HomeMy WebLinkAboutR2B Response to Comments_w_attachments_signedATTACHMENT 1 - TEMPORARY
CONSTRUCTION EASEMENT
Proposed temporary construction easement (Area 2) for access road and sewer line relocation
ATTACHMENT 2- AFFECTED CRITICAL
AREAS
.. a
<
X
; �== -=--�
� < >----------
�-� -�
___::
�-\LANDSLIDE H-��D
i _ _ _ SEISMIC HAZARD AREA 'i ----------------
:,----
.g 'E
'.:�o I----... ------------i LIMIT OF PROPOSED ! GRADING
1-
�
g
REVIEW COPY 15% CONCEPTUAL DESIGN NOT FOR CONSTRUCTION
LANDSLIDE
AREA
If SB405
I
If NB405 I
10 15 2 11 11 4 11 11 '" � 4 12 11 11 4 11 11 10 2 8
� � � � � � � � � � � �
RP GP GP ETL ETL RP RP ETL ETL GP GP RP t t j
EXISTING MAY CREEK BRIDGE
MAY CREEK------------�o=R=D=1N�A�R�Y-:.-----.H�IG�Hci=';W.'...A=T=ER..-----------------��--
PROPOSED SECTION A-A
0 25 50
SCALE IN FEET
gl...-_____________ _L_..:...:........:._:.......:...:���......:............:......-==..:.......:............:............:...... ________ � ______ ,-------,�--------r--------------"r"-� ; FILE NAME c::\users\ta lorsu
o. TIME 4:07:30 PM ATE 11115/2017 .. LOTIED BY taylorsu i DESIGNED BY
ENTERED BY
CHECKED BYPROJ.ENGR a. REGIONAL ADM. LENG
CONTRACT NO.
REVISION DATE BY
FED.AID PROJ.NO.
LOCATK>N NO.
XL4653
P.E. STAMP BOX
DATE
P.E. STAMP BOX
DATE
Washington State
Department of Transportation
1-405
RENTON TO BELLEVUE
PROJECT ST AGE 1
RENTON -CRITICAL AREAS
Pl.AN REF NO
SHEET
4
OF 5
SHEETS
ATTACHMENT 3 - TREE REMOVAL
AND RESTORATION PLAN
I-
4
0
5
R
E
N
T
O
N
T
O
B
E
L
L
E
V
U
E
,
S
TA
GE
1
M AY
C
R
E
E
K
A
N
D
V
I
C
I
N
I
T
Y
T
R
E
E
R
E
M
O
V
A
L
A
N
D
R
E
S
T
O
R
A
T
I
O
N
P
L
A
N
ATTACHMENT 4 - TCE RESTORATION
PLANTING PLAN
4
0
4
0
4
0
4
0
50
5
0
5
0
60
6
0
70
8
0
80
90
90
SCALE IN FEET
0 15 30
SCIENTIFIC NAME COMMON NAME QUANTITY
ENHANCEMENT PLANTING
STREAM BUFFER
DOUGLAS FIR
MOCK ORANGE
NOOTKA ROSE
THUJA PLICATA
PSEUDOTSUGA MENZIESII
TREES
SHRUBS
ACER CIRCINATUM
PHILADELPHUS LEWISII
GAULTHERIA SHALLON
ROSA NUTKANA
12'
12'
6'
3'
3'
3'
72
92
92
6
6
.065 ACRES
WESTERN RED CEDAR
SPACING
O.C
VINE MAPLE
SALAL
NOT FOR CONSTRUCTION
CONCEPTUAL
TEMP 1:1 CUT SLOPE
OR REINFORCED
TEMP CUT WALL
EX WATER LINE MAY CREEK
M A
Y
C
R
EE
K
TURN RADIUS
TEMP CONST. ACCESS
SB I-405
DRAFT
CBRENNAN
$
$
$
$
$
$
$
$
D
E
S
I
G
N
F
I
L
E
N
A
M
E
$
$
$
$
$
$
PLOTTED BY:
DATE:11/7/2017 TIME:4:12 PM
Washington State
Department of Transportation
MAY CRK BRIDGE - SW ACCESS RESTORATION PLANTING
LINE 2:
LINE 1:
SIZE
1 GAL.
4' HT. MIN.
2 GAL.
115
4-6' HT. MIN.
2 GAL.
4-6' HT. MIN.
1
-
24340
1
-24
3
4
1
ATTACHMENT 5 - UTILITY PLANS
PROPOSED TCE
Meadow Partners Ex sewer service
Notes
None
64
0
0 32
WGS _ 1984 _Web_ Mercatcir _Auxiliary_ Sphere
64 Feet
�tTffiifo
Finance & IT Division
Legend C,! City and County Boundary
Addresses
+ •
•
Parcels
Renton Fire Hydrant
Hydrant Other System
System Valve 8 Opened O Closed
Contra.I Valve
0 Wi=itF>r Fittinn
Information Technology -GIS
RentonMapSupport@Rentonwa.gov
2/20/2018
Cl 0
@
0
Domestic
Fire
Hydrant
Irrigation
Water Service Areas
Lift Station
Clean Outs
Manholes
Service Connections
This map is a user generated static output from an Internet mapping site and
is for reference only. Data layers that appear on this map may or may not be
accurate. current, or otherwise relrab!e
THIS MAP IS NOT TO BE USED FOR NAVIGATION
ATTACHMENT 6 - MAY CREEK
ENHANCEMENT PLAN
CONCEPT LEGEND
EXCAVATION FOR OVERBANK
;ABOVE OHWM
-.,..,-EX ANGULAR ROCK BELOW OHWM
-. . EX STREAM SCALEABLE EDGE
,-EX STREAM SCALEABLE EDGE
'"""'"·""'"""""'"
\_
m->!-.__EX ANGULAR ROCK BELOW OHWM
EXCAVATION FOR OVERBANK
ABOVE OHWM CJ PROPOSED FILL REMOVAUSTREAM GRADING
(INCLUDES UPLAND STREAM BANK
EXCAVATION, EX ANGULAR RIPRAP REMOVAL)
-------ii# CONCEPT PLAN HYDRAULIC CROSS
SECTION
PLAN LEGEND -·· EXISTING STREAM
:§ii: .>l.1.iL .>l.l.iL I WETLAND
· · · · · · · · · · · WETLAND BUFFER
• • • • • • STREAM BUFFER
--OHW-ORDINARY HIGH
WATER LINE
- CUT --CUT LINE
-FILL --FILL LINE
EXISTING CONTOUR
PROPOSED CONTOUR
I I I I I I
LEGEND NOTES
EXISTING ANGULAR ROCK BELOW OHWM SHALL BE REMOVED AS
DIRECTED IN THE FIELD BASED ON DRY SEASON WATER LEVEL
AND OTHER EXISTING CONDITIONS AS EVALUATED AT THE TIME OF CONSTRUCTION.
(, < ', I ,\
I I \ \ \
I
\ \ \ \ \ \ \ \ \ \ \
I ' ' ' '7.17'"/7'?.1'7'"/7'? PROPOSED RIGHT OF WAY
7.17'"/7'?.1'7'"/7'? EXISTING RIGHT OF WAY \ SB 1405 \
\ I
\ ' \ \ ' EXISTING EDGE
OF PAVEMENT '\ ' ' ' ' '
' \
I
I \ I I
EX MAY CREEK ,.. / /
I
/ /
STREAM EDGE, PER WSDOT
FIELD SURVEY,, OF EX STREAM
I \ I \ \
I I
/
I I
/ /
I
I
\ I I
I
I / I
/ /
X-SECS
\ \ \ \ \ \ \ I I I I I \
\ \ \ ' ' '
I . ':, •I
'\ \ \ '\ \ \ PROPOSED EDGE OF
PAVEMENT
' \ \ \ I
' ' ' '�', '--,�-�--PROPOSED SING.LE SPAN
PRESTRESSED CONC GIRDER
\ \
BRIDG1E
I I I \ I /
\ \ I I
I /
\ \ \ ,
..u C 0 ()
... ·c m
EXISTING WALL
-.��.�.��• PROPOSED WALL
/ / /
' ' I I
PROPOSED ROW I
CONCEPT PLAN HYDRAWLIC
\ CROSS SECTION
\ f "' ', en
\ f 1', f \
I f �
I I h--1'
\
'-. ' '
/ / /�EX 36"DIA SS
1 -( $1 f r r \
( I "' MAY CRK INTERCEPTOR '
-�1--------------------------------------------------------------------------------------------------·-.-_ MAY CREEK CONCEPT PLOTTED BY: LivingT i! -DATE: 10/6/2017 TIME: 5:55:19 PM ., � Washington State � 'f /1 Department of Transportation LINE 1: NO IN WATER WORK GENERAL CONCEPT
LINE 2:
•
0 25 50
SCALE IN FEET
NOTES
/ /
I
/
1) EXIST CONTOURS SHOWN ARE PER AERIAL TOPOGRAPHY (2015),
EXCEPT UNDER EXISTING MAY CREEK BRIDGE. CONTOURS UNDER
EXISTING BRIDGE ARE PER WSDOT FIELD SURVEY (2017). EXISTING
MAY CREEK STREAM CROSS SECTIONS WERE SURVEYED FOR
HYDRAULICS ANALYSIS PURPOSES, BUT DUE TO INCONSISTENCIES
IN AREAS BETWEEN GROUND SURVEY INFORMATION AND AERIAL
TOPOGRAPY DATA, THE EXISTING HYDRAULIC SECTIONS DATA IS
NOT SHOWN ON THE PLAN EXISTING CONTOURS, BUT THE
SURFACE LINE FROM THAT SURVEY IS DISPLAYED IN CROSS
SECTIONS AND USED AS THE ASSUMED SCALEABLE EDGE OF
STREAM. THIS DATA MORE ACCURATELY REFLECTS THE ACTUAL
STREAM BOTIOM ELEVATIONS AS COMPARED TO THE AERIAL
TOPOGRAPHIC SURVEY OF EXISTING GROUND SURFACE LINE.
CONCEPTUAL
NOT FOR CONSTRUCTION
'C 'C m .,,
i
U'J X
..
C :� ii : .?.
EX BRIDGE /
ABUTMENT/FOUNDATION�
' ,--..I.----r-, ' ''·-----------·
VARIES (5' MIN)
RELOCATED __/
12" 0.1.
WATER PIPE
(IF IMPACTED)
EX BRIDGE PIER AND FOUNDATION
REMOVED WHERE EXPOSED BY UPLAND
EXCAVATION TO A POINT 2-FT MIN.
DEPTH FROM PROPOSED GROUND LINE
SLOPE VARIES
(2H:1V MAX)
SEE NOTE 4
CONCEPTUAL
NOT FOR CONSTRUCTION
MAY CREEK REPRESENTATIVE SECTION
PROPOSED BRIDGE MINIMUM CLEAR SPAN
100 YR FLOOD PLAIN
REMOVE PORTIONS OF
ANGULAR ROCK RIP-RAP
WITHIN 100 YR
FLOOD PLAIN (TYP)
EX
ANGULAR
ROCK**
EX 36"RCP
KING CO. SS
MAY CK. INTERCEPTOR
(PROTECT IN PLACE)
EX
ANGULAR
ROCK**
.,,
N.T.S
''
S'MIN
---
NOTES:
1) SECTION IS REPRESENTATIVE OF PROPOSED CONCEPT FOR BRIDGE AND STREAM BANK
WORK . DIMENSIONS SHOWN REPRESENT THE MIN. OR MAX. BASED ON PERFORMANCE BASED
DESIGN GUIDELINES AND OTHER PROJECT RELATED COMMITMENTS, SUCH AS TO NOT
PRECLUDE AVAILABLE AREA WITHIN THE FUTURE BRIDGE SPAN LENGTH FOR FUTURE CITY
OF RENTON MAY CREEK REGIONAL TRAIL CONSTRUCTION.
2) CONCEPT ASSUMES REMOVAL OF EXISTING ANGULAR ROCK AND PROPOSED STREAM BANK
GRADING WILL RESULT IN NO NET RISE GREATER THAN 0.01-FT IN DESIGN WATER
SURFACE ELEVATION BETWEEN EXISTING AND PROPOSED CONDITIONS.
3) EXISTING BRIDGE SUB SURFACE FOOTING CONDITIONS VARY. SPREAD FOOTINGS, PILE
SUPPORTED FOOTINGS, AND DEEP SHAFT SUPPORTED FOOTINGS ARE ALL PRESENT AT THIS
BRIDGE LOCATION. FOOTING ELEVATIONS VARY. THE SECTION SHOWN REPRESENTS THE
SPREAD FOOTING LOCATION. THE PILE SUPPORTED FOOTING ON THE RIGHT (NORTH SIDE OF
CHANNEL) IS ALSO PROJECTED INTO THE SECTION TO SHOW WHERE SUB SURFACE
ELEMENTS ARE CLOSEST TO THE EXISTING GROUND SURFACE.
4) EXCAVATED SLOPES ABOVE OHWM SHOWN ON MAY CREEK REPRESENTATIVE SECTION
ABOVE ARE CONCEPTUAL. FINAL PROPOSED GRADE SLOPES WILL BE DETERMINED BY
DESIGN BUILD CONTRACTOR.
VARIES, MIN 16' ZONE FOR FUTURE TRAIL
FUTURE TRAIL
-------------------_;.-...---.... ....
PROPOSED ROADWAY
�EX GROUND
_ .... _____ ....
....
�EX BRIDGE
SLOPE VARIES
(2H:1V MAX)
SEE NOTE 4 ,-.... I ABUTMENTIFDUNDA noN
---------+
EX BRIDGE PIER AND FOUNDATION
REMOVED WHERE EXPOSED BY UPLAND
EXCAVATION TO A POINT 2-FT MIN.
DEPTH FROM PROPOSED GROUND LINE
EX PILE SUPPORTED FOOTING
(DOWNSTREAM FROM REPRESENTATIVE
SECTION)
OHWM SHOWN FOR INFORMATIONAL PURPOSES ONLY. OHW ELEVATION SHALL BE VERIFIED
BY A QUALIFIED BIOLOGIST PRIOR TO THE BEGINNING OF CONSTRUCTION.
EXISTING ANGULAR ROCK BELOW OHWM SHALL BE REMOVED AS DIRECTED IN THE FIELD
BASED ON DRY SEASON WATER LEVEL AND OTHER EXISTING CONDITIONS AS EVALUATED
AT THE TIME OF CONSTRUCTION.
�. MAY CREEK STREAM TYPICAL SECTION CONCEPT PLOTTED BY: LivingT
DATE: 10/6/2017 TIME: 6:08:34 PM :,: Washington State 'lfff/1 Department of Transportation LINE 1: REPRESENTATIVE TYPICAL STREAM SECTION -NO IN WATER WORK CONCEPT
LINE 2: .__ ________________________________________ ......_ _________________ .__ _____________________________________________________ __,
STREAM BUFFER ENHANCEMENT PLANTING
,/1
v"v",/1v"v",7 SCIENTIFIC NAM E CO MMO N NAME VVVVVVV· r-------------+-----------------1 "v"v"v"v"v"v"v AM ELANCHIER ALNIFO LI A ' WESTERN SERVIC EBERRY "v"v"v"v"v"v"v,-,J-_B_E_R _B_E_R -IS_A_Q_U_I _FO -LI_U _M_' __ +-T-A_L_L_O_R_E_G_O_N_G_RA
__ PE ------1
VVVVVVvr-------------+-----------------1 V V V V V V V BERBERIS NERVO SA 1 LOW OREGO N GR AP E v"v"v"v"v"v"v·v.1---C -O _R_Y_L _U _S _C _O _R_N_U _T _A _' ---+--WE--S-T _E _R _N _H _AZ_E -LN_U_T ___ _,
vvvvvvv
v" v"v" v" v" v"v" ,1--G-A _U _L_T_H _E_R_IA_S_H_A_L _O _N_' __ --+-_S _A _LA_L -----------1
vvvvvvv ,---------------+-------------� V V V V V V V HO LO DISC US DISCO LO R OCEANSPRA Y v:v:v:v:v:v:v:_,__P_O _L_Y_S_T_IC_H_U_M __ M_U_N_I_T_U _M_'_--+_WE_S_T_E_R_N_S_W_O _R_D_F_E_R_N __ __,
"v"v"v"v"v"v"vm--R-U_B_U_S _P_A_R_V_I_F -LO_R_U _S ---+--T-H -IM_B _L _E _B _E_R _R_Y _____ __,
VVVVVVVvr-------------+-----------------1
v"v"v"v"v"v"v" SYMPHORICARPO S ALBU S' SNOWBERRY
v"v"v"v"v"v"v" VA CCINIUM OVATUM' EV ERGR EEN HUCKLEBERRY
vvvv v v v,---------------+-------------� V V V V V V V LO NI CERA INVOLUCRA TA TWI NB ER RY VVVVVVVr-------------+-----------------1 V V V V V V V RO SA NU TKANA NO O TKA RO SE v:v:v:v:v:v:v:....+--R_U_B_U_S _S_P_E_C_T_A_B_I_L _IS-----+-S-A_L_M_O_N_B_E_R_R _Y _____ __,
vvvvvvv =-------------+-----------------1 V v"v" v" v" v"v". J--T _H _U _JA_P_L_I_C _A _T _A _____ +-WE __ S_T _E _R _N _R _E_D _C _E_D _A _R __ ----1
vvvvvvv CO s s c 2 "v"v"v"v"v"v"v· 1--__ R_N_U __ E_R_I _E_A ____ -+_R _E_D_-O_S_I_E_R _D_O_G_W_O_O_D __ ---1
v v v v v v v FRA XINU S LATIFO LI A 2 OREGO N ASH VVVVVVVl-----------------+-------------�
:v:v;v;v;v;v;v_,__P_H_Y_s_o_c _A_R_P_u_s_c_A_P _IT_A_T_u _s_+-_P_A_C_IF_I_C _N_IN_E _B_A _R_K ___ _____,
v v v v v v v SALIX SITC HENSIS2 SITKA WI LLOW
• To be installed in drier conditions. 2 To be installed in wetter conditions.
• Planting Design shall use species from this list and shall be selected based on specific site conditions.
,----.......
1--------
....... / --:------I ------------
./
; -:- '-4
// _, � ---.c::> ------.._ ..... ' ' . ---, -=-1--
L
... � : ' I
I
LEGEND
I .iii, .iii, .iii, .iii, .iii, WETL AND . .ui. >I.LI., .ui. .w. .w.
-----.. -------· WETL AND BO UND A RY • • • • • • • • • • • • • • • • • WETL AND BU FFER
STR EAM CENTER LINE
-OHW------
STR EAM BU FFER
ORDIN ARY HIGH WA TER MARK BO UND ARY
DITCH BO TTO M
PIP ED STREAM
-OR -FLOW DI RECTIO N
PROPERTY LINES
[v:v:v:v:v:v:v:v:v) BU FFER MITIGA TIO N
IMP ERVIO US SU RFA CEREMOVAL ED GE OF PAVEM ENT NEW
RETAINING WALL
STR E AMBED GRAVEL / AGGR EGATES; LWD
'' \ ' \ \ '
'\ I -
.
J
.
,
\ I'
\ �-----, \ '......_ I ----........ -,--
QUANTITY THIS SHEET
0.117 AC
STREAM BUFFER IMPACT -TEMP
FILE NAME c:\users\taylorsu\pw _ wsdotld0139111 \XL4653 _EB _M itigation_ 02_MayCreek.dgn TIME 11:28:51 AM DATE 10/10/2017 PLOTTED BY taylorsu DESIGNED BY J. LONG ENTERED BY S. TAYLOR CHECKED BY R. THOMAS PROJ.ENGR. REGIONAL ADM. L. ENG REVISION DATE
a.u, :E Q : l m VJ
u, Q l
m VJ
MAY CRK PROPOS ED GRADING
NO L
II H a. II a. H :E II :E :H : II H II z u. H 0 II u. 0 H u, II Q u, s:I' u Q ..!. l m VJ m z ----
c( C
FINISHED GRADE
/ /
-/ -� �'�" '"""
Q ..!. m z
___ S _T _R-EA_M_..,'1,1-IMPACT \__ STREAM BUFFER
BY
REGION STATE
NO. 10 WAS
JOB NUMBER
CONTRACT NO.
IMPACT -TEMP
FED.AID PROJ.NO.
LOCATION NO.
XL4653
P.E. STAMP BOX
I : u. u. 0
u, Q 1
P.E. STAMP BOX
I I ,_
WETL AND 7.2R / --I
I FU TURE TRAIL I
I I
/ /
( MAY CR EEK (EXJSTING ALIGNM ENT) --
'
) r--_.,,
I
\ \ \ \ \ \ \
682 SF
"'
I /
--/ / / / /
I I
/ / / I --
I <
\ __ .J /-_.,,,.
\ I r-
\
I I I
I \
) /
I
I
I
I
I
I
I
I
' "'
I -_......- ....... �
I J
./
( J
\--,.1
I I
I
I I
I
I
I
I
I
r
--1
\ \ \ I I I
I
\ I
I
I
I
I
I
I
\
o\
'
: /'-. I
-- I / '-..
I
) \' I }- _.. / "'
,1
I\ I I
' I : ' : ) I I
'I I
• I \ •
' �'
I', .. ' '
' .-'
: / \ I
'/ / � :, I I
' I ' r ': ,I \• >\ ,---\
I 2,7 14 SF\ I
/ I I
I
I
I
I
I
I
I
I
I I
: I .� •\ ,,
\ \ I
I
I \ \ \
\
I
'-, ', I I
\
I \
\
\ \ '
I
,_ '\
I
\
I
I
I
I
', I
\ I I I
I I
\ I \ I
\ I
I I
I \ \ I I \
I
'-...., "-.......
---/
I
I
I \
I ,-I
I
I I
'
I
I
I
/ I
I I
(
I
I J
/ /
I I
MAY CREEK
' \
1-405
\ ' ' \
: I •J I\ :1
: \ : I I 'I
: ))1
: ; : I I
I I , I I '1: ( \ :''J
_//: I J •, /
' I I I : / ' I I '/ / I�\:/
/ I . ,i \ , I g;' 1, \ I <C I , I en
( I / lLJ I I : I Z
I •i Q \ :1 ' •I I., '!
r ' I I / / --: ) �// 'I ' '---/
' 1-50 I� FEE';r
: : I
RENTON TO BELLEVUE
CORRIDOR WIDENING & EXPRESS TOLL SHEET
STREAM & CRITICAL AREA BUFFER
MITIGATION -MAY CREEK
2
OF 7
SHEETS
ATTACHMENT 7 - PROJECT NARRATIVE
1
Project Narrative – Updated for May Creek TCE
Project Name:
I-405, Renton to Bellevue Project, Stage 1
Size and Location of Site:
May Creek Bridge:
The site is located on I-405 over May Creek at MP 7.18. The existing bridge span is approximately
160 feet long.
Latitude: 47°31'42.25"N
Longitude: 122°11'52.20"W
Section Township Range: S32 T24N R5E
Lake Washington Trail:
The section of trail to be relocated is within 100 feet of the southbound lanes of I-405 parallel to Ripley
Lane and Seahawks Way; trail MP 7.35 to MP 10.25.
Latitude: 47°32'13.79"N
Longitude: 122°11'42.80"W
Section Township Range: S32 T24N R5E
Land Use Permits Required for Proposed Project:
Master Land Use Permit
Zoning Designation of the Site and Adjacent Properties:
East and west of I-405 – Resource Conservation (May Creek Bridge)
West of I-405 – Residential 8, Commercial Office Residential (Lake Washington Trail)
The May Creek project area is within the following Critical Areas in the City of Renton: Flood, Regulated
Slopes 15-<=90%, and Seismic Hazard.
The Eastside Rail Corridor is within an area of Regulated Slopes 15-<=90%.
Note that WSDOT has authority to design and construct state highways within WSDOT ROW. WSDOT
design manuals address steep slopes and seismic hazards, and WSDOT’s design will comply with the
substantive requirements of the City of Renton’s critical areas ordinance; however, permits are not
required within ROW.
Current use of the site and any existing improvements:
Much of the property in the May Creek project area is currently within WSDOT ROW. Improvements
support the roadway and associated roadway facilities necessary to provide a safe and efficient
transportation corridor. To every extent possible, roadway designers will maximize the use of existing
WSDOT ROW, but additional ROW may need to be purchased if deemed necessary. The proposed work
area is occupied by I-405 and completely surrounded by open land with deciduous forest dominated by
2
red alder. East of I-405 is vacant land owned by the City of Renton; west of I-405 Renton owns the north
bank of May Creek while the south bank is in private ownership.
Within the Eastside Rail Corridor project area, land use is primarily residential along the Lake Washington
shoreline west of the rail corridor, with some commercial and industrial development to the east
interspersed with undeveloped areas of native vegetation. This section of the Eastside Rail Corridor is
owned by King County.
Special site features (i.e., wetlands, water bodies, steep slopes):
The I-405 bridge crosses May Creek, an anadromous fish-bearing stream approximately 0.5 miles
upstream of its outlet into Lake Washington. Most or all work at the May Creek Bridge is within Renton
flood, regulated slopes (15-<=90%), and seismic hazard critical area designations.
Statement addressing soil type and drainage conditions:
Natural Resource Conservation Service (NRCS) soil maps show the vicinity of the May Creek Bridge to be
predominately Norma sandy loam, which is associated with floodplains and poorly-drained with
frequent ponding. Refer to Attachment 9 - Geology and Soils Technical Report
The shoreline area of Lake Washington is characterized by Seattle Muck consisting of mucky peat and
very poorly drained, while the area of the current bike path is within a unit of Alderwood gravelly sandy
loam, a moderately well-drained soil.
Proposed use of the property and scope of the proposed development:
May Creek Bridge (MP 7.18):
The Project will replace the northbound and southbound I-405 bridge structures over May Creek and
provide habitat improvements along the creek by removing angular rock fill material from the floodplain,
improving fish habitat along the stream channel, and providing buffer enhancement.
This activity is within the 100-year floodplain. Pier saw cutting and removal will occur adjacent to the
stream and quarry spall removal will occur within the ordinary high-water elevation of the stream.
Installation and removal of the piles will occur during the times authorized by the Hydraulic Project
Approval and the Federal Services Biological Opinion. The following outline describes a potential
construction sequence; however, since the project will use the design-build project delivery method,
construction sequencing and methods may vary.
NB Bridge Replacement Staging (SB Bridge Replacement Similar):
Construct construction access to bridge. For the south approach, construction access will be
constructed from west side of I-405. For the north approach, construction access can be
constructed from either side of I-405.
Install a debris catch system to the existing bridge girders from an Under Bridge Inspection Truck
(UBIT) or boom lift.
o Build a portion of the new northbound bridge east of the existing northbound bridge.
o Demolish the existing northbound bridge superstructure.
o Remove the existing ACP overlay, concrete barriers and utilities from the bridge deck.
3
o Remove the existing bridge deck.
o Add temporary bridge girder bracing and remove the existing bridge diaphragms.
o Remove the debris catch system.
Demolish the existing northbound bridge substructure (columns/abutments)
o Remove the existing northbound bridge columns. The WSDOT Design Build contractor will
perform a scour analysis to determine whether removal of existing columns to a depth of
2’ is sufficient to prevent exposure. An access route to the piers will be graded in on the
upslope side of the existing columns outside of the ordinary high-water level (OHWL). The
existing columns will be removed either by saw- cutting sections of the columns and/or by
jack-hammer and backfilled with previously excavated material.
o Remove the construction access and regrade impacted areas back to the pre-
constructed conditions.
o Remove existing abutments.
o Build the remaining portion of northbound bridge. The proposed bridge is a one span
structure, so no piers will be located within the limits of May Creek.
Equipment used on site may include, but is not limited to, back hoes, excavators, loaders,
graders, rollers, dump trucks, concrete trucks, vactors, mobile and stationary cranes, drilling
machines, pile drivers, and hand tools.
There may be concrete pours associated with bridge abutment and bridge deck construction.
Access to May Creek:
Access to May Creek for sewer line and riparian enhancement work will be through Area 2, a property
comprised of portions of King County tax parcels 3224059043 and 3224059081 abutting the west of I-
405, north of N 40th Street. WSDOT has designated the property as Parcel No. 1-24341 and has also
referred to the property as the Meadow Property.
The City will acquire Area 2 and grant WSDOT a temporary construction easement to build temporary
access to the southwest side of the new May Creek Bridge for construction. WSDOT will design,
permit, relocate, and connect the existing private sanitary sewer line serving the property owner (at
this time Meadow Partners, LLC) to maintain existing or better service. WSDOT will also restore the
Area 2 Tract to original or better condition with mitigation for temporary impacts to include replanting
and impact mitigation.
May Creek Trail:
An extension of the City’s May Creek Trail will be constructed on the north side of May Creek parallel to
the channel and above the 100-year floodplain. The trail will be eight feet wide and will extend from the
end of the existing May Creek Trail (which currently ends approximately 40 feet east of the eastern
boundary of the WSDOT right-of-way) to Jones Road. However, only the portion of the trail within
4
WSDOT right-of-way is being permitted as part of this application. The portions of the trail outside of
WSDOT right-of-way will be permitted separately and are not part of this application.
Lake Washington Trail:
The Project proposes to construct a bike and pedestrian trail within the Eastside Rail Corridor from Ripley
Lane in Renton to Coal Creek Parkway in Bellevue. Since King County bought the Eastside Rail Corridor,
this portion has been open to the public as a trail even with the rails intact. At this time, King County is
in the process of removing the existing rails and creating a gravel path on the existing railroad ballast
between Ripley Lane and Lake Washington Blvd where it turns towards Newcastle Beach Park.
For plats, indicate the proposed number, net density, and range of sizes (net lot area) of the new lots:
Not applicable to this project
Access:
May Creek Bridge (MP 7.18)
From I-405, take the Northeast 44th Street exit. Turn west and continue onto Lake Washington Blvd.
approximately 1,600 feet beyond the interchange. Park on the west side of the road adjacent to the rail
road tracks. The bridge may be accessed via the signed May Creek Trail on the east side of the road.
Lake Washington Trail
From I-405, take the Northeast 44th Street exit. Turn west onto NE 44th Street and then right onto
Seahawks Way and proceed north to where the road changes to Ripley Lane. The existing trail is to the
right (east); the Eastside Rail Corridor is to the west.
Proposed off-site improvements (i.e., installation of sidewalks, fire hydrants, sewer main, etc.:
Minor off-site improvements may include pavement markings, drainage improvements, permanent
signing, illumination, and barriers.
Total estimated construction cost and estimated fair market value of the proposed project:
Connecting Washington funded the Renton to Bellevue Stage 1 project as part of a larger set of
improvements. The total funding for the full set of improvements, including project engineering and
ROW, is $890M.
Estimated quantities and type of materials involved if any fill or excavation is proposed:
Since this is a design-build project, the exact excavation and fill quantities are not yet known.
Attachment 4 - Conceptual Site Plans shows the location of anticipated grading within shoreline and
critical areas designation.
Number, type, and size of any trees to be removed:
A board-certified landscape architect will prepare a roadside restoration plan and inventory of trees for
removal. Maps showing the location of proposed tree planting areas, and a list of replacement species
has been included in Attachment 5 – Tree Impacts and Restoration Plan.
Explanation of any land to be dedicated to the City:
Not applicable to this project.
5
Any proposed job shacks, sales trailers, and/or model homes:
Construction offices and staging areas will be within WSDOT ROW.
Any proposed modifications being requested (include written justification):
Not applicable to this project.
Distance in feet from the wetland or stream to the nearest area of work:
Lake Washington:
Approximately 100 feet from the developed shoreline.
May Creek:
Adjacent to and above the wetted perimeter of the channel.
Distance from closest area of work to the ordinary high-water mark:
May Creek:
The bridge work area will include piers within approximately 50 feet from the Ordinary High-Water Mark
(OHWM). The overhead bridge structure will be directly over the entire stream and directly adjacent to
the OHWM.
Lake Washington:
The new trail alignment will be approximately 100 feet from the developed shoreline of the lake at its
closest point.
Description of the nature of the existing shoreline:
May Creek:
Vegetation and habitat conditions on most of the WSDOT roadway property are limited because the
roadway currently supports a six- to 10-lane urban freeway and associated roadway facilities. River
banks up and downstream support a mixture of Douglas fir, big-leaf maple, red alder, black cottonwood,
and blackberry. Beneath the bridge, there is little vegetation and the banks are armored with riprap. For
additional detail, refer to Attachment 6 - Wetland and Stream Assessment Report.
Lake Washington:
The Lake Washington shoreline at this location is entirely developed into residential and commercial
properties, including a professional football practice field. Most of the properties have docks and/or
bank stabilization such as cement bulkheads. Lawns and ornamental vegetation comprise most of the
vegetation. Landward (east) of the homes is a buffer of trees and shrubs, then the rail corridor running
parallel to I-405, and parallel to that, Ripley Lane, a two-lane paved road. The Lake Washington bike trail
is between Ripley Lane and I-405. Total distance between the Eastside Rail Corridor and the bike lane
averages approximately 100 feet.