetra Tech) to complete a baseline
critical area assessment and prepare a Critical Areas Assessment Report for the Cedar River 205 Levee
Certification Project, located on both banks of the lower Cedar River within the city limits of Renton,
Washington. The City of Renton is proposing to perform a series of improvements at several locations along
the levee to meet current flood design standards. This Critical Areas Assessment Report describes the
wetland, stream and riparian conditions present at the location of each of the proposed levee
improvements and has been prepared in accordance with City of Renton Municipal Code (RMC) 4-3-050
(Critical Areas Regulations), 4-3-090 (Shoreline Management Program) and 4-8-120 (Permit Submittal
Requirements). This report describes existing conditions and regulations applicable to wetlands and
stream/riparian habitats and is intended to be used as a basis for mitigation sequencing during project
design and environmental permitting.
1.1. Project Location
The project reach is located along the Cedar River at the south end of Lake Washington in
Renton, Washington within Township 23 North, Range 5 West, Sections 7 and 18. The upstream side of
the Logan Avenue bridge is the upstream (southern) limit of the project reach, and the mouth of the Cedar
River at Lake Washington is the downstream (northern) reach boundary. This investigation was limited to
the areas of the proposed improvements. A Vicinity Map is included as Figure 1, Cedar River Section 205
Levee System Improvement Locations Overview and Vicinity Map.
1.2. Project Description
Potential levee improvements include modifications to the existing levee and floodwall system along both
the left and right bank of the Cedar River. The purpose of these improvements is to meet levee elevation,
freeboard and other technical requirements in accordance with the current flood model and levee criteria.
Figures 2 through 6, Cedar River Section 205 Levee System Improvement Locations show the locations of
each potential improvement area in detail. A summary of the proposed locations and description of
potential improvements are provided below:
TABLE 1. SUMMARY OF LEVEE IMPROVEMENT AREAS
Levee Stationing Description of Improvement
Right Bank
49+60 Improve Transition from Levee Embankment to Wall
63+65 to 64+35 Raise/Regrade Levee Embankment
66+55 to 67+25 Raise/Extend Existing Wall
Left Bank
19+20 Improve Transition from Levee Embankment to Wall
25+45 to 29+70 Raise Floodwall
29+70 to 34+10 Raise Levee Embankment with Curb Wall
55+70 to 56+90 Widen Levee Crest with Retaining Wall
58+10 + 58+50 Construct Floodwall
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Levee Stationing Description of Improvement
58+55 to 59+15 Reconstruct Damaged Floodwall
59+15 to 59+85 Raise/Regrade Levee Embankment
1.3. Reach Description
There are three bridges within the project reach, including (from upstream to downstream): Logan Avenue
Bridge, South Boeing Bridge and North Boeing Bridge. Renton Municipal Airport is located west of the left
bank of the lower river (below Logan Avenue), Boeing facilities and a public park (Cedar River Trail Park)
are located east of the right bank of the lower river, and other commercial, industrial and residential
developments are present above Logan Avenue.
Within the project reach, between river mile 0 and 1.23, the Cedar River is a constructed channel that
historically has required periodic maintenance and dredging of the bed elevation to ensure flood protection.
The river is channelized through the project reach and the banks are armored in numerous areas with
riprap, concrete, gabion baskets and/or wood retaining walls. Vegetation within the riparian zone along this
stretch of the Cedar River is comprised of a mix of: mature native trees and shrubs; recently planted native
trees, shrubs and herbaceous species that were installed as mitigation for the 2016 dredging; park
landscaping trees, shrubs and mowed grasses; unmaintained grass areas; and sections dominated by
invasive species. Native tree species located within the riparian zone include red alder (Alnus rubra), Pacific
willow (Salix lasiandra), Sitka willow (Salix sitchensis) and black cottonwood (Populus balsamifera ssp.
trichocarpa). Additional native shrubs and herbaceous species within the riparian zone include vine maple
(Acer circinatum), snowberry (Symphoricarpos albus), Nootka rose (Rosa nutkana), clustered wild rose
(Rosa pisocarpa), redosier dogwood (Cornus sericea), twinberry (Lonicera involucrate), Pacific ninebark
(Physocarpus capitatus), sword fern (Polystichum munitum), lady fern (Athyrium filix-femina) and scouring
rush (Equisetum hyemale). Many of these species were recently installed. Typical invasive species include
Japanese knotweed (Polygonum cuspidatum), reed canary grass (Phalaris arundinacea), Himalayan
blackberry (Rubus armeniacus) and Scotch broom (Cytisus scoparius).
2.0 DATA REVIEW
Wetlands and the ordinary high water mark (OHWM) of the Cedar River were previously delineated in
preparation for the 2016 maintenance dredging (GeoEngineers 2013). Wetland impacts during dredging
were mitigated in accordance with approved permits obtained from the United States Army Corps of
Engineers (USACE), Washington Department of Fish and Wildlife (WDFW), Washington State Department of
Ecology (Ecology) and City of Renton. A post-dredge wetland delineation was completed in accordance with
these permits and the post-dredge wetland conditions were documented (GeoEngineers 2017). A total of
seven wetlands were documented in the post-dredge condition, all of which are along the right bank of the
river.
Environmental maps of the project area available from public sources were also collected and reviewed.
The United States Fish and Wildlife Service (USFWS) National Wetlands Inventory (NWI) online mapper
(USFWS 2019) shows a freshwater riverine wetland mapped within the banks of the Cedar River itself. The
United States Department of Agriculture (USDA) Natural Resources Conservation Service (NRCS) Web Soil
Survey shows urban land, 0 to 5 percent slopes, in and adjacent to the project reach (USDA-NRCS 2019).
October 19, 2021| Page 3 File No. 0693-078-01
An NWI map from USFWS is included as Appendix A, National Wetland Inventory Map and soil survey map
from USDA-NRCS as Appendix B, Soil Survey Map.
The project reach is within the jurisdiction of the City of Renton’s Shoreline Management Program (SMP)
(RMC 4-3-090(B)(2)(a)). Critical areas within the shoreline jurisdiction are generally regulated under the
SMP rather than the Critical Areas Regulations, as referenced in the following sections. The shoreline
environment classification throughout the project reach is “high intensity” (City of Renton 2018).
Additional information was obtained from the Washington State Department of Natural Resources (DNR)
Forest Practices Application Review System (FPARS) and WDFW SalmonScape mapping application
(DNR 2019; WDFW 2019). Cedar River is a Shoreline of the State (DNR 2019: Washington Administrative
Code [WAC] 173-18-210). According to WDFW (2019), Cedar River supports fall Chinook Salmon
(Onchorynchus tshawytscha), Coho Salmon (O. kisutch), Sockeye Salmon (O. nerka), Bull Trout (Salvelinus
confluentus), resident Cutthroat Trout (O. clarkii) and winter Steelhead Trout (O. mykiss) throughout the
project reach.
3.0 FIELD INVESTIGATION
Two GeoEngineers’ wetland scientists conducted a field investigation on September 23, 2019, to
characterize and document habitat features at each proposed levee improvement area. A photographic
record was collected during the field visit to document existing site conditions and is provided in Appendix C,
Site Photographs.
3.1. Wetland Observations
We field-verified that none of the wetlands identified during the post-dredge wetland assessment
(GeoEngineers 2017) are located within the vicinity of the proposed improvement areas and that no new
wetlands had developed within the project reach.
3.2. Stream and Riparian Habitat
The OHWM is used to define the jurisdictional boundary of streams, Rivers and Shoreline Areas (RMC 4-3-
090(B)(3), WAC 222-16-031), for state Shoreline Management Act regulations (Revised Code of
Washington [RCW] 90.58.030(2)(c)), and federal Clean Water Act (CWA) regulations (USACE 2005).
GeoEngineers delineated the OHWM as part of the Cedar River Dredge Project (GeoEngineers 2013) which
covers the entire project area for the proposed levee improvements. As the river system within the project
reach has been historically channelized and heavily modified as a result of recurrent dredging, the OHWM
of the river has not changed since the prior survey work was completed, which was field-verified at each
proposed improvement location. The OHWM previously delineated and surveyed for the City of Renton is
therefore considered current and is depicted on Figures 2 through 6 accompanying this report.
According to RMC 4-3-050(L)(1)(a)(i), the Cedar River is considered a Class 1 stream because it is classified
as a Shoreline of the State. Class 1 streams are not subject to Renton’s Critical Areas Regulations but are
instead regulated under the SMP Regulations (RMC 4-3-050(B)(1)(j)(iii); RMC 4-3-090(D)(2)(c)(iii)). The
shoreline jurisdiction extends 200 feet from the OHWM, within which proposed uses and activities are
subject to the SMP (RMC 4-3-090(B)(3)(a)). Within this jurisdictional area, the standard vegetation
conservation buffer width is 100 feet from the OHWM (RMC 4-3-090(F)(1)(a)), within which vegetation
October 19, 2021| Page 4 File No. 0693-078-01
“shall be managed to provide the maximum ecological functions feasible” (RMC 4-3-090(F)(1)(i)). This
“vegetation conservation buffer” is shown on Figures 2 through 6.
A summary of each of the improvement locations and observations of habitat conditions within each
associated investigation area is provided in the sections below.
3.2.1. Right Bank, STA 49+60
This area is located to the south side of South Boeing bridge on the right bank of the Cedar River (Figure 2).
The proposed improvements involve improving the transition between the levee and floodwall. The existing
earthen levee consists of maintained lawn and is at slightly lower elevation than the floodwall. There is also
a utility vault at the connection between the levee and floodwall. Growing on the levee are two chestnut
(Castanea sp) trees that are approximately 25 to 30 feet towards the river. There are landscaped shrubs
waterward of the floodwall, including tall Oregon grape (Mahonia aquifolium). Photographs 1 and 2 provide
detail on site conditions at this location (Figure C-1).
3.2.2. Right Bank, STA 63+65 to 64+35
This area is located to the northwest of Logan Avenue on the right bank of the Cedar River (Figure 3). The
proposed improvements include raising the existing earthen levee and sidewalk to meet freeboard
requirements. This location is adjacent to a parking lot and an intersection of two sidewalks that are
associated with the Cedar River Trail Park and Logan Avenue. Native vegetation is generally absent in the
vicinity of the improvement location; vegetation consists of maintained lawn, an exotic maple (Acer sp),
landscaping shrubs near the road edge, and a rhododendron near the curb. Photographs 3 and 4 provide
detail on site conditions at this location (Figure C-2).
3.2.3. Right Bank, STA 66+55 to 67+25
This area is adjacent to a senior center along the right bank of the Cedar River (Figure 3). This is the only
location investigated that is outside of the 100-foot riparian conservation buffer based on the OHWM of the
Cedar River (but is within the 200-foot shoreline management zone). The proposed improvements in this
area include modifying the area in front of the senior center by adding a low wall and berm and regrading
as necessary to meet freeboard requirements. Currently there is a row of landscaped shrubs and a small
concrete pad for the building entrance within this area of the proposed improvements. A large locust
(Robinia sp.) tree is located to the southwest of the improvement area and may be impacted by activities,
although a goal of the design is to minimize impacts to the tree. There is a large area of shrub and tree
species located northwest (towards Logan Avenue), adjacent to the area of proposed improvements. This
vegetation is a mix of species consisting of rhododendron, barberry (Mahonia sp.), English ivy (Hedera
helix), yellow flag iris (Iris pseudacorus) and Himalayan blackberry. Depending on how the improved section
ties into existing high ground in this area, there could be additional impacts to this vegetation, which
includes native and invasive species. Photographs 5 and 6 provide details on site conditions at this location
(Figure C-3).
3.2.4. Left Bank, STA 19+20
The proposed improvements in this area are focused on repairing the transition from the existing levee wall
to the earthen berm along the left bank of the Cedar River (Figure 4). Native vegetation at the improvement
area consists of one young red alder (Alnus rubra) and a few field horse tail (Equisetum arvense) plants.
From the levee crest and wall to the river, vegetation is dominated by invasive species such as Scotch
October 19, 2021| Page 5 File No. 0693-078-01
broom and common tansy (Tanacetum vulgare). On the landward side of the levee crest, vegetation is
limited to mowed grass. Site photographs are provided on Figure C-4 on Photographs 7 and 8.
3.2.5. Left Bank, STA 25+45 to 29+70
The proposed improvements in this area include raising the existing floodwall by 0.1 to 0.6 feet by adding
a concrete cap on the existing wall (Figure 5). Vegetation on the river side of the levee is mixed in the vicinity
of the proposed improvement, with invasive species dominant, consisting of Himalayan blackberry, Scotch
broom, knotweed (Fallopia japonica) and common tansy. Native species present include snowberry
(Symphoricarpos albus) and field horse tail. Behind the floodwall, vegetation is limited, consisting of small
patches of maintained grasses. This area is otherwise paved for the access road, adjacent vehicle storage
areas and buildings (hangars). Site photographs are provided on Figure C-5 on Photographs 9 and 10.
3.2.6. Left Bank, STA 29+70 to 34+10
Proposed improvements in this location include raising the existing levee embankment by 0.1 to 0.6 feet
by adding a curb wall (Figure 5). As observed in the other locations, invasive species are dominant on the
river side of the levee, consisting of Himalayan blackberry, Scotch broom, knotweed, common tansy,
Japanese knotweed and Canada thistle (Cirsium arvense). Additional native species are present within this
area and consist of snowberry, willow species (Salix spp.), Nootka rose (Rosa nutkana), Oregon ash
(Fraxinus latifolia) and Pacific ninebark (Physocarpus capitatus). Behind the levee, there are limited
patches of maintained grasses and paved areas, including the airport access road. Site photographs are
provided on Figure C-6 on Photographs 11 and 12.
3.2.7. Left Bank, STA 55+70 to 56+90
This area is located on the north side of the Logan Avenue Bridge and will include modifications to the
existing earthen levee section to meet top width requirements (Figure 6). Proposed improvements include
the addition of a retaining wall to allow for widening the crest of the levee without encroaching on East
Perimeter Road. Riparian vegetation within this area directly downslope of the levee includes a large patch
of Japanese knotweed with Scotch broom to the north. There are two large cottonwood trees directly south
of the floodwall/levee transition growing within the top of the earthen berm, each approximately 20 inches
diameter at breast height (DBH). There is also a standing snag near the OHWM, downslope from the levee
crest. On the landward side of the floodwall and levee, there are limited patches of maintained grasses and
a public road providing access to the airport. Site photographs are provided on Figure C-7 on
Photographs 13 and 14.
3.2.8. Left Bank, STA 58+10 to 58+50
This area is on the south side of the Logan Avenue Bridge along the left bank of the river (Figure 6). The
proposed improvements include constructing a floodwall approximately 1.1 feet high adjacent to the
sidewalk to provide adequate freeboard above the base flood elevation. Sidewalk and roadway border this
improvement location, with limited amounts of landscaped vegetation consisting of non-native shrub
species. Photograph 15 illustrates the site conditions of the proposed improvements (Figure C-8).
3.2.9. Left Bank, STA 58+55 to 59+15
This area is on the south side of Logan Avenue Bridge along the left bank of the river (Figure 6). There is an
existing concrete wall that borders a planting strip and gravel parking lot that needs to be rebuilt due to
October 19, 2021| Page 6 File No. 0693-078-01
structural damage and raised in elevation. The vegetation that will likely be affected by improvements at
this location include landscaped shrubs and one medium-sized ash (Franxinus sp.) tree. Photographs 16
and 17 provide detail on site conditions at this location (Figures C-8 and C-9).
3.2.10. Left Bank, STA 59+15 to 59+85
This area consists of an earthen berm that is covered in maintained grass adjacent to the recreational trail
along the river (Figure 6, Photograph 18 on Figure C-9). The proposed improvements involve re-grading the
berm to a higher elevation. Manicured grass covers the berm at this location and extends into a larger open
lawn area associated with a riverside park. No other vegetation besides maintained grass would be
impacted by activities at this location.
4.0 CONCLUSIONS
This Critical Areas Assessment Report documents baseline conditions of regulated habitats and riparian
vegetation that may be impacted by the proposed Cedar River 205 Levee Certification Project within the
specific improvement locations. Proposed improvements will be restricted to upland areas based on the
OHWM previously delineated for this site, which was field-verified by GeoEngineers in September 2019.
However, the project is anticipated to impact some riparian vegetation within the Vegetation Conservation
Buffer specified in the City of Renton’s SMP.
Riparian vegetation adjacent to the proposed improvements are of limited value, consisting largely of
invasive species and mowed grass/lawn areas. Some native vegetation may also be impacted, which will
likely require mitigation to comply with the SMP, WDFW Hydraulic Project Approval requirements for
compliance with the WAC, and other federal and state regulations such as State Environmental Policy Act
(SEPA), National Environmental Policy Act (NEPA) and the Endangered Species Act. This report provides a
basis for identifying appropriate mitigation for project impacts, which will be identified and developed once
project designs and construction sequences are advanced to suitable levels for environmental permitting.
In general, the project is not anticipated to require wetland or waterbody impact or mitigation, other than
impacts to riparian vegetation. Conceptual mitigation for these temporary impacts is anticipated to be
achieved by replanting vegetated areas impacted during construction activities.
5.0 LIMITATIONS
GeoEngineers has prepared this Critical Areas Assessment Report in general accordance with the scope
and limitations of our proposal. Within the limitations of scope, schedule and budget, our services have
been executed in accordance with the generally accepted practices for wetland and stream delineation and
assessment in this area at the time this report was prepared. No warranty or other conditions, express or
implied, should be understood.
This report has been prepared for the exclusive use by Tetra Tech, Inc., the City of Renton, authorized agents
and regulatory agencies following the described methods and information available at the time of the work.
No other party may rely on the product of our services unless we agree in advance to such reliance in
writing. The information contained herein should not be applied for any purpose or project except the one
originally contemplated.
October 19, 2021| Page 7 File No. 0693-078-01
The applicant is advised to contact all appropriate regulatory agencies (local, state and federal) prior to
design or construction of any development to obtain necessary permits and approvals.
6.0 REFERENCES
City of Renton. Renton Municipal Code, Title 4-3-090 – Shoreline Master Program Regulations. Available
at: http://www.codepublishing.com/wa/renton/.
City of Renton. 2018. Draft Shoreline Master Program Updates. Available at https://edocs.rentonwa.gov/
Documents/1/edoc/1325425/SMP%20Draft%20Changes%2020181121%20Public%20Review%
20Draft.pdf.
GeoEngineers, Inc. (GeoEngineers). 2013. Habitat Assessment Revised Report: Wetlands and
Stream/Riparian Habitats, Cedar River Maintenance Dredge Project, Renton, Washington.
Prepared for Coast and Harbor Engineering. September 13, 2013. GEI File No. 0693-073-00
GeoEngineers, Inc. (GeoEngineers). 2017. Post-dredge Wetland Assessment, Cedar River Maintenance
Dredging Project, Renton, Washington. Prepared for the City of Renton. September 15, 2017. GEI
File No. 0693-073-03
Revised Code of Washington (RCW). Available at: https://apps.leg.wa.gov/rcw/default.aspx?cite=90.58
United States Army Corps of Engineers (USACE). 2005. Regulatory Guidance Letter 05-02: Expiration of
Geographic Jurisdictional Determinations of Waters of the United States. Available at:
https://www.nap.usace.army.mil/Portals/39/docs/regulatory/rgls/rgl05-02.pdf.
United States Department of Agriculture – National Resource Conservation Service (USDA-NRCS). 2019.
Web Soil Survey. Available at: http://websoilsurvey.nrcs.usda.gov/app/.
United States Fish and Wildlife Service (USFWS). 2019. Wetlands Mapper. Available at:
http://www.fws.gov/wetlands/ Data/mapper.html.
Washington Administrative Code (WAC). Available at: https://apps.leg.wa.gov/wac/default.aspx?cite=173-
18
Washington Department of Fish and Wildlife (WDFW). 2019. SalmonScape Application. Version 4.0.
Available at: http://wdfw.wa.gov/mapping/salmonscape/.
Washington State Department of Natural Resources (DNR). 2019. Forest Practices Application Review
System (FPARS) Mapping Application. Available at: https://fpamt.dnr.wa.gov/default.aspx.
FIGURES
500 0 500
Feet
Notes: 1. The locations of all features shown are approximate.2. This drawing is for information purposes. It is intendedto assist in showing features discussed in an attached document. GeoEngineers, Inc. cannot guarantee the accuracy and contentof electronic files. The master file is stored by GeoEngineers, Inc.and will serve as the official record of this communication.
Projection: NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet
Legend
Bank Stationing
Cedar River Levee Alignment
Ordinary High Water Mark (OHWM)
Vegetation Conservation Buffer
Identified Improvements
Improve transition from levee embankment to wall
Raise and extend existing wall
Raise levee embankment/Regrade
Floodwall/Retaining Wall
P:\0\0693078\GIS\MXD\069307801_F01_OverviewVMMap.mxd Date Exported: 10/11/21 by ccabrera Cedar
R
i
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FACTORYAVE
N
N 1ST ST
STEVENSAVE
N
WS 115TH PLBURNETTAVE
S
S 2ND ST85TH
AVESS 117TH PLGARDEN
AVE
N
S122NDSTS 120TH ST84TH
AVE
S
87THAVE
S
S TOBIN STRAINIERAVES
N AIRPORT WAY
SHATTUCK
AVES
88TH
AVE
SS 116TH STSTILLICUMST89THAVES
NW 7TH STN 6TH STS 118TH STWELLSAVESHOUS
ER
WAY
N
S 123RDST86TH
CTS
S123RDPLN MARION STMAIN
AVE
S
TAYLOR
AVE
NW N 2ND STN 3RD STN 4TH STN 5TH STS 117TH STFACTORY PL
N
S 121ST STWILLIAMSAVE
S
LIND
AVE
N
W
LOGAN
AVE
S
PELLYAVE
N
S 119TH STBUR
N
E
T
T
P
L
S
PARK
AVE
N
L
O
G
A
N
A
V
E
N
MEADO
W
AVE
N
NW6THSTWELLS
AVE
N
WILLIAMS
AVE
NBURNETTAVE
N
SL
A
T
E
R
S
T
S
RAINIERAVEN
N RIV
E
R
S
I
D
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D
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0+00
5+00
10+00
15+00
20+00
25+00
30+00
35+00
40+00
45+00
50+00 55+00 60+00
10+00
15+00
20+00
25+00
30+00
35+00
40+00
45+00
50+00
55+00
60+00 65+00
Data Source: 2019 image and streets from King County GIS. ESRI.Bank, stationing and improvements from Tetra Tech, August 2019.
Cedar River Section 205 Levee SystemImprovement Locations Overview and Vicinity Map
Cedar River 205 Levee Certification ProjectRenton, Washington
Figure 1
SITE
40 0 40
Feet
Notes: 1. The locations of all features shown are approximate.2. This drawing is for information purposes. It is intendedto assist in showing features discussed in an attached document. GeoEngineers, Inc. cannot guarantee the accuracy and contentof electronic files. The master file is stored by GeoEngineers, Inc.and will serve as the official record of this communication.
Projection: NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet
Legend
Bank Stationing
Cedar River Levee Alignment
Ordinary High Water Mark (OHWM)
Vegetation Conservation Buffer
Field Investigation Area
Improvement Area
P:\0\0693078\GIS\MXD\069307800_F02-6_ImprovementLocations.mxd Date Exported: 10/11/21 by ccabrera South Boeing BridgeCedar
R
i
v
e
r
Improve Transition fromLevee Embankment to Wall
40+00
50+00
EagleView Technologies, Inc.
Data Source: 2019 image and streets from King County GIS.Bank, stationing and improvements from Tetra Tech, August 2019.
Cedar River Section 205 Levee SystemImprovement Locations
Cedar River Section 205 Levee SystemRenton, Washington
Figure 2
50 0 50
Feet
Notes: 1. The locations of all features shown are approximate.2. This drawing is for information purposes. It is intendedto assist in showing features discussed in an attached document. GeoEngineers, Inc. cannot guarantee the accuracy and contentof electronic files. The master file is stored by GeoEngineers, Inc.and will serve as the official record of this communication.
Projection: NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet
Legend
Bank Stationing
Cedar River Levee Alignment
Ordinary High Water Mark (OHWM)
Vegetation Conservation Buffer
Field Investigation Area
Improvement Area
P:\0\0693078\GIS\MXD\069307800_F02-6_ImprovementLocations.mxd Date Exported: 10/11/21 by ccabrera Senior Center
Lo
g
a
n
A
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u
e
B
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i
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Cedar River
Raise/RegradeLevee Embankment
Widen Levee Crestwith Retaining Wall Construct Floodwall
Reconstruct Damaged Floodwall
Raise/RegradeLevee Embankment
Raise/ExtendExisting WallN 3RD STL
O
G
A
N
A
V
E
N
65+00
EagleView Technologies, Inc.
Data Source: 2019 image and streets from King County GIS.Bank, stationing and improvements from Tetra Tech, August 2019.
Cedar River Section 205 Levee SystemImprovement Locations
Cedar River Section 205 Levee SystemRenton, Washington
Figure 3
20 0 20
Feet
Notes: 1. The locations of all features shown are approximate.2. This drawing is for information purposes. It is intendedto assist in showing features discussed in an attached document. GeoEngineers, Inc. cannot guarantee the accuracy and contentof electronic files. The master file is stored by GeoEngineers, Inc.and will serve as the official record of this communication.
Projection: NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet
Legend
Bank Stationing
Cedar River Levee Alignment
Ordinary High Water Mark (OHWM)
Vegetation Conservation Buffer
Field Investigation Area
Improvement Area
P:\0\0693078\GIS\MXD\069307800_F02-6_ImprovementLocations.mxd Date Exported: 10/11/21 by ccabrera Cedar
R
i
v
e
r
Improve Transition fromLevee Embankment to Wall
20+00
EagleView Technologies, Inc.
Data Source: 2019 image and streets from King County GIS.Bank, stationing and improvements from Tetra Tech, August 2019.
Cedar River Section 205 Levee SystemImprovement Locations
Cedar River Section 205 Levee SystemRenton, Washington
Figure 4
80 0 80
Feet
Notes: 1. The locations of all features shown are approximate.2. This drawing is for information purposes. It is intendedto assist in showing features discussed in an attached document. GeoEngineers, Inc. cannot guarantee the accuracy and contentof electronic files. The master file is stored by GeoEngineers, Inc.and will serve as the official record of this communication.
Projection: NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet
Legend
Bank Stationing
Cedar River Levee Alignment
Ordinary High Water Mark (OHWM)
Vegetation Conservation Buffer
Field Investigation Area
Improvement Area
P:\0\0693078\GIS\MXD\069307800_F02-6_ImprovementLocations.mxd Date Exported: 10/11/21 by ccabrera Cedar
R
i
v
e
r
Raise Floodwall
Raise Levee Embankmentwith Curb Wall N 6TH STN RI
V
E
R
S
I
D
E
D
R
25+00
30+00
35+00
40+00
45+00
EagleView Technologies, Inc.
Data Source: 2019 image and streets from King County GIS.Bank, stationing and improvements from Tetra Tech, August 2019.
Cedar River Section 205 Levee SystemImprovement Locations
Cedar River Section 205 Levee SystemRenton, Washington
Figure 5
60 0 60
Feet
Notes: 1. The locations of all features shown are approximate.2. This drawing is for information purposes. It is intendedto assist in showing features discussed in an attached document. GeoEngineers, Inc. cannot guarantee the accuracy and contentof electronic files. The master file is stored by GeoEngineers, Inc.and will serve as the official record of this communication.
Projection: NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet
Legend
Bank Stationing
Cedar River Levee Alignment
Ordinary High Water Mark (OHWM)
Vegetation Conservation Buffer
Field Investigation Area
Improvement Area
P:\0\0693078\GIS\MXD\069307800_F02-6_ImprovementLocations.mxd Date Exported: 10/11/21 by ccabrera Senior Center
Lo
g
a
n
A
v
e
n
u
e
B
r
i
d
g
e
Cedar River
Raise/RegradeLevee Embankment
Widen Levee Crestwith Retaining Wall Construct Floodwall
Reconstruct Damaged Floodwall
Raise/RegradeLevee Embankment
Raise/ExtendExisting Wall
NAIRPORT WAYLOGAN
AVE
S
55+00
60+00
EagleView Technologies, Inc.
Data Source: 2019 image and streets from King County GIS.Bank, stationing and improvements from Tetra Tech, August 2019.
Cedar River Section 205 Levee SystemImprovement Locations
Cedar River Section 205 Levee SystemRenton, Washington
Figure 6
APPENDICES
APPENDIX A
National Wetland Inventory Map
Cedar River 205 Levee Improvement Project
U.S. Fish and Wildlife Service, National Standards and Support Team,wetlands_team@fws.gov
Wetlands
Estuarine and Marine Deepwater
Estuarine and Marine Wetland
Freshwater Emergent Wetland
Freshwater Forested/Shrub Wetland
Freshwater Pond
Lake
Other
Riverine
October 29, 2019
0 0.5 10.25 mi
0 0.8 1.60.4 km
1:2 9,134
This page was produced by the NWI mapperNational Wetlands Inventory (NWI)
This map is for general reference only. The US Fish and Wildlife Service is not responsible for the accuracy or currentness of the base data shown on this map. All wetlands related data should be used in accordance with the layer metadata found on the Wetlands Mapper web site.
APPENDIX B
Soil Survey Map
Soil Map—King County Area, Washington
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
10/29/2019
Page 1 of 35259200525940052596005259800526000052602005260400526060052608005261000526120052592005259400525960052598005260000526020052604005260600526080052610005261200558600558800559000559200559400559600559800560000
558600 558800 559000 559200 559400 559600 559800 560000
47° 30' 9'' N 122° 13' 23'' W47° 30' 9'' N122° 12' 4'' W47° 28' 58'' N
122° 13' 23'' W47° 28' 58'' N
122° 12' 4'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 10N WGS84
0 500 1000 2000 3000
Feet
0 150 300 600 900
Meters
Map Scale: 1:10,600 if printed on A portrait (8.5" x 11") sheet.
Soil Map may not be valid at this scale.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Map Unit Polygons
Soil Map Unit Lines
Soil Map Unit Points
Special Point Features
Blowout
Borrow Pit
Clay Spot
Closed Depression
Gravel Pit
Gravelly Spot
Landfill
Lava Flow
Marsh or swamp
Mine or Quarry
Miscellaneous Water
Perennial Water
Rock Outcrop
Saline Spot
Sandy Spot
Severely Eroded Spot
Sinkhole
Slide or Slip
Sodic Spot
Spoil Area
Stony Spot
Very Stony Spot
Wet Spot
Other
Special Line Features
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at
1:24,000.
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
line placement. The maps do not show the small areas of
contrasting soils that could have been shown at a more detailed
scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: King County Area, Washington
Survey Area Data: Version 15, Sep 16, 2019
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Jul 1, 2019—Jul 25,
2019
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
Soil Map—King County Area, Washington
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
10/29/2019
Page 2 of 3
Map Unit Legend
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
Ur Urban land 64.3 78.5%
W Water 16.9 20.7%
Totals for Area of Interest 81.8 100.0%
Soil Map—King County Area, Washington
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
10/29/2019
Page 3 of 3
APPENDIX C
Site Photographs
FigureC-1
Site Photographs
Photograph 1. Right Bank, STA 49+60, looking northeast.
Photograph 2. Right Bank, STA 49+60, looking southeast.
Cedar River 205 Levee Certification Project
Renton, Washington
000693-078-01 Date Exported: 10/28/19
FigureC-2
Site Photographs
Photograph 3. Right Bank, STA 63+65 to 64+35, looking
north
Photograph 4. Right Bank, STA 63+65 to 64+35, looking
south
Cedar River 205 Levee Certification Project
Renton, Washington
000693-078-01 Date Exported: 10/28/19
FigureC-3
Site Photographs
Photograph 5. Right Bank, STA 66+55 to 67+25, looking
east. Senior Center building shown.
Photograph 6. Right Bank, STA 66+55 to 67+25, looking
west. Senior Center building shown.
Cedar River 205 Levee Certification Project
Renton, Washington
000693-078-01 Date Exported: 10/28/19
FigureC-4
Site Photographs
Photograph 7. Left bank, STA 19+20, looking north.
Photograph 8. Left bank, STA 19+20, looking south.
Cedar River 205 Levee Certification Project
Renton, Washington
000693-078-01 Date Exported: 10/28/19
FigureC-5
Site Photographs
Photograph 9. Left Bank, STA 25+45 to 29+70, looking north.
Photograph 10. Left Bank, STA 25+45 to 29+70, looking south.
Cedar River 205 Levee Certification Project
Renton, Washington
000693-078-01 Date Exported: 10/28/19
FigureC-6
Site Photographs
Photograph 11. Left Bank, STA 29+70 to 34+10, looking north.
Photograph 12. Left Bank, STA 29+70 to 34+10, looking south.
Cedar River 205 Levee Certification Project
Renton, Washington
000693-078-01 Date Exported: 10/28/19
FigureC-7
Site Photographs
Photograph 13. Left Bank, STA 55+70 to 56+90, looking
north.
Photograph 14. Left Bank, STA 55+70 to 56+90, looking east.
Cedar River 205 Levee Certification Project
Renton, Washington
000693-078-01 Date Exported: 10/28/19
FigureC-8
Site Photographs
Photograph 15. Left Bank, STA 58+10 to 58+50, looking northeast.
Photograph 16. Left Bank, STA 58+55 to 59+15, looking west.
Cedar River 205 Levee Certification Project
Renton, Washington
000693-078-01 Date Exported: 10/28/19
FigureC-9
Site Photographs
Photograph 17. Left Bank, STA 58+55 to 59+15, looking southwest.
Photograph 18. Left Bank, STA 59+15 to 59+85, looking
south.
Cedar River 205 Levee Certification Project
Renton, Washington
000693-078-01 Date Exported: 10/28/19