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RESIDENTIAL MIXED USE CENTERS INDUSTRIAL
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R -E (R-1) Residential 1 du/ac
R-4 (11-4) Residential 4 du/ac
R -a (R -g) Residential 0 du/ac
RMu (RMH) Residential Manufactured Homes
R-io(R-10) Residential 10 du/ac
R-14 (R-141 Residential 14 du/ac
RM -r- (RM -F) Residential Multi -Family
Rn -r (RM -T) Residential Multl-Family Traditional
FR 7w (RM -U) Residential Multi -family Urban Center
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-Nz (UC -N2) Urban Center - North 2
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COMMERCIAL
cEu (COR) Commerclal/Office/Residential
cA (CA) Commercial Arterlal
{:Ei (CO) Commerclal Office
cN (CN) Commercial Neighborhood
iH (IL) Industrial - Llght
iM {IM)'lndustrlal-Medium
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---- Renton City tdmita
Adjacent City limits
KROLL PAGE
PAGE# INDEX
SECT00" aANGE
CITY OF RENTON
DEPARTMENT OF COMMUNITY & ECONOMIC
DEVELOPMENT
MEMORANDUM
Date: December 20, 2011
To: City Clerk's Office
From: Stacy M Tucker
Subject: Land Use File Closeout
Please complete the following information to facilitate project closeout and Indexing by the City
ria�Lde nff!,-o
Project Name:
Lincoln Avenue Storm Project Critical Areas Exemption
LUA (file) Number:
LUA-11-055, CAR
Cross -References:
AKA's:
Project Manager:
Rocale Timmons
Acceptance Date:
July 19, 2011
Applicant:
City of Renton
Owner:
City of Renton
Contact:
Allen Quynn
PID Number:
3345700163; 3345700015; 3345700016
ERC Decision Date:
ERC Appeal Date:
Administrative Approval:
July 19, 2011
Appeal Period Ends:
July 19, 2011
Public Hearing Date:
Date Appealed to HEX:
By Whom:
HEX Decision:
Date:
Date Appealed to Council:
By Whom:
Council Decision:
Date:
Mylar Recording Number:
Project Description: Application requesting Critical Areas Exemption to repair and existing 18"
concrete culvert that failed during
a major storm event.
Location:
2011 NE 40th Street
Comments:
DEPARTMENT OF COMMUNITY
AND ECONOMIC DEVELOPMENT —� Q
PLANNING DIVISION
CERTIFICATE OF EXEMPTION
FROM CRITICAL AREAS REGULATIONS
EVALUATION FORM & DECISION
DATE OF PERMIT ISSUANCE: July 19, 2011
LAND USE ACTION FILE NO.: LUA011-055, CAR
PROJECT NAME: Lincoln Ave Storm Project Critical Areas Exemption
PROJECT MANAGER: Rocale Timmons, Associate Planner
OWNER/APPLICANT: City of Renton; 1055 S Grady Way, Renton, WA 98057
PROJECT LOCATION: 2011 NE 40th St
CRITICAL AREA: Stream and Wetlands
PROPOSAL DESCRIPTION: The proposal involves the repairing of an existing 18"
concrete culvert that failed during a major storm event. Portions of the culvert would be
replaced with corrugated polyethylene pipe and the remaining portions would be
rehabilitated. Minor excavation would be required in order to expose the outlet. The slope is
proposed to be stabilized with erosion control blankets and hydroseeded. No construction
would occur within the adjacent wetlands and would occur solely within the buffers.
Additionally, the applicant is requesting the replacement of an existing inlet structure within a
new manhole and birdcage trash rack.
EXEMPTION JUSTIFICATION: Pursuant to RMC 4-3-050C.5.e.ii. Roads, Parks, Public
and Private Utilities, of the Critical Areas Regulations is hereby granted:
RMC 4-3-050C. 5. e. ii. Existing Parks, Trails, Roads, Facilities, and Utilities — Maintenance,
Operation, Repair: Normal and routine maintenance, operation and repair of existing parks
and trails, streets, roads, rights-of-way and associated appurtenances, facilities and utilities
where no alteration or additional fill materials will be placed other than the minimum
X alteration and/or fill needed to restore those facilities to meet established safety standards.
The use of heavy construction equipment shall be limited to utilities and public agencies that
require this type of equipment for normal and routine maintenance and repair of existing
utility structures and rights-of-way. in every case, critical area and required buffer impacts
shall be minimized and disturbed areas shall be restored during and immediately after the
use of construction equipment.
City of Renton Department of Con ity & Economic Development Certificate of E. .tion from Critical Areas Regulations
Lincoln Ave Storm Project Critcal Areas Exemption LUA011-055, GAR
DATE OF PERMIT: July 18, 2011 Page 2 of 2
FINDINGS: The proposed development is consistent with the following findings pursuant to
RMC section 4-3-050C.5:
I. The activity is not prohibited by this or any other chapter of the RMC or state or federal
law or regulation.
2. The activity will be conducted using best management practices as specified by industry
standards or applicable Federal agencies or scientific principles if submitted plans are
followed and the conditions of approval of this exemption are met.
3. Impacts will be minimized and disturbed areas will be immediately restored, if
submitted plans are followed and the conditions of approval of this exemption are met.
4. Where wetland or buffer disturbance occurs during construction or other activities in
accordance with this exemption, the site will be revegetated with native vegetation as
required as a condition of approval for this exemption.
DECISION: An exemption from the critical areas regulations is approved.
DATE OF DECISION ON LAND USE ACTION:
SIGNATURE:
C.E. "Chip" Vincent, Planning Director
Planning Division
Date
APPEALS: Appeals of permit issuance must be filed with the City of Renton Hearing Examiner
by 5:00 p.m. on August 2, 2011. Appeals must be filed in writing, together with the required
fee to the City of Renton Hearing Examiner, City of Renton, 1055 South Grady Way, Renton, WA
98057. City of Renton Municipal Code Section 4-8-110 governs appeals to the Hearing
Examiner. Additional information regarding the appeal process may be obtained from the
Renton City Clerk's Office, (425) 430-6510.
RECONSIDERATION: Within 14 days of the decision date, any party may request that the
decision be reopened by the approval body. The approval body may modify his decision if
material evidence not readily discoverable prior to the original decision is found or if he finds
there was misrepresentation of fact. After review of the reconsideration request, if the
approval body finds sufficient evidence to amend the original decision, there will be no further
extension of the appeal period. Any person wishing to take further action must file a formal
appeal within the 14 -day appeal time frame.
EXPIRATION: Five (5) years from the date of decision (date of signature).
City of Renton
LAND USE PERMIT
MASTER APPLICATIO
PROPERTY OWNER(S)
NAME: See Attached List
ADDRESS:
CITY: ZIP:
TELEPHONE NUMBER:
APPLICANT (if other than owner)
NAME: Allen Qu nn
COMPANY (if applicable):
ADDRESS: 1055 S. Grady Way
CITY: Renton ZIP: 98057
TELEPHONE NUMBER: 425-430-7247
CONTACT PERSON
NAME: Allen QUynn
COMPANY (if applicable):
ADDRESS: 1055 S. Grady Way
CITY: Renton ZIP: 98057
TELEPHONE NUMBER AND EMAIL ADDRESS:
425430-7247, aquynn@rentonwa.gov
City of Renton
Planning Division
JUN 3 0 a)1
PROJECT INFORMATION
PROJECT OR DEVELOPMENT NAME:
Lincoln Ave. NE and Monterey PI. NE Storm System
Replacement Project
PROJECTIADDRESS(S)ILOCATION AND ZIP CODE:
4196 Lincoln Ave NE, Renton, WA 98056
2005 NE 40a' St., Renton, WA 98056
KING COUNTY ASSESSOR'S ACCOUNT NUMBER(S):
PID# 334570-0163, PID# 334570-0016, PID# 334570-0015,
City right of way
EXISTING LAND USE(S):
Single family residential, undeveloped forested slope
PROPOSED LAND USE(S): Unchanged
EXISTING COMPREHENSIVE PLAN MAP DESIGNATION:
Residential Medium Density (RMD), Residential Single
Family
PROPOSED COMPREHENSIVE PLAN MAP DESIGNATION
(if applicable)
EXISTING ZONING: Residential 10du per acre (R-10),
Residential 8du per acre (R-8)
PROPOSED ZONING (if applicable): N/A
SITE AREA (in square feet):
1300
SQUARE FOOTAGE OF PUBLIC ROADWAYS TO BE
DEDICATED: NIA
SQUARE FOOTAGE OF PRIVATE ACCESS EASEMENTS:
NIA
PROPOSED RESIDENTIAL DENSITY IN UNITS PER NET
ACRE (if applicable) NIA
NUMBER OF PROPOSED LOTS (if applicable) NIA
NUMBER OF NEW DWELLING UNITS (if applicable): NIA
C:1Documents and Settingslaquynn\Local Setting_sUemporary Internet FileslContent.Outlook\OlJ8DPP21master app.docx - l -
PKjJECT INFORMAT
NUMBER OF EXISTING DWELLING UNITS (if applicable):
NIA
SQUARE FOOTAGE OF PROPOSED RESIDENTIAL
BUILDINGS (if applicable): NIA
SQUARE FOOTAGE OF EXISTING RESIDENTIAL
BUILDINGS TO REMAIN (if applicable): NIA
SQUARE FOOTAGE OF PROPOSED NON-RESIDENTIAL
BUILDINGS (if applicable): NIA
SQUARE FOOTAGE OF EXISTING NON-RESIDENTIAL
BUILDINGS TO REMAIN (if applicable): NIA
NET FLOOR AREA ON NON-RESIDENTIAL BUILDINGS (if
applicable): NIA
NUMBER OF EMPLOYEES TO BE EMPLOYED BY THE NEW
PROJECT (if applicable): NIA
ION continued
PROJECT VALUE:
$40,000
IS THE SITE LOCATED IN ANY TYPE OF
ENVIRONMENTALLY CRITICAL AREA, PLEASE INCLUDE
SQUARE FOOTAGE (if applicable):
❑ AQUIFIER PROTECTION AREA ONE
❑ AQUIFIER PROTECTION AREA TWO
❑ FLOOD HAZARD AREA
sq. ft.
❑ GEOLOGIC HAZARD
sq. ft.
❑ HABITAT CONSERVATION
sq. ft.
❑ SHORELINE STREAMS $ LAKES
sq. ft.
❑ WETLANDS
sq. ft.
LEGAL DESCRIPTION OF PROPERTY
Attach legal description on separate sheet with the following information included
SITUATE IN THE NE QUARTER OF SECTION 32 , TOWNSHIP 24N, RANGE 5E , IN THE
CITY OF RENTON, KING COUNTY, WASHINGTON
AFFIDAVIT OF OWNERSHIP
I, (Print Namets) A 11,e , declare under penalty of perjury underthy laws of the State of
Washington that I am (please check one) the cudent owner of the property involved in this application or 1/ the authorized
representative to act for a corporation (please attach proof of authorization) and that the foregoing statements and answers herein
contained and the informaybn herewith are in all respects true and correct to the best of my knowledge and belief.
6 ff& /l'i - i
Signature of Owne
r/pre ntativ
STATE OF WAS )
) SS
COUNTY OF KING )
C 3v
Date
Signature of Owner/Representative
I certify that I know or have satisfactory evidence that r k1 - VV-' cy Q QV\ V'%_zT
signed this instrument and acknowledge it to be his/her/their free and voluntary for the
uses and purpose mentioned in the instrument.
Dated
Date
hh., OF vo-
Notary Public in and fgr'4he State of Washington
Notary(Print): _I.Avy4 Q �r— \A0S4w'0.V--)
My appointment expires: c) _l q _-
C:1Documents and SettingslaquynnTocal SettingsVI'cmporary Internet FileslContent.Outlook10I MPP2lmaster app.docx - 2 -
List of Property Owners
Name
Address
Phone Number
City of Renton
1055 S. Grady Way
425-430-7247
Renton, WA 98057
Fu Tien, Inc.
1007 S. Weller St.
425-922-8186
Seattle, WA 98104-3027
Joshua Phanco and
2005 NE 40th St.
206-947-0099
Megan Green
Renton, WA 98056
nto
REQUEST FOR CRITICAL p'annfngD�siOnn
AREAS'EXEMPTION JUN 3 0 �°"
(FOR SEPA EXEMPT ACTIVITIES) u uerl ar_i�lln
City of Renton Planning Division
1055 South Grady Way -Renton, WA 98057
Phone: 425-430-7200 Fax: 425-430-7231
Applicant Name
Project Name
Phone Number
City of Renton
Lincoln Ave NE and Monterey PI. NE Storm System Replacement Project
425430-7247
Parcel Number
Project Address
4196 Ave NE, Renton, WA 98056
PID# 334570-0163, PID# 334570-0016, PID# 334570-0015
2005 NE 40"' NE St., Renton, WA 98056
Brief Description of Project
The project consists of two elements. The first element involves repairing an existing 18" concrete culvert at Lincoln Ave NE and Monterey PI.
NE. The pipe outlet became damaged when the embankment on downstream side of the culvert failed during a major storm event.
Approximately 13' of the damaged portion of the 18" culvert outlet will be replaced with corrugated polyethylene pipe (CPEP) and the remaining
section of pipe will be rehabilitated using cured in place pipe technology. Cured in place pipe consists of inserting a flexible resin tube inside the
pipe and expanding it to conform to the inside walls. The tube is then heating to activate the curing process. Once the resin is cured the liner
becomes the carrier pipe and structurally replaces the concrete pipe. Minor excavation will be required to expose the outlet to connect the
CPEP to the existing pipe and install and cut the resin liner. The downstream embankment above the pipe will be backfilled and compacted to a
2:1 slope. The slope as well as all disturbed areas will be stabilized with erosion control blankets and hydroseeded. No construction work will
occur within the wetland.
The second element consists of replacing an existing rectangular metal inlet structure with a new Type 2, 54" manhole and birdcage trash rack.
The inlet intercepts flow from a small stream and discharges it to a 30" culvert that crosses Monterey Place NE. Because the inlet has a
horizontal flat grate, it's prone to clogging from debris that washes down the stream and covers the grate causing the stream to overtop the inlet
and flood the roadway and roadside ditches downstream. A new Type 2 manhole with birdcage trash rack will reduce the likely hood of debris
completely blocking the inlet and preventing stream flow from safely discharging into the culvert from the inlet. A short section of corrugated
polyethylene pipe (CPEP) will be placed upstream of the inlet to provide a smooth transition in grade between the steam channel and new inlet.
Approximately 9' of the stream channel will graded to transition from the pipe to the existing stream bed.
Type of Critical Area
StreamllNetland Stream and wetland buffer
® Work Occurs in Critical Area
® Work Occurs in Buffer
PURPOSE: Exempt activities provided with a letter of exemption from the Development Services
Administrator may intrude into a critical area or required buffer (Subject to any conditions or requirements
provided by the Administrator).
APPLICABILITY OF EXEMPTIONS: The following is a general list of activities that may be exempt from
the critical areas regulations. More specific descriptions of the activities are contained in the Critical
Areas Regulations. Some of the listed activities may not be exempt in certain critical areas. The Planning
Division will evaluate you request according to the City of Renton Critical Areas Regulations in RMC 4-3-
050C, J, L, and N.
I AM REQUESTING A CRITICAL AREAS EXEMPTION FOR ONE OR MORE OF THE FOLLOWING
ACTIVITIES:
❑ Conservation, Enhancement, and Related Activities:
• Conservation or preservation of soil, water, vegetation, fish, and other wildlife
• Enhancement activities as defined in chapter 4-11 RMC.'
-6-
H:Tile Sys1SWP - Surface Water ProjectslSWP-27 - Surface Water Projects (CIP)127-3578 Lincoln Ave NE and Monterey PI NE Storm System Replacement
ProjactlPermitslcritical areas exemption.doc
06109
• Any critical area, buffer restoration, or other mitigation activities that have been approved
by the City
❑ Research and Site Investigation:
Nondestructive education and research
• Site investigative work necessary for land use application submittals such as surveys, soil
logs, etc.
❑ Agricultural, Harvesting, and Vegetation Management:
• Harvesting wild foods
• Existing/Ongoing agricultural activities'
• Removal of dead, terminally diseased, damaged, or dangerous ground cover or hazardous
trees which have been certified as such by a forester, registered landscape architect, or
certified arborist
❑ Surface Water Alteration:
• New surface water discharges provided the discharge meets the requirements of the Storm
and Surface Water Drainage Regulations' 2 3
• New or modified regional stormwater facilities' 2 3
• Flood hazard reduction' 34 6
❑ Roads, Parks, Public and Private Utilities:
• Relocation of Existing Utilities out of Critical Area and Buffer
• Maintenance, operation, and repair of existing parks, trails, roads, facilities, and utilities' 2
• Installation, construction, replacement, or operation of utilities, traffic control, and walkways
within existing improved right -if -way or easement' 2
• Modification of existing utilities and streets by 10% or less' 2 5
• Mana9ement and essential tree removal for public or private utilities, roads and public
parks
❑ Wetland Disturbance, Modification, and Removal:
• Any activity in small Category 3 wetlands' 2 3 a 5
• Temporary disturbances of a wetland due to construction activities that do not include
permanent filling' 2 3 5
® Maintenance and Construction for Existing Uses and Facilities:
• Remodeling, replacing, or removing existing structures' 2
• Normal and routine maintenance and repair of any existing public or private uses and
facilities where no alteration of the critical area and required buffer or additional fill
materials will be placed' 2
• Construction activity connected with an existing single family residence or garage, provided
that no portion of the new work occurs closer to the critical area or required buffers than
the existing structure' 2
• Existing activities which have not been changed, expanded or altered provided they
comply with the applicable requirements of chapter 4-10 RMC'
- 7 - 06109
HAFile Sys1SWP - Surface Water ProjectslSWP-27 - Surface Water Projects (CIP)127-3578 Lincoln Ave NE and Monterey PI NE Storm System Replacement
ProjectkPermitslcritical areas exemption,doc
❑ Emergency Activities:
• Removal of trees or ground cover by a City department, agency, public, or private utility in
an emergency situation
• Public interest emergency use, storage, and handling of hazardous materials by
governmental organizations in an Aquifer Protection Area
ADDITIONAL PERMITS: Additional permits from other agencies may be required. It is the applicant's
responsibility to obtain these other approvals. Information regarding these other requirements may be
found at.http://apps.ecy.wa.gov/opas/
-B-
HAFile SysISWP - Surface Water Projects\SWP-27 - Surface Water Projects (CIP)V-3578 Lincoln Ave NE and Monterey PI NE Storm System Replacement
ProjectTennitstritical areas exemption.doc
06/09
I, the undersigned, declare under penalty of perjury under the laws of the State of Washington, that to
the best of my knowledge the above information is true and complete.
Applicant Signature: Date:
A. ijg,T illfl-T 1, T plilip;it , I L.�
11 :1
4111. j.. jif,Tr Y, ;1 1
00
�tl d,is l , 0 1 �! :s, l
wlE �11`
❑ Exemption Granted ❑ Exemption Denied
C.E. "Chip" Vincent, Planning Director
Planning Division
Signature: Date:
Conditions of Approval:
'Exemption does not apply in Aquifer Protection Areas
2 Exemption does not apply in Flood Hazard Areas
3 Exemption does not apply in Geologic Hazard Areas
4 Exemption does not apply in Habitat Conservation Areas
5Exemption does not apply in Streams and Lakes: Class 2 to 4
-9-
H:Tile SyMSWP - Surface Water Projects\SWP-27 - Surface Water Projects (CIP)\27.3578 Lincoln Ave NE and Monterey P1 NE Storm System Replacement
ProjectliPermits\critical areas exemption.doc
06109
BExemption does not apply in Wetlands
-10-
HARIe SystSWP - Surface Water ProjectslSWP-27 - Surface Water Projects (GIP)127-3578 Lincoln Ave NE and Monterey P1 NE Storm System Replacement
ProjectTerrnitstritical areas exemption.doc
06109
City of Renton.
Planning Division
Drainage Report
JUN 3 p ZU11
Background Ini JECE9 ED
This drainage report is being provided to comply with the submittal requirements for the critical areas
exemption application. Please see Exhibit I for the Technical Information Report Worksheet.
The goal of this project is to (1) repair damage to outlet of culvert across Lincoln Avenue NE and (2)
replace the existing culvert inlet structure for the unnamed stream with a type 2 structure with a
birdcage wire/trash rack and short piece of inlet pipe. All work will take place within the existing road
prism of Lincoln Avenue NE.
The project consists of two elements. The first element involves repairing an existing 18" concrete
culvert that conveys flow from manmade roadside ditches along the east side of Lincoln Avenue NE into
an unnamed stream to the west. All work in the first element of the project will take place outside of
the OHWM of the unnamed stream. The pipe outlet became damaged when the road embankment on
the downstream side of the culvert failed during a major storm event in December 2010. The
embankment failed as a result of concentrated runoff from heavy rains that saturated the slope of the
embankment causing it to fail above the culvert from the toe of the slope to the centerline of the road.
To reduce the potential for future damage to the culvert, Element 2 below will be implemented to
reduce the likely hood of concentrated flow from undermining the embankment above the culvert.
Approximately 13' of the damaged portion of the 18" culvert outlet will be replaced with corrugated
polyethylene pipe (CPEP) and the entire culvert will be lined with a cured in place resin liner. Cured in
place technology consists of inserting an environmentally safe flexible resin tube inside the pipe and
expanding it to conform to the inside walls. The tube is then heated using steam to activate the curing
process. Once the resin is cured the liner will become the carrier pipe and structurally replaces the
existing concrete pipe. Minor excavation will be required to expose the outlet to connect the CPEP to
the existing pipe and install and cut the resin liner. The downstream embankment above the pipe, part
of the existing road prism, will be backfilled and compacted to a 2:1 slope to restore the stability of the
road prism. The slope as well as all disturbed areas will be stabilized with erosion control blankets and
hydroseeded. No construction work will occur within the wetland or within the OHWM of the unnamed
stream. Approximately 30 cubic yards of fill will be placed above the pipe and 3 cubic yards of rip rap
will be placed at the outlet for energy dissipation. Approximately 3 cubic yards of material will be
removed from the road prism to expose the culvert for repair. During the anticipated time of
construction (late summer), the flows to the culvert should be very small; therefore, the contractor
should be able to temporarily store any water long enough to complete the repairs to the culvert. The
estimated time to install the damaged section of pipe and resin liner is one to two working day. Photos
of the culvert embankment and inlet structure can be found in Exhibit Al.
The second element consists of replacing an existing rectangular metal inlet structure with a new Type
2, 54" manhole and birdcage trash rack. The inlet intercepts flow from the small unnamed stream
located in the road prism and discharges it to a 30" culvert that crosses Monterey Place NE. Because the
inlet has a horizontal flat grate, it's prone to clogging from debris that washes down the stream and
covers the grate causing the stream to overtop the inlet and flood the roadway and roadside ditches
downstream. A new Type 2 manhole with birdcage trash rack will reduce the probability of debris
completely blocking the inlet and preventing stream flow from safely discharging into the culvert from
the inlet. A short section of corrugated polyethylene pipe (CPEP) will be placed upstream of the inlet to
provide a smooth transition in grade between the steam channel and new inlet. Approximately 6' of the
stream channel will graded to transition from the pipe to the existing stream bed. Approximately 17
cubic yards of material within the stream channel will be removed to install the new manhole, 30" inlet
pipe, rip rap and transition channel. Six cubic yards of quarry spalls will be used to stabilize the channel
and side slopes of the channel embankment. All grading and cut and fill will occur within the existing
road prism and the channel embankment as a maintenance activity of the existing roadway. Because
some flow in the stream is anticipated during construction, the contractor may need to install a sandbag
cofferdam upstream with a 6"-8" discharge pipe to temporarily bypass the stream into an adjacent
sanitary sewer manhole. The estimated time to complete the installation of the 30" inlet pipe, Type 2
structure and quarry spalls is one working day. Photos of inlet structure and stream channel can be
found in Exhibit A2.
Core Requirements
Core Requirement One — Discharge at a Natural Location
Both drainage areas will continue drain to their natural drainage paths after the project is complete.
Core Requirement Two — Downstream Analysis
Beginning at the existing inlet at Monterey PL NE, an unnamed stream flow enters a 30" corrugated
polyethylene pipe (CPEP) for approximately 200 feet before entering a Type 2 manhole. Flow continues
from the Type 2 manhole in a 36" CPEP for approximately 70' before discharging into a confined open
channel ravine adjacent to an apartment complex. The open channel continues for approximately 410'
before entering a Type 2 inlet manhole and 36" CPEP that crosses under an access driveway for
approximately 60 feet before discharging into another open channel. From this point the flow disperses
into small channels and enters a wetland. The stream re-channelizes and continues into a series of
pools before combining with the flow from the damaged 18" culvert across Lincoln Ave NE. After the
flows combine, the open channel continues for another 900' before entering a pipe system in SE 80th St.
There are no known flooding problems within the downstream segment described above.
Core Requirement Three — Flow Control
Flow control is not required for'this project under the Basin Exemption in Section 1.2.3 of the City
Amendments to the 2009 King County Surface Water Design Manual. Under the Basin Exemption, a
project is exempt from flow control if less than 2000 sf of new plus replaced impervious surface will be
created and less than 35,000 sf of new previous surface will be added. This project will add no new or
replaced impervious surface or new pervious surface.
Core Requirement Four- Conveyance System
See hydrologic and hydraulic analysis below.
Core Requirement Five — Erosion and Sediment Control
Erosion and sediment control will be in accordance with Appendix D of the 2009 KCSWDM. It is
anticipated that the contractor will install silt fence at the base of the culvert embankment during
construction. Erosion control blankets will be used to stabilize the slope of the embankment after
construction.
Core Requirement Six — Maintenance and Operations
Both facilities will be maintained by the City of Renton
Core Requirement Seven — Financial Guarantees and Liability
Both facilities will be maintained by the City of Renton
Core Requirement Eight —Water Quality
The project is exempt from water quality treatment under the surface Water Exemption in Section 1.2.8
of the KCSWDM since the project adds less than 5000 sf of new pollution generating impervious surface
and less than 35,000 sf of pollution generating pervious surface.
None of the special requirements are triggered by the project.
Hydrologic Analysis Upstream Tributary Area Characteristics
Existing 18" Culvert Across Lincoln Ave NE
The upstream tributary basin (shown as B1) for the existing 18" culvert is shown in Exhibit B. The
upstream basin is approximately 12.88 acres of forested hill side with an average slope of 11%. The
parcels within the basin boundary contain approximately 8 single family dwellings. Based on the Natural
Resources Conservation Service (NRCS) soil survey book, the primary soil types are 50% till soils (AgD
and AgC) and 50% outwash soils (RdE and EvC). Table 1 shows the breakdown in land use for till and
outwash soils.
Table 1
Till (6.44 ac)
Outwash (6.44 ac.)
Land Use
Area (Sq. Ft.)
Area (ac.)
Land Use
Area (Sq. Ft.)
Acres (ac.)
Roof
4,282
0.098
Roof
15,060
0.346
Gravel Rd
11,200
0.257
Gravel Rd
23,028
0.529
Grass
8,439
0.194
Pavement
9,704
0.223
Forest
256,388
5.886
Grass
6,357
0.146
Total:
6.435
Forest
226,512
5.200
Total:
226,512
6.443
The hydrologic analysis utilizes the King County Runoff Time Series KCRTS) Model with 15 min time
steps. To determine existing condition 25 -yr and 100 -yr peak flows, the land use values were entered
into the KCRTS model. Developed condition flows were also determined using a current zoning
designation of R-10 which assumes 75% maximum impervious coverage. Exhibit C summarizes the
input�values for KCRTS.
Exhibits D and E summarize the flow frequency analysis for existing and developed peak discharges
respectively. For existing conditions, the peak 25 -yr and 100 -yr flows are 1.83 cfs and 2.41 cfs. For
developed conditions, the 25 -yr and 100 -yr peak flows are 12.10 and 14.15 cfs. To account for storage
routing, flow path adjustments were used and summarized in Exhibit C
Existing Inlet at Monterey _PL NE
The basin tributary to the existing inlet to be replaced is labeled as B2 in Exhibit B. The basin is
approximately 80 acres of various land uses including relatively new single family residential plats, older
single family homes on large lots and forested hill side. To provide the most conservative discharge
estimate, future land use conditions were assumed and based on the hydrologic analysis from the
Stormwater Technical Information Report for the Seahawks Headquarters -and Training Facility produced
by Magnusson Klemencic and Associates and the referenced Preliminary Hydraulics Report prepared by
WSDOT for the north Renton basin. Basin B2 is a subasin within the basin designated DA 757. To
approximate the peak 25 -yr and 100 -yr discharges, the area of Basin B2 as a percentage of DA 757 was
determined and applied to the 25 -yr and 100 -yr peak flow for DA 757. The total area, land use areas
and peak discharges can be found in Exhibit F -Event Summary. Peak flows in the Preliminary
Hydraulics Report are based on the Santa Barbara Unit Hydrograph method. The drainage area for DA
757 is 181 acres. Drainage basin B2, which is 80 acres, represents 44916 of DA 757. Applying this
percentage to the calculated 25 -yr and 100 -yr peak flows for DA 757 of 55.18 cfs and 67.6 cfs, yields an
adjusted developed 25 -yr and 100 -yr peak flows of 24.3 cfs and 29.7 cfs for basin B2.
Hydraulic Analysis
Existine 18" Culvert Across Lincoln Ave NE
To determine if the existing 18" culvert has sufficient capacity to convey the tributary flows, the King
County Backwater Model was utilized for a range of flows to determine at what flow rate overtopping of
the roadway would occur. The backwater output summary can be found in Exhibit G. In accordance
with the culvert design criteria in Section 1.2.4.1 and Section 4.3.1 of the 2009 King County Surface
Water Design Manual (KCSWDM), culverts must have sufficient capacity to meet the headwater
requirements and convey the 25 -yr peak flow with a minimum of 6" of freeboard assuming existing
conditions for offsite tributary areas. For 18" culverts, the headwater to depth ratio (HW/D) must not
exceed 2.0. Because the culvert will incorporate a liner, the culvert model assumed a reduction of the
pipe diameter of 2 inches. Thus, the culvert was, modeled as a 16" diameter culvert. Based the culvert
model output (Exhibit F) with a developed 25 -yr peak flow of 12.10 cfs, the headwater elevation above
the inlet is 73.88. The top of the road embankment along the shoulder is at elevation approximately
75.50 which leaves 1.62 feet of freeboard and therefore meets the 6" freeboard criteria. To satisfy
HW/D criteria of 2.0, the headwater elevation cannot exceed 73.13. The headwater elevation of 73.88
exceeds HW/D criteria by 0.75 feet for developed condition flows only. Using the existing condition 25-
yr discharge of 1.83 cfs yields a headwater elevation of 72.25 or 0.88 feet below the maximum allowable
elevation of 73.13.
Based on the analysis above, the lined 18" culvert will have sufficient hydraulic capacity to satisfy the
design requirements in the City adopted 2009 KCSWDM.
Existing Inlet at Monterey PL NE
The proposed inlet will be connected to a 30" corrugated polyethylene pipe. Because steepness of pipe
slope (7.5'0), the capacity of the pipe is determined by the pipe inlet (inlet control) using the nomograph
for headwater depth for smooth interior pipe culvert (Fig. 4.3.1.B) which can be found in Chapter 4 of
the 2009 KCSWDM. Exhibit -H is a copy of the nomograph which shows the calculated headwater to
depth ratio (HW/D) represented by the line labeled "25 -yr flow". The headwater depth ratio is
determined by the intersection of the each line with the headwater depth scale 1. For the 25 -yr flow
line, HW/D is equal to 1.04 which is equivalent to a headwater elevation of 111.44. The elevation of the
.crow of the road is elevation 116.00; therefore, the pipe has adequate capacity to convey the 25 -yr
storm with more than 6" of freeboard In accordance with Section 1.2.4.1. The HW/D criteria is also
satisfied as the calculated HW/D of 1.04 is less than the maximum HW/D of 2.0 specified in Section
4.3.1.1.
Conclusion
Based on the hydrologic and hydraulic analysis above, the proposed repair of the existing 18" culvert
across Lincolns Ave. NE and the replacement of the existing inlet at Monterey PL NE satisfy the design
requirements of the City adopted 2009 KCSWDM.
View of 18" culvert embankment under repair on downstream side of Lincoln Ave NE
View of buried 18" culvert outlet on downstream side of Lincoln Ave NE
Exhibit Al
View of existing inlet to be replaced along Monterey PL NE
View of stream along Monterey PL NE upstream of existing inlet above
Exhibit A2
Length
Slope
Lincoln Ave NE and Monterey PI NE Storm System Improvement Project
KCRTS Land Use Parameters
Site Area: 12.88 ac. Existing Conditions
Flow Path Adjustments:
Till Grass Impervious
144 480
0.078 0.19
Zoning: R-10 (75% impervious)
Till Soils (6.44 acres)
Land Use Acres
impervious 4.83 -
grass 1.61
Flow Path Adjustments:
Till Grass Outwash impervious
Length 5o 50 100
slope 0.11 0.11 0.11
Till Soils (6.44 acres)
Land Use
Land Use
Square Ft Acres
Roof
Roof
4,282
0.098
Gravel Rd
11,200
0.257
Grass
8,439
0.194
Forest
256,388
5.886
Total:
5.200
6.435
Flow Path Adjustments:
Till Grass Impervious
144 480
0.078 0.19
Zoning: R-10 (75% impervious)
Till Soils (6.44 acres)
Land Use Acres
impervious 4.83 -
grass 1.61
Flow Path Adjustments:
Till Grass Outwash impervious
Length 5o 50 100
slope 0.11 0.11 0.11
Full Buildout Conditions
Outwash Soils (6.44 acres)
Land Use Acres
4.83
1.61
Exhibit C
Outwash Soils (6.44 acres)
Land Use
Square Ft
Acres
Roof
15,060
0.346
Gravel Rd
23,028
0.529
Pavement
9,704
0.223
Grass
6,357
0.146
Forest
226,512
5.200
Total:
6.443
Full Buildout Conditions
Outwash Soils (6.44 acres)
Land Use Acres
4.83
1.61
Exhibit C
Exhibit D
Lincoln
out.pks.txt
Flow Frequency Analysis
Time Series
File.lincoln
time series.tsf
Project
Location:Sea-Tac
---Annual Peak
Flow Rates----
-----Flow
Frequency
Analysis -------
Flow Rate Rank
Time of
Peak - -
Peaks -
Rank Return
Prob
(CFS)
(CFS)
Period
0.921
5
2/09/01
12:30
2.41.
1
100.00
0.990
0.701
7
1/06/02
1:00
1.83
2
25.00
0.960
1.83
2
12/08/02
17:15
1.07
3
10.00
0.900
0.648
8
8/26/04
1:00
0.945
4
5.00
0.800
0.919
6
10/28/04
16:00
0.921
5
3.00
0.667
0.945
4
10/22/05
10:00
0.919
6
2.00
0.500
1.07
3
10/25/06
22:45
0.701
7
1.30
0.231
2.41
1
1/09/08
6:30
0.648
8
1.10
0.091
Computed
Peaks
2.22
50.00
0.980
Exhibit D
Exhibit E
fullbuildout.pks
Flow Frequency Analysis
Time Series
File:full
build.tsf
Project
Location:sea-Tac
----Annual
Peak
Flow Rates---
-----Flow Frequency
Analysis --------
Flow Rate
Rank
Time of
Peak
- - Peaks - -
Rank Return
Prob
(CFS)
(CFS)
Period
6.94
4
8/27/01
18:00
14.15
1
100.00
0.990
4.51
8
1/06/02
1:00
12.10
2
25.00
0.960
12.10
2
12/08/02
17:15.
7.15
3
10.00
0.900
4.78
7
8/25/04
23:45
6.94
4
5.00
0.800
6.94
5
10/28/04
16:00
6.94
5
3.00
0.667
7.15
3
10/22/05
10:00
6.92
6
2.00
0.500
6.92
6
10/25/06
22:45
4.78
7
1.30
0.231
14.15
1
1/09/08
6:30
4.51
8
1.10
0.091
Computed
Peaks
13.47
50.00
0.980
Exhibit E
Preliminary Hydraulic Report — North Renton
Calculations
Appended on: 15:46:31 Thursday, September 23, 2004
ko"..f."I"
DA 757 Event Summary
ftMethod; Rafe e
)]
3,73..0...7.......' .3.98117I��q�[sBUH
-FE...I...A...
2 yr 20.8309 -8:50 14-9060 11181..4500
5 yrs
31.5204 ...... ....... 8:50 21.2538. ]51.4500 SBUH TYPEIA-
10 yr :43.0262
9.0262 8.17 27.9001 181.4500 SBUH IA
25 yr .1
55.1838
8.17 34.7463 181.4500 SBUH TYPE IA
Residential districts - 1/8 acre town houses 75.65 ac 90.00
67.6240
8.17 41.7349 ":1181.4500.F—SBfJH TYPEIA
Record Id: DA 757
DesIgn. Method SBUH —1Rainfall type TYPEIA
..10',00 min fPeaking Factor 484.00
:Abstraction Coeff
:JPervious Area F 181.45 ac.,,,:DCIA ..9.00 ac
............
LPervious CN 88.33 DC CN 0.00
Pervious TC -1_..56.36 min DC TC 0.00 min
Pervious CN Cale
Description SubArea Sub rn
F
Colm.m.e.r.cial-& Business 19.08 ac 94.00
Residential districts - 1/5 acre 84.75
spaces, lwwnsiparks. (<50% grass) ;1.....16-89 ac
Residential districts - 1/8 acre town houses 75.65 ac 90.00
-open spaces, lawns,parks (>75% grass) 50.43 ac iF86.04
Pervious Composited CN (AMC 2) 88.33
. ..........
Pervious TC Cale
Type Description ... ......... } Length Slope I..nsc
underbrush
1: Sheet]Woods, 1 00 ini
40.52 min.
%'Shallow gutter
�70Of�. 9-DLt�
Channel jChannel ....ra.v.ine
.............,.......
Ic :r
min
Fag' 2a',
Exhibit F
BACKWATER PROGRAM FOR ROUND/ARCH CULVERTS
TOTAL "HW" VS."Q" DATA PRINT-OUT
Q(CFS) HW(FT) HW-ELEV(FT)
Exhibit
Tailwater
Elevation:62,
feet
Discharge
Range:l.
to 20.
Step of
1.
[cfs)
Overflow
Elevation:75.
feet
Broad
Crested
Weir: Length:50.
feet,
Height:0.6
feet
Upstream
Velocity:l.
feet/sec
CULV NO.
1: 86
LF - 16"CP
@ 10.16% OUTLET:
61.39
INLET:
70.13
INTYP: 5
Q(CFS)
HW(FT)
HW ELEV. *
N -EAC
DC
DN
TW
DO
DE
HWO
HWI
*************************************************************************
******
1:00
0.45
70.58 *
0.012
0.39
0.18
0.61
0.61
0.39
*****
0.45
2.00'
0.70
70.83 *
0.012
0.56
0.25
0.61
0.61
0.56
*****
0.70
3.00
0.92
71.05 *
0.012
0.69
0.31
0.61
0.61
0.69
*****
0.92
4.00
1.12
71.25 *
0.012
0.80
0.36
0.61
0.61
0.80
*****
1.12
5.00
1.33
71.46 *
0.012
0.90
0.40
0.61.
0.61
0.90
*****
1.33
6.00
1.54
71.67 *
0.012
0.98
0.44
0.61
0.61
0.98
*****
1.54
7.00
1.81
71.9.9 *
0.012
1.06
0.47
0.61
0.61
1.06
*****
1.81
-
8.00
2.12
72.25-*
0.012
1.12
0.51
0.61
0.61
1.12
*****
2.12
9.00
2.46
72.59 *
0.012
1.18
0.54
0.61
0.61
1.18
*****
2.46
10.00
2.85
72.98 *
0.012
1.22
0.57
0.61
0.61
1.22
*****
2.85
11.00
3.28
73.41 *
0.012
1.25
0.60
0.61
0.61
1.25
*****
(«lyr5
3.2 8
,0D3.75
73.88*
0.012
1.27
0.63
0.61
0.63
1.27
*****
f 1. /d r�
3.75
13.00
4.26
74.39 *
0.012
1.29
0.66
0.61
0.66
1.29
*****
fcct2Ts
4.26
too- yr F�.lr ,,;IJ�aT 14.00
4.81
74.,,94 *
0.012_1,30
_0.69
0.61
0.69
1.30
*****
1.15 �1=s
4.81
****************
OVERFLOW ENCOUNTERED
AT
15.00
CFS DISCHARGE
*****************
15.00
4.87
75.00 *
0.012
1.31
0.72
0.61
0.72
1.31
*****
5.40
TOTAL "HW" VS."Q" DATA PRINT-OUT
Q(CFS) HW(FT) HW-ELEV(FT)
Exhibit
5f.0 q,a.I. i
1.00
0.44
70.57
2.00
0.70
70.83
3.00
0.91
71.04
4.00
1.12
71.25
5.00
1.33
71.46
6.00
1.54
71.67
7.00
1.81
71.94
8.00
2.12
72.25
9.00
2.46
72.59
10.00
2.85
72.98
11.00
3.28
73.41
12.00
3.75
73.88
13.00
4.26
74.39
14.00
4.81
74.94
**************** OVERFLOW ENCOUNTERED
AT 15.00 CFS DISCHARGE
********** THE FOLLOWING DATA
INCLUDES
CULVERT FLOW PLUS WEIR FLOW
***********
15.00
4.87
75.00
16.00
4.98
75.11.
17.00
5.01
75.14
18.00
5.04
75.17
19.00
5.06
75.19
20.00
5.08
75.21
5f.0 q,a.I. i
4,3,1 L.ULVERTS—METHODSOFANALYSIS
FIGURE 4.3.1.11
HEADWATER DEPTH FOR SMOOTH INTERIOR PIPE CULVERTS WITH INLET CONTROL
12
ENTRANCE TYPE
SQUARE- EDGE WITH
HEADWALL
rr
IIS
PLAN 1�
GROOVE END WITH
HEADWALL
.rr
I I �
I
6PLAN (2)
GROOVE END
PROJECTING
1�
2009 Surface Water Design Manual 1/9/2009
Exhibit H
1a0
1o,DaD
(1)
(2)
(3)
10
1613
6,000
EXAMPLE
s.
.7
•
7
156
24
6,000
D - 42 Inches (3,0 feet).
6.
5.
Q e 120 cfs
5,000
21
5 horizontally to scale (1)• then
144
6.
5.
4,000
Br HW
.8
6
3 Illustrated.
132
D (feet)
5'
4.
2
3,000
(1) 2.5 8.8
15
4.
720
.5
5
.5
1.0
2,000
(a) 2.2 7.7
4'
3.
108
3.
'D In fact
96
1,000
3.
800
84800
2'
2-
500
2
72
400
o
z
300
E
/
1.5
1.5
?
/
60
LL
200
1.5
Z
z
/
Ig
54
/
a
d,
/w
48
080
z
V
60
r
116
1.0
7.D
U.
4z
A
50 HW ENTRANCE_
1.0
40
SCALE
D
tY
��,TYPE"_
9
W
38
30
��}� �- Square edge with
a
9
.9
33
` r T
5�(21
headwall
O
20
Groove and with
O
��
-30
headwall
•8
.8
(3) Groove and
.13
projecting
12
ENTRANCE TYPE
SQUARE- EDGE WITH
HEADWALL
rr
IIS
PLAN 1�
GROOVE END WITH
HEADWALL
.rr
I I �
I
6PLAN (2)
GROOVE END
PROJECTING
1�
2009 Surface Water Design Manual 1/9/2009
Exhibit H
27
10
7
.7
•
7
24
$
6 To use scale (2) or (3) project
21
5 horizontally to scale (1)• then
use straight Inclined line through
4
D and 4 scales, or reverse as
.8
6
3 Illustrated.
.6
18
2
15
.5
5
.5
1.0
12
ENTRANCE TYPE
SQUARE- EDGE WITH
HEADWALL
rr
IIS
PLAN 1�
GROOVE END WITH
HEADWALL
.rr
I I �
I
6PLAN (2)
GROOVE END
PROJECTING
1�
2009 Surface Water Design Manual 1/9/2009
Exhibit H
KING COUNTY, YvASHINGTON, SURFACE WATER DE.iGN MANUAL
TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
ry
Part 1 ,PROJECT 01�NNER-AND
PROJECT
Project Owner OF
Phone '430— 7'Y 7
Address tOy-i 5- 61174 /116"
1Z e +jei , LJA `9 Y,0 s*' -7
Project Engineer 141le3d QU!JwV1
Company C, +
, 0,P QPM
Phone ggs--00— 7n7
3'..," TYPE `OFPERMITAPPLIC10'
❑ Landuse Services
Subdivison / Short Subd. I UPD
Ll Building Services
MIF /Commerical / SFR
El Clearing and Grading
❑ Right -of -Way Use
❑ Other
'i
art 2.; PROJECT LOCATION
RIPTIO
DFW HPA
Project N arne't-1 A (,J4
Ll
DDES Permit#
54v(M �9+jo Jz'AF&&,rft
Location Township
31 Al
Range
Date (include revision
Section
RockeryNault/
Site Address Iq 114
j'A rohl A Ve MF , kpnii*
`"Paet OTHER REVI EWS:AN D.'PERM ITS:'..'.':-.,-'.
Technical Information Report
DFW HPA
❑ Shoreline
Ll
COE 404
Management
Ll
DOE Dam Safety
Ll Structural
Date (include revision
RockeryNault/
Ll
FEMA Floodplain
LJ ESA Section 7
W
COE Wetlands
Date of Final:
El
Other
�K.:'
T -PLA "A -REPORT.-., INFORMATION
Technical Information Report
Site Improvement Plan (Engr. Plans)
Type of Drainage Review Full 14arge te d)1
Type (circle one)- Ful / Modified I
(circle): Large6�rf,5urj A
mall Site
Date (include revision
Date (include revision
dates):
dates):
Date of Final:
Date of Final:
Part fi
DJUST MEN T-ApPROVALS
Type (circle one): Standard / Complex / Preapplication / Experimental / Blanket
Description: (include conditions in TIR Section 2)
Date of
(' Exhibit I
2009 Surface Water Design Manual
1
1/9/2009
14 4,vg
IWS7
KING COUNTY, WASHINGTON, SURFACE WATER DE6iGN MANUAL
TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
:Pak -.1-1 DRAINAGE DESIGN LIMITA
REFERENCE
Q Core 2 — Offsite Analysis
0 Sensitive/Critical Areas
C3 SEPA
0 Other
E]
I Ll Additional Sheets Attached
Sh6etper Threshold Dlscha. e
,Pa rt.1 2TI�SUMMARY.SHEET.;(dvldeone"Tl!Sdm'ma A
Threshold Discharge Area:
(name or description)
Core Requirements (all 8 apply)
DischWqe at Natural Location
Number of Natural Discharge Locations: ';L
Offsite Analysis
Level: 012/3 dated:
Flow Control
Level: 1 / 2 / 3 or Exemption Number
(Incl. facility summary sheet)
Small Site BMPs
Conveyance System
Spill containment located at:
Erosion and Sediment Control
ESC Site Supervisor:
Contact Phone:
After Hours Phone:
Maintenance and Operation
Responsibility: Private
If Private, Maintenance Loci Required: Yes 1 No
Financial Guarantees and
Provided: Yes / No
Liability
K11
Water Quality
Type: Basic / Sens. Lake / Enhanced Basicm Bog
(include facility summary sheet)
or Exemption No.
Lan dscape Management Plan: Yes / No t'i
Special Requirements as applicable)
Area Specific Drainage
Type: CDA / SDO / MDP / BP I LMP I Shared Fac. None
Requirements
Name:
Floodplain/Floodway Delineation
Type: Major / Minor / Exemption / None
. 1A
100 -year Base Flood Elevation (or range):
Datum:
Flood Protection Facilities
Describe:
Source ControlDescribe
landuse:
(comm./industrial landuse) QJA
Describe any structural controls:
2009 Surface Water Design Manual 3 1/9/2009
KING COUNTY, . iSHINGTON, SURFACE WATER DL -JN MANUAL
TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
;Part :f6`.EASEMENTS7 TS
Part:1B 6 ST40 CTU RAL ANALYSIS
Drainage Easement
❑ Cast in Place Vault
❑ Covenant
❑ Retaining Wall
❑ Native Growth Protection Covenant
Q Rockery '> 4' High
L) Tract
Ll Structural on Steep Slope
L3 Other
0 Other
.-2SIG.Part';.l V: NATURE-'OF-..PROFESSIONALENGINEERf"'7"'--'I;""':..-
1, or a civil engineer under my supervision, have visited the site. Actual site conditions as observed were
incorporated into this worksheet and the attached TecOical Information Report. To the best of my
knowledge the information providedliegs is accurate./
, Ulilukwl-- UI AW
2009 Surface Water Design Manual 5 1/9/2009
C}ty of Renton
Planning Division
JUN 3 0 2011
E(CEYVED
Lincoln Avenue NE Culvert Replacement
Wetland and Stream Report
Submitted to:
City of Renton
1055 S. Grady Way
Renton, WA 98057
Prepared by:
Otak, Inc.
10230 NE Points Drive, Suite 400
Kirkland, WA 98033
Otak Project No. 31821A
June 27, 2011
Lincoln Avenue NE Culvert Replacement
Wetland and Stream Report
I Introduction
Otak, Inc. has been contracted by the City of Renton to provide survey and environmental
permitting support in order to: 1) replace a damaged culvert across Lincoln Avenue NE; and
2) replace the existing culvert inlet structure for the unnamed stream, located near the
intersection of NE 40`s Street and Monterey Place NE — approximately 600 feet south of the
damaged culvert (see attached vicinity map). Two types of critical area, per the Renton
Municipal Code (RMC) 4-3.050 exist in the project vicinity: an unnamed stream and several
small wetlands. No Class 1 wetlands or documented presence of non -salmonid species
proposed or listed by the Federal government or State of Washington as endangered,
threatened, candidate, sensitive, monitor, or priority occur in the project area, thus there is
no critical habitat per the RMC 4-3-050 K.
As a result of heavy rains in December 2010, concentrated runoff from Lincoln Avenue NE
saturated the road embankment on the west side of the street (on the downstream side of
the Lincoln Ave. culvert), causing the embankment to partially fail from the toe of the
embankment slope to the centerline of the road. The slide broke away portions of the
culvert and buried its outlet. To help stabilize the embankment, the City Maintenance
Division made temporary repairs by backfilling Lincoln Avenue NE with gravel and
patching the damaged asphalt shoulder and southbound lane. A section of 12 -inch PVC pipe
was inserted inside the broken outlet and extended out to prevent any additional erosion of
the embankment from covering up the outlet.
The repair project will replace the damaged culvert with a new culvert of the same diameter.
The culvert inlet structure will likely be replaced with a Type 2 structure with a bird cage
weir/trash rack. The culvert, roadside ditches, driveway culverts, and the inlet structure will
be designed to meet the current stormwater design standards adopted by the City of Renton.
All portions of the project will take place within the existing road prism and right-of-way.
2. Existing Conditions
Damaged Culvert
The damaged culvert crosses Lincoln Avenue NE approximately 800 feet south of NE 43`d
Place. It conveys runoff across the road from portions of Lincoln Avenue NE and the
adjacent hillside to an undeveloped parcel on the west side of the road. The culvert is an 18 -
inch diameter concrete pipe constructed prior to 1994. The upstream end of the culvert is
connected to a Type II Manhole with a birdcage trash rack mounted over the access
opening. Runoff from approximately 13 acres of the forested hillside and a portion of the
northbound lanes of Lincoln Avenue NE enters roadside ditches and flows through
driveway culverts along the east side of Lincoln Avenue NE and Monterey Place NE prior
to discharging into the Type II inlet structure.
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Roadside Ditches and Driveway Culverts
There are five. rock -lined ditches and three driveway culvert crossings along the east side of
Lincoln Avenue NE that collect and convey runoff from the east half of the road and the
adjacent hillside to the inlet structure of the damaged culvert. The ditches are roughly two
feet deep, with a taro- to three-foot bottom width, and approximately six- to eight -foot
width at full bank width. The ditches are lined with a mixture of stone sizes from gravel to
12 -inch rock. The ditches appear to be manmade drainage features, constructed and
maintained as a result of the operation of Lincoln Ave. NE.
Unnamed Stream
A portion of an unnamed stream is located within the project area. The relatively large
stream basin of approximately 80 acres is located east of Monterey Place NE, and it is
primarily composed of a forested hillside and residential neighborhoods. Within the project
area, the unnamed stream flows northwest in a ditch on the northeast side of Monterey Place
NE. It enters an inlet structure near the southeast corner of NE 40 h Street, and flow is
ultimately conveyed to the west side of Lincoln Avenue NE, where it continues northward
in a somewhat confined ravine. The damaged culvert outlets east of the unnamed stream
channel, and flow from the culvert confluences with the unnamed stream outside of the
project area. Eventually the unnamed stream drains to Lake Washington after crossing
Interstate 405.
Culvert Inlet for the Unnamed Stream
As described above, the inlet for the unnamed stream is located near the southeast corner of
NE 40`' Street and Monterey Place NE, approximately 600 feet south of the damaged
culvert inlet. The inlet structure for the unnamed stream is steel and rectangular shaped, with
a fiat three-foot by six-foot grated steel inlet. The outlet of the structure is a 30 -inch
diameter corrugated polyethylene (CPE) pipe that crosses to the west side of Monterey Place
NE to a Type 11 catch basin with a bird cage trash rack on top. This birdcage inlet receives
additional flow from a roadside ditch and any overflow from Wetland C. The pipe continues
out of the structure and across Lincoln Avenue NE before discharging into a ravine where it
combines with additional flow from another ditch. The stream then flows north, passing
through culverts under an apartment access road and eventually merging with the discharge
from the damaged culvert. The inlet structure and approximately 110 feet of channel
upstream of the inlet structure occur as a ditched system located within the road prism of
Monterey Place NE.
During the December 2010 storm event, the unnamed stream inlet near NE 40`s Street
became clogged with debris, forcing the stream to bypass the inlet and spill over the road. It
appears that once the stream entered the roadway, it crossed northward over NE 40`s Street
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Continued
where it entered the series of roadside ditches and driveway culverts along the east side of
Lincoln Avenue NE that outlet to the damaged culvert. The storm flow appeared to exceed
the capacity of the ditches and driveway culverts, and overflow continued across Lincoln
Avenue NE as concentrated flow before reaching the top of the embankment above the
damaged culvert. As described above, the concentrated flow saturated the embankment on
the west side of Lincoln Avenue NE, ultimately causing the embankment to fail and damage
the culvert.
Because the instability of the slope could result in additional embankment failure and
constitutes a safety hazard, the City's intent is to complete project construction no later than
October 2011, prior to the autumn and winter storm seasons.
3. Methods
Wetlands
The City of Renton Municipal Code (RMC) 4-3-050.M4a requires that wetland delineations
be conducted according to procedures in the Washington State Wetlands Identification and
Delineation Manual (Washington State Department of Ecology, 1997). To maintain
consistency between state and federal wetland delineation procedures, Washington State
Department of Ecology (Ecology) recently repealed WAC 173-22-080 (which required the
use of the Ecology delineation manual) and replaced it with WAC 173-22-035, which
requires that delineations be conducted according to the currently approved federal manual
and applicable regional supplements. The regulatory change became effective on March 14,
2011, so wetland delineations were conducted according to the routine wetland
determination method in the federal manual and the Western Mountains, Valleys, and Coast
Regional Supplement (U.S. Army Corps of Engineers, 2010). As specified in the manuals,
the three -parameter approach, which relies on the presence of field indicators for
hydrophytic vegetation, hydric soils, and hydrology, was used to identify and delineate
wetlands within the project area.
Streams
The ordinary high water mark (OHWM) of the unnamed stream was identified according to
the definition of OHWM provided in WAC 173-22-030[11] and RMC Title N, Chapter 3,
Section 4-3-050.Llbi. WAC and RMC define OHWM as the mark that will be found by
examining the bead and banks and ascertaining where the presence and action of water are
so common and usual, and so long continued in all ordinary years, as to mark upon the soil a
character distinct from that of the abutting upland, in respect to vegetation.
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Otak staff flagged the OHWM at 13 locations along the main channel, and 8 locations in the
roadside ditch. Otak survey crews recorded the locations. In addition, a stream habitat
survey on the unnamed stream was conducted from 150 feet upstream of the Monterey
Place NE grate to approximately 425 feet downstream of the culvert underneath Monterey
Place NE (50 feet downstream of the confluence of flow from the damaged culvert with the
unnamed stream). Data on channel dimensions (bankful and wetted), bank stability, woody
debris (>0.8 ft diameter, >6 ft. length), channel substrate, and riparian habitat and species
were collected.
4. Results
Wetlands
Five wetlands were identified near the project area, but not directly associated with the
proposed project activities. Two wetlands (A and C) are partially located in the right-of-way;
Wetland A is near the damaged culvert beneath Lincoln Ave. NE, and Wetland C is in the
right-of-way at the intersection of Lincoln Avenue NE and Monterey Place NE. Three
wetlands (B, D, and E) are located just outside of the tight -of -way Wetland B is located
near the upstream limits of the project at Monterey Place NE, Wetland D is located
alongside the unnamed stream near an apartment complex, and Wetland E is located near
the upstream end of the damaged culvert. All five wetlands lie outside of the limits of activity
for the proposed project. Due to limited property access, only Wetland C was delineated in
its entirety.
Wetland A
Wetland A is a riparian, palustrine emergent wetland associated with the unnamed stream. It
is located'near the base of the damaged culvert, approximately 35 feet beyond the limits of
the proposed project activity, in a small, flat valley on the west side of Lincoln Avenue NE.
The Lincoln Avenue NE road prism is on the east side of the wetland, the prism of an
apartment complex fire access road is located on the south side, and there is a small berm on
the west side. Water flows north out of the wetland via overland flow and the unnamed
stream. The majority of the road prism vegetation outside of Wetland A is dominated by
non-native grasses and large stands of Himalayan blackberry (Rubuc armeniacus).
At the time of the site visit the Wetland A soils were saturated to the surface and the water
table was present within three inches of the surface, thus satisfying wetland hydrology
criteria. The primary source of hydrology for Wetland A is from overflow of the unnamed
stream that comes in from the north, as well as flows from the damaged culvert from the
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east. Secondarily, Wetland A also likely receives hydrology from shallow groundwater,
precipitation, and stormwater runoff.
The soils in Wetland A are dominated by very sandy soils that are deposited when the stream
overflows its banks. Starting approximately 10 inches below the surface there are gleyed clay
peds (Gley 2, 5/10G) mixed amongst the sand, which meets hydric soil criteria and perch
water in the soils above.
Wetland A vegetation is dominated by reed canary -grass (Phalarss arundinacea) and skunk
cabbage (Lysichiton americanum), both of which are hydrophytic species. At the south end of
the wetland, vegetation consists of salmonberry (Rubus spectabilis) and wax currant (Ribes
divaricatum). At the north end of Wetland A, vegetation transitions to a dense stand of willow
(Salix sp.) and red -osier dogwood (Cornus sericea) along the unnamed stream. The Lincoln
Avenue NE road prism is densely vegetated by Himalayan blackberry, while the adjacent
upland areas are dominated by red alder (Alnus rubra), big -leaf maple (Acer macmpbyllum), and
black cottonwood (Populus balsamifera).
Per Renton Municipal Code (RMC) Tide N, Chapter 3, Section 4-3-050.M1a, Wetland A is
classified as a Category 2 wetland because it does not meet the criteria for Category 1 or 3
wetlands. Category 2 wetlands require a 50 -foot buffer width (RMC 4-3-050.M6c).
Wetland B
Wetland B is a palustrine emergent wetland located at the southern end of the project area,
on the northeast side of Monterey Place NE and beyond the limits of the proposed project
activity. It is a riparian wetland associated with the unnamed stream. Above Wetland B, the
unnamed stream flows west in a natural channel, but near the right-of-way, the stream
sharply turns to the north and flows in a man-made ditch within the Monterey Place NE
road prism. Wetland B is located where the stream turns the comer. Only the southwestern
portion of the wetland located within the right-of-way was delineated. However, the wetland
also appears to be located on the northeast side of the stream as well, outside of the right-of-
way.
Wetland B primarily receives hydrology from stream flow and stormwater runoff from
Monterey Place NE.
The soils in Wetland B have likely been modified by the construction of the road prism and
the ditch, and sampling efforts met with rock refusal at 10 inches. The soil was a black
(10YR 2/1) silty sand with gravel and smelled of hydrogen sulfide, thus satisfying hydric soil
criteria.
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Continued
Vegetation in Wetland B was dominated by creeping buttercup (Ranunculus repens), slough
sedge (Carex obnupta), and bentgrass (Agrostis sp.), all of which are hydrophytic species.
Immediately outside of the wetland, adjacent to the road shoulder, the vegetation is
dominated by dandelion (Taraxacum oficianale), bentgrass, and velvet grass (Holcus lanatus).
Per RMC 4-3-050.M1a, Wetland B is classified as a Category 2 wetland because it does not
meet the criteria for Category 1 or 3 wetlands. Category 2 wetlands require a 50 -foot buffer
width (RMC 4-3-050.M.6.c).
Wetland C
Wedand C is a depressional, palustrine scrub -shrub wetland located on a triangular-shaped
parcel located at the intersection of Lincoln Avenue NE and Monterey Place NE. The parcel
appears to have been modified by building a berm on the west side - possibly to hold
stormwater runoff. The east side of the property is bounded by the Monterey Place NE road
prism. The wetland is bounded by the berm to the west and north, the road prism to the
east, and a retaining wall for the parcel to the south. At the north end of the parcel the berm
gradually declines and there is a catch basin with a trash rack.
Hydrology for Wetland C appears to be from stormwater runoff; however, there are no
culverts that outlet onto the property. It appears that water sheet flows onto the site from
Monterey Place NE. At the time of the site visit, there were areas of standing water up to
four inches deep, which satisfied wetland hydrology criteria.
The soils in Wetland C were sandy clay loam (10YR 3/1) that smelled of hydrogen sulfide,
thus satisfying the hydric soil criteria. The soil layer below three inches contained
approximately 50 percent gravel.
Vegetation in the ponded areas was sparse, and was dominated by algae, along with some
lady fern (Athy Nm filix femina) and horsetail (Eguisetum telmateia). On higher points,
hummocks, and around the edge of the wetland, the vegetation was dominated by red alder,
salmonberry, and Himalayan blackberry. The majority of the dominant species in the
wetland are hydrophytic.
Per RMC 4-3-050.M1a, Wetland C is classified as a Category 3 wetland because it has
human -related hydrologic alterations and the alteration of soils. Category 3 wetlands require
a 25 -foot buffet width (RMC 4-3-050.M6c).
Wetland D
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Wetland D is a riparian, palustrine emergent wetland located on the east side of the unnamed
stream, upstream from Wetland A on the west side of Lincoln Avenue NE. An apartment or
condominium complex is located above the west side of the stream. The stream and wetland
are confined by retaining walls constructed with boulders to support the condominium
complex and the road prism to the east.
Wetland D primarily receives its hydrology when the unnamed stream overtops its banks. It
also receives hydrology from direct precipitation, and possibly from a high groundwater
table. At the time of the site visit, soils were saturated to the surface and the water table was
located within four inches of the surface, thus meeting wetland hydrology criteria.
The soils in Wetland D were a black (10YR 2/1) silty fine sand that smelled of hydrogen
sulfide, which satisfied hydric soil criteria.
Dominant vegetation included reed canary -grass, skunk cabbage, and willow, all of which are
hydrophytic species. Vegetation covered only approximately 60 percent of the wetland area,
and there was a layer of sand that appeared to have been deposited during a recent flood
event.
Per RMC 4-3-050.M1a, Wetland D is classified as a Category 2 wetland because it does not
meet the criteria for Category 1 or 3 wetlands. Category 2 wetlands require a 50 -foot buffer
width (RMC 4-3-050.M6c).
Wetland E
Wetland E is a palustrine forested wetland located on the east side of Lincoln Avenue NE,
adjacent to the inlet of the damaged culvert. Due to a lack of property access permission,
Otak staff did not delineate Wetland E, but observed it from Lincoln Avenue NE -wetland
delineation flags from a previous delineation were visible, marked as "C-6 (Old)", "C-7
(Old)", and "C-11 (Old)" on the project design drawing C2. At the time of the site visit the
area surrounding the culvert inlet had standing water up to 12 inches deep. There is no
vegetation in this area and it appears that it was excavated to hold additional volume. The
inlet structure for the damaged culvert is located outside of Wetland E but•urithin the
Wetland E buffer, adjacent to the road prism. As described earlier, the inlet structure is
covered with a bird cage and surrounded by a cement platform that is approximately 6 feet
in diameter.
Understory vegetation is dominated by Himalayan blackberry and reed canary -grass, with a
tree canopy dominated by red alder and black cottonwood. Other species in the herbaceous
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layer include creeping buttercup, skunk cabbage, lady fern, American speedwell (Veronica
americana), and horsetail.
Although Otak staff did not directly assess the wetland, Wetland E appears to be classified
as a Category 2 wetland per RMC 4-3-050.M1a because it does not meet the criteria for
Category 1 or 3 wetlands. Category 2 wetlands require a 50 -foot buffet width (RMC 4-3-
050.M6c).
Streams
The unnamed stream adjacent to the project site was investigated from approximately 150
feet upstream of the inlet to the Monterey Place NE culvert to approximately 50 feet
downstream of the confluence with the flow from the damaged culvert and its ditches above
the culvert (approx. 425 feet downstream of the outlet of the Monterey Place NE culvert).
The OHWM was flagged through three distinct reaches which are described below from the
upstream to downstream direction.
Upstream of Monterey Place NE
Upstream of Monterey Place NE the stream consists solely of riffle habitat with a gradient
averaging approximately 7 to 8%. The OHWM averages 8.0 feet wide with a depth of 0.6
feet in the upper part of the reach and 1.8 feet in the downstream section as the channel
deepens near the inlet to the culvert. Stream substrate consisted primarily of gravel, with
fines and cobbles representing subdominant substrate components. No woody debris was
present in the upstream reach. The stream is directly adjacent to the roadway for 110 feet
immediately upstream of the culvert. The distance from the roadway to the nearest high
water mark is as little as 2 feet in places. The culvert under Monterey Place NE and Lincoln
Avenue NE imposes a complete barrier to fish passage due to several drops in excess of 2
feet through several storm drainage features.
Vegetative Cover
Vegetation along the stream reach upstream of the Monterey Place NE culvert consists of a
mix of invasive vegetation, mowed right of way, native shrubs and trees, and nearby
landscaped areas. The plant community in the immediate vicinity is mostly a mix of shrub,
herbaceous, and ornamental species. In addition, the impervious surface of Monterey Place
NE is immediately adjacent to this reach of the unnamed stream. Himalayan blackberry and
reed canary grass are the predominant invasive species, while red alder, western red cedar,
Douglas fir, and black cottonwood comprise the native tree species. Sahnonberry and
snowberry are present in the shrub layer, while herbaceous species present in the right of
way and nearby include sword fern, horsetail, piggyback plant, sedge species, and creeping
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Continued
buttercup. Invasive species generally comprised a dominant component of the vegetative
community (>20% of the cover).
Ecological Functions
Ecological functions provided by this reach of the unnamed stream include hydraulic
functions (e.g. transport of sediment, connectivity of flow and water volume transport to
downstream reaches via water cycling processes), geochemical functions (input and transport
of organic debris to downstream reaches, water quality), habitat functions (e.g.
geomorphologic and channel forming dynamics, woody debris, habitat units such. riffles,
pools, etc.), and biological/biodiversity functions (riparian vegetation, invertebrate fauna,
fish, other aquatic biota, etc.).
Sediment in the system appears to be transported from the steeper gradients upstream, and
consists primarily of gravels. The stream appears to be perennial, and water is transported
downstream throughout the year, although base flows appear low and development in the
project vicinity likely has resulted in a flashy hydropetiod for the system. Organic debris is
likely to be introduced into the system from further upstream and transported downstream
during times of the year when flows are sufficient to move material. Water quality is likely to
be at least somewhat impaired periodically due to runoff from roadways and other
impervious surfaces. Bank stability appears stable upstream of the culvert, and the
downstream portion is armored. Habitat is simplified in the project reach, consisting of
homogenous riffle habitat in a straight, ditched channel adjacent to the roadway of Monterey
Place NE. No woody debris occurs in the project stream reach. Biological functions are
likely limited in this portion of the system ---riparian habitat function is impacted by the
roadway, fish are likely absent in the system due to low base flows and downstream
blockages, and the simplified stream habitat and flow regime likely limits other aquatic biota
as well.
Fish and Wildlife Use
No fish use is documented in the stream reach upstream of Monterey Place NE, nor was any
observed during the field visits. Although the stream is perennial, the very low flows in the
summer, the position of the project reach adjacent to the roadway, and the isolation of the
system from the downstream reaches make it unlikely that fish occur in this portion of the
system. Wildlife that might occur in the project area include bird species common to
residential areas with tree and shrub vegetation, including crows, robins, Steller jays, song
sparrows, starlings, and various other song birds. Woodpecker species such as downy or
hairy woodpeckers are likely to occur, and various owl and hawk species are also potentially
present. Amphibian species are likely limited to Pacific chorus frogs, but there is some
potential for red -legged frogs to occur due to an aquatic system and some forested upland
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habitat. Mammal species likely to be present include small mammals such as mice, voles,
squirrels, and moles and gophers. Other mammals likely to occur on or near the project site
include raccoons, opossums, coyote, and deer.
Tire Protection Measures
No trees will be removed in this stream reach, therefore no tree protection measures are
proposed.
Downstream of Monterey Place NE
Downstream of the Monterey Place NE and Lincoln Avenue NE culverts, the stream travels
for approximately 420 feet prior to a set of culverts that convey flow under the entrance
road for an apartment complex. This reach is primarily riffle habitat with a slope averaging
5%. The average OHWM width in this reach is 7.4 feet and the depth averages 0.7 feet.
Previous restoration and/or stabilization efforts are apparent in the louver 200 feet of this
reach with several anchored logs on, the banks, channel spanning grade control logs and
streambed gravel and cobbles placed in the stream. At the downstream end of the reach
there is a birdcage inlet to a 36 -inch diameter culvert that is the primary conveyance for the
stream. There is an additional overflow 36 -inch diameter on the downstream side of the
birdcage inlet. Inside the birdcage inlet, there is a drop of approximately 2 feet that imposes
a complete barrier to fish passage.
Downstream of the apartment access road, the stream loses it channelization for the
immediate 50 feet downstream of the culvert outlet. The flow is dispersed into several small
channels or, in many places, sheet flow through patches of reed canary grass. The floodplain
(Wetland A) in this area is completely covered with reed canary grass. Not long after the
stream re-channelizes, it becomes incised and there are two large drops (1 to 2 feet) into a
series of pools. The confluence with the flow coming from the damaged culvert is 10 feet
downstream of these pools. Downstream of the confluence with outflow from the damaged
culvert, the OHWIVM width averages 9.5 feet with an average depth of 1.4 feet. The slope in
this reach is lower, averaging 2 to 3%. The hydrology and stream dimensions upstream of
the apartment access road culverts, which are barriers to fish passage, are analogous to the
downstream reach which would suggest that the upstream reach is also a perennial, although
non -salmonid bearing, stream.
Vegetative Cover
This reach of the unnamed stream is situated down and away from the roadway compared to
the upstream reach, and the vegetative community in this reach is comprised of a primarily
deciduous forested and shrub habitat Dominant tree species include red alder, black
cottonwood, and big -leaf maple, with some conifers such as Douglas fir and western red
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Continued
cedar present, as well. Common shrub species in the understory include vine maple,
Himalyan blackberry, English ivy, red -osier dogwood, Oregon grape, salmonberry, and
willow. Herbaceous species present and identifiable at the time of the site visit include
skunk cabbage, reed canary grass, lady fem, sword fern, and horsetail. Invasive species
generally comprised a,dominant component of the vegetative community (>20% of the
cover).
Ecological Functions
Ecological functions provided by this reach of the unnamed stream include hydraulic
functions (e.g. transport of sediment, connectivity of flow and water volume transport to
downstream reaches via water cycling processes), geochemical functions (input and transport
of organic debris to downstream reaches, water quality), habitat functions (e.g.
geomorphologic and channel forming dynamics, woody debris, habitat units such. riffles,
pools, etc.), and biological/biodiversity functions (riparian vegetation, invertebrate fauna,
fish, other aquatic biota, etc.).
Sediment in the system appears to be transported from the steeper gradients upstream, and
consists primarily of fines in the flatter portions of the reach, particularly that portion
associated with Wetlands A and D. Similar to the upstream portion, base flows appear'low
and development in the project vicinity likely has resulted in a flashy hydroperiod for the
system. Organic debris is likely to be introduced into the system from the riparian corridor
associated with the project reach as well as from further upstream and transported
downstream during times of the year when flows are sufficient to move material. Water
quality is likely to be at least somewhat impaired periodically due to runoff from roadways
and other impervious surfaces. Stream banks are somewhat unstable or armored through
much of the reach, indicating that erosion associated with flashy/high peak flows is likely to
occur during storm events. Habitat is relatively simplified in the project reach, consisting
solely of riffle habitat. Eight pieces of woody debris were noted in the 425 foot reach of
stream, along with anchored logs and in -channel logs serving as grade control structures.
Biological functions show the potential to be somewhat improved in this portion of the
system compared to the upstream reach—riparian habitat, while constrained between an
apartment complex and the roadway, nevertheless forms a forested corridor 80 to 100 feet
wide, resident cutthroat trout are likely to be present in the system, and the riparian and
stream habitat appear capable of supporting other aquatic biota such as benthic invertebrate.
fauna and amphibian species.
Fish and Wildlife Use
Although the stream is typed by the City of Renton as a Class 2 stream (perennial or
intermittent salmonid -bearing), no documented evidence of salmonid usage was readily
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Continued
available for this project. It is assumed that resident cutthroat trout are present in the
system, meeting the criterion for a Class 2 stream.
Wildlife usage and species likely to occur on or near the project site in this reach of the
unnamed stream are similar to those indicated in the upstream reach, noted above. The
riparian corridor in the project reach has the potential to serve as a migration/movement
corridor for wildlife, as well.
Tree Protection Measures
No trees will be removed in this stream reach, therefore no tree protection measures are
proposed.
Unnamed Stream Classification
Upstream of Monteny Place NE
The reaches of the unnamed stream that occur upstream of the Monterey Place NE culvert
would be considered a non -salmonid -bearing waterbody, based on the presence of a
complete fish passage barrier associated with the Monterey Place NE culvert drop structures
and the definition of a salmonid migration barrier per RMC 411-190:
Human -made barriers to salmonid migration (e.g., culverts, weirs, etc.) shall be considered barriers
to salmonid migration by this definition, only if they were lawfully installed; permanent; present a
complete barrier to salmonid passage based on hydraulic drop, water velocity, water depth, or any
other feature which would prevent all salmonids firm passing upstream; and in the opinion of the
City Reviewing Oficial cannot be modified to provide salmonid passage without resulting in
significant impacts to other environmental resources, major transportation and utility gstems, or to
the public, and would have significant expense.
Based on the perennial flow regime associated with the,unnamed stream upstream of the
Monterey Place NE culvert, these stream reaches would be classified as a Class 3 stream,
with a 75 foot buffer requirement.
Downstream afMonterey Place NE
The section of the stream below the Monterey Place NE culvert is listed on the Renton
Water Class Map as a Class 2 stream, which is defined as a salmonid -bearing perennial
stream. The buffer requirement for Class 2 Waters is 100 feet (RMC 4-3-050.1,5a). No
project -related activity will take place in any of these stream reaches.
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Continued
Ditches
The OHWM of the ditches along the east side of Lincoln Avenue NE were delineated
during the stream survey. The average OHWM width in the ditches is 5.3 feet. The ditches
did not have flow present during the investigation. They are lined with coarse, angular
gravels and small riprap approximately 12 inches in size, and the ditches are split by three
driveway culverts with diameters ranging from 12 to 18 inches. RMC 4-3.050L1 classifies
this type of conveyance feature as a Class 5 Water (non -salmonid, flow in artificial channel
where no natural channel before). RMC 4-3-050.L5a does not assign buffers to Class 5
waters, and such water bodies ate considered unregulated per the RMC. No work will be
conducted in the ditches along the east side of Lincoln Avenue NE.
S. Wetland and Stream Buffer Impacts and Mitigation
Although the project•will avoid direct impacts to wetlands altogether, and avoid direct
impacts to streams outside of the existing road prism, there will be some temporary impacts
to wetland and stream buffers located within the tight -of -way in order to perform the
necessary maintenance and repair activities, and some temporary impacts to the unnamed
stream at the Monterey Place NE culvert. There will be limited excavation and placement of
quarry spalls in a short portion of stream within the road prism, immediately upstream of the
Monterey Place NE culvert.
However, RMC 4-3-050.C.5.e.ii exempts wetlands and streams and their buffers from
disturbances associated with normal and routine street and right-of-way maintenance and
repair activities. The rule specifically states:
`Normal and routine maintenance and repair of any existing public orprivate uses and facilities
where no alteration of the critical area and required buffer or additional fill materials u411 be placed
other than the minimum alteration and/ or fill needed to restore those facilities to meet established
safety standards.. The use of heavy construction equipment shall be limited to utilities and public
agencies that require this type of equ pment for normal and routine maintenance and "pair of
existing utility orpublic structures and rights-of-way. In every case, critical area and required buffer
impacts shall be minimized and disturbed areas shall be restored during and immediately after the
use of construction equipment. "
Restoration efforts will consist of revegetation of disturbed soils using a native grass seed
mix. Stream and wetland impacts were largely avoided during project design, and impacts to
the unnamed stream were minimized to minor amounts of excavation and placement of
quarry spalls for erosion protection in the toad prism upstream of the Monterey Place NE
culvert. No mitigation is proposed for the project, given the anticipated exemption from the
applicable portions of the RMC critical areas sections.
Lincoln Avenue NE Culvert Replacement 13
otak
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a
CHECKED FOR COMPLIANCE
TO CITY STANDARDS
Date
Date
Date
PROJECT STREET ADDRESS: 4196 Lincoln Ave NE, Renton, WA
2005 NE 40th St, Renton, WA
RECOMMENDED
FOR APPROVAL
m
NO.
REVISION
SHT N0. DWG N0. TITHE
1 cl
2 C2
3 C3
DRAWN:
GMD
CHECKED:
BY I DATE I AP P R I APPROVED:
NO SCALE
As Noted
ONE INCH
AT FULL SCALE
IF NOT ONE INCH
SCALE ACCORDINGLY
VERnCAL- NAW 1988
HORIZONTAL- NAD 1983/1991
TITLE SHEET, LOCATION MAP, AND INDEX OF DRAWINGS
CULVERT REHABILITION AND GRADING
STREAM INLET MANHOLE AND PIPE
�=- CITY OE
RENTON
Planning/Building/Public Works Dept.
City O
s�'lents
pVii on
JUN 3 0 Zoll
90% DESIGN
LINCOLN AVE NE AND MONTEREY PL NE
STORM SYSTEM REPLACEMENT
TITLE SHEET, LOCATION MAP,
AND INDEX OF DRAWINGS
DATE -
06 -21-11
FIELDBOOK:
PAGE:
cl
SHEET: 1 OF: 3
N
a
SSMH �
RIM = 75.58
Z_8" PVC OUT N IE = 67\.23
8"PVC INSIE=67.43��
I
DRAINAGE EASEMENT
20114
M )
A - 73.62
12" W 1E 70.1
�.��i�.�
EX. 1 CONCRETE ULVERT
f GRA
1
I I
\ I OLD
S I OLD
/ l 30
I 4 '
I � I
- - - - - I10
16 54
i
� C
30"
:.........:.........:.........:.........:... SCALE'.HORIZ ...-:.��.........:........." * '' -, * '' - , '' * , ,:.......... * '' ...•.........:......... ... .... , , '",:.........:.........:.........:.........:,:::::::::::::::::::::::::::::
::::::::.:.........:.........:.........:.........:.........:...................:.........:..........Existi'' * * ...... * * * *
ng Grade.....:.........:.........EX.-eB--TYPE-2 54"......:.........:.........:.........:.........:
VRT=::t'=••':::: ......:......::::::........................:........................::::::......:::::::::::
:.........:.........:.........:.........:.........:......E .:.... .i:.:...............:commor).otior�..............•.... .........
:.........:.........:.........:... ---:....................................:...... Conduit:_..; ....:........ ..:.........:......... ......... .........:
:.:::::..:...:.:...:.:...::.:....:...::...:.:..:..:...:..:..::::::.:..:.:..:.:..:.:.:...:...:.:...:.:...:.:...:.:...:::::::....:....:.:.....:..:..::......:....::::::....:....:....:.:...:.....:..:..:...:.::::..:.-:....-:.. ..:....:...:o..:f...:e..:r :::.ba.n.k.m.e.n.t...:....... ..........::-.-�elat ..°.P.P:x:'.::..::.:..::..:::.::..::.:..::..:.::..:.:.:.:.: .....:....,.,................:..: :........................................ ..._...................... ...............:...............:...........:.............-----.:...............75'......
...
.......................3-AP?X:.................. ....... ..................
::::::: ::--:�::::'......:: :..............::.......-=F4n.is.heid-g-rade:::..'EX :8:PVC .---...... :........................... ................
...... ...... .................... .........:......... :......... :......... :.........
...... ......... ....Sdrnita'ry.Seve........:.......... ...... ......... ................... ..................
.... : : : .... :.................................... .........:.... .....:.......... . : . . :•:::
0...
:.•.................:..............................................:...................:...................:.............. .. 0..,.......................................................... ............... .................. .......................................:...................:...................:....... ........ - ........
:
A e-
:.........:.........:.........:.........:.........:...... ..-j1:-:...:.......-- �-- �C1S1�1� :.......:.........:........-=---......:.........:.........:......... ......... .........
:.:.:.:.:.:.:.:.:.:.�.:.:.:.:...-...:... Ex.12"-PVC -•:--•-.,..:....f..�-:..........�-:...: 3: .....:......... :......... :......... :......... :•........:.........:.........:.........:.. ...
. ...:........� -•-•--........................................... ... ........---..........:.......... .....:...................:.:------......:...................:.........................---------.....:...................:..................._...................-----.....................---....... .........
:.........:.........:.........:.........:.........:..... . ...� �............ .�-.•............:......... ...................:.................,...........:.........:.........:............65....:
:.........:.........:.........:..:12..1::6:1..3..... .�:.........:............................................................•...............................•..........................:
:.........:.............................:........ .........o.......................:.........:.......,,:....•....:.........
- • • • ' -.P.... .�.i . . - • - . : . . . : . . . • : • . . . • , • . : . • . . . . . : . • • . . . : • . . • • .
• y, yam:.
• • • . . . . . . . • • . • • • • • . . .
::::....:....:.....:.....:....:......:......:..:.......:...:::::.:.....:.....:.......:.................::::... 0... ••• • • ::::. ............. :.:..........................�...........:.......:..................................:...................:......................................:............................:............................:...............................:......................................:......................................:.....................................::...... -6... .............
....
............ . .: : . :
............... A x . . . ... ...:... . . . . . .:. ...... . . . . . ...... 0.
...... 0 .:"
L�catron::::::::::::::::::::::::::::::::: :::::::::::::::::::::::- -.. ........:::.......:......:........:....... i
..................:.........ofBr'ek...---....:..----...:.........:.........:----.....:.........:.........:.........:.........:.........
: i .... ......:: :::::::::......... ....................... ........ ...... ......... ::........... .........:1nPpe..:.......:.........
......... .........
PROFILE ALONG EXISTING CULVERT
CHECKED FOR COMPLIANCE
TO CITY STANDARDS
Date
Date
Date
RECOMMENDED
FOR APPROVAL
BY
BY
REVISION
- ar
r �r
�r
SCALE:
As Noted
ONE INCH
AT FULL SCALE
wc 0 mw
IF NOT ONE INCH
SCALE ACCORDINGLY
VERTICAL: NAVD 1988
HORIZONTAL.NAD 198;3/1991
CALL 48 HOURS BEFORE YOU DIG
1-800-424-5555
EXISTING UTILITY LOCATIONS ARE APPROXIMATE, NOT ALL UTILTIES MAY BE SHOWN.
CONTRACTOR IS RESPONSIBLE FOR LOCATING ALL UTILITIES.
GENERAL NOTES:
A. THIS PLAN DEVELOPED FROM SURVEY COMPLETED BY OTAK, INC.
UTILITIES NOT POTHOLED. DEPTHS ARE ASSUMED APPROXIMATE.
REF: KING COUNTY WATER DISTRICT NO. 107 WHITEHAWK OFF—SITE SEWER
EXTENSION AS BUILT.
B.
C.
0
0
0
TYPICAL TRENCH BEDDING AND BACKFILLTCN
TRENCH EXCAVATI❑N
PAY LIMIT 7'-0" MAXIMUM
SEE DETAIL FOR PAVEMENT PATCH
BACKFILL MATERIAL
WSDOT SECTION 9-03.19 BANK RUN GRAVEL,
OR NATIVE MATERIAL IF IT MEETS SPECS.
PIPE ZONE MATERIAL
WSDOT 2006 SECTION 9-03.12(3)
GRAVEL BACKFILL FOR PIPE ZONE BEDDING
NEW UTILITY PIPE
EXCAVATION OF UNSUITABLE SOIL (IF NEEDED)
DEPTH AS APPROVED BY ENGINEER
BACKFILL WITH FOUNDATION MATERIAL MEETING
WSDOT SECTION 9-13.6 QUARRY SPALLS
NOTES
1. PROVIDE UNIFORM SUPPORT UNDER BARREL.
2. HAND TAMP UNDER HAUNCHES.
3. COMPACT PIPE ZONE MATERIAL TO 95% MAXIMUM DENSITY
EXCEPT DIRECTLY OVER PIPE WHERE COMPACTION WILL BE HAND TAMP ONLY.
4. PIPE MUST BE ANCHORED IN SUCH A MANNER AS TO ENSURE THAT THE
FLOW LINE IS MAINTAINED.
CITY OE
RENTON
Planning/Building/Public Works Dept.
g0%
DES
LINCOLN AVE NE AND MONTEREY PL NE
STORM SYSTEM REPLACEMENT
CULVERT REPAIR
GN
"A.
t
�'r
)i ton
JON3n
DATE:
06-21-11
FlELDWOK:
PAGE:
DRAWING NO:
C 2
SHEET: 2 OF:
CONSTRUCTION NOTES:
INSTALL EROSION CONTROL BLANKET IN ACCORDANCE WITH MANUFACTURES
INSTRUCTIONS.
BLANKET SHALL MEET THE REQUIREMENTS OF DIVISION 9-14.5(2) OF
THE
WSDOT 2010
STANDARDS AND SPECIFICATION.
EXPOSE, CUTOFF AND DISPOSE BROKEN PORTION OF CONCRETE PIPE
AND
MAKE SMOOTH,
STRAIGHT EDGE. LAY NEW CPEP ALONG PROPOSED GRADE AND BUTT
UP
SPIGOT END TO
STRAIGHT EDGE OF CONCRETE PIPE. JOIN PIPES USING HEAT SHRINK
WRAP
MANUFACTURED BY RAYCHEM OR APPROVED EQUAL.
O
INSTALL CURED IN PLACE RESIN LINER MANUFACTURED BY IN—SITU FORM
OR APPROVED
EQUAL. RESIN LINER SHALL BE INSERTED ALONG ENTIRE LENGTH OF
CULVERT
04
PLACE 24" THICK RIP RAP PAD
0
0
0
TYPICAL TRENCH BEDDING AND BACKFILLTCN
TRENCH EXCAVATI❑N
PAY LIMIT 7'-0" MAXIMUM
SEE DETAIL FOR PAVEMENT PATCH
BACKFILL MATERIAL
WSDOT SECTION 9-03.19 BANK RUN GRAVEL,
OR NATIVE MATERIAL IF IT MEETS SPECS.
PIPE ZONE MATERIAL
WSDOT 2006 SECTION 9-03.12(3)
GRAVEL BACKFILL FOR PIPE ZONE BEDDING
NEW UTILITY PIPE
EXCAVATION OF UNSUITABLE SOIL (IF NEEDED)
DEPTH AS APPROVED BY ENGINEER
BACKFILL WITH FOUNDATION MATERIAL MEETING
WSDOT SECTION 9-13.6 QUARRY SPALLS
NOTES
1. PROVIDE UNIFORM SUPPORT UNDER BARREL.
2. HAND TAMP UNDER HAUNCHES.
3. COMPACT PIPE ZONE MATERIAL TO 95% MAXIMUM DENSITY
EXCEPT DIRECTLY OVER PIPE WHERE COMPACTION WILL BE HAND TAMP ONLY.
4. PIPE MUST BE ANCHORED IN SUCH A MANNER AS TO ENSURE THAT THE
FLOW LINE IS MAINTAINED.
CITY OE
RENTON
Planning/Building/Public Works Dept.
g0%
DES
LINCOLN AVE NE AND MONTEREY PL NE
STORM SYSTEM REPLACEMENT
CULVERT REPAIR
GN
"A.
t
�'r
)i ton
JON3n
DATE:
06-21-11
FlELDWOK:
PAGE:
DRAWING NO:
C 2
SHEET: 2 OF:
W
LO
0.
ME
;k
9S,o�
ET
T11
/
/
NEW C13-2 54
/ REMOVE EX. METAL VAULT
RIM EL.=113.40
NEW S 30" I E=110.40
ROPOSED
C RING LIMIT
/ 20 DRAINAGE I
4
Sficy,�..ro7Y.bn. .
117vu
\ t
'0
1151,
4 .
e
DOUB[ YELLO�;
SSMH
RIM = 115.11
8" PVC OUT N IE = 104.41--_'/
8"PVC INEIE= 105.11
8" PVC IN S IE = 104.61S 1
0
TRIPE
2X36"
SENT \
T.L. # 3345700163
8"
-10 i
8"
ORDINARY HIGH WATER MARK
8" /
8==
-125—
—SAND BAG COFFE�DAM — CENTER OF STREAM C NNEL117
` 120 P-3
DISCHAR PIPE /
Will
SSMH
RIM = 116.37
v '0
125. .......:............... ...:.:........... .....:...............:.......:...........'...:...:.,.....:..........._.:._.........:..._.........:-:":":":":":":•:-:•:-:-:-:-:-:-:-:":-:-:":�:-.•:•:•:":•:•:-:•:•:•:-:":":•:•:-:-:•:•:-:•:•:-:•:•:-:":":":":":•:-:":-:-:-:-:-:•:•:":-:-:•:•:•:-:":":•:•:":•:•:":":-:•:•:•:":-:•:-:•:":•:•:•:•:•:-:•:•:-:•:•:-:-:•:":-:-:":":":•..:-:1.25-:-:•:-:-:
......... :......... :.........:......... :.........:.........:......NEIN-�B-2:54....:.........:...... ...:.........:.........:.........:.........:......... :.........:.........:.........:.........
:.........:
::::::::::::::::::::::::::::::::::.REMO�/E:EX: METAL:YAUX.T::::::::::::::::::::::::::::::::::;::::::::::-FOG •:: EDGE OF.:::::::::::::::::::::::::::::::::::::::::::::::::::: -:
:::::::::::::::::::::::::::::::::::.RIM EL:=113:40•::::::::::::::::::::::''*'*'::::::':::::::'''*''::::-LAN :::pA1rElEN�::::::PROPER. -"::::::::::::::::::::::::::::::::::::::::
.........:.........:.........:.........:.........:.•••••......... NE4 3Q"•IE=1�Q.40.,......:.........:.........:.........:.........:.......•,........PROPERLY:LIi�E:****.---:.•••.""" ,- „--,:..... ,"
:::.::.•.............•......... ............................................................�..........................::::.:::.:::�............r......................,._.r............�..........................�.....-.............-..................-.......::.:::::.::...................................................................-.............-...............-.....................,- .::.:.:::-=::......-....�....-.........-. ......................E.......,
�........�.........�:.:::::.r...........�:..�.....�....�....::: ..................::....... ....................4..:...............................:............••.••.••.-�••••�•:. .....-..�.�......••.••::....•.••.••.••.••........:.:: .. .. .. .. .. .. .. ... .. I ...........
........•...:.........�.........
..'-....::..r..A..................:::�..�.�.. .., ..-...-.................:......�-...........................::.
.....�.•................................
....
.•••••......•••••.......... ...... ..... :......... •................................., ...... .............: r -20"
, ......_ ................IEuO�E'AND DlSPOS:OF...: ...... .... ....�r
.........:.........: ...:......CM�N• --.... ......:......... :.........
EL
.......:........EX•EALSTRUTURE--. �.-S1REM
.... ........ ....................................................... .........
.....................
.............:....�.........:.................... . ...:....C./ ............................
.........3a,IE=11,110 - �-......:......... ..........:.........:...........................:.........
.........:.......... �..... :o. .... .. ..........:......... .........:.........
................. .......5...................:...................:...................:. .... ........................,.•:.......................115....... ..............................................•COfFERD�M-FO.......:...........................EX; ................... R/�......... . . . . . ... ...... . . . . . . . . . . .
vt
.........:---.....................�---.............'BYPASSING STREAM ........... ......... ...... . . . . . . . . . . . . . . . . . . . . . . . . . . . .rr.t :• FLOWS -INTO- SANITARY ---- ---
............. --""---..... ....
:.: W ::::::::: ::: :::::: :::::: ::: : :::: •:: : :�:::::::::::::: :....- ------- ----
••.......:..............-- 0.-
...............-. . ....... ............... a �....-STREAK- CI AVI�ELIE='113:10.......:-110E-5.......-......:....-.................--~-::.-:..:
. . . . . . . . . . . . . . . . . . . . . . .
::::::::::::::::::::=:::::::::::::::::::::::::::::::::::::::::':::.5:LF'V*RC.P:0::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
105 --"-"-"-".......:.....:.:.:.:.:.:.:.:.:.:.:.:.:.:.:.:.:....:...............:...................:...................:...............:.:.:.....:...:.........:......,....:.......:...:.:.:.:.:...:.:..:.:.:.:.:.:.:.:.:..:.:.:.:.:.:.:.:.:..:.:.:.:.:.:.:.:.:.:.:.:.:.:.:.:.:.:.:..:.:•••............:.:.:.:.:.:.:.:.:.:..:.:.:.:.:.:.:.:.:..:.:.:.:.:.:." " " :•:•:•:.:.' ''-'''-405-'_
..................
.----.��ti„r, ...........................
:.........:.........:.........:..... . ...:.........:.SCALE =-H0'RlZ`::1. .1 .:.........:.... ---.....:.........:.........:........ - : - , - - SCALE • •H0:RIZ, -1: -- , 5:.........:.........:.........:........ .
........... ........................ ..........
. .........
:.........:.........:.........:.........:.........:.........:.�VERT;1f,-.5'..�.........:.........:...,.....:.........:.........:...,.....:....:1/ERT:-1=-5'•........:.........:.........:.........:
.........
.........
................... ......... ... ......... ......... .........
.......... ......... ......... .......
. ................. ................... ................... ....................................... ................... ............................................................................... ................... ................... ................... .............................................................................. .............. ................... ...................
PROFILE ALONG STREAM CENTERLINE
CROSS SECTION A—A
CHECKED FOR COMPLIANCE
TO CITY STANDARDS
Date
Date
Date
SCALE:
As Noted
ONE INCH
AT FULL SCALE
IF NOT ONE _INCH
VERTICAL: NAW 1988
HORIZONTAL- NAD 1983/1991
CALL 48 HOURS BEFORE YOU DIG
1-800-424-5555
EXISTING UTILITY LOCATIONS ARE APPROXIMATE, NOT ALL UTILTIES MAY BE SHOWN.
CONTRACTOR IS RESPONSIBLE FOR LOCATING ALL UTILITIES.
GENERAL NOTES:
A. THIS PLAN DEVELOPED FROM BASE SURVEY FROM OTAK, INC..
B.
C.
D.
CONSTRUCTION NOTES:
nl INSTALL BIRDCAGE OVERFLOW ON TOP OF TYPE 2 CB.
SEE STANDARD DETAIL PLAN 234.20
O2 INSTALL DEBRIS BARRIER ON BEVELED PIPE END SECTION. SEE STANDARD PLAN 223.10
O3 PLACE 18" THICK LOOSE QUARRY SPALLS
0
0
0
TYPICAL TRENCH BEDDING AND BACKFILL (NTS)
TRENCH EXCAVATION
PAY LIMIT 7'--0'v MAXIMUM
SEE DETAIL FOR PAVEMENT PATCH
a • . a "q • ° BACKFILL MATERIAL
° a'a WSDOT SECTION 9-03.19 BANK RUN GRAVEL,
OR NATIVE MATERIAL IF IT MEETS SPECS.
d Q
A-
d
A a ° PIPE ZONE MATERIAL
WSDOT 2006 SECTION 9-03.12(3)
° GRAVEL BACKFILL FOR PIPE ZONE BEDDING
12" MIN.
r :• NEW UTILITY PIPE
6 MIN ...
OF UNSUITABLE EXCAVATIONITABLE SOIL {IF NEEDED}
d DEPTH AS APPROVED BY ENGINEER
BACKFILL WITH FOUNDATION MATERIAL MEETING
a• WSDOT SECTION 9-13.6 QUARRY SPALLS
NOTES
1. PROVIDE UNIFORM SUPPORT UNDER BARREL.
2, HAND TAMP UNDER HAUNCHES.
3. COMPACT PIPE ZONE MATERIAL TO 95% MAXIMUM DENSITY
EXCEPT DIRECTLY OVER PIPE WHERE COMPACTION WILL BE HAND TAMP ONLY.
4. PIPE MUST BE ANCHORED IN SUCH A MANNER AS TO ENSURE THAT THE
FLOW LINE IS MAINTAINED.
900
DESIGN
JON
a 2P�1
:: � Cl TY
o06-21-11
LINCOLN AVE NE AND MONTEREY PL NE ��'�°:
RENTON PAGE:
STORM SYSTEM REPLACEMENT DRAWING NO:
Planning/Building/Public Works Dept. C3
_8„ PVC
OUTN- IE--
1.05:37
T M IE
110.4
8" PVC
IN S IE =
10 5.57
v '0
125. .......:............... ...:.:........... .....:...............:.......:...........'...:...:.,.....:..........._.:._.........:..._.........:-:":":":":":":•:-:•:-:-:-:-:-:-:-:":-:-:":�:-.•:•:•:":•:•:-:•:•:•:-:":":•:•:-:-:•:•:-:•:•:-:•:•:-:":":":":":•:-:":-:-:-:-:-:•:•:":-:-:•:•:•:-:":":•:•:":•:•:":":-:•:•:•:":-:•:-:•:":•:•:•:•:•:-:•:•:-:•:•:-:-:•:":-:-:":":":•..:-:1.25-:-:•:-:-:
......... :......... :.........:......... :.........:.........:......NEIN-�B-2:54....:.........:...... ...:.........:.........:.........:.........:......... :.........:.........:.........:.........
:.........:
::::::::::::::::::::::::::::::::::.REMO�/E:EX: METAL:YAUX.T::::::::::::::::::::::::::::::::::;::::::::::-FOG •:: EDGE OF.:::::::::::::::::::::::::::::::::::::::::::::::::::: -:
:::::::::::::::::::::::::::::::::::.RIM EL:=113:40•::::::::::::::::::::::''*'*'::::::':::::::'''*''::::-LAN :::pA1rElEN�::::::PROPER. -"::::::::::::::::::::::::::::::::::::::::
.........:.........:.........:.........:.........:.•••••......... NE4 3Q"•IE=1�Q.40.,......:.........:.........:.........:.........:.......•,........PROPERLY:LIi�E:****.---:.•••.""" ,- „--,:..... ,"
:::.::.•.............•......... ............................................................�..........................::::.:::.:::�............r......................,._.r............�..........................�.....-.............-..................-.......::.:::::.::...................................................................-.............-...............-.....................,- .::.:.:::-=::......-....�....-.........-. ......................E.......,
�........�.........�:.:::::.r...........�:..�.....�....�....::: ..................::....... ....................4..:...............................:............••.••.••.-�••••�•:. .....-..�.�......••.••::....•.••.••.••.••........:.:: .. .. .. .. .. .. .. ... .. I ...........
........•...:.........�.........
..'-....::..r..A..................:::�..�.�.. .., ..-...-.................:......�-...........................::.
.....�.•................................
....
.•••••......•••••.......... ...... ..... :......... •................................., ...... .............: r -20"
, ......_ ................IEuO�E'AND DlSPOS:OF...: ...... .... ....�r
.........:.........: ...:......CM�N• --.... ......:......... :.........
EL
.......:........EX•EALSTRUTURE--. �.-S1REM
.... ........ ....................................................... .........
.....................
.............:....�.........:.................... . ...:....C./ ............................
.........3a,IE=11,110 - �-......:......... ..........:.........:...........................:.........
.........:.......... �..... :o. .... .. ..........:......... .........:.........
................. .......5...................:...................:...................:. .... ........................,.•:.......................115....... ..............................................•COfFERD�M-FO.......:...........................EX; ................... R/�......... . . . . . ... ...... . . . . . . . . . . .
vt
.........:---.....................�---.............'BYPASSING STREAM ........... ......... ...... . . . . . . . . . . . . . . . . . . . . . . . . . . . .rr.t :• FLOWS -INTO- SANITARY ---- ---
............. --""---..... ....
:.: W ::::::::: ::: :::::: :::::: ::: : :::: •:: : :�:::::::::::::: :....- ------- ----
••.......:..............-- 0.-
...............-. . ....... ............... a �....-STREAK- CI AVI�ELIE='113:10.......:-110E-5.......-......:....-.................--~-::.-:..:
. . . . . . . . . . . . . . . . . . . . . . .
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PROFILE ALONG STREAM CENTERLINE
CROSS SECTION A—A
CHECKED FOR COMPLIANCE
TO CITY STANDARDS
Date
Date
Date
SCALE:
As Noted
ONE INCH
AT FULL SCALE
IF NOT ONE _INCH
VERTICAL: NAW 1988
HORIZONTAL- NAD 1983/1991
CALL 48 HOURS BEFORE YOU DIG
1-800-424-5555
EXISTING UTILITY LOCATIONS ARE APPROXIMATE, NOT ALL UTILTIES MAY BE SHOWN.
CONTRACTOR IS RESPONSIBLE FOR LOCATING ALL UTILITIES.
GENERAL NOTES:
A. THIS PLAN DEVELOPED FROM BASE SURVEY FROM OTAK, INC..
B.
C.
D.
CONSTRUCTION NOTES:
nl INSTALL BIRDCAGE OVERFLOW ON TOP OF TYPE 2 CB.
SEE STANDARD DETAIL PLAN 234.20
O2 INSTALL DEBRIS BARRIER ON BEVELED PIPE END SECTION. SEE STANDARD PLAN 223.10
O3 PLACE 18" THICK LOOSE QUARRY SPALLS
0
0
0
TYPICAL TRENCH BEDDING AND BACKFILL (NTS)
TRENCH EXCAVATION
PAY LIMIT 7'--0'v MAXIMUM
SEE DETAIL FOR PAVEMENT PATCH
a • . a "q • ° BACKFILL MATERIAL
° a'a WSDOT SECTION 9-03.19 BANK RUN GRAVEL,
OR NATIVE MATERIAL IF IT MEETS SPECS.
d Q
A-
d
A a ° PIPE ZONE MATERIAL
WSDOT 2006 SECTION 9-03.12(3)
° GRAVEL BACKFILL FOR PIPE ZONE BEDDING
12" MIN.
r :• NEW UTILITY PIPE
6 MIN ...
OF UNSUITABLE EXCAVATIONITABLE SOIL {IF NEEDED}
d DEPTH AS APPROVED BY ENGINEER
BACKFILL WITH FOUNDATION MATERIAL MEETING
a• WSDOT SECTION 9-13.6 QUARRY SPALLS
NOTES
1. PROVIDE UNIFORM SUPPORT UNDER BARREL.
2, HAND TAMP UNDER HAUNCHES.
3. COMPACT PIPE ZONE MATERIAL TO 95% MAXIMUM DENSITY
EXCEPT DIRECTLY OVER PIPE WHERE COMPACTION WILL BE HAND TAMP ONLY.
4. PIPE MUST BE ANCHORED IN SUCH A MANNER AS TO ENSURE THAT THE
FLOW LINE IS MAINTAINED.
900
DESIGN
JON
a 2P�1
:: � Cl TY
o06-21-11
LINCOLN AVE NE AND MONTEREY PL NE ��'�°:
RENTON PAGE:
STORM SYSTEM REPLACEMENT DRAWING NO:
Planning/Building/Public Works Dept. C3