HomeMy WebLinkAbout03848 - Technical Information Report ZK Short Plat
LUA13-001564, SH PL-A
U15002516
3402 N E 7t" Street
Renton, Washington 98056
K.0 parcel #801110-0025
Technical Information Report
January 5, 2016
Prepared for: ;
Chris Pressey '
P.O. Box 40173 ,
Bellevue, Washington 98015
(206) 769-7662
Email: pressey.cCa�gmai/,com
L. �
�, o�w�s I�'
Prepared by: �' �
�
m x
Offe Engineers, PLLC ,�
Darrell Offe, P.E. r��eo �
13932 SE 159"' Place �+'8�G'jSTER�'�1�
Renton, Washington 98058-7832 �I�NAL��
(425) 260-3412 ofFice � � �/
Email: darre/%offeCa�comcast,net � �
38�8
Table of Contents
• Technical Information Worksheet
• Section 1: Project Overview
• Section 2: Conditions and Requirements Summary
• Section 3: Offsite Analysis
• Section 4: Flow Control and Water Quality Facility Analysis and Design
• Section 5: Conveyance System Analysis and Design
• Section 6: Special Reports and Studies
• Section 7: Other Permits
• Section 8: CSWPPP Analysis and Design
• Section 9: Bond Quantities, Facility Summaries, and Declaration of Covenant ,
• Section 10: Operations and Maintenance Manual
' ' City of Renton
TECHNICAL INFORMATION REPORT (TIR} WORKSHEET
Part 1 PROJECT OWNER AND Part 2 PROJECT LOCATION AND
PROJECT ENGINEER DESCRIPTION
Project Owner: Chris Pressey Project Name: ZK Short Plat
Address: P.O. Box 40173
Bellevue, WA 98015 Location
Phone: (206) 769-7662 Township: 23 North
Project Engineer: Darrell Offe, P.E. Range: 5 East
Company: Offe Engineers, PLLC Section: 10
Address/Phone: 13932 SE 159th Place
j Renton, WA 98058
425 260-3412
Part 3 TYPE OF PERMIT part 4 OTHER REVIEWS AND PERMITS
APPLICATION
Subdivision
n DFW HPA ❑ Shoreline Management
X Short Subdivision ❑ COE 404 Rockery
C Grading ❑ DOE Dam Safety Structural Vaults
❑ Commercial
❑ FEMA Floodplain ❑ Other
❑ Other
❑ COE Wetlands
I Part 5 SITE COMMUNITY AND DRAINAGE BASIN
Community
North Renton ��
Drainage Basin
i� Maplewood Creek/Cedar River/Lake Washington '
Part 6 IT T I
S E CHARAC ER STICS
❑ River 'i Floodplain
� � Seeps/Springs
' -' Stream
, ❑ High Groundwater Table �
i LJ Critical Stream Reach
❑ Groundwater Recharge
❑ Depressions/Swales
❑ Other
❑ Lake
❑ Steep Slopes
, Part 7 SOILS
Soil Type Slopes Erosian Potentia! Erosive Velocities
i
SM 5— 10% minor
I
� Additional Sheets Attached '
�
,I
Part 8 DEVELOPMENT LIMITATIONS �
REFERENCE LIMITATION/SITE CONSTRAINT
❑ Ch. 4— Downstream Analysis "Limited Dispersion"
, C! li
❑ �'
❑
� � i
❑
❑ Additional Sheets Attached
Part 9 ESC REQUIREMENTS �
MINlMUM ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS II
DURING CONSTRUCTION AFTER CONSTRUCTION
❑ Sedimentation Facilities ❑ Stabilize Exposed Surface ,
❑ Stabilized Construction Entrance ❑ Remove and Restore Temporary ESC Facilities � �
� Perimeter Runoff Control � Clean and Remove All Silt and Debris I
❑ Clearing and Grading Restrictions ❑ Ensure Operation of Permanent Facilities
❑ Cover Practices ❑ Flag Limits of SAO and open space ,
❑ Construction Sequence preservation areas � '
� Other ❑ Other
I
� ..
Part 10 SURFACE WATER SYSTEM
❑ Grass Lined Tank Infiltration Method of Analysis
Vault
Channel ❑ Depression 2009 City of Renton
❑ Pipe System � Energy Dissipater � KCRTS
❑ Wetland X Flow Dispersal Com ensation/Miti ati
� ❑ Open Channel P 9
U D Pond � Stream ❑ Waiver on of Eliminated Site
rY Storage
❑ Regional
Detention
Brief Description of System Operation: Catch basins within curb line of street will convey
runoff to existing City system downstream, limited dispersion of houses, perforated
pipe connection to storm system, and sheet flow dispersion of driveways.
; Facility Related Site Limitations
IReference Facility Limitation
Part 11 STRUCTURAL ANALYSIS Part 12 EASEMENTS/TRACTS
Cast in Place Vault Drainage Easement
� Retaining Wall ❑
'. X Access Easement
; Rockery>4' High
� ❑ Structural on Steep Slope Tract
❑ Other ❑ Other
Part 13 SIGNATURE OF PROFESSIONAL ENGINEER
I or a civil engineer under my supervision my supervision have visited the site. Actual site
conditions as observed were incorporated into this worksheet and the attachments. To the best of
� my knowledge the information provided here is accurate.
i
2 - J Zols-'
Signed/Date
— ,
Section 1: Project Overview
The proposal is to create four individual single family lots from this 28,668 square foot parcel located in the
Renton Highlands near the Renton Vocational College. The property address is: 3402 NE 7"' Street, Renton,
Washington; King County Tax parcel #801110-0025. The existing residence, impervious areas, and garage
on the property will be removed to create these four new lots. The property is located within the"existing
conditions"area of the drainage basin map.
There are no sensitive areas on the project site. The property has a gentle slope of approximately 3%
towards the east and towards the southeast corner of the property. A Geotechnical Engineering Report has
been provided for this property. The soil test pits were evaluated on site and determined to be fine sands
and grayels. The soils were identified by a Geotechnical Engineers as"Vashon Glacial Till"(SM). These soils
are not suitable for Full Infiltration of storm water runoff. The soil logs indicate moist silty gravelly sands
with no ground water within the holes at 7.5'. These soils are suitable for"Limited Infiltration"as identified
under King County Surface Water Manual Section C.2.3. The drainage calculations within this report will
show that the developed runoff from the project is less than 0.10 cfs during a 100-year storm event between
the existing runoff and the developed (mitigated) runoff. Based upon this review and analysis, the project
will require water quality treatment for the on-site pollution generating impervious surfaces (PGIS). A storm
filter vault designed by Contech shall be provided on site for water quality treatment. The Gty of Renton
has granted to Drainage Adjustrnent for this project: (A) Pre-settling prior to the fitter vault will not be
required; and (B) water quality treatment of the frontage improvements along NE 7"' Street will not be
required. The approved Drainage Adjustrnent can be found within the water quality section of this report,
Section 4.
Summary of Developed Project BMP's (Best Management Practices):
EACH DEVELOPED LOT;
(A) Restrictive Covenant to 2,600 square feet of impervious surface; and
(B) 6" PerForated pipe connection to the storm system; and
(C} Sheet flow of driveway towards landscape area (preferably lawn); and
{D) Either 75 feet of"gravel filled trench"OR 230 cubic feet of'�dry well"for 1,000 square
feet of impervious area
{E) Storm filter vault provided to treat PGIS
� ..
.�X . .
wll�a�5�s_�[� � ,�� �, � .. !c �,.. ��.
� � � �
� �
_ .
( � iti' � �. „� r
�����! �� m� � ■■� �,'r
����' � � ,�! u��� .ut�u ,,.�■ '�: � :
-�� ' �� �� �a �f�lw�� a� � • � �
� � �i.l�l�l�!!� � � '�� :
� � �j
� ��
� � �� ! -�
�� � �c�i��p�� ��■ ' ` '■�j� ,�,N � ` ;� �
�!� � . ��� ■iw�A�Ei !1l��i 1� ►'� �
����r . -. # =` � i �L■s � �'��,� ;; : • �,��E
� .■�� � � � - .� 'i '�i '� �` �■
.�. � � ��r i - i s.���� +�!�a��3 �� �
� ���13�'I lT� •_ r� �� I/ "i' r�;I� �� � =r � r
�
__ , _ � si� !�-
� ' " � � � � i: .`I����[�t� � �� �s-��� _
- ��II�L'1��r� . ■ �,313li+1ltR�i�s � �■■����� �:
� � ' �� � :�,,,. i� r� ur���#�li� ! r1l�iifll[11� �'" l�t�r■ �#il�.
���E�i: u�E
. �.11111111■ =� : � �� ,, �. r ynt����� ��Q�� �N��r��� .. �.�� �s.
�,'. i��������rr i�� i�f.'t� 3+►t� a �� ��#�ii� �fl�� =�= :�� � '�4 �� 1 �i��
� ,r�l���#If)� !`■ �� 1 ! A � �Rs i� �w � �r� ✓ �
r,+�i�i#f� .�. �,a r� s� �� � � !� r r '
�� �� 1� r� a� � s ��''�, r�`�-, ■� � � � . � � _
� �� �w � � �j e� � �� � ■
� � �f�1'/ �� w �1 113 3, �ta � � � .
� � ... _
] � �� � �. �= A■ � �� ��� ���� � � ����� � ■.�
+ �a= a� �a -• � il/11��/1'_ ��
s �� � �
� , _� �� � � - - � �
� �"�" �; �� �� �'�, � - i 1` � '' ��� -� ���..�
�
�r�-- ��,.,�' ��;�:� ���i� ,�� �i ��i��t � ..
� ._� i r� .. t�i��� ,�a�..
� R� � �E.� ���� � �ia� '� ►'�.r �r, �7 ..: ,. ,�,; .� �1! �
��■ � � �rG:�.,. �
�� ���!� � �� • ' � ���t � �ItZ��i�l �;�����.� ! � �.1��� r��� �
�i� �� � � ���" � ���.�wi r�%���' i ► "� C � �/�/i�� � �sE
s7i �► . M �ti �+�. r/. i� �111[T#!1 .x �.. .,,. : R+ ��
! �� s �'� � 1114!`�f�G •� 1 � "� � � ..� �� -
�rr � � � • � 4 .4 � U� � __
�r � �'��`.?! � �� �'� ���� 'r� � C� � � �.
�^� '�' �� � '�r�� � 3 � ��� � �� � ��l7 �� N�����{�� ����fM���h ���� i � � �, „r
�y�[!�� I,�,,,._� � � � a I�IiN �-1:%I�i�111t �1l�I! � =Li �� - �
� � . ��*�� �f �� �� �i/�� �Il�ii�11`i�HIl111 �����_�!!� � i
1��r �„ � � � ,, �+ ��: ■�- ��..r_� ,� ��� '�
� �`i"r #-�� ����I�f i���+' �'�"F��; � � i�� �t1n'i .T'si� �,tfEl� �I�trr �F9I�t.'I`la'
� o �.r �''� ���IIU • � �
�� � ����N� ■ r�
�r w■ �r �+�s. �`� � :.«. ��i �r�.l�i� �
' �� � N� � �� ♦iYi+� � �i =�E■ r��� �
�,.- Tf s� �r,� �1�`t, '��'� �►`� � ; � t��r���� �
'�:+ �■' i � � �r'J �',�' ��" . 'nu�um
� � �
� � # �� u � � _� � + - Y�
h AJ . r�
, ■Hqtl�tc��t�����' ���� _ � �ii� � ��,
�
� "�'■ � ��� ��� .
� - ��,��e� ,
.���,�� r
,� �t."��i�
� � ���i��
��;��,�it�• ..� _�
-
� � s= � �1� ���1
:-= '== � ,.
' � I�i�
/� _ �r � i •�
' +' ~ _._ • �� �r
+`l�lt�l
� ,
• • :• .•1. �-• -
u � :� � � �� .• •• •1 1 •: :1 •
i
• • �
Section 2: Conditions and Requirements Summary
The project is classified as"Full Drainage Review"
An overview of the Core Requirements is outlined below, further discussion of these requirements can be
found within the remainder of this report.
Core Requir�ement�1 —Discfiarge at Natura/Location
The current property sheet flows towards the private property to the east. The drainage flows across the
private property then south into the City of Renton storm system within NE 7"' Street. The developed
discharge from the project will be to collect the on-site storm and convey directly into City storm system at
the intersection of Newport Court and NE 7�' Street. This new connection point is 175 feet from where the �
existing storm runoff enters the City system. '
Core Requirement#2—O1'�sil�e Ana/ysis
The property will direct discharge into the City storm system. This system has been analyzed severai times
for projects along NE 7�' Street. The downstream system review and analysis can be found in Section 3 of
this report. The downstream system is adequate to support this project.
Co�e Requirement#3—F/ow Contro/
The property is located within the City of Renton Peak Rate F/ow Control Standard(F�risting Site Conditions)
basin. The proposal is to mitigate the developed runoff by using limited infiltration trenches on the property.
The developed runoff is less than 0.10 cfs above the existing 100 year runoff—therefore no stormwater
detention is required. See Section 4 for calculations.
Core Requiriement#4—Conveyance System
The proposed on-site conveyance improvements will include a new roadway with vertical curb and gutter
located on the downslope side of the property, east side. The gutter will slope towards NE 7"' Street. The
drainage from the project will then be conveyed into the existing City storm system using catch basins and
pipes. The overall project will generate 1.26 cfs from a 25 year event. This flow was conveyed through the
shallowest pipe on the project being a 12"n-12 @ slope = 1.00%. This pipe could convey a flow of 3.75
cfs. Therefore, if the shallowest pipe on the project can wnvey the total 25 year event then all other pipes
are adequate. See Section 5 for calculations.
Core Requirement#5—Erosion and Sediment Contro/
A Temporary Erosion and Sediment Control Plan implementing the Best Management Practices will be
included within the Utility Permit submittat. The project does not exceed the State requirements of clearing
over 1.0 acres in size.
Core Requinement#6—Maintenanae and Operatrons
The Maintenance and Operations for the ZK Short Plat are included within the Covenants for the individual
BMP's provided on the project. The proposed storm system within the public right-of-way will be maintained
by the City of Renton. The onsite storm system will be maintained by the HOA or individual property
owners.
Core Requir+ement�7—Financia/Guarante�e.s and Liabi/ity
The Financial Guarantees and Liabilities will be required prior to the project being finalized by the City of
Renton. Bond Quantity worksheets have been provided within Section 9.
Core Requirement#8— Water Qua/ity
The project will be required to provide water quality treatment. The onsite PGIS will be treated using a
storm filter vault designed by Contech (preliminary plans are attached to Section 4).
. .
Specia/Requirement#1 —Othe�Adopted Requirements
There are no other adopted requirements for this project other than the preliminary short plat conditions
which are included within Section 2.
Specia/Requirement#2—F/ood Hazar�d Area De/ineation
There is no flood hazard area located near this project.
Specia/Requir�ement#3—F/ood Protection Faci/ities
There are no flood protection requirements that affect this project.
Specia/Requirement#4—Source Contro/
This project does not require a commercial building permit or site development permit therefore Source
Control is not required for this project.
Specia/Requirement#5—Oi/Contro/
This project is not classified as a"high use"traffic project. Therefore Oil Control is not required.
Specia/Requirement#6—Aquifer Protection Area
This project is not located within an Aquifer Zone 1 or Zone 2 area. Therefore Aquifer Protection is not
required.
. .
- - - - .
. �••�
� ..�...
� �
� s::�
� i
�'
{. .�. ��
•. .
��it���a`i�
.t+�5.�'..��Q.•�
�!��. ,�
►: . .t�.�
���',y: o�► L `*��w.�:,.�
.���,�''' • `., .�irio�����i� 4+�+.�i�\
;�° � ,°�.��� �
� � .' : �'►�� �J.r • ti'� �
4'� ' ��••.����i'i'i '� • o
,
��! '�°iy�i�i°�O�s������ie �� �� d��iS
�, r�. � ��.�� ���r-� • ♦♦ ;;✓ .�4�'•
��:��!%'�a►� �i, �° .ti�i�i�i4°�ai' iti�� ^��
�,_ ��►•��• ;��iiJ���ii�i'ii'J��t.�
�'t.'��'i�'��p�0i����►����i�i • �
:�''�;. �� �
/ �:��o.�..•��.:�y'.;.;.��, -..;•;; �
!�►�R'�D'���tL� �.�.
��
� ��Oi
_ ��`..:���
.�� ����'��i�i'�i'� �
��1�����'i�i�i�i�i�iW♦
�► �+► '`i- �'�6yis�wt�'��'i':
�i�'��''i`:�•` �'Cii�aJ,• • �%��iw��
. ..: '��.•a.'l':+.��'������io��`S
•�/.. o ♦ •��•
�����v i ♦ • ♦ ♦���
� i,�s,;/� i'i •..s� �.'►��.�. ���
�' • `+ : ��i�.�c��:��s'►����i`�i'
�♦ a ♦ •• �r� �Ji�i��i'i�����di
/ •• a�G� ����:�:��r�•�i:���i������
�. ♦:��..�����
e ` �-.- � •:�• ♦ ♦
� �'ra•. •,;�:;►.;. `�`�'F► L`-.••�,•;•�. `
. , d� • .•�•o•� �
� 'i� � �a'-,��� �►;�O��a��
9 . ��:.�m.-.;�q•:.�4.
--•.� •.:�•.�, . - .
,.,_,_;�.,.� - ->�
..:�o• �
' ���i'i'Di'i��i�i'� `;�9
����������������� �� �
� !�i�i i�i������0�►� ���% ' �
�.E_^,��r�>,. •!�%Oi����� ���y��`` ' ♦
aos `Oii����a!�i��i��i0•`;�
'Oi�i�ii'i'Oi000' � •�`
►�����������0
�_. 405 ��� ����O�����������♦
�ii>- -' � r •••••••••••••�••�♦ �
��: ♦���'��'!i
_ �� �� ' .
�
'
�
r � . �
��
s ���.� ►�
�r .
1
� �•'�O��o 'yi�ty�p����•►� i�'O�'' `A�-,��i0`'i�
� �v►++�:�5�`i!�i.�i��.,+4.. •'. ♦��•
i i!�'.,�.i�i���ii�i� � w�� �i���►�►ios�i�i�i'i�'4'`�i�'i��'•�'ti'�i'0i'
• 90�i`� �r��♦ ��������♦ ����i ��Oi���i�
i�i� �i��6�i��`�i i'���a����yi i°i ��i�'i:�%����Oi�
j: �i�v4���i '�i►♦ e♦ �i�����0.
0s�i�►�y.4 s�. e ��������ti�
,� °i�i���� �!e`�.�`'� e�i�i������
�i�����9 �►�`-� �'�i ��i�i�i�i�i�i�i
•�� ►�r •�o♦ •�������
♦ y°i C �i� ����r,s��������•
` � ���ii�i�i��s'� O d �-�i•iO�:.�i�����d��i,
� y► s�i,�'.<._.;. p� .�.�.�.�e�.��.�
�• �`�i ��i�����e�s�w!'+�-+ ♦�:0:���a 'i�i'R'i�i'
.:� S• �i!i •'O�L' ♦ a�� �i `G=. O �����
�._-_ .w���a�•aa�►w���>.s�sl�!�s����
�. - � �• � •
� � � � � � � � ' �
�'� � eriton•
� �►� _ _ _ V
,.�:�:_ .
Section 3: Offsite Analysis
The downstream system was walked on February 4"', 2014. This downstream system has been reviewed
and walked several times by OfFe Engineers as part of four other projects within this basin. The site
drainage currently sheet flows across the property to the southeast corner and off site to the east and ponds
within the property to the east. There is an existing 6"concrete pipe (#113104) that conveys the water
from the property to the east into the City of Renton storm system on the south side of NE 7th Street;
CB#113106. The Developed Condition for the ZK Short Plat is to bypass this ponding area to the east and
directly connect the storm water runoff into the City system on the south side of NE 7�' Street at the
intersection with Newport Court NE. The catch basin located at the Southwest corner of this intersection is
identified by the City of Renton as CB #113105. This catch basin (#113105) is the confluence point for the
existing flow and the developed flow. This bypass point is within 250 feet of the existing discharge point of
the property. The drainage system is completely tight lined (within catch basins and pipes) from Newport
Court NE/ NE 7"' Street through the City of Renton storm system piping to an apartment site, Hilltop Homes
Apartments downstream. The network of pipes runs 930 feet to a storm water pond within the Hilltop
Apartments. The City storm system was visualfy inspected in several locations downstream; at CB #113105
CB#113106, CB #113100 (end of street Newport Court NE), CB #113112, CB #113118 (NE 6th Place &
Newport), and CB #113041. These catch basin numbers (CB#) are from the City of Renton storm water
maps. The downstream system consists of 12"concrete pipes. There appeared to be no overtoppinc; �� �h;-
basins or capacity issues. The roadway area above these catch basins had no indication of overflo�v or
ponding.
The storm water runoff enters into a pond within Hilltop Apartments, City node ;.145531. This pond is
heavily over grown with trees and blackberries. A walk of the parameter of the pond shows no signs of
overtopping or erosion. The parking lot to the south of the pond is about 4' below the pond berm. There
were no signs of overtopping in this area either.
The drainage flows from the pond and enters into Monroe Avenue NE about Z00 feet north of NE 4��' Street;
CB#113645. The storm system is within the centerline of the road and was not inspected. The storm
system continues to the south in Monroe Ave until it enters the City Shop Area at NE 2th Street. This system
downstream of the pond in the Hi�ltop Apartments was not inspected due to location within Monroe Avenue
NE.
�-_ - -
' - ' / I 9 8p�K6t Yl6t 00��0064 : ' , ' +r�a �rraw q,,.2 CA� , i o -... - �-.�i
SLZ" �--._�oo� ��r''_�4'1'1_,_..�,.:� !�,! I�'��""a ,. _ � �� "' �� � .s.. : � �
__. ..� �
� � .. �.-�.t,, �i z
to � u� ' ,� . � £96$9L—. � ;,�p���,! .88�1{Sbl_—_:�_ _ _ -��seoe� isc
,,� �
,o,�, ioe i ,:.���� � �= o� r 05 ' ��� .�s l£8541, z :� � .� - sc
, � 66d - 1 � � �-�I�� s�.�:o�;.� �� �sss'���� : ��; o�.:<: ra 'i
� � �
�� `"..,,_F;r s � YZ l BYl9El }�5Z � ��. � _�15" � ��� :009� ;;, �0°1:
�
;-" � � /�S 1!"J� z�l �- � r �,,;;_. .�r ..��
cc_r E ... �,s sc c s m6t! � � SS9El- J. -�'lSZ9£� '� t ��� I� ■ �^ • ..
-LS9Sl � i �� �,_.,.,.... .. c r�'+ / lZ Cley,. '�s .�s �'� !, ---
�t� � �+�� --oss � _ s ��� � n�.a�cs�cr7�esce z � zs l,,�uo9_;s / ao"s+ , ,
-•ZZE frT� � 19� Z9S9Cl. e c r-, s ,
•.�� l �,�s� _ �,�- �►s°� e' z�i ~e s�t �� j ���9���C51 '� _ . ;,, �oos' --�teeet�� �seu
� zs � �' � I:� c���- � s55 �l �: ! � m ,�"3 � � 'os _ � ,n: ��a-�, �;oas�:� � � ;
� s� �l�,��o►_. 4={ I �� 4, 2 �� v
° zis� --�� � �°uq o _ _ , m
`n ��e ze��� ''��B�, oo��� ' � � �'�' ' ��'s`ie iT' a x� � _�ra� weE� i y� . cn
i, i � ze c �1 t s Z9f 4SS ;'iy � sq'- ' � � , '
� r�t�-)ZE Zfl �-�-'-sss§ei� �,..�: m � i�3_' ��p I �.�- / � � _ fA
�e��c� r�s�e�� �� � �ase� e�s�� ��sse� cs � ' zs9 �
-- � I - �, . vz � �� C' � - �-sroeu _ 4\ r�s � x � I i o,� � i
a - t�`�� � ��rzxr �-�t'�- -- .: �� �
� .-� l 0't� rrm q =o of cec� I . I\�/ �o�'e� 8�4 j� res � �� -�.i � u: .:,e89oCu 1 `. _ .__ ■ ■- � �
�, _ � �
I �I , �'Isasc�s�ot6C�ee fcBF ae ��u� c � ess i g . 9 csa��..�� ,--�--�- � LE [
_� _�_��.. ._'. �.:: k:� I, l I Srs:� I e i�� 96 ll 9[s . �� " �p 6611 �
� ��b� � � �
� j'� � 89�1 i I —=�4Z�C1 1�419 3N � --r- - � - ' .r�.{ � 4[9 _ 9f l '.
` � � Lt � I��^�p.r-��* I^'�i L l I ��-,�.� i j a:. I -� —`*'BCOCI ll � : -,
~ �w� ?�I .-.C28C7� ' a ,' � .
� 6£E4Ll �9690E I °' , l „� �.�"�sc? F'4`�+s... �� � f ,.��� Ku ,1Et:'Gt�� �iL Fs�sc s`.,. � -I � I�as'e ' i t,o' ! i ���q socc coEc � � N
_.
� � 1 --J � - � I�,.. 0�9f1 scsc asc �_I � "", _ � l� � .d- I I � �
�
� fB9El '- �_. � ; � :_.�= (�
�680f1 L68� � _ _ ._. I � �` ZZ64Cl � < —' -' Z '
r3.i::>V. t � -0 lt m --- =°�' Z
W '� �91 -� !R�- - LZ66El_ '
� 7�.�-I -'�� � 9CLSEl(�y!;�rcwc VfbSEI Ti -T- i --YZ ,L6 l �7
�, 1"�' OZ6YCt �l�l -1- I
yy��� �� 4 _'� � . ,BC g�p�6tl b1 Fl5f'- � I �k � 40f l4 � � �+. � I O
-I 3 �b'1 � �. �" �a ' ! �-�;'eI9. � �f t� �� � �k�C �'""";" � Cn
lal ' 9� Lf ►C 4.�C 1CtC L LLCC BLCC �tC,�oLC'�
Z � �I . - 0e ° bbp '-L_� � �_1+�� � J . , _ A I - Ye��� ��9 i � ' ��'�y t'� I �� i f 'i m ,
M __L��i �e_i^ ��A � I ,. __ F � �'� i � ��� j ..� �� � � �5i� 1- - � _`' - -+----r-�---J , (n
IEZSCL �o ,�{'° < '
f-N- 9 - zdei ta tSC c�e �e I 9u�� �i pei `'+�i � I __L���?�,�'-I�.9. 9 'WpE 4 � '�r-,��..c .. �� tt� <
aiTc �x �c otE tcec u tcc �o�cE �
O . . .:LIB ' �1�e. 9 ;iYt �• �� - �.. 6 k L I �. �..I ;-= I �
`- ,¢9""66(� �..��s i EZ�I ��!ti� ��e 3' � Id �i � t<<ue 69E1 6fi6f1�_.. .- - -- -- � t
� " ,. 9 + CI I�.,i �: :; ��. � � —�� eu _ � l ye n�sa� z ` 9Z69£t ,
i i.ts � w�c . s �i �i� ,
—..� � �{� �"' 'tst t,6c � c[e' _ EI60Cl t fT-5-I(_. �_ _ ---� -_,
,�- .;� � w� ..�1� � �w�f,5 ' � aG L[I �l � �\�g c s� c Bll Y OCL'"li 98 (""� c�ccrte�� ci � f�
� �t � ,.+�i �d 41�. � 99 L� 4�9 0� � I � - �� � � I ,
� , I �
tD - .�FBB ���`s � N 98� � � � 99 f ' i a ' �/ o c Z��� ��� ��, �� � i .�—_ I�'�_ �`ZSZ6 ! A
� �_-1 � :�� t�� �� � � � � ,r �
W � �;r R� i e � ' � � � �
-t8�9t t��_ � ,zl6c�g m i 98�� _ }� � itn�,�Y �/�/ �\ \izfc ��.,�.:a tccfOeeciRrc�[t t�cc j 1
l� t � �. .l,�,l 1� � I �
' 1�i`�• sT � <l�� ' � � . f g L �, �°,.'_`�/ B9� �, ` ; .�.`u tt �ei����3�N .-�, ,
t�t �I� �� om i �, A '� 4 p / � - — --=—' i '
a96�91 S669L1-£L6LLL � ��Y_��,,„�-'{+1, � � '-.�1 �• - W � ��,_ �� a� , 'OUEtt _ 6Z61£l�
r%P _ 9Gk��l �•=� I[y'7 z� _L9fi. I o � _- - qa3 �!��- 4 aaf �1`� �" Ce t["? � i1�r�� I �
LO60fl g(, �9�96t1 LZ9Cl� � m N a i �����c43" y.' . � y: �� o? '� -•� = o�6tic 'cthscfi Icez�cc�a L t
ibio► t- . � ,\+ �' z+ ; � �., � � '' � � J
� �. ' L„y�9 A t lL� �—' ' - _, � �
$ :.,_�• ��,,�, �.,�\ I ��is � . .I � _ ...�r.',. .,..r` I ; BL ll i
� [L9.,�I �/�� / : ,z� C6 ll�6�fl .� � i�5s� 4a:�', �/ot 1 � '
6tY �• � � °� , m '�'s�---�\,. i I � � -�tztE � 68 ll � � �z s
�--` �-�`��' ��► ►�, � 9s ' -�C�'` _ �4 � ,,,�;`�� i � � ✓�I u oie^�� I + czsrc� �
,; 1 �z_ F„�•'- 1;�� .,.,�.�+ �s z� � �"` � i ,�^ � r ir�sc
�o Y � � 1-- 1 I�fw,�"l! _�� - i i � i�{ie f x.: .� � y�5��� � �� � w� �I I 1
646 1�-- -�--L- I 1 '1i4� �� � 9 i4 : ! 9t � '^r:t i �'�' !L:id I 4$� �T`'
7S UlL 3N � • � ti Cti's _ �, t , oec ( � I
Z869t -f6A9tt-��! � b[ j�� � ��� � � I �.. . I I �� ' !I I ., dc� i�I '
- ���ilziel oo` o�Y i�tz_. �� � at . � _ _ _�.�_ .�[ -- - � E64f1
� -1----
+�.� � �*h ' � �' �' ._.6ZZSCt���8�`9►sZ9� `�'oi6vf�0 �S 41L 3N ro�f tt � Z SLl-� �
'�_{�I � ��,Ol6LLL % eoe� t � • ✓ �� -r- - - - .___..._ 41L
t �� � /i � I ( U".' � t6t i�'' � �^I 9 ���{ -T__I �-- i 'T 0�4f1
� f �1`0�► �►r � (�oii �-��w.---� e eac� ' �c � �i r; �s � „a y��: � '
o �6fSlE �o� �/
_*��.� � � �� ��',�'- � �-'� C,�^•y ��_ . �8064E[ �9S1��_:Ol9C � . OBC��t �� I�'�"^ � I i .ZZ9C i I i
Ol08Btl Lll lSSICI ; Oor _ u � ` �� �7 9;� �i YSL� ; �� I s � , n� _ - , '
1 I
�--" 6fl :e � ` r`�� � � .s i
9�-056 t � 3N ` !r; ., -u ; 0 C06C1•f('�OQy I �i—r zii'� `-a6�`� i i 909E OZYC ptT tfL � fse �s 9fl
�ss�e��-�'� �-ezzse�----- �a i ?j ' '�, ; ' � t , '
,.� _�` °m ' ce; I i � � � i I i r*
i� I �`R69�'crio�;��o►�a��, 1 ��--L j ��� J z��ti ��� i i si[�`��lL� I I � � a. --- ---T ! � I
��r e � ` I `!z'f` � �� I � � +�j I n� j �-�`i ___j i ' I i i � 1 � I �I�i`�,� s� ��` �
g�� � -��y
to1`�,,
e�� cv u I°� �9izset ��� \\ ��'� J � � _I �� � I���I c.s l�o�ac��',-`,� �c�,�.,..:,r� ""'�!"�"`i �-�� �'� I��� �z80Z5 �
iz
�,c f��A?� rR {,t�m { t �t,,�'`
�'� �z►z. a� � �°' � k�� _ ��'. I -�- __._..--_--.960f11__ L£ZSEI[6Uf_ll; 1 �.__j_.� 1
�� uc I�Q Z e6
��-1_�_ � � � �;,.� i m tsoe� C� aet es5 �,
I ` �' � oe� fL4 i - oo Y.��; O60E ll� SBOf t tiB�L �L t
�� ' �^I i � � 7a� i �� rg�: �on� � � . �i � � _ I �F�A �� � tt �I� L l '
/�� +�.� � � . �—
►� i 'p�, � ;" �� e«se ' 4'� $� � Y I � \ � i � �' �
� � � � � �
•�,_��� te. � � zt� t � m � .., � Z � � '
�
9�'6d - �/6 3N 350b N£Z160 - 3NS3 ;,,;;�
l - � , - - �{�yy,�
�4 �o� .T. ° r `�� .�a"6op� .r= �qo � �� �����J t � �18243r�� � I ai�
_ � ` ; '(� 15655 4S�imt��+'�
yr ��:�o� o:.. � ����� , 4 ,�— -
, �
� _ , � . 621�� _
� ; 'r�. •.soo..- 1'sao �� 145531 �� ..Auo�,,• t�'�; I�st> �_1 62 5 4�36390i 2 9 � I ��4 � � w
t � _ �--.'.'�,:''%� � � �'soa� ■ �1i45831�,,�1 or � -- � ��� • � ��� ,.;;� � 1ti ���a
� I3995! �_-�_�--�_._ __—--i-- ��- ---- 145488 :h �4 _.- - ---� i �,, : .,h --- a o�---
i � ` �6$9.5.3
� � �a� ` 1 � s.: �� W 2 0 ��, ■ _ae �,;,� 63,`. ie �! I `I �soo �� �sa° 1 •�75
� I � �? s x � � c�n �.,, i �� µ asoo i �ie zc s� _
. ...
I r,�- � i ,�I _18B ���k`'1J6231=�� , �fi �s � � � ' •227
.., ,
� I I ud M�: � --�-���z� .., 145436 -- �oe � �
33 �s:� �' ,,... �,��,P.ti -,__r-��G Fr� �a�-! � � 169 �tb�,-x',• 1»��sy' ��� '} R�7' !°ds°I �'2 �� �-- ' 1
I n30. .� .. i ��m...uo, I�'3 _.�, 146939 � Z'-...1 d.-r-..r'� �sa i � ���ous�:`• cic�os�;�[�o�e!°�
� I�°`•C --- � - - � - �„a, _ Mw�;l � ��o'� � � _ 131559
I ' '�y-�� �n ��° +au�" , --145859 3�ee_: ?�ee;: �3 t�5�o3 136 _'I77JJ8 I
� Y _ I 0 � ��.ZJ� V�:�,.�=''�'ii� ��� ��60� �NY� �,4td � : I
t�s4a u' IF` i � ����• a ;�'a�3� �� xu `+�,F• s�ee 2 ae. ik'i� �
! ,- 16]$ 5--�'�-. 13901^�r y. � _sti IZ!z'' � �::
� ' t � .�. ° � I h.1iU -- ��'� � �. 'ree .ifi2341 � m . �� ..
� y� _ _��;: �u. ,.�:� �' .�.,� .y���'„`.�.r�4
30— H �t �� �,kr> � /?� i �a5z �a�? s�s ui 4aa E
( „303t � � �. � � , / I�a� -..� ,� - f ., . z7ee. �.� , ��a. ;� �{8 L4�
.+ l�0 ; 1
� I I �i �, �40 ��ots � ��et� �sci: � a�ee � � , � ' ��?�?q�177999 -
� x"' !� � t l � .�f : r� � '� � '� �lFi- ��."`Sasi �ar+`� . �,K 1 30�- �a�� -� i� i
� �71 28 � . — � 3612 � 1�W ' �ix�c:�-�. � _
11 . ��; 598 a SeiY°`�' '.-'l� �4C775-. L
I k f � 4 `,13 0 — ��?672.Nt""1 Ku._ :N- _--- I� � L.136237 I 36239 i t.t- r � ,� �'r
� �•,o . ��i �y I�c.'� '. ; ��I 1�i � 1,.,. H,y�.• x:`:. Yg. --a �
13i�t22 � p�'�d°.,.Y `145863 41 F 8� 6io i �` ac x . 3522`� Y aeoo 1 �. i .��a �i� I o t , ' �ozor+.� �� � � i,,_
� � t 2 �.' 135 ,.., � --'-s ?io �:: � 1.454,7.2_� c..�
�13 1----- �.i4��1� au +�r; - � l 11p003
� � 7� B56 - 34785-- -- - --- - �'•�1d1 - --��-- -- `v' ..._ 11 �` I 112882 �1347 4 157dD4.�l�_ N
--n 1 a' - -
� 4 1 413 �t���� $ 117005�`
� 11�360 � � . 49 . 28 1741 414 —_-- - 114i37 133A17--- �760��--���
iu�a3- uai�o_ 146863_.._ �_,���aa2
I ■:'r p� 1152fi9 I � � � •**I�
i �306�� , � k�' - I i �`i � I oeoz x , ± I _��. �ttga?c i3o�o93
(�
� � "": '°, , Greenwood ' _'_'�' __j '4� �a iio =�
� ;=,� I �'.k r: " � Memorial �. � -- , L I � �
i 3az �i � !
, � f�, i
Y Park � � _�__J (
� ' � .�.,�f-
� _.. ; 306a I , � ��q� ' �+�eoi �
. p� �
� o Q� f ; __.__�_. � :. ro � � � . . �ic�-��'�'� 116 54 �fl6953:
I
� F4NE - 17 T23N R05E NE 1/4 - Pg. 72
� et B E e�, . .
� Structuros Culvert(Priwta) Facility ' f � � . . - �_ S u rf a ce Wa te r U t i I i ty
R�nW�Mdnlaf��d Diam�t�r Renton Mdntaln�d •.� �.\ ��31 - �
3 �433 �5434 '5435 54
� ■ Typ�1 GlchDa�in or InIN l-� UnMown � Pond � - .. I� . .J 5 . '� �y: �,�
• Type2GtMaWn-Manhah �'� E-24 • Tank J �� = � - - Asset I nventory
� � Aoceii Rba T� 25-40 _ �� `D 2 �� 1 5306 �l 1 5 � 3 5 02 �5 1
� �J] vaun � �B•tos � : ��� D
8ioswak
� Unknown PI • Public 4 11 _. 12 � 7 `� 10
Prlvably Malnfaln�d p�mnK , P►����Ny Mtlntdnad 1\ :'F,2` 3 a s " . .�g 6 M a y 2 013
� ■ CakhWdn or InNI —� Unknown � Pond 4 � ,L, ~ '� �y
� TYM 2 Gtehba Wn-M�nAob �� S-Y�• i 7ank � 1 1 5 53�16" 15 5 Y 1 � ��
-, :i AcwuRuer �� 25•-�T � Wull F8 �9 . 4 F e
�
� � Vaun �� �o'. • BbsvwM 3�\� � 5320 5321 5 53'� _ � ,
� Unknawn Pfpa(Private) • Rdn G��den ' c 0 150 3QQ �oo
� Unknown Malnpnanca Di+m�br Unkrawn Malnfainenc� 4 2 � 5329 5328; 5327 5326 325
� GtrhWsin w Inbt � Unhnown � �'.,�� . H�4+ I 7 �8 Feet
Pond
� GlchGtln-Typ�2 MH �� 8"-24' � � ' - •
' CulvoR�Public) �� 1s•-48' � PumpSunon 3� 4 3 5�32 5 5335 ' �l 6
Dlam�t�r � � � �St � • �
- ���� � REHTON r'�
-- unknown p��r Convayane� � PM 202 4201 5206 5 O5,' S2 . 520 5202 520 .6�
- �- e�-2�' Conwyanc�Typ� �� � � J \ J j,
toncomour pg T23 N R05 E S E 1 /�
� 25'-�6' —► PiWNnknownM�inQ
— � 19•s —...—. pi1cA
Disclaimer: This inventory iniormation is schematic only.
- It was compiled from numerous sources. It is the best
information available at this time and should be used � � � �
-- . � , for general guidance only. The City of Renton is not
�� ' responsible for errors or omissions. When this in(ormation
, is used for plannina.desian, andlor construr.tinn rn�rnnco� ��w w
Sect�on 4: Flow Control and Water Quality Fac�lity Analys�s and Design
FLOW CONTROL REVIEW
Based upon the City of Renton Drainage Manual, the following steps are required to determine the mitigation
of storm water runoff of the developed project:
Full Dispersion - N/G (no good)-the property does not have 100 feet of flow path available on
each new lot;
Full Infiltration- N/G-the available soils on the property are dense silty gravelly sands
(Alderwood) soils and do not provide adequate soils for full infiltration.
Limited Infiltration-acceptable- no ground water was found in the test holes below 7.5'feet,
therefore limited infiltration using gravel filled trenches will be utilized to treat 1,000 square feet of
developed impervious runoff OR 230 cubic feet of dry well.
The proposal is to mitigate all the Lots using gravel filled trenches/or dry wells located in the rear yards to
treat 1,000 square feet of impervious area; to utilize sheet flow of the driveway across the front yards to
mitigate the runoff from the impervfous area of the driveway; to utilize perforated pipe connection at the
connection to the storm conveyance system within the front yards. The frontage along NE 7�' Street will be
collected and conveyed into an existing public storm system located at the intersection of NE 7"' Street and
Newport Court NE; City ID #113105. a new curb and gutter wiN be installed along the east side of the
private aaess road to collect the runoff from the road. This runoff together with the conne�ction to each lot
will be conveyed into the NE 7"' Street system. Based upon the attached analysis the following flows were
developed to compare to existing runoff.
� Pre-Developed Condition (runof� Mitigated Developed Condition (runof�
2 Year 0.069 cfs 2 year 0.117 cfs
10 year 0.096 cfs 10 year 0.140 cfs
100 year 0.199 cfs 100 year 0.246 cfs
The difference between 100 year"Pre-Developed Condition"and"Mitigated Developed Condition"is
0.246-0.199 = 0.047 cfs. The"Mitigated Developed Condition"runoff if less than 0.10 cfs during a 100
year storm event than the"Pre-Developed Condition" runoff. Therefore, based upon the City Drainage
Manual, no storm water detention is required for this project.
The calculations for the above analysis are located within this Section.
WATER QUALITY REVIEW
The City Manual requires water quality treatrnent for projects that add 5,000 square feet or more of"new"
pollution generating imperious surfaces (PGIS). The proposed developed (PGIS), from Area Breakdown
attached, condition consists of:
DEVELOPED (PGIS)
Access Road 5,424 Sq. feet
Each Lot(D/W) 1,200 Sq. feet
Frontage Widening Not reauired -deviation
Developed PGIS = 6,624 Square feet (water quality treatment required)
Filter vault Sizing: using Area Breakdown: (onsite)
PGIS - 6,624 sq. feet
Un-mitigated other impervious surfaces - 7,450 square feet
IMPERVIUS = 14,074 sq. ft (0.32 acres)
. � �
Landscape areas(Pervious surfaces)— 15,194 sq. feet(0.35 acres)
Using KCRTS modeling, the 2 year flow rate is 0.153 cfs. The filter vauft is required to be sized to for 35%
of the 2 year event or 0.35*0.153 = 0.054 cfs (or 24 GPM). This information has been provided to Contech
Engineered Solutions, their proposed system is for three filters with a 3'of head drop across the structure.
The proposed system is attached to this section.
Z
W
�
�
�
a
a
� � Denis Law �
Mayor � � Cl� �f ��y G �
� �� � `� ��<
, � _ ���o
Community&Economic Development Department
C.E."Chip"V ncent,Administrator
December 22, 2015
Mr. Chris Pressey
PO Box 40173
Bellevue, WA 98015
RE: ZK Short Piat(U15002516)—StormFilter�without pre-settling-Adjustment
2015-03
Dear Mr. Pressey:
The City of Renton has completed review of the adjustment request for the ZK Short Plat
Development (LUA13-001564, U15002516) in accordance with City adopted 2009 King
County Surface Water Design Manual (KCSWDM) and associated City Amendments. Our
review of the information leads us to understand that the applicant's engineer is
requesting an adjustment for the implementation of the StormFilter System for Basic
Water Quality Treatment without pre-settling requirements.
Findings:
1. Section 6.1.1 of the 2009 King County Surface Water Design Manual requires a pre-
settling facility to be provided when the filtration faciiity is not preceded by a
detention facility. However, under se�tion 6.5.5 an adjustment without pre-settling
may be considered on an experimental basis for drainage basins less than 1/2 acre
of impervious area.
2. The Stormwater Management StormFilter� (StormFilter) is a flow-through
stormwater filtration system comprised of a vault that houses media-filled
cartridges. As stormwater fi{Is the treatment chamber, stormwater filters through
the media to the center of the cartridge, and treated stormwater is collected and
discharged through underdrain collection pipes.
3. The proposed ZPG media StormFilter systems for basic treatment is located at the
downstream point of the private access tract; and is collecting and treating runoff
from the site. The proposed impervious area is 0.27 acres.
Based on these understandings, findings, and section 1.4 of the 2009 King County
Surface Water Design Manual as amended by the City of Renton,the adjustment for the
implementation of the StormFilter System for Basic Water Quality Treatment without
pre-settling requirements is approved under the folfowing conditions:
-,-�r��.?�., ,-.��� , � �c- , ,��,�� ��;� . . � ..:,-, . ��, _ ,��,�� . , ,
� �Mr.Chris Pressey
Page 2 of 3
December 22,2015
Conditions:
1. The Homeowner's Association or Facility Owner(s) shall enter into a service
contract with an approved contractor or StormFilter� representative for the long
term maintenance of the system located on private property to be maintained
by the Homeowners Association or Facility Owners.
2. To account for the fact that there will be no pre-treatment provided upstream of
the proposed filtration system, the ZPG media StormFilter shall be oversized to
account for the total impervious area (0.27 acres) to be constructed on-site
(pavement area plus building roof area). ;
3. The ZPG media StormFilter systems are designed to treat 35 percent of the I
developed two-year peak flow rate for all the impervious areas to be constructed
(including the building).
4. The StormFilter shall be sized per the manufacturer to comply with all the
criteria listed in section 6.5.5 of the 2009 KCSWDM as amended by the City of
Renton.
5. Further analysis and design calcutations for the StormFilter� system shall be
included in the TIR for final approval.
6. Facility inspection, maintenance, and reporting are required by the City of
Renton Surface Water Utility for the Property Owner maintained StormFilter� in
perpetuity. The facility inspection, maintenance and reporting is required per
the Ecology National Pollutant Discharge Elimination System Phase II Municipal
Stormwater Permit (Section 55.C.4.c.iii}. Facility owners are responsible for
ensuring that stormwater facilities are properly maintained and functioning as
designed and permitted. The StormFilter• facility shall be inspected every six
months by the supplier during the first year of operation as offered with the
purchase of the StormFilter� systems. Inspections will be used to determine the
site-specific maintenance schedules and requirements. Maintenance procedures
should follow those given in the most recent version of the StormFilter�
Operation and Maintenance Manual. During the first year of operation of the
facility, written records of the inspections and maintenance shall be submitted
to the City of Renton Surface Water Utility Private Stormwater Inspection
Program.
7. Following the first year of operation, the faci�ity owner(s) shall annually have the
StormFilter� inspected and maintained per the procedures in the most recent
version of the StormFilter� Operation and Maintenance Manual. Written
records of the inspection and maintenance shall be submitted to the City of
Renton Surface Water Utility, to the attention of Surface Water Utility Private
Stormwater Facility Inspection Program. If more frequent inspection and
maintenance of the StormFilter� is required by the manufacturer or is needed to
' ' M�.Chris Pressey
Page 3 of 3
December 22,2015
ensure performance of the facility, then the additional inspection and
maintenance reports completed within the year shall be provided with the
annual report.
8. Written records of the inspection and maintenance shall be submitted to the City
of Renton Surface Water Utility, to the attention of Surface Water Utility Private
Stormwater Facility Inspection Program. Inspection reports will be used to
determine future site-specific maintenance schedules and requirements.
9. The applicant will need to submit a Drainage Facility Covenant all lots within the
ZK Short Plat for inspection and maintenance of the private StormFilter� ,
treatment facility that will be pri�ately maintained. The Drainage Facility
Covenant can be found in Reference 1 of the City of Renton Amendments to the
2009 King County SurFace Water Design Manual. A site plan showing the
location of the treatment facility must be included as Exhibit A with the �'
declaration of covenant.
10. A letter signed by the Homeowner's Association or property owner(s) agreeing
to the required inspection and maintenance schedule is required as a condition
of granting this adjustment. The letter is to make the property owner(s) aware
of the possible increase in the cost of maintenance, inspection, and replacement ,
of cartridges that may result from placing the filtration system without
presetting. The letter shall be submitted to the City prior to construction permit
approval.
11. The approval of this adjustment does not relieve the applicant from other city,
state, or federal requirements.
If you have any questions about this adjustment, please contad Ron Straka, Surface
Water Utility Engineering Manager, at (425) 430-7248.
Sin rely,
���
rianne Bannwa , .E. Ron Straka, P. .
� Development Engineering Manager Surface Water Utility Engineering Manager
cc: Lys Hornsby,P.E.,Utility Systems Director
Mike Stenhouse,Maintenance Services Director
Rohini Nair,Plan Reviewer
�cu:a lo�sm mci,F��^^�
Hebe Bernardo,Surface Water Utility Engineer
\\RvFPS-02\Depts\PW\File Sys\SWP-Surface Water Projects\SWP-27-Surface Water Projects(CIP)\27-3129 Renton
Stormwater Manual\ADJUSTMENTS\2015\2015-3 ZK Short PPlat-StormFilter no presettling.doc
Y
a
W
m
W
Q
�
a
a
Existi�g COnd%tion Impervious Pervious
Area Breakdown Tota/Areas (sa, feet) s , feet
Parce/ 28668
House 1924
Driveway (PGIS) 2910
Walkways/patio 920
Garage 532
Landscaping 22382
Frontage 2850
Aspah/t (PGIS) 16Z0
Compacted garve/shoulde� (PGIS) 0
Lawn/landscaping 1230
79 6 23612
0.72 O.IB 0,54
Acres Acres Acres
ZK Short P/at (2) (3) I
Area Breakdown ** Impervious '
(1) Mitigated tmpervious Surface
Deve%ped Condition [otArea Impervious Surfaces Runoff Pervious
Area Breakdown s , feet lsa, feetl (sq, fee� s . feet s , feet
<�i�-�sovo*2)> �so�io *<ZJI
cots
Lot 1 6910
House, walkways, patio 2200 500 1950 250
Driveway (PGIS) 300 300 I50 150
Access Road (PGIS) 1440 0 1440
Landscaping Q 2970
3540 3370
Lot 2 7869
House, walkways, patio 2200 1000 1700 500 ;
Driveway (PGISJ 300 300 150 150 ',
Access Road (PGIS) 1992 0 1992 '
Landscaping 0 3377 '
3842 4027
Lot 3 7869 '
House, walkways, patio 2200 1000 1700 500 ',
Driveway (PGIS) 300 300 150 150 '
Access Road (PGIS) I992 0 199Z ;
Landscaping 0 3377
3842 4027 I
Lot 4 6020 �
House, walkways, patio 2600 1000 2100 500 I
Driveway (PGIS) 300 300 150 150
Landscaping 0 3120
2250 3770
Frontage
Sidewalk 375 375 -
Apron (PGIS) 160 0 260
NE 71fi Street (PGIS) ZSZO 0 1520
Landscape strip 0 695
2155 695
15629 15889
0.36 0,36
Acres Acres
**-Lot mitigation includes "limited Infi/traion"of 1,000 square feet of roof area(c�edit 50%impervious runoff)
and "sheet flow"dispersion of driveway(20'x IS) -each lot. Mitigation of 1,300 square feet per/ot
z
�
�
�
z
�
EXISTING CONDITIONS
�? �-�`����` �'��� ���
�,. '' .�� �.�` ��.,.
Are a _�_----- ?�
Till Forest 0.00 acres
Ti(i Pasture 0.00 acres
Till Grass 0.5A acres
Outwash Forest d.�� acres
Oulwash Pasiure 0.00 acres
Outwash Grass 0.00 acres
Wetland 0.00 acres
Impervious 0.18 acres
--,-. -_ _----_ .
.._Totai -- -- --
0.72 acres.
Scaie Factor: 1.00 Houriy Reduced
Time Series: ZK Short Plat Existing Conditions »
Compute Time Series (
Modii}r User Input �
-- __..._._ _._,_- - - -- _ _ _.__ __._---._---- ---___ . ______.___. ____ __..___..
File for computed Time Series [.TSF]
- _ �: �»
�
Flow Frequency Analysis
--------------------------------------------------------
Time Series File:zk short p1aL existing conditions.tsf
Project Location:Sea-Tac
---Annual Peak Flow Rates--- -----Flow Frequency Analysis-------
Flow Rate Rank Time of Peak - - Peaks - - Rank Return Prob 1
(CFS) (CFS) Period �
0 .092 4 2i09i01 2:00 0.199 1 100.00 0.990 '
0 .063 7 1i05i02 16:00 0.113 2 25.00 0.960 C�
0.113 2 2i2?iO3 7:00 0. 096 3 10.00 0.900
0.055 6 8i26iO4 2:00 O.D92 4 5.00 0.800 �j�( �
0.069 6 10i28iO4 16:00 0.089 5 3.00 0.667 ti���
0.096 3 1i18i06 16:00 0.069 6 2.00 0.500
0.089 5 11i24i06 3:00 0.063 7 1 .30 0. 231
0. 199 1 1i09i08 6:00 0.055 8 1.10 0.091
Computed Peaks 0.170 50 .00 0.980 .
'� � � /
DEVELOPED CONDITIONS
? - .� - ��� �r �J�
.�:-,�>
-Area ------ ?�
Till Forest 0.00 ac�es
Tili Pasture 0.00 acres
Till Grass 0.36 acres
Outwash Foresi O.UO acres:
Outwash Pasture 0.00 acres
Outwash Grass 0.00 acres
Wetland 0.00 acres
lmpervious 0.36 acres �
- - -- __-
- Total---__ _
0.72 acres
Scale Factor: 1.00 Hourly Reduced
Time Series: ZK Short Plat Developed Condition » I,
Compute Time Series ! �
Modify User Input (
_._.______ __. __ __... ___.._- -.------ ------ --.___ __ . ---__ . _.______--,--
File for computed Time Series [.TSF]
�:.:,-=Y. ���
Flow Frequency Analysis
�
--------------------------------------------------------
Time Series File:zk short plat developed condition.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 l�
0.119 5 2i09i01 2:00 0.246 1 100 .00 0.990
0.093 8 1i05i02 16:00 0. 145 2 25.�0 0.960 ���
0.145 2 2i27iO3 7:00 0. 140 3 10.00 0.90D
0.097 7 8i26i�4 2:00 0 . 126 4 5.00 0. 800
0.117 5 10i28iO4 16:00 0.119 S 3.00 0 . 667 �(�
0 . 126 4 1i18i06 16:00 0.117 6 2.00 0.500 �ir�v
0 . 140 3 10i26i06 0 :00 0.097 ? 1.30 0.231
0.246 1 1i09i08 6 :00 0.093 8 1 .10 0 .091
Computed Peaks 0.212 50.00 0.980 .
� i � � /
. � I
PROPOSED WATER QUALITY TREATMENT
I�
i
� CHAPTER 6 WATER QUALITY DESIGN
Guide to Appiying Water Quality Menus
1. Check the exemption language on Section 1.2.8 to deterrnine if or which thresho[d discharge areas
of the project s�te must provide WQ treatment per Core Requirement#8.
2. Use the Basic WQ treatment azeas Section 1.2.8.1.A to determine if basic or enhanced treatment is
required.
3. Consult Section 1.2.8.1 for other design requirements,allowances,and flexible compliance
provisions related to implementing water qua(ity treatment.
4. Read the implementation requirements in Chapter 1 (Section 1.2.82)that address pollution
generating pervious surface. For some WQ menus,and in dome situations,the facility requirements
for these surfaces are eased.
�. Detercnine if your project fits the definition of a high-use site(see Special Requirement#5 in
Chapter 1). If it does,or if you elect to provide enhanced oil pollution control,choose one of the
options presented in the High-Use menu, Section 6.1.5 (p.6-15). Detailed designs for oil control
facilities are given in Section 6.6(p.6-U9).
6. General water quality facility requirements(see Section 6.2,p. 6-17)apply to all menus and may
affect the ptacement of facilities on your site.
61.1 BASIC WATER QUALITY MENU
• Replace "WhereApplied"with thefollowing(p. 6-4):
Where Applied:Basic WQ Treatrnent Areas are designated by the City of Renton where a general,cost-
effective level of treatment is sufficient for most land uses. Some land uses,however,will need an
increased level of treatment because they generate high concentrations of inetals in stormwater runoff and
acute concentrations of inetals in streams are toxic to fish. T'he treatment facility requirements for Basic
WQ Treatment Areas provide for this increase in treatment. For precise details on the application of this
and other water quality menus,refer to Section 1.2.8, "Core Requirement#8: Water Quality."
• .�Idd the folloit�ing basic xater qualiry treatment option(p. 6-S):
❑ BASIC WQ OPTION 9—RAIN GARDEN
A Rain garden,also known as"bioretention," is excavated or otherwise formed depressions in the
landscape that provide for storage,treatment,and infiltration of stormwater runoff. The soil in the
depression is enhanced to promote infiltration and plant growth.Plants adapted to wet conditions are
planted in the enhanced soil. Where bioretention/rain gardens are intended to fully meet treatment
requirements,they must be designed,using WWHM as the approved continuous runoff model,to infiltrate
91%of the influent runoff file;see section6.7.1 for details.
6.1.2 ENHANCED BASIC WATER QUALITY MENU
• Under "Where Applied,"the last sentence in the note, which refers to Sensitive Lake WQ Treatment
Areas, does not apply in the Ciry of Renton{p. 6-7).
City of Renton 2009 Surface Water Design Manual Amendment
6-2
, 6.1.1 BASIC WAT'ER QUALITY MENU
❑ BASIC WQ OPTION 5—STORNNVATER WETLAND
A stormwaler wetland uses biological processes of plant uptake and bacterial degradation as well as
physical and chemical processes and gravity settling to remove poilutants. The footprint of the
stormwater wetland is sized based on the wetpond sizing,but the depth of water in the second cell is
reduced to encourage plant growth;see Section 6.43(p.6-89)for design details.
❑ BASIC WQ OPTION 6—COMBINED DETENTION AND WETPOOL FACILITIES
This option allows the wetpond,wetvault,ar storinwater wetland to be placed under the detention facility
live storage. Where site conditions pernut its use,this oprion occupies less space than separate siting of
detention and water quality facilities. The basic wetpond portion of the combined facility is sized using
the same method as the wetpond in Option 3; see Section 6.4.4(p. 6-95) for design details.
❑ BASIC WQ OPTION 7—SAND FILTER
A sand filter is a depression or pond with the bottom made of a layer of sand. Stormwater is treated as it
percolates downward through the sand layer. Sand filters treat to a higher level of TSS removal than do
other water quality facilities. Therefore, slightly less of the annual runoff volume may be treated through '
the sand filter and still meet the Basic WQ menu goal for TSS removal.
Sand filters may be built as open ponds,underground vaults or linear perimeter trenches;see Section 6.5.2
(p.6-104)for basic and large sand filters,Section 6.53 (p.6-123)for sand filter vaults,and Section 6.5.4
C (p.6-129)for lineaz sand filters. A sand layer may also be installed above an infiltration pond or vault to
treat stormwater before it infiltrates. Presettling is required prior to sand filtration if no other WQ or
detention facility precedes the sand filter.
❑ ASIC WQ OPTION 8—STORMFILTER
The Stormwater Management StormFilter�(StormFilter)is a flow-through stormwater filtration system
comprised of a vault that houses media-filled cartridges. As stormwater fills the treatment chamber,
stormwater filters through the media to the center of the cartridge,and treated stormwater is collected and
discharged through underdrain collection pipes. Currently,ZPGTM(zeolite/perlite/granular activated
carbon)media is the only media approved for meeting the Basic water quality treatment requirements.
The StormFilter is sized using both mass-based and flow-based methods;see Section 6.5.5 (p.6-134)for
details. Note:Presettling is required.
- G t'� ��� v�rl�l.t.� �l� �j'� �-�p�1� 0(z-
W t�.�. C�R-��" WA�t��- �v�-- t'R� • ��i'tt.�N(� . �
� '(�t� ���t l�� 1 � 0 4�?.ot b, ( Ya4�r �OT C�-t-��v�
�� �Oti F-�GA�''c as �� �1���-�t N f� �R-�'C��
� ��� p,� ,
2009 Swface Water Design Manual 1/9/2009
6-5
K1NG COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL
6.5 EDIA FILTRATION FACILITY DESIGNS
This section presents the methods,criteria,and details for analysis and design of sand filters and generic
information for StormFilters. Specifically,the following specific facility designs are included in this
section:
• "Sand Filters—Basic and Large," Section 6.5.2(p.6-104)
• "Sand Filter Vaults," Section 6.53 (p.6-123)
• " ' d Filters," Section 6.5.4(p. 6-129) �I
• "StormFilter,"Section 6.5.5 (p.6-134). '�
The informarion presented for each filtrarion facility is organized into the following categories: I
1. Methods of Analysis: Contains a step-by-step procedure for designing and sizing each facility.
2. Design Criteria: Contains the details,specifications,and material requirements for each facility. i
6.5.1 GENERAL REQUIREMENTS FOR MEDIA FILTRATION I
FACILITIES
Presettling Requirement
Filtration facilities are particularly susceprible to clogging. Presettling must therefore be provided before
stormwater enters a filtration facility. The presettling treatment goai is to remove 50 percent of the total '
suspended solids(TSS). This requirement may be met by any of t6e following:
1. A water quality facility from the Basic WQ Menu(see Section 6.1.1 for facility options).
2. A presettling pond or vault,which may be integrated as the first cell of the filtration facility,with a
treatment volume equal to 0.75 times the runoff from the mean annual storm(V,=0.75). See
Section 6.4.1.1 (p.6-70)for information on computing Y,. See design requirements below. Note:For
the linear sand filter, use the sediment cell sizing given in the design instead of the above sizing.
3. A detention facility sized to meet the Leve12 flow control standard.
4. A King County approved pretreatment technology(see Section 6.2 Emerging Technologies).
Other Pretreatment Requirements
1. Sand filters not preceded by a facility that captures floatables,such as a spill control tee,must provide
pretreahnent to remove floatable trash and debris before flows reach the sand bed. This
requirement may be met by providing a catch basin with a capped riser on the inlet to the sand filter
(see Figure 6.5.2.B,p.b-121).
2. For high-use sites,sand filters must be preceded by an oil control option from the High-Use menu,
Section 6.1.5(p. 6-15).
Design Criteria for Presettling Cells
1. If water in the presettling cell or upstream WQ facility will be in direct contact with the soil,it must
be lined per the liner requirements in Section 6.2.4.
Intent:to prevent groundwater cantamination from untreated stormwater runoff in areas of
excessively drained soils.
2009 Surface Water Design Manual 1/9/2009
6-103
SECTION 6.5 MEDIA FILTRATION FACILIT'Y DESIGNS
. .
6.5.5 STORMFILTER j
The Stormwater Management StormFilter�(StormFilter)is a flow-through stormwater filtration system
comprised of a vault that houses media-filled cartridges. As stormwater fills the treatment chamber,
stormwater filters through the media to the center of the cartridge,and treated stormwater is collected and
discharged through underdrain collection pipes. Figure 6.S.S.A(p.6-137)shows a schematic
representation of a StormFilter.
Applications and Limitations
A StormFilter with ZPGT"'(zeolite/perlite/granulated activated carbon)media may be used as a single
facility(with pretreatment)to meet the Basic treahnent requirement. In addition,the StormFilter with
ZPG may be used as the first(Basic)facility in a treatment train to meet Enhanced Basic,Sensitive Lake
Protection,or Sphagnum Bog Protection. Use of the StormFilter with ZPG as the first facility in a
treatment train will require pretreatment.
A StormFilter with CSFT"'(leaf compost)media may be used as a second water quality facility in an
Enhanced Basic treatment train(per Table 6.1.2.A,p.6-8)or a Spagnum Bog Protection treatment train
(per Table 6.1.4.A,p.6-14). StormFilters are especially effective in situations where removal of inetal
contaminants is desired.
The StormFilter may be filled with several types of filter media. Until additional performance data is
collected for additional types,only t6e CSF leaf inedia is acceptabie to meet Enhanced Basic and only
the ZPG media is acceptabie to meet Basic water quality requirements. Other types of inedia may be
allowed with an Experimental Design Adjustment after the media has been approved through the state
Department of Ecology's TAPE program(see Section 1.4.2). An adjustment without presettling may be
considered on an experimental basis for drainage basins less than'h acre of impervious area. The
StormFilter with ZPG media does not meet the Lake Protection Standard as a stand-alone facility.
Consult the water quality menus in Section 6.1 (p. 6-3)for spec fc information on how a StormFilter may
be used to meet Core Requirement#8.
6.5.5.1 METHODS OF ANALYSIS
StormFilter sizing is based on the water quality design flow and a mass loading method. Since the process
and the compost are patented,CONTECH Stormwater Solutions(CSS)personnel will configure a
StormFilter based on the design flow provided and specific site characteristics. The WQ design flow
should be based on the KCRTS modeled flows,described in Chapter 3,rather than on other flow-
estimation methods. An accurate description of land use and potential sediment and pollutant loading
sources shall also be provided to CSS personnel,who will consider these factors in sizing. The specific
sizing methodologies are described below.
StormFilter with ZPG Media for Basic Water Quality Treatrnent
l. The maximum flow rate(gpm/cartridge)is based on the effective cartridge height. T'he maximum
flow rate per cartridge shall be per Table 6.S.S.A(below). The ma�cimum specific flow rate is 1
gpm/ft.
2. The water quality design flow shall be as follows,whichever is applicable:
• Precedin detention(or no detention): 35%of the developed two-yeaz peak flow rate,as
determined using the KCRTS model with 15-minute time steps calibrated to site conditions 3s
• Downstream of flow control: The fu112-yeaz release rate from the detention facility.
3s The StormFilter was approved by DOE for Basic treatment(80%TSS removal)based on DOE's water quality design flow. This
is the KCRTS flow rate equivalent to that approved in the General Use Level Designation for Basic(TSS)Treatment:
htto:!lwww.ecv.wa.qov/proqramslwa/stormwater/newtech/use designations/StormFilterGULD12307.odf.
1/9i2009 2009 Surface Water Design Manual
6-134
STORMFILTER DESIGN NOTES
STORMFIITER TREATMENTCAPACITV IS A FUNCTION OF TME CARTRIDGE SELECTION AN�THE NUMBER OF CARTRIDGES.TNE STANDARD MAbMOLE
STVLE I&SMOWN WITH THE MA%IMUM NUMBER OF CARTRIDGES(J).VOLUME 9V9TEM IS ALSO AVAILABLE WITH MA%�MUM 3 CARTRIDGEB.
048'MANHOLE STORMFILTER PEAK HY�RAULIC CAPACITV IS 1.0 CPS.IF 7HE SITE CONDITIONS E%CEEU 1.0 CFS AN UPSTREAM BVPA36 BTRUCTl1RE IS ,
,Q REqUIRED. � li
� OUTLET i
BUMP
` CARTRIDGE 9ELECTION
`` ' I ' — � CARTRIDGE HEIGMT 2T 1B' LOW DROP
F= 1._ \ RECOMMEN�EDNVDRAULICDROP(H) 3.05' 2.3' 1.B'
- F P 9PEGFIC FLOW RP.TE Me Y 90MfP 1 qp�rJfl' Y 9Vm�° �OP�' 2 BDm�° �GV�°
INLET — - j CARTRIDOE FLOW RATE pm) 24,5 H.25 75 7.6 10 5
-- � � OUTLET
I '.: /,.
0
18•I,D.MANHOLE
BTRUCTURE
TOP 9LAB ACCEBS (58')0.0.
6EE FanME AND- SITE SPECIFIC
COVER DETAIL DATA REQUIREMENTS
�
� STRUCTUREID '
' WATER qUA�IN FLOW RAiE ch '
� i``'.'\ �� PEAK FLOW RATE ck '
��--_ -�-I�-�.- RETURN PERIOD OF PEAK FLOW '
� N OF CARTRIDOEB REOUIRED '
PLAN VIEW cnRrRiooeF�owanre •
CI.YNTECN Meoin ivve CSF,PERLRE ZPO,OAC,PH6
STANDARD Ol1TLET RISER � � '
FLOWKIT:40A
PIPE�ATA: I.E MATERIAL DIAMETER
INLET�IPEpi ' • '
CONTRACTOR TO GROUT TO , , .
FINIBHED GfUDE �'�.� -���� iNLET PIPE N2
OU7LET PIPE • '
\`�-- RIM ELEVATION .
GRAOE •
RING/RISERB \--�� ANTI-FLOTATION BALLABT WIDTH HEIOMT
� �� FRAME AND COVER NOTES/SPECIALREOUIREMEN76:
�p (DIAMETER VARIES)
b -'i . �. ' j. � N.T.S. 'PER ENOINEER OF RECORD
� �� FLOATABLEB
� BAfFLE
� �
OENERALNOTES
i. CONTECH TO PROVIDE ALL MATERIAL6 UNLESS NOTED OTMERWISE.
. __. _ 2.DIMENSION6 MARKEO WITH O ARE REFERENCE DIMENSION6.ACTUAI DIMENSIDNS MAV VARY.
� 3.Foft SITE SPECIFIC DRAWINGS WfTH DETAILED VAULT DIMEN810N6 AND WEIGHTS,PLEASE CONTACT VOUR CONTECM EN�INEERED SOLUTIONS
--- �� LLC REPRESENTATIVE.vmw.ConlechE6.com
w� 4.STORMFILTER WATER QUALITY 97RUCTURE SHALL BE IN ACCORDANCE WITH ALL DE81ON DATA AND INFORMATION CONTAINED IN THI9
- - _ , —� x a DRAWINO.
a �� 6.STRUC7URE SMALL MEET AASHTO HS20 LOAD RATING,ASSUMING EARTH COVER OF 0'-6'AND GROUNOWATER ELEVATION AT,OR BELOW,THE
O � �m OUTLET PIPE INVER7 EIEVATION.ENGINEER OF RECORD TO CONFIRM ACTUAL GROUNOWA7ER ELEVATION.CASTINOS SHALL MEET MSH70
INLET PIPE �� MJ00 AN�BE CAS7 WITH THE CONTECH LOGO,
��ru 8.FILTER CARTRIDGES SMALL BE MEDIA•FILLED.PA3SIVE,SIPNON ACTUATEO,RADIAL FLOW,AND BELF CLEANIN6.RAOIAI MEDIA DEPTH 3HALL
� � 9E 7dNCHE9.FILTER MEDIA CONTACT TIME SHALL BE AT LEA3T 39 BECOND6.
7.SPEGFIC FLOW RATE IS EqUAL TO TNE FILTER TREATMENT CAPACITV(gpm)DIVIDED BV THE FILTER CONTACT BURFACE ARFA(aq 11�.
�� I �=O
� SJ � �S V� II�STALL4TIONNOIES
�+ . � � � 1. ANV SUB-BASE,BACKFILL DEP7H,AND/OR ANTI•FLOTATtON PROVISIONS ARE 61TE-6PECIFIC�ESIGN CONSIDERATION6 ANO 6HALL BE
� � SPECIFIED BY ENGINEER OF RECORD.
2.CONTRACTOR TO PROVIDE EQUIPMENT WRH SUFFICIENT LIfTINO AN�REACN CAPACITV TO LIFf ANO SET TNE STORMFILTER STRUCTURE
1 (IIFTING CIUTCHE9 PROVIDE�).
�} 3.CONTRACTOR TO IN5TALL JOINT SEALAN7 BETWEEN ALL 9TRUCTURE SECTIONS AND A68EMBLE STRUCTURE.
� PIITER CARTRIDGE 4,CON7RACTOR TO PROVIDE,INS7ALl,AND GROUT INLE7 PIPE(8).
o FLOW KIT OUTLEi SUMP S.CONTRACTOR TO PROVIDE AND INSTALL CONNECTOR TO THE OUTLET RISEN STUB.S70RMFIL7ER EqUIPPED WI7H A OUAL o1AMETER HDPE
HDPE OUTLET RI9ER OUTLET STUB ANO SAND COLLAR.IF OUTLET PIPE IS LARGER THqN 81NCHES,CONTR4CTOR TO REMOVE THE B INCH OUTLET 6TUB AT MOLDED
� SECTION A-A IN CUT LINE.COUPLING BV�FRNCO OR EOUAL AND Pf30VIDED BV CONTRACTOR.
e.L'ONTRACTOR TO 7AKE nPPROPRIA7E MEASURES TO PRD7ECT CARTRIDOEB FROM CONSlRUCTION•RELAiED ERO61ON RUNOFF,
a � C�:�NTECH• SFMH48
� ,� ,�i ENGINEERBD SOLUTIONS LLC STORMFILTER '
StormFilter' www.co��e�nes.�om
� _,,�,^s,_,,,,_� � suzsce�o-saamao.,s�maaoowo,�a�esia,,on.eoee STANDARDDETAIL
- eoo-aae-i�2s eiasasa000 s�afas78B7FA%
Z
g
�
a
N
Q
W
H
Q
ZK Short Plat— Filter Vault Sizing (developed on site)
z ..- �,-,,,�; � xJ
�-Area--_.__�.- -- � ?�
Till Forest U.00 acres
Till Pasture 0.00 acres
Till Grass 0.35 acres
Outwash Forest 0.00 acres
Outwash Pasture 0.00 acres
Outwash Grass 0.00 acres
Wetland 0.00 acres
Impervious 0.32 acres
_ __ - _
Total - �--
0.67 acres � m r n '� �
�
Scale Factor : 1.00 15-Min Reduced
Edit Flow Paths (
Time Series: ZK Short PLat- Fllter Vault Sizing »
' Compute Time Series I
Modify User lnput �
________.._ __.___-- -.---- ---_--- - .----
�. ��~ �File for computed Time Series [.TSFJ
J��
� �
i
Flow Frequency Analysis
-----------------------------------------------------
Time Series Fil�:zk short plat - filter vault sizing.tsf
Project Location:Sea-Tac
; ---Annual Peak Flow Rates--- -----Flow Frequency Analysis-------
' Flow Rate Rank Ti�e of Peak - - Peaks - - Rank Return Prob
, {CFS) (CFS) Period
0.153 6 8i27i01 18:00 0.554 1 100.00 0.990
' 0.116 8 1i05i02 15:00 0.365 2 25.00 0.960
0.365 2 12i08i02 17:15 0.240 3 10.00 0.900
0.123 7 8i23i0d 14:30 0.218 4 5.00 0.800
0.240 3 11i17iO4 5:00 0.193 5 3.00 0.667
0.193 5 10i27i05 10:45 0.153 6 2.00 0.500
0.218 4 10i25i06 22:45 . . . i
0.554 1 1i09i08 6:30 0.116 8 1 . 10 0.091
Computed Peaks 0. 491 50.00 0.980 .
� ► �
%< 1� vA-�v� �,"�b c� Z�� .
� c�r�.��-r � � •'�� -''� 0 � ��� = �. 0�� • '�
�
PROPOSED BMP'S (Best Manaaement Practicesl
C.2.3 LIMITED INFII.,TRATTON
C.2.3 LIMITED INFILTRATION
Limrted i r trcmon is the use of infiltration devices from Section C.2.2 in soils t.6at are not as permeable
as the medium sands or coarse sands/cobbles targeted for full infiltiation in Section C.2.2. These less
desirable soils include fine sands,loamy sands,sandy loams,and loams,which tend to be more variable in
permeability,more frequerrtly saturated during the wet season,and more prone to plugging over time.
Wlule full infiltration may be possible under the best of these soil conditions,in the long run,these
conditions will conspire to limit average infiltration capacity to something much less than that of full
infiltration. Therefore,using limited infiltration as specified in this section will not be credited the same
as using full infiltration as specified in Section C.2.2.
Appltcable Surfaces
Limited infiltration may be applied to any impervious surface(e.g.,roo�driveway,pazking area,or road)
subject to the minimum requirements and design specificarions in this section.
Operation and Maintenance
See Section C.2.3.5(p.G50). �
C.2.3.1 REQUIRED SOILS REPORT
In order to properly design limited infihration devices,a soils report is required to idenrify the depth to
impermeable layers(i.e.,hardpan)and to the maximum wet season groundwater level. See Section ',
C.2.2.1 (p.C-41)for more details on this report. In many cases,this report will have already been
prepared as required in Sections C.1.3.1 and C.13.2 for lots where full dispersion is not feasible or
applicable to target impervious surface per Section C.2.1.
C.2.3Z DESIGN REQUIREMENTS FOR LIlVIITED INFILTRATION
T'he minimum requirements for limited infiltration are the same as those for full infiltration,except
infiliration depressions are excluded and existing soils in the location of the infiltration device may be fine
sands,loamy sands,sandy loams,or loams as opposed to only medium sands or better. Note that gravel
and medium sand soils used for full infiltration corresporrd to Soil Types IA, 1 B, 2A and 2B in the Soil
Textwal Classification system used for onsite septic system design;fine sands are Type 3;arul loamy
sands, sandy loams cmd loams are Type 4 soils. Silt and clay loams, and cemented trll(hardpan)are not
suitable for limited infiltration systems.
C.2.3.3 USE OF GRAVEL FILLED TRENCHES FOR LIlVIITED INFII.TRATION
��
The specifications for use of gravel filled trenches for limited infiltration aze the same as those used for
full infiltration,except that ev surface requires different
trench lengths as follow (a 75 feet if the soil is a fine sand/loamy sand, b} 125 feet if the soil is a
sandy loam,or(c) 190 feet i e so is .
C.2.3.4 USE OF DRYWELLS FOR LIMITED INFILTRATION
—�• The specifications for use of drywells for limited infiltration are the same as those used for full infiltration,
except th urface requires different gravel volames as
follo •(a)230 cubic feet if the soil is a fine sand/loamy san b)380 cubic feet if the soil is a sandy
loam,or c
2009 Surface Water Design Manual—Appendix C 1/9/2009
C-49
C.?.^ PLJI.I.II��'ILTRr1TION
FIGURE C.2.2.A TYPICAL TRENCH INFILTRATION SYSTEM
,� i
J i
i
—fOOf �
i
drain
PLAN VIEW �
NT$ ��4"rigid or 6'flexible i
� perforated pipe i
----•---•-•--•-•.....-•------•-•.....-----��-- � �
-._.......-•---•-•------------•-----•-•--.....__.
�
infiltration trench �sump w/solid lid
PLAN VIEW roof drain
NTS
overfiow
4"rigid or 6°flexible splash btock �
�pertorated pipe �
�y���.
;�,;�y„•:y, � � � ������,y;��i>` `�%```
6� ;,:�,.:i>i j' �;?�..,. .,��,��i,.
� .•--v------- •-----------------------------------
6'� � 'a�G
� ��'� � washed rock �, �°� °�-r'� ti 1'min 5.0'min
12� �� � 1 1/2"-3J4" - - G o ° � Gt 1'min
o , .. ^ ^ � �
�; ;, ..
�"__-_ ,'.����"' "'._.�..."".'�""'.^."'J"J�"""'"Z-� �
I f�in oo esh � CB sump wlsolid lid
I
varies
A
filter fabric--�
,�
� compacted backfill
',
�:� ,
6,. \ /.
} - 4"rigid or 6"flexible
� o
r_` " �'a perforated pipe
24" °n o �°�
u O ' JD C
� � R� p v� ° �� � washed rock
12" � ro�0"0:7��,- _� 1 1/2°-3/4`
i c �
__I—_.,.-., � ��9 0 �
'G y-;�����y'�.n'�
ij�ij�}�//�//��j
�--2��--�-►i
SECTION A
NTS
3009 Surface Vdacer Design 1�Ianual-Appendix C 1/9/2009
C-�5
. • C.2.11 PERFORATID PIPE COIYNECTION
❑ TEXT OF INSTRUCTIONS I,
Your property contains a stormwater management flow control BMP(best management practice) cailed a �I
"perforated pipe connection,"which was installed to reduce the stormwater runoff impacts of some or all oF I
the impervious surface on your property. A perforated pipe connection is a length of drainage conveyance
, pipe with holes in the bottom, designed to"leak"runoff,conveyed by the pipe, into a gravel filled trench
where it can be soaked into the surrounding soil. The connection is intended to provide opportunity for
infiltration of any runoff that is being conveyed from an impervious surface (usually a roo� to a local
drainage system such as a ditch or roadway pipe system.
The size and composition of the perforated pipe connection as depicted by the flow control BMP site plan
and design details must be maintained and may not be changed without written approval either from the
King County Water and Land Resources Division or through a future development permit from King
County. The soil overtop of the perforated partion of the system must not be compacted or covered with
impervious materials.
FIGURE C.2.11.A PERFORATED PIPE CON�TECTION FOR A SNGLE FAIVIII.Y RESIDF.1�iCE
random fill
//�//�%j�%/�//�//�%
� �j����j��/��j/�j/�j filter fabric
�6 peri pipe
18"min �°�°eQ� a°�°�a°°�
� 9 0 0 °n �� � 1�/z"-3/a"washed rock
a o� p4oa oa �a`"�
00 o a ce o 0 0
9q°op o ° �Q D °oa o
� oop�o oQQ Ac7
7 J � � O � O o � o
I�-24" min---�1
TRENCH X-SECTION
NTS
slope —�
to road
drainage system
2' X 10'
/level trench
wlperf pipe
PLAN VIEW OF ROOF
NTS
'_'009 3urface Wazer Design Manua] Appendix C 1/9/2009
C-81
PER�, PIPE C�NNECTI�N BMP DETAIL
Section 5: Conveyance System Analysis and Design
The analysis of the new conveyance system is attached to this Section. The new conveyance system was
analyzed using the"Rational Method of Analysis" per section 3.2 King County Drainage Manual.
Q(25) = C*I*A
A = 0.62 acres—assuming full site
C—4 dwelling units/0.62 = 6.5 DU/acre use C=0.60
I = 3.4 from 25 year Isopluvials
Q(25) = 0.60*0.62*3.40 = 1.26 cfs
Using Figure 4.2.1.F —Nomograph—the conveyance pipes on the project are designed:
Using 12"n-12 @s=1.00% (minimum slope on project)
From the Nomograph —a 12"pipe @ s=1.00% has a capacity of 3.75 cfs. The 25 year developed runoff
from the entire site is 1.26 cfs. The pipe conveyance system has adequate capaciiy to handle the
development.
Section 6: Special Reports and Studies
Geotechnical Engineering Report—Robert Pride dated July 25, 2015
Geotechnical Engineering Report—PanGeo dated August 28, 2006
Flow Application Map
Groundwater Protection Area Map
Soil Survey Map
�I
� l�obert M. Pride, LLC Consulting Engineer
July 25, 2oi5
Mr. Chris Pressey
P.O. Box 40173
Bellevue, WA 98oi5
Re: Geotechnical Recommendations
Proposed Residential Project
3402 NE�� Street
Renton,Washington
Dear Mr. Pressey,
This report summarizes the results of our site investigation and geologic research on the
residential property located at 3402 NE� Street in Renton. It is understood that four
new residences will be constructed on this property that is currently occupied by and
existing house and garage.
The purpose of this report is to describe existing site and subsoil conditions,and to
provide recommendations for site development and foundation design. Geologic
mapping by Booth, et al along with prior investigations in this area were used as
references for this report.
Site Conditions
The properly is relatively flat and e�ends north from NE�� Street about 30o feet.
According to geologic mapping for this area the property is underlain by glacial till
deposits consisting primarily of silty sands and gravel. Subsurface exploration was
performed on this site to document the underlying native soils and to classify these soils
for onsite infiltration trenches.
Field logs of these test pits are summarized below and the locations of the test pit
excavations are shown on Drawing No. 1.
EB-i — Located at the SW corner of the site— Elev 392
o.o to o.5ft Topsoil— Silty Sand; dark brown, dry,loose; with organics;
0.5 to 1.5ft Sand with gravel; light brown, dry,loose to medium dense;
i.5 to 5.oft fine Sand with gravel; grey, dry, dense; no groundwater
encountered;
EB-2 — Located at the north-central area of the site — Elev 390
o.o to o.5ft Topsoil — Silty Sand; dark brown, dry,loose;
0.5 to 4.oft fine Sand with gravel; light brown, dry, loose to medium dense;
4.o to 5.5ft fine Sand with gravel; grey, slightly moist, dense; no groundwater
encountered; ',
Robert M. Pride, LLC Page 1 �,
13203 Holmes Point Drive NE Kirkland,WA 98034 '
EB-3 Located at the north end of the property— Elev 390
o.o to o.5ft Topsoil— Silty Sand; brown, dry,loose; with organics;
0.5 to i.5ft fine Sand with gravel; light brown, dry, medium dense;
i.5 to 5.oft f/m Sand with gravel; grey brown, slightly moist, dense; no
groundwater encountered;
Geotechnical Recommendations
Based on the results of our site investigation the following recommendations have been
prepared for site development and foundation design. It is understood that the building
pads will be established close to existing grades after removal of the upper topsoil layer
that will e�ose the medium dense native soils. These soils will provide satisfactory
support for the new structures using a recommended bearing value of 200o psf. A
passive earth pressure of 25o pcf may be used for lateral force restraint around the
perimeter basement foundation walls. Foundation subdrains do not need to be installed
around the perimeter building foundations since the subsoils are granular and will
accommodate any seepage collected in these subdrains.
Existing subsoils are granular and will allow for infiltration of storm water collected
from impervious surface areas. Based on King County Surface Water Design Manual —
Table 4.5.2,these subsoils have been classified as "fine sand, loamy sand" and they have
an infiltration value of 25 min/inch that can be used in the design of these trenches.
Summarv
Our findings and recommendations provided in this report were prepared in accordance
w-ith generally accepted principles of engineering geology and geotechnical engineering
as practiced in the Puget Sound area at the time this report was submitted. We make no
other warranty, either e�ress or implied. Please call me if there are any questions.
Respectfully,
�g� �� A�
0,���o�-wasy,Nc,l�
��� � y�
h
� - —
Jf
� �0 16 1 � ° �.
0
��,� '�fc�s z�.��' ��'�,
�SS�ONA1- E�G
Robert M. Pride, P. E.
Principal Geotechnical Engineer
dist: (i) Addressee
encl: Drawing No. l
17np: PresseY7thResidi
Robert M. Pride, LLC Page 2
13203 Holmes Point Drive NE Kirkland, WA 98034
f • •
�
�
I
i
14
P-3 ��
� ���
• �I
i �
� .
F � �
/ -°2 __ I = ".
�
Gp_�,
•/ _
ti� ���,,�;-
SITE PLAN
Proposed Residence Project No.
3402 NE�th Street
Renton,Washington Drawing No. 1
Robert M. Pride, LLC Consulting Geotechnical Engineer
, , ! �
���
� � c o w w • w w 7 s •
Geofechnrca7&EaRhquaku
EngJneering Consul7ants
��OF R O���
Aug„St zs,zoo6 .1AN 2 � 2Q�7
File No_06-113
�ECE�vEo
Mr.Rvbea Chen
3133—NE 19`�Piace
Renwn, Washington 98056
Snbject: Geotec6nical Engineering Report
7b2 Monroe Aveaue NE
Renton,Washington
Dear M.�.Cheq
As requested,PanGEO Inc. completed a geo[echnical engineering study for the above parcel.
Our geotechnical eagineering study was gerformed in general accordance with our praposal
dated June 13,2(}Ob,which was subsequently authoriZed hy you on July 7�20(?6. ln summary,
our service scope included reviewing readily available gealogic data,perforrning a
reconnaissance of the parcel, excavating two exploratory test pits at the site,and developing the
conclusions and recommendatioris sumzna.rized herein.
S[TE AND PROJECT DESCRiPT1Uti
Your property is located at 762 Mource Avenue Northeast in the City of Renton, Washington
(see Figure 1). As indicated on tt�e Site and Exploration Plan (Figure 2), the property is
a�proximatcly 20,000 square feet in size. Tt measures about 200 feet east-west and I00 feet
nonh-south. An existing house currently occupies the approximate west haif of yow property.
We understand that you plan to subdivide the property into two lots for coristruction of a new
single family residence on Lot 2(see Figure 2).
The new Lot 2 wiil be rectangular in shape and measures about 51 feet east-west and i 00 feet
nc�rth-south,and occupies the eastern '/. of your property. Access to Lot 2 will be through a
P�oposed 20-foot-widc driveway easement aiong the north margin of the property. We
understand that an at-grade singJe-family residential structure with a building footprint of about
I.4t10 square feet will }�e constructed on Lot 2. We also understand that the existing residence on
Lot i (west of L.at 2) will remain,and our geotechnical engineering eva7uation is limited to Lot
2
tJt•I '�'t �;"'Cnr.� -
•�1lt+c,11:j 9x l�'
i•1 f_�1h�'e�?-t�1'�, .�r�
t.i�. i?(u•1_'h..11�"r -�.�.
t
� �
• ` t�c�+�lcchr�i�al Rr�mrt
;f+_' At�,nnu=?��cauc. �icnl���ti. �l'r1
AuFLJci.'.�.��f)(?b
The}�rojrct sitc(Lut 2)is esscnti�lly}evcl,�viih less than ahnut 4 feet of topographsc relief
het��2en the tvest lot l;ne and the n�rtheasi !ot cc;rner. An appro�cimately 4-toat-high ecol�gy
hlack wall retains Gil soils►�the norih fot the back yards oF the adjacent residences alon�c�-;�
north mar,�in+�fthe suhject parcel. The iitc is ve�et.ited�s�i=h �rass�v�t�� several fr trees(22- t��
AO-inch diameter}dotti�g the s�ie.
BascJ on our re��iew Uf�tE �1l1�C!�ililly S?P.SiItVL A!t,3� Urdina;�ce, thi:property +s nct iocated
v.�thin a ma�ped sensiti>>e area.
�UBSL�RP��CE �\Pl�OEt.aT10:�S
TFs7 Prr ExcAvnr�o�
Two test �its tTP-1 and TP-�)were excavdc�d at the site on luly 2U, 2�Ob,�a expiore the
subsurfacc conditions. The test pi�5 were excavated tu depths ranging between 7%2 and 8'/z feet
with a r�sbber-tired backhoe o�vned and operated by Northwest Excav3ti.ng&Trucking Co.,Inc.,
in Mall Creek,Washinp c,n. The backhoe was equipped with a 30-inch-wide backet.
Repn;sentat�ve soil samptes were ubtained firom t6e test pils. The density and consistency of the
sub�urfare soils was estemated E�y probing the sait with a '/z-inch-dia,-neter steel T-probe and by
[t;c dilliculty oFexcavatiun. Each test pit location was subseq�enlly taped from existin�;site
fcaiures and thc aP�rnximate test pit tocations are indicated on Figure 2.
A g�olc���st from PanGFQ was present durin�ihe lield exploration program�o obsetve the Eest
QiE excavacion,coliect soil sampfes,and to describe and document the soil samples obtained from
t��c tcst pits. The suil sam�les w4re described using ►hc systern outlined on Figure A-1 in
Anrendix A. 7'h�summary test git logs are alsa include�+ ir� the Appe�dix A, following Fi�,-i:re
;1-1. r�nc�ih�subsurface conditions in ihe tes', �its wE,re d�c;�mented, the test }�;ts were
h:icE:iillccl ;mrmE.cii,�'?!�; '�vitli ihr �kcavt+�ed Snri�
l.��n�>i+�i„�tti"t F.,rt;,�:
1 w»rr�,rescn4�iivc s��il ;,,;nplc� (3 !;�ct �;�'TF'-I an�J :�+ -i'/z fect c:� TP-2)wcre sclected for sieve
������:•�;�� ��.1���•nnin�ti��ir gra�ri Size�h3racteristics. Thc tesis werc cutnp{eted by Attalyticai
►''",`•ur,:�,., 1u+_ i�i Sca��te in gt�eraf accutdance with thc ASTM D 422, Siandtird Test Method
(<u i^.,r�i�l�•-�i;.. A��:,t�rs,�s crl 5uils. Thc tesl result�arc presented in .A��cndix H.
�[!13ti!i1tP��C'L:CUi�'UI`I'ION�
i:.�:�.� "{•�.��xiT li..-`.1� ��, ��I �I,�� I'r��lirninarv t;cul<>�;ic M:1�ilf SC.311IC :lll(I V1CIAlIy. WaSF1I71b1U�7
t'��,��1�,.� �i ,I . I'�t�?>:,n�l tl�„ (�rnl<���ic Ma;� ul�lhc ttrt�ton Qua�ir��,ic. King C[�untv,
.., . .•I��u i!�1 :i':�., -r��. I';i,'�1 �r}eti �.r��}1!'1-lY t'. 'tt'(ICII.I;^ �}` �)tt:lLC171;iry V3Sf1Qit �J�3Cla� T3��.
� .,,.�. t 1'df:�iE'1.�. �11�.
, , � �
�iz��tccllnir:ll RC�x�n
?C�_' �icinr�k Avenuc, R�nt��n, 4�':�
�li��:ust 23.20flb
in �encrsl.gtaria! till is a pc�orly cirained, hetero�eneoas mixture of sili,sand and gravcl. The
1'asllon�lacial til!has been ovemdder�by gtaciai ice and is very dense.
ln summary, the sals observed in the test pits confirm the presertce of Vashon glaciaf titt
iu��icrlyinfi approximateEy 3 feet of colh�vium/distur�ed soit. T'he following is a description of
�he soiis e��couniered in the :est Pits:
L�1�'!T I: Colluvium/Disturbed Soil—Approximately 3 feet of colluvium or disturbed sails
were e�covntered in the test pits. This unii g�nerally consists of loose ta medium dense,
bro�vn and red-brown,slightly gravelly to�ravelly,silty sand. Abundant roots and iron-
oxide-staining was ohserved+;�itti�rs I!�is unii. in our opinion this un;t is nut suitable fo�
supporting structura! elemer�ts.
UNIT 1: t'as/rorr Glacial Til!—Uec�se io very ciense,gray, slightiy silty to silty, gravelly
sand was encountered in both of�hc test pits. duectly below Unit 1. We interpret this u.nit
as We VaslTon Glacial Till as shown on the reviewed geoiogic ma�s. The tiii observed in
the tes[ pits is massive with a very compact, friable fe�ture below a depth of 5 feet. Severa]
3-to 5-inch diameter roots were obseeved t�a deptla of 5 feet below gi-ound s�rface_This
unit is anlicipated to exhibit relatively low compressibility charactenstics,and is
con�idered adequate For supoortin�cc�nventional footings if free of roots and organics.
Based on the{;rain size analysis, this unit is reIativety free of fines(i.e. less than !S percent
fincs).
Ciruundwater lva�nc�t Uncountered in the tcst pits to the maxsmum d�th excavzted at a�out $l
f��t. 6videnLe c�f perched groundwat�r was obsen-ed in botl�tesk pits in the form of red-brown
iri�n-oxide stain�ng betwern depths of l'/and 3 feet. It shovid be noted that groundwater
elev.�tions arc likrly lo vary dependin�on the season, local subsurface conditions, and other
1a�turs. Gmimdwacer lev�fs are normally highesi during the winter and eacly spring.
t�E07'�;CHNICAL REC0�1MEtiUATIONS
1 n�:r�,ri<,�-►�is�n Kn�i N.��r Oh-SirF�5oiL5
W�� undi�r.,t�»+I th:�t y�tur�csisn�r is c��nsid�ring thc option af on-site cfisposa] of surface water
' �'Y �<<<���r:s��+��� '1'f�c��r.i pi��;excavated at the site �ncouniered dense to very dense,weakly
<<=,n�;:t��! �l:u�ial i i!I :u a s:h.�ll�>w�Ie�Q�c�l abaut 3 1'cc:t. Allhough the �iacia! titl is quite sandy
.,r;�f �.��tis:iu�. l�.:; tl,;n� ;�t��,ui I� p�rc�:N fines, wc co�isicie�r t}�e infil[ratian iate of lhe glacia.l till to
h�; ��c••!i�'h� h• . . .
.. t ' 1. ..�'.����»� �i:�1�_n.tirty :�nci sui! lex�ur�. "I�herct2>fr, ;t is aur apinion th;�t on-site
�it•.�;.��.,i1 t.1 ,�,fi:t�.i�E'i�� t�liill�:lii�tll !ti n!+t �ra��ica!a� tliis sitc. (�ther alternatives such tts deien[i�n
�,-,�,{�! I�t t�n�::i�.��.�c_,� � I
�t� Ii
3�>�: �i
ya.»: i
�_.-�� I
' � � � YautiEO, l�nt. -�' ' ,
-_"--_�..�-�.� I
�
� �
• � veotechnicsl }Ze�+on
7�Z;�4onrne A��enue, Renton, 1�`A
Atrgust 2�.�0{16
SElS37i(:DES]Gl�PARAIISET'ERS
�Ve anticipate'd�at the seismir desi�oi the proposed structure may be accomplished�sing the
2003 fnternaiional Building Code(1BC),which specifies a design earthquake having a 2%
pr��bability Qf occurrence in 50 years(return interval Qf 2,475 years). The following parameter�,
���hieh are cons�ti«��� ��ith t}�e ZU�)� U5G5 seisrn�c ha�d rraps, are recomme��ded for the
seismic dcsign'
Table l. 2003 1BC Seismic Design Parameters
�
Spcctrai 5pectral �s�� Control � Dgsign
Site Speccral i PGA
S�ti` A�ceieration Acceleration ��,efficicnts Response PeRO�
Class i at G.:sec.(g) ar 1.0 sec.(gl Parameter< I fsec.) � �S�/2.5)
I +
I �� g� r---�—�-
�a F� SOS SD] � TO TS
C 1.4 t ` 0.�� l_0 1.3! � D.9 0.42 ; fl.09 ( 0.45 ; U38
HQUSF:T�(3UItiDATlOr AI�D DESIGV PARAME'T�'RS
Sased �n the subsurface conditicns encountered in the test pits,i�is our opinion ch:�t
conventional spread footings are suitahte for the proposed single family residence. Footing
desi=m parameters are ouelined bei��u:
Allc,wable Bearing Pressure-We recommend that aIl tootings be founded below Soil Unit
l,and on r�ative,dense to very dcnse glacial till soils(Unit 2). The depth to che competent
soil unit 2 �vas approximately 3 feet below the existing gtound surface in our test pits. As a
�esuft,depc;nding on the design elevation, some overexcavation noay be required_ Z'he
�vCrcxcava�ion may be backiilled w�ith properly compacted struci�ual fil, iean-mix con.rete
or t'ontn�l L?ensity Fill (CE�F). Faating�construcled as discussed above may be sized u.ting
a maximum allowabie bearin�pressure of 3,000 psf. For alfowabie stress design,the
rec�mr�sendcd allowable bearing pressure may be incre;ise� by 1!3 for transient loading
::fir�diti�n,:,uch as wind ancl earthquake. All faotings should be tounded at least ]8 inches
t�einw thc Finishocl b�adr and at least t F3 inches wi�ie.
/:I1 fuutin�,�xcavations stiould be trimmec� ncat and fo�ting subgradcs shou]d be cuctuily
j�«f����:ti. riny luusc or sc��ened s�il should be removed from the footing excavation,
�;,�lu�]ii��;n�unir�ally ,�„r���;�ctcd tesi pit ba�ki�ill,if one aT thc two piis shauld be loc:aied
I�� �'�'""'' '' ��"'�k�'•C� ��'c��ln;;. J'ootin�excavatiuns sh�uld be observed by PanGEO 2�ronf�m�
� '���< <}���c::{,��::e�J ii�t�t��i�;r;u�,�r�de is consistenl with the expecte�i condiiions and ndequatr to
•.�l��t���ri ti,� �>,�,�,�,;;�.,; },�il,i�n�. '1'he depth ofuverexcavbtiun, ii'nezdcd,is alsu expcc�ed tv
�. , r., , ,.. ,� P:v�GL-O, Inc.
I -
� � I
• . ;;t;.rt,;ch��icai R�pori !
'r.2 M�nme Avenuc. K�nton, WA
.�u�aust 2$.3.006
vary, but shc�uld not exce�;d 3 feet. We recommend that footing over-sxcavations,if needed, III
be backfiiled with siructural fill. I
Tota1 anc3 differential serilements are an�cipated[v be wit�in tolerable limits for fpotings �
�iesigned and constructed as discussed above. Under statie loads,we antzcipate the footings
tc�settle less ihan about '/�inch and differential settlement shonld be less than aboui%inch.
Lateral Resistance- Lateral forces from wind or seismic loading may be resisted by the �
comhinarion of passive earth pressures acting against the ernbedded portions of the
foundations and by friction act�ng on che base of the foundations. Passive resistance values
may be dete:nuned using an��uivalent fluid weight of 304 pounds per cubic foot{pcf�.
This value includes a safety factor of about i.�assuming that properly compacied granular
f�ll will be piaced adjace�t to and suirounding the Fo�tiugs. A frictional eoe#ficient of 0.45
mav be used to uetermine th� frictional resiscance at the base of the foatings. This
cflefftcient ineludes a facior safety of approximate 1.5.
�ooting Drain -We recommenci chat footing drai.ns be incorpuraced into the design and
construction of ihe project. The foo*sng drain should consist of a 4-inch diameter perforated
drainpipe behin�and at the base c�f the perimeter waii faotings, embedded in at leasi 12
inches of clean, free-draining sand and gravel. The drainpipe shouid}�e graded to a suitable
outlet to direct water away fsom the buildings.
CU�CRETE SLA801 GR.4DE FLUORS
lt is our opinion tbat the con+,�rete slab on-grade floors are agprc�priace for cl�e site. We �',
' recnmmend that all distwbed so�ls,including Unit t soi! and roets in the Unit 2 soiIs,t�e
�
removed from wit}un the footprint of the structure,and replac�d with structural Fll. In addition, �,
tive a15o re�ammend that interior concrete slab oa grade fioo:s be under[ain by a capillary break
c<rnsistine oC at least of 4 inches of'/<-inch,clean crushed roLk(less than 3 percent fines),pea
�ravel, ar other approved materiais,compacted to a tirm an� unyielding condition. The capiilary '
urc�k :�hould hc piaced��n subgrade that tias been compacted to a dense and unyielding '
r�,nQi�:�n. A IU-mil polyechylene vapor barrier should also be placed directly below the slab.
V�c:slsc> recummene� that construction joints be incorporated into the floor stab to conhvl
crucking.
ti:l+.i't l t�{;�11.i'!Li Al�U�(JMPAC�I'1Qt�
��-'_�'-��1r,�1 is1� �;, c��tined as con�p;�cted filt placed ur�dcr buildings,roadways,siabs,pavemzats,or
�,r��°-r ��js�:-h,-ar,,;�-:uc;�.._ ��;::,.d nn vur understanding of the projec� we do not anticipate the
�:-�+:si t,,r i,r�.: ��:,:,�,;i,,�,, ���,,,,�t���� rili. However, where needed,structura! fill should be
,:.,-=-,��r� �<,,,�i,u:,,�4-_i i�, :>,iE',ii, :,t�out 3 �x:rcent�i'optimum moisture content,plac+ed jn loosz,
., , 6.,r„ ,,_ � Y�..ni;EO,inc.
�
. , � �
t�e��serhniCal Re}�nri
`t,? i�1���irc� Avrnuc, Rentun. W11
A��ust 28. 2t�Ot�
h�zri�or�tal lit2s less�}�an � inches in thickness, and systematically compacted io a dense and
r�^I�tivcly iinyieid:r��cilndition and tn at ieast 95 percent of the rr�aatimum dry density.as
�letcrnuned usi�g tcst method A�TM I� 1557. �
(f�our c�pini��n,the c�n-sil�S��il�m1y be reused as a 5ource�f struCtura! fil3 duiing ihe diy 8e2gOp.
?t�use of�hc existin�soils is ptar4ned,the exca�ated soil shc�u]d be stockpiled and psotected with
�lastic sheetin�tc��cevent softening from rainfall. If the or�-site sflils cannot be adequacely
cz�m�acted,imporicd sWcturai fills,such as City uf Seattle Type t?materials or Gravel Borrow
t�t�SDOT 4-113.I�i I).shouid be used. RecycEe�conerete cnay alst�be us,ed as structural fill in
��eu of natura� aggn:gaies.
`1��ET l``E�ITHER EARTH�VO R}�
�'onions of the suri�ciai site s�iis contain a si�ni�cant percentage of fines,and are coasidered to
� m��isiure seizsitive. Any subg:ade soi3s that become softened either by disiurbance or rainfall
ch�u;d be rema�•e�i and replac:ed w-ith progeri}�comFacied granular structural fill_ General
rc«}�nmendations reiative to earthwork performed ii� wet cansi�tions are presented below:
• Si1e ltrip�ink,elca��aticsn and subgradc�preparation should be followed pramptty by
thc plaeement and compaetion c�i clean stnictural fil],ca�illary break material or�ase
courst maieriaf.
* Footing st3bcrades must ��procecied from saftening fFam�ainFall.
• Thc sire and h��c af construction equipment�►se�may have to be timited to prevent
soil dislurbance_
+ I�urin�;wet x•eather,tt��allu+vab)e fines cantent (material by weight passing the#�00
�i�vri nf tt�e stn,�tur.,l frll shoulei be redueeci to n�,more than 5 percenl.based on the
-��r�it�n pass��►b'•'.,-inch sieve_ The fines should be non-�lastic.
• "1 �,� �n��1nJ surfacc ��ithin the constructit�n area should be graded to promote run-off
��{ �tulacc;�vaiLr 3n�1 :o prevea�t !1-�e pondin�;ol�water.
` �;�1�� �+f�,tr:�:ti ancVor�cote�tilc si(t fences shvuld be strategicatly located tu control
_n,�:i�3n ;�n�l 1hr tnt,��erncnt uf'sc�ii
'�: �<t ��. 1• 1)lt-�1`,.�i.i..l�.l�k:kC)�+1�3!�C:()N�I�E:HA710!ti5
'-�.i-. !4���,lti �.�n b� ,;>ntru)I�cf�urtn��unstructwn by clrcftxl graciing pr3ctires. TYpiculiy,this
��} i�•- �Ir �_„u,nu,_��i,�. „I <.i�:Ell<n�. ut��ra�3r �crtrnrttr di�ihes or fo�4 earthen}sernis tu caliecr
, "��= t,'� ',.:�:t �'.�1 � li����ic•?�1r�1if�� tflCtt�a��atiun. AIIt-o1le�tedH�:liEi��lOUlf� � t�tlYi(Ct�
r
," , ' ' , ! ;�, ,zi;:uirui di,cltar�r systrn3 su:h as a stomz se«er.
. 1, Panlit{C�. 1���
��
, a � r= . --:. _ —., ., i�, �:,.
�� . . «y.,�__ - -� Y�
i I -.—.—.- ' . �
i � ._.'�' , .�
� , f A! � _ �l _�.,
. � .� � l ' ` �' ig,----� �
. ,�,� k��' . � � + .mo
' ' .�i �'��I ..r. 6� ...nr (`'re.
�p
� • �orn �
:y
� '�� .e�V R'�
_ � � ��r • _..__'-_,C
� -- :� oc'..,._ ^ �.a� �a f=�TP ' _ R I
-1 �
ti -- M1�v. _ __ __
_ , • � . -- .,,�, � 'or•�o
�'� ' - �.4�... . roo
�;- � �
� Lot#2
' �Y (?mj^ct:ile; Leaend:
, �Approz.Test Pit Location
� E ' I [�Approx.umits ot Proposed swcture
I � � � , � '`
�,,.,,w�„ � ��,,, f •,Approx.Limits of Subjed Property
1 ' �y ! {Lot#2)
b
}ry-�_ Nar.Bese meP ed+ytr.d 5om Chen SAve P1u survey.
. �- .,_ _ dee�d May 5.2005.Pmvidcd by Mr.Kavm lalafya
�--- - -- - - . . . _._ . . _. _.. __ ._ __ _ onlumiA2006.
I�� Geotechnicst Engine�ring { SITE AND IXPLORA7'ION PLAH
RepoR �
�■ � • � � o . .* .0 7fi2 Monroe Aventea NE
Renton,Washingto� ��r,°;,,^, ��as�e No
Ofrt 79 2
� �'•�Y'�A��t.;�' P p �� � : x: .
�S '`i!���.y.`��`�',,_��y;.,�,�(� �; � ,�' .. � .
g� � 8 y�
fbiin..a,ue'u—__.- _
il
! �
' ' L.OG OF�TES"f PI'1'S
762 I�ZONRt}E AVENiIE NE
R�;NTO;Y,WASHINGTON
l'P-1
A�rci�irnate Elevation =4fi4 f�. �
�
" Depih Range(ft) Uescription of Subsuri'ace Conditions
- -- �
t? - I.5 Luose, bro�vn aiid dark brown, silty,�ravelty SAND;dry ta �
Imoist; grass at surface,abundant organic fragmenls{roois); `
� (ColluviumlDisturbed Soil)51�1.
�.�___ - ---
� I.5-3_0 � Medium dense; red-bro��•n, slightly�ravelly,silty SAND;
I mnist: scattered roots; (Colluvium/Disturhed Soil) SM.
�
�---- -
! 3.0 S.0 ( Dense, gray, silty,gr�velty SAND; maist; scattered 3- to 5-
` inch-diameter roots to 5 fcet; {Vashon Glacial Till) SIVI_ �
L _- _ ---
' S.11 7.S Y'ery dcnse, gray, silty,gravelty SAND; moist; massive; �
, (Vashon Glacial Tiil)SM, I
-- - -' ---- --
'tinte5: I}N�groundwatcr secpage encountered�n TP•l.
'')"('css pie TP-1 wa.�Icrminatcd at 7.5{eet�:low groun�!surface.
,� _ � - � _ E��s:-��:,
p�,y �� p "_ �' .ql cL :4��i �`� �4�f fiT�' '
� � � -' '� '�y' _ �n�. ;.�. -
iz� - . ,�,�`� �� - ,�,, . €`.
_ � . ... . - . .S�� _ "s�.. _ . .- �% _
�«
� » � - ^ _ 7 _
, ���x. �. .. • wt.
� �•� : - . - - �3�4'�+-24d .�P"r
� ,. 4,:�� ' ' - �; ��..�g�,� _
��I, I `
. . � �R � �� Fw �� -
I - A � �- ��'����� �`a�{.�"-Ys��j'
. ` '. 4� t r' , . _
� F, i!� '�,'..� <2 � •
"r �"E'� '. ' . . ��'.e* F. ' � �=e�"':'f
�.L� �_ti.� :
��` ".. . '..�i .��'- jMV f. � , ;'�Y..�=.�.
z� ` �Y
- - � . � �� �d y�����'.� � ����� •3
� „•'h` �it . '� y ...�. . K�J',.: •�e., ��q
-;' '1't CQS � �.._� 1�
�r'
f ' �� A� `� � �-- �� L� _ '
. 1.�,�yx _ _ f � . . .
. ... . .� 3�F � .'�� ��.yY VY. �+�� ��.f ° . .
`9 �
� . . � � -.k y j .� {��a x p .
. . . . _ _ h•�. #dk•.'� � -y4� .�e�.�.a�' 4""��,� .
ro._�i . i ` .+Y.b C_ �.3'� t F 4"^�z+'� 3� _' ..
�� � ��ee
. ��bt �, -# 3s� �6 y.3 �" !y� �.. qi � , .
;"s r
t �
fq � �# ��n#�i.«> .- ac`� � 3` ���� , � .
.. k;F , � ,. ..�c„�tF�:_� � ����'� a� : .
� . „ * � T � 5 y * L �� � ' . .
� w� f iwc��`..�ffi�'�Y 4 �+ � k*.. .�
!
� '�" - �y 7� -' �'�
. � . - '��. � _ �' � _�c �'�¢ �_�"�* .�.
I� _ � � �
_ �� -,�, � „�.
� � � �� �,� ::n�. �
_ r�s_�
� ,r
I
� ��
.�,y,.z
-- . ��;�-.
- Figurc:'�-� (Page ! of�) =
— � �,
• � L,4G OI�TEST PITC
76Z h�oNrtor Av�:;wF NE
REN?{?N,WASHThC7'QN
TP-2
�� r��ximatc [:ir��ation -467 ft.
-- ----r ---
I �� Dcpth Ran�e f ft) Description Qf Subsurface CondiHons
�---- _-----
�
ii1.0- }.S Loase, brown and dark brown, silty,gravetly SAND; dry to
moist; grass at surface, abundant organic fragments (roots);
; �Colluvium/Disturbed Soil) SM.
� E.5 - 3.Q Mcdium dense,red-br�wn, slightty gravel]y,silty SAND;dry
� ti� tnois3; scattered roots; (Catluvium/Disturbed Soil) SM.
j________�.— --- - . ---
� 3.t)-G.0 Dense, ��ray, silty, graveliy SAND; moist; roots to 4.5 feet;
(Vashan Glacial Till) SM.
; r,.t� - H.5 ��ery densc,gray, silty, �ravelly SAND; maisi;massive;
�` — � ` (Vashon Giacia! Tilt) SM.
,
'tiutcs: l)No�oundwatcr seepag�cncountered in TP-2.
2)Te�t pit TP-=w;�s�rrminated at 8.�fee� bclow�gmund surface.
t,. ; . —' �� �- a
Ra � .��3 s� S.�s"
' ���'�-fi-��� 3 � .- �� ."f �; � k`'s`" �I
-' _�s�� .. � � a�w�+.�::,- � /'
_. ^„ � � ,�t"1n-,;� . .
'F _ . .:�{T �
�' _ ��' _' _ . w . '�.-� � H..���,_'-ti ,
. -_ -. :F4 Y . . _ ' . ...,S�:o!C. -. . .
. '" . - . " :.vL..: - . .
_ . -� � � � :irl i .'}�' ��rr .
.�
�., _ I
.. �. M f�-�.
. � -•�F�� . . �. �
� _ .. '- _ �. . . �
5�
- � �:,. _ �,S� ._ .
_ .d'.ta' ' -
,� - � , .. �.... . .. ..:. _,..` _� . .
.,, . �, � - _ � - , .
�e . � ��..f .
� � = a*'�s . .z rt
�._ ._
.. 5� .:� . �' v'_ .. . .
_> ' _ c- "-� .s�.:. ",�Y ,. .. . '
:' . . � �� .,- ���3 �r.. .. .
. � �qr���'�� ���,, �
� �� � _ _ -
� - �a _ �'� -r-,
�
' �� . '�"rAF�'1'4 '�t, • _ .- f _ _ � �...
') ' �
't'-=s+e..'Y�j4�"��i" r � . � x.("�-''"'�i � ';s� �fs_
'� �' �P'T"' ,��:' � & �- YF '; ✓ � __ �"''",.
_ . a�a3. �4'�s � �� .�:�'". .�- f .�s, -.. ,r� _
��z-a �-.� �
. 1'�s s � �Y ��..�� � � ., �-e- �
` ��'''t..` � ._._- �' e "d'e�� : .. ,�y ��' .
�`�t-s _- �`�f L . _,,.: "-�' . �s
' _ °� s ' � t{i`-pj •-a�,,. -��taE�� ,V` r '
� ' ' `�� �i t#. � �s.r'X`���}��.
� � . � ���iy��. �����.y��� � t� ..
' '_ _ . _ . _ ... _. .�_ - '<.. �' - cs^ii�£s." '.� '},�`.' ,
�,2:
��
%`� �„�.;;f,a.:
�� � ;�'
�-' ',
��'
• Figure A-2 (Page�uf 2) - �"`-�': '
.a. "F".'r�w-.µy �
SHORT PLAT CONDTIONS OF APPROVAL
' D�PARTMENT OF COMMUNITY _ c�ry oc,� ,.;
��, � ,f f � � � '�;,. I
AND ECONOMIC DEVELOPMENT ,. [�`;,�'���I C_,C` :C."l =�;,�'
ADMINISTRATiVE SHORT PLAT REPORT & DECISION _ _ `
A. SUMMARY AND PURPOSE OF REQUEST
------ _ _— - ___ ___ _ - -- -- - — -
REPORT DATE: April 3, 2014
Project Name: ZK Short Piat ,
Projeci Number: LUA13-001564; SHPL-A
Project Monager: E�izabeth Higgins, Se�ior Planner
Owner/Applicant/Contacr: Chris and 8everly Pressey; P.O. Box 40173; Belle�ue WA 98015
Projecf Location: 3402 NE 7`"St; Renton WA 98056 `
Projeci Summory: The applicant has proposed subdividing a 0.66 acre property, focated in
the Highlands neighborhood of Renton, into 4 lots suitabie for single- I
family residential development. The proposed action, a short p�at, is an �
administrative process. The property is designated Residential Single-
Family in the City of Renton Comprehensive Land Use Plan and zoned
Residential 8(R-8). The proposed development density is 8.12 dwelling
units per net acre.
Sire Area: 28,635 sf(0.66 acre) Toral Building Area GSF: N/A
� �- :��C��'»� �� �'-�� `_',���! e.o� {�a��
�ue �,u
� . �2 .'Sf �'� �.`Su,4� � w� In � � �Y����
f"� .�„� ►�'. _
� �--� �. +��'�
' _ �� - , �� ��51" _
� . •^ I '`.,, .��! � .:` '' . . . �. 1 � • . ..-.. ... �ai i..". _.�
��r ggg
{ �¢ �
� �T�� � � �t�
— �'+c ��Y�� � �'.#�
. - _ •'Y����. .� :?� �
� ��' �i �~r�
� k� }�
_��� �' ��`�..t w4 I
;ff' >
�r.� . ��.� � �� 4Y� :�� -
��� ��'..::E�}v�y� tur- . ��..
•t�. �4r`}��r �� �l� s""fM'y�J�;�/' � -'i(�"�i ISa:
�'���'�., �'�- _
� 'e� ■-
!� � � I
� �"}� — .�� � _ I
�.- '�' ' ` ��.. �. .� 5
. �
Project Locotion Map
Gty of Renton Department of Community&Economic Development Adminisirative Short Plat Report&Decision
ZK SHORT PLAT LUA23-001564;SHPL-A
� Report of April 3,2014 Page 2 of 17
B. EXH18I T5:
Exhibit 1: Administrative Short Plat Report and Decision
Exhibit 2: Vicinity Map
Exhibit 3: Zoning Map
Exhibit 4: Plat Plan/Topographic Plan
Exhibit 5: Tree & Landscape Plan
Exhibit 6: Prelirr�inary Drainage Report
Exhibit 7: Storm Drainage Plan
Exhibit 8: Sewer&Water Plan
Exhibit 9: PropertyServices �or�ments
Exhibit 10: Assigned Addresses
Exhibit 11: Comment Letter`rom Jeff and Stephanie Schaewe
C. GENERAL 1NFORMATJON:
1. Owner{s) of Record: Chris and Beveriy Pressey; P.O. Box 40173;
Bellevue WA 98015
2. Zoning Designation: Residential 8 (R-8)
3. Comprehensive Plan Land Use Designation: Residential Single Family (P,SF;
4. Existing Site Use: Residentiai
5. Neighborhood Characteristics: Residential
a. North: Single family residentia!use rn R-8 zore
b. East: Single famiJy residentia/use in R-8 zone
c. South: Single family residenrial use in R-8 zone and NE 7tn St
d. West: . Single fam!!y resrdentia/use in R-8 zone
6. Access: N E 7th Street
7. Site Area: 28,635 sf(0.66 acre}
D. HlSTORICAL/BACKGROUIVD:
Action Land Use Fiie No_ Ordinance No. Date
Comprehensive Plan N/A 5100 11/01/04
Z o n i n g N/A 5100 11/Ol/�4 I
An nexation N/A 1475 03/25/54
E. PUBLIC SERVICFS:
1. Utilities
a. Water: Water service would be provided by the City of Renton.
Sh,ort P(at Report 13-OQ1564.doc5b?
• City of Renton Department of Communrty&Economic Development Administrative Short P�at Report&Decision
ZK SNORT PLAT LUA13-001564;Sf-tPL-A
Report of April 3,2014 Page 3 af 17
b. Sewer: Sewer service would be provided by the City of Renton.
c. Surface/Storm Water:There are no existing storm water control facilities at the site.
2. Streets: NE 7�h Street paved, residential street with a right-of-way width of 60 feet.There are
no curbs, gutters,or sidewalks at or near the project site.
3. Fire Protettion: City of Renton Fire Department provides service.
F. APPLICABLE SECTIONS OF THE RENTON MUN/C1PAt CODE:
1. Chapter Z Land Use Districts
a. Section 4-2-020: Rurpose and Intent of Zoning Districts
b. Section 4-Z-070:Zoning Use Table
c. Section 4-2-110: Residential Development Standards
d. Section 4-2-115: Residential Design Standards and Open Space
2. Chapter 4 Property Development Standards
a. Section 4-4-030: Development Guidelines and Regulations
b. Section 4-4-060: Grading, Excavation and Mining Regulations
3. Chapter 6 Streets and Utility Standards
a. Section 4-E-030: Drainage (Surface Water}Standards
b. Section 4-6-060:Street Standards
4. Chapter 7 Subdivision Regulations
a. Section 4-7-070: Detailed Procedures for Short Subdivisions
b. Section 4-7-120:Compatibi{ity with Existing Land 'Use and Plan —General Requirements
and Minimum Standards
c. Section 4-7-150: Streets—General Requirements and Minimum Standards
d. Section 4-7-170: Residential �ots—General Requirements and Minimum Standartis
5. Chapter 11 Definitions
G. APPL/CABLE SECTIOIIlS OF THE COMPREHE/1tSlVE PLAN:
l. Land Use E{ement: Residential Single-Family (RSF) land use designation
2. Community Qesign Element: Estab!ished Residential Neighborhoods
H. DEPARTMFNT ANAtYSIS:
1. Project Description/Back�round
The proposed project is an infill subdivision of an Q.6E acre !ot in the Highiands neighborhood
of Renton (Exhibit 2). The proposed project would, if approved, result in four new (ots accessed
indirectly from NE 7th Street, a public street. A one-story, single-family residence, built in
1950, and a detached garage would be removed prior to construction of up to 4 detached,
single-famify houses.
The area is designated Residential Singie-ramily (RSF) 9n the City of Renton Comprehensive
Land Use Plan. The objectives and policies of the RSF designation are impfemented by the
ShortPlatReport 13-001564.docSb4 I
, City�f Renton Department of Communrty&Economic Development Administrative Short Plat Report&Oecision
ZKSNORT PLAT LUA13-001564;SNPL-A
ReporT of April 3,2014 Page 4 0'17
Residential 8 zoning(Exhibit 3). The proposed density for the development would be 8.12
dwelling units per net acre (du/a}.
The site has very gradual slopes of between 4 and 7 percent (downward to the eastj.There is
residential landscaping cn the site and 30 trees deemed to be "signiricant."
The Soi! Conser�ation Service map for the area indicates under€ying soils`or this site:o be
Alderwood series, which are not considered appropriate for infiltraticn drainage systems.
2. Environmental Review
Except when located on lands covered by water or sensitive areas, short p�ats are exempt from
SEPA Environmental Review pursuant to WAC 197-11-800(6j(a).
3. ComRliance with ERC Conditions
N/A
4. Staff Review Comments
Representatives from �arious city departments have reviewed the application materials to
identify and address issues raised by the proposed development. These comments are
contained in the official file, and the essence of the comments has been incorporated into the
appropria=e sections of this report and the "�,dvisory Notes to the Appl�cart" at the end of this
report.
5. Comment from the Public
Comments were received fram Jeff and Stephanie Schaewe ;Exhibit 11).
6. Consistencv with Short Plat Criteria
Approval of a plat is based upon several factors.The following short plat criteria have been
established to assist decision-makers in the review of the plat:
SHORT PLAT REVIEW CRITERIA: Approval of a plat is based upon several factors. The following
short plat criteria have been established to assist decision-makers in the rev'tew of the p1at.
(✓ Compliant; Note 1: Partially compliant; Note 2: Not compliant; Note 3: Compliance not yet
demonstrated)
1. CONFORMANCE WITH THE COMPREHER151VE PLAN: The site has the Comprehensive Land
Use designation of Residential Single Family(RSF). Land designated RSF is intended to be used for
high quality detached, single-family residential development organized into neighborhoods at
urban densities. It is intended that larger subdivisions, infil! development, and rehabilitation of
existing housing be carefully designed to enhance and improve the quality of single family living
environments. The proposal is consistent with the following Comprehensive Plan Land Use and
Community Design Element policies, if all conditions of approvaf are met, unless noted otherwise:
Short P1at Report 13-001564.doc564
• Crfy of Renton DPpartment of Corrrrr:unriy& Econcmfc Development Adrrrinislrative ShoR Plai Repert&Decision
ZKSNORTPLAT LUA23-�01564;SNPI-A
Report of April 3,2014 Page 5 of i7
Poiicy LU-158. Net development densities shoufd fall within a �ange of 4.Q to 8.0
✓ dweHing units per acre ir� Residential Single Family Neighborhoods. The propo�ed ��I
density would be 8.11 du/a. The proposed density i5 within the preferred range. '
Objective CD-C. Promote reinvestment in and upgrade of existin� resident+af ,
neighborhoods through redeveiopment of small, underutiiized parcels with infill
✓ development, mod+fication and alteratio� of older housing stock, and improvements to '
streets and sidewaiks to increase property values.lnfill developmenf will ottur, as will
frontage improvements along NE 7`h Street. I
Policy CD-12. S+dewalks or walking paths should be provided along streets in established
neighborhoods,where sidewalks have not been previously constructed. Sidewalk width �
shouicl be ample to safely and comfortat�ly accommodat� pedestrian traffic and,where '
✓ practical, match existing sidewalks. The projeci proponent will construct a sidewalk '
olong the public streei frontdge.Sidewalks on either side of NE 7`h Street on this 61ork ;
are being provided os new infill development occurs. Compliont becnuse sidewalks will I
be provided.
Policy CD-14. Infill development, defined as new short plats of nine or fewer lots, should ,
✓ be encouraged in order to add variety, updated housing stock, and new vitality to I,
neighborhoods. New housing stock wilt be provided.
Policy CD-15. Inf�ll development should be reflective of the existing character of
established neighborhoods even when designed using different architectural styles, and
/or responding to more urban setbacks, height or�ct requirements. Infill developrnent ,
Note should draw on elements of existing development such as placement of structures,
tiegetation, and location of entries and walkways,io reflect the site planning and scale of
1 existing areas. Proposed lotsizes are generolly smaller than exisring lots,although
recent similor subdivision of land in the area rreated similar-sized lots. Detailed site
ond architectura!designs, which would be reviewed to determine compatibility with
the confext of the si[e, are not yet ovpilable.
2. COMPLIAIVCE WI7H THE UNDERLYING Z�NING DESlG�VATIOIV: Objectives and policies of the
� Comprehensive Land Use Plan RSf designation are implemented by Residential 8 zoning (R-8�.
i RMC 4-2-110A provides development standards for development within the ft-$zoning
classification. The proposal is consistent with the following development standards if a11
conditions of approval are met, unless �oted otherwise:
Density:The minimum density allowed in the R-8 zone is 4 dwelling un+ts per net acre
(du/ac). The max+mum density permitted in the R-8 zone is 8.0 du/a. Net density is
calculated after the deduction of critical areas, areas intended for public rights-of-way,
and private access easements. Calculations for minim�m or maximum density that
� result in a fraction that is 0.50 or greater shall be rounded up to the nearest�vhole
number. Those d�nsity calculations resu!ting in a fraction that is less than 0.50 shafl be
roundeci down t�the nearest whole number.
The gross site areo is 28,635 sf.A deduttion vf 7,285 sf for the private access ensement
results in a net sife area of 21,450 sf(0.49 ac). Therefore, ihe density�vr the proposed
project is 8.12 du/ac.
Short Plat Report_13-0DI564.doc5b4
� Gtx of Renton Depaitment of Community&Economic Development Admrnistrotive Sh,ort Plot Report&Decision
ZK SNORT PLAT l UA13-002364;SHPC-A
Repo�t of Ap�il 3, 2014 I Page 6 of I7 j
Lot Dimensions: I
Proposed Lots !ot Size Width Depth I,
5,000 SF minimum 50 feet minimum 55 feet minimum
✓ Lot 1 6,910 sf 73.1 ft 95.91 ft (average) ��
Lot 2 7,862 sf 82.1 ft 95.8 ft (average)
Lot 3 7,851 sf 82.1 ft 95.71 ft{average)
Lot 4 6,019 sf 61.8 ft 95.64 ft{averagef ;
Setbacks:Ti�e minimum front yard setback in the R-8 zone is 15 feet; minimum side yard I
is 5 feet and, if along a public street, as with lot l, 15 feet for the primary structure;the '�,
minimu m rear yard is 20 feet.As shown on the site plan jExhibit 4)all new houses �
+� would meet thP building setback reQuirements. lf the existing structures were ta I
remain, they would not meei the setback requirements from the new lot lines, 'I
therefore,staff recommends a tondition of approva!whereby the existing structures I
are io be remaved prior to the recarding of the Final Plot. �
Bui�ding Standards:The R-8 zone permits one single family residential structure per lot.
Accessory structures are permitted at a maximum number of two per lot with a
maximum size of 720 square feet each, or a maximum of one per lat with a maximum of
1,000 square feet. Accessory structures are permitted only when associated with a I
primary structure located on the same parcel of land. '�
7he maximum building height in the R-8 zone is 30 feet. Buildin�heiQht is based on the '
measurement of the vertical distance from the grade plane to the average height of the
roof surface.The �rade plane is the average of existing ground level adjoining the
Note building at exterior walls. Where the finished ground level slopes away from the exterior
3 walls, the reference plane shail be established by the lowest points within the area
between the building and the lot line, or where the lot line is more than 6 feet from the
building, between the building and a point 6 feet from the building.
The maximum buiiding coverage in the R-8 zone,for lots larger than 5,000 sf, is 35
percent or 2,500 sf, whichever is greater.
The maximum �mpervious surface area is 75 percent.
Suilding elevations, whirh would be used to determine buildrng height, have not been
submitted. They yvould be submitted far building permit review(complionce not yet
demonstrated�.
Landscaping: landscaping is required for all subdivisions, includingshort plats.A
detailed landscape plan must be approved prior to issuance of street or utility
construction permits. Landscape plans must meet requirements of RMC4-4-070,
Note +nclud;ng rninimum size requirements, i.e.trees at 2-inch caliper and shrubs must be
3 minimum 2 gallon size.
A ten foot-wide landscaped area is required along a!I public sireet frontages,with the
exception of areas for required crosswalks and driveways. This landscaped area shall be
Short Plat Repon 13-001564.doc564
� Crty oJ Aenton�epar[ment of Communi[y& Econom�c Development Admrnisfrat;ve Short Plat Repo,Z& Decisron
ZK SHOR7 PtAT L UA23-001564;SNPL-A
�eport of April 3,2014 Page 7 of 17
on-site and shall include 1 street tree and ground tover at a minimum.Two trees are
required in the front yard of each lot if street trees are not provided. Landscaping must
be installed prior to occupancy. The landscape p/an (Exhibit 5J indicates/andscaping
would be insiolled at the street frontage. The landscape plan musi meet minimum
standards.A landscope plpn,showing front yard/andscoping for al!lots, including
reyuired trees, must be submitted prior to issuance of street or u[iliry construction
permrts. Landscaping, that meets minimum standards,must be installed prior to
occupanty.
Tree Reteniion: Existing trees shall be retained where feasible. RMC 4-4-130 requires 30
percent of trees to be retained. If the required number of trees cannot be retained,they
must be replaced according to RMC 4-4-130H. There are 30 signifrcant trees(diameter
✓ greater than 6 inches f on the site. Frve existing trees wil!be removed from the utility
easement and access areas(not included in tree retention catculations)ond 7 trees
wou/d be retarned(Exhibit 5). Three trees are required ns replacements. Three new
trees are shown on the landscape plan.
� Parking: Off-street parking for 2 vehicles per residential unit is required. There is
suffrcient space to provide on-site parking as required on each lot.
3. DESIGN STANDARDS: Residential Design and Open Space Standards(RMC 4-2-115j are
applicable in the R-8 zone.The Standards implement policies established in the land Use and
Community Design Elements of the Compret�ensive Pfan. Compliance with Site Design Standards
must be demonstrated prior to approval of the subdivision. Compliance with Residential Design
Standards would be verified prior to issuance of building permits. The proposal is consistent with
the following design standards, unless noted otherwise:
f Lot Configuration: Lots should be configured to encourage variety within the
development. The layout of Lot 4 would provide required voriation in/ot configurotion.
Garages: The minimization of the visual impact of garages contributes to creating
communities that are oriented to people and pedestrians, as opposed to automobiles.
One of the following is required (some options are not listed here due to lack of site
feasibility, i.e. garages accessed from alley):
i. Recessed fram the front of the house and/or front porch at least 8 feet, or
2. Located so the ro�f extends at least 5 feet (excluding eaves)beyond the front of
Note the garage for at least the width of the garage, plus the porch/stoop area, or
3 3. Sized so that it represents no greater than 50 percent of the�vidth of the front
fa4ade at ground level,or
4. Detached.
The portion of the garage wider than 26 feet across the front shall be set back at least 2
feet.Building plarrs, which wou(d be used to determine visual impact of garages,hqve
not been submitted yet. They would be submitted for building permii review
(compliarrce not demonstrotedJ.
Note primary Entry: Entrances to houses shall be a focal point and allow space for saciai
Short Plot RepoR 13-OOZ56G.doc5b4 !
� City�of Renton Depar[ment of Community&Economit Development Administrative Short Plat Report&Decision ,
ZK SHORT PLAT L UA13-001564;SHPt-A I
Report of April 3, 2014 Page 8 of 17 '
3 interaction. One of the following is required: I�
1. Stoop: minimum 4 feet by 6 feet and 1Z inches above grade, or
2. Parch: minimum 5 feet deep and 12 inches above grade.
Exception: An ADA accessible route may be taken from a front driveway. 8uilding
designs, which wou/d be used to evaluate design of entrontes, have not been ,
submitted yet. They would be submitted for building perm;r review(compliance noi
demonstrated).
Fa�ade Modulation: Bui{dings shall not have monotonous facades along public areas.
One of the following is required:
1. An offset of at �east ane story that is at least 10 feet wide and 2 feet in depth on
fa�ades visible from the street, or
tVote
3 2. At least a 2-foot offset of second story from first story on one street-facing fa4ade. I
Building designs, which would be used to evvluate design of fa�ades, have not 6een
submitted yet. They would be submitted for building permit review(compliance not
demonstratedJ. I,
Windows and Doors: Windows and front doors are an integral part of the architectural
Nate character of a house. Windows and doors shall constitute 25 percent of all fasades '
facing street frontage. euilding designs, which wou/d 6e used to evaluate design of
3 windows and doors, have not heen submitted yet. They wou/d be submitted for
building permit review(compliance not demonsfratedJ.
Scale, Bulk,and Character: Neighborhoods shall have a variety of home sizes and
character. Abutting houses shall have differing architecturaf elevations. Building
Note designs, which would be used to eva/uate scole, bulk, and character of structures, hove
3 noi been submitted yet They would be submitted for building permrt review
(compliance not demonstrated).
Roofs: Roof forms and profiles are an important architectural component. One of the
following is required:
1. Hip or gabled roof with at least a 6:12 pitch for the prominent form of the roof
Note (dormers,etc., may have iesser pitch, or
3 2. Shed roof.
Building designs, which would be used to evaJuate roof forms, have not been
submitted yet. They wou/d be su6mitted for building permit review(compliance not
demonstrated).
Eaves: Eaves and overhangs act as unifying elements in the architectural character of a
house. Both of the following are required:
Note 1. Eaves projecting from the roof of the entire building at least 12 inches with
horizontal fascia or fascia gutter at least 5 inches deep on the face of aVl eaves, and
3
2. Rakes on gable ends must extend a minimum of 2 inches from the surface of
exterior siding materials.
Building designs, which would he used to evaJuate design of eaves and overhangs,
Short P1af Report 23-OQ2564.doc554
• C!fy of Renton�eponment af Community&Economic Developmenr Administrative Shori Plat Repori&Decision
ZKSHORT PLA7 LUA23-001564;SNPL-A
Report of Aprii 3,2014 ?age 9 of 17
have not been submitted yet. They wou/d be submitted for building pe�mit review
(complionce not demonstroted).
Architectural Detailing: Architectural detailing cor.tributes to the visual appeal of a
house and the community. If one siding materiai is used on any side of the dwelling that
�s two siories or greater in height, a horizonial band that measures at least 8 inches is
�equired between the first and second story. Also, one of the following is required:
1. Minimum 3-1/2 inch trim surrounds a!I windows and details alf doors,ar
Note
2. A tombination of shutters and minimum 3-1/Z inch trim details all windows and
3 minimum 3-1/2 inch details a41 doors.
Building designs, whrch would be used to evaluate architectural detailing, have not
been submitted yet, They wnuld be submitted for burlding permit revJew(tompliante
not demonstratedJ. !,
Materials and Color: A variety of materials and color contributes to the diversity of �
housing in the community. Abutting houses shall be different colors. Color palettes for all
new dwellings,coded to the building elevations, shall be submitted for approval.
Additionally, one of the following is required;
1. A minimum of 2 colors shall be used on the buiiding(a main color with different
Note trim color is acceptable),or ,
3 2. A minimum of 2 different siding materials shall be used on the building. One siding
material shall comprise a minimum 30 percent ofthe street-facing fa�ade. If
masonry siding is used, it shall wrap the corners no less than 24 inches.
Building designs, wh;ch would be used to evaluate material and color choices, hrrve not
been submitted yet. They wou/d be submirted for building permit review(compliance
not demonstrated).
4. CQMPLIANCf W1TH SUBpIVIS10N REGULATIONS: RM�47 Prnvides reviPw GritPri� fnr
proposed subdivisions, The proposed project is consistent w th the following subdivision
regulations if all conditions�f appr�val are complied with:
Access: Each lot must have access to a public street, private road, or by a private access
easement per the requirements of the street standards. The newlots would be
� accessed from a residential access street within an easement.Staff recommends a
condition of approvpl statinq that Lot 1 shal/have vehrcle access from the new
residentia/otcess street, Newport Court NE(Exhibit 10), and not from NE 7t�'Street.
This condition shal!be recorded on the face of the Finol P/at.
Streets: Installation af curb, gutter, 8' wide landscaped planter,and 5' wide sidewalk, on
the full frontage ofthe parcel along NE 7�h St i5 required. The 0.5-foot wide curb is
outside the 8-foot wide planter. Additional right-of-way dedicati�n is not required on NE
tvote ?`h 5t�eet. A 25-foot wide paved surface is reguired on a residential street such as NE 7`n
1 Street.
The proposed residential access street has an easement width of 26 feet ana has a paved
width of 20 feet and minimum pavement thicknessns of 4" of asphalt over 6"of crushed
rock.
Shorr P��:RepOR_13-OOISb4.doc564
, Cit`of Renton Department of Communrty&Fra�omic Development Adminrstrative Short Plot ftepert&Decision
ZK SHORT PtAT LUA13-OOISS4;SHPL A
ReporC of Aprii 3,2014 Page 10 of 17
A hammerhead turnaround is proposed for tne residential access street. Ail four lots o{
the short pfat are proposed to gain access via the residential actess street.
A raad name and address sign wi11 be required to be provided by the developer prior to
recording.
Parking will not 6e a{lowed on the 20-foot wide paved, residential access street and "No
Parking" signs are required to be installed by the developer.
All electrical, phone, and cable services and (ines serving the proposed development
must be underground. The construction of these franchise utilities must be ins�ected
and approved by a City of Renton inspector priorto recording the plat.
A minimum o{5 feet separation ss required between access and property lines.
Fixed objects that may be situated in the location of the proposed a�cess must be
relocated, after abtaining owner approval.
[Infarmational comment—traffic safety guidelines rnention a minimum of 20 feet
between driveways.J
Blocks: Blocks shall be deep enough to allow two tiers of lats. No new 6locks wou/d be
��a farmed.
5. AVAILABILITY AND IMPACT ON PUBLIC SERVICES:
� Poiice:The Renton Police Department has commented that the proposed project would
have probable minor impacts.
Fire: Sufficient resources exist to furnish services to the proposed developrnent,subject
te the condition that the applicant provides Code required impravements and fees.
Fire department apparatus access roadways appear adequate. For sufficient access,
rcadways are required to be a minimum of 20 feet wide, fully paved,with 25-foot inside
and 45-fovt outside turning radii. Fire access roadways shall be constructed ta support a
30-ton vehicte with 322-psi point loading.
The fire flow requirement for a single-family residence is minimum 1,DOD gpm for
struttures up to 3,600 sf(including attached garage and basement)_ �f dwelling(s) exceed
� 3,600 sf, a minimum of 1,500 gpm would be required.
A minimum one fire hydrart is required within 3�0 feet of the proposed buildings and
tv��o hydrants if the fire flow requirement increases to 1,500 gpm. Existing fire hydrants
can be counted toward the requirements as long as they meet current code incfuding 5-
in�ch "5torz"fittings, which they currently do not have. Fire Impact Fees sha11 be poid
prior to issuance of building permits. 7his fee is nssessed per new single family lot at
the�ute in ploce at the time the building permit is issued. As of the dprte of this report
tire fee is�479.28 per new single family lot. 7he fee shall be paynble to ihe City as
specified by the Renton Municipal Code prior to 8uilding permit issuonce. Credit�vould
be given for one existing residence.
Schools:The Renton School D+strict has verified that exisiing schools would have
� capacity to accommodate the anticipated increased enrollment from the proposed
pro�ect.Srudents would attend Highlands Elementary School, Dimmitt Middle School,
5rrort Plo:Repori 13-001564,docSti4
' G�ty of Renton DepaRment of Community& Economic Developmeni Administrutive Short Plot Rzpart& Deusicn
IK SHORT PLAT LUA13-D01564;SNPL•A
Repart of April 3,Zd14 Page 11 of 17
and Renton High School.
5chool Impact fees shall be paid prior to issuance of building permits. This fee is
crssessed per new single fomily lot ot the rote in place at ihe time the building permit is
rssued. As of ihe date of this report, the fee is$5,455 per dwelling and shal!be paid
prior to building permit issuance. Credit wouid be given for one existing residence.
Highlands Elementary School is iocated on NE 7`h Street, west of the proposed short plat.
With the exteption of a very short distance, between the project site and the next street
to the west (Monroe Ave NE),there are sidewalks between the site and the school.
Students would be transported by bus to �immitt Middle School and Rentor� High
5�hool.Safe routes io schoo/s are available.
Parks:Although there would be no significant impacts to the City of Renton Park System
anticipated from ihe proposed project, an impact fee is required of aJl new residentfal
development.
� Park impaci fees shall be paid prior to issuonce of building permits. This fee is assessed
per new single family!ot at the rate in place at the time the building permit is issued.
As of the date of this report, the fee is$953.01 per dwelling. Credit wou/d be given for
one existing residence.
Stormwater:There is no stormwater control system in NE 7''`5t. A drainage report
;Exhibit 6) and a storm drainage plan (Exhibit 7} both prepared by Offe Engineers, PLLC,
�Nere submitted for revie�v.The drainage repor[ is requ+red to be based on the 2009
Surface Water Design Manua�Amendment and the 2009 King County Surface Water
Orainage Manual. Based��n the Cit�/s flow contro! map,the site falts within the Peak
Rate �low Control Standard, 6cisting 5ite Conditions. The drainage report mentions that
the developed runoff frori the project is less than 0.10 cfs from the existing runoff, and
thereby does not require a detention faeility. The drainage report also mentions that the
project does not add 5,000 square feet of new impervious surface and therefore does
not trigger water quaiity. The preliminary check fo�the total amount of new pollution
generating impervious area does indicate that just over 5,a00 sf area will trigger the
water quality requirement. Core Requirement#8 will apply to the p�oject. Individual lot
,� stormwater BMP's are proposed for the project.
7he drainage report subrr�itted with the construction permit must include all the core
requirements and the special requirements. Drainage plans and a final drainage report
based on the City adopted 2Q09 Surface Water Des�gn Manual Amendment and the 2009
K�ng County Surface Water C�rainage Manual are required to be submitted with the
Utility Construction permit. All stormwater reqliirements as per the 2004 Surface Water
Design Manual Amendment and the 2009 King County Surface Water Drainage Manual
are required to be provided by the project.
� geotechnical report prepared by PanGE Incorporated was submitted wfth the land use �
application. The geotechnical report states that the 5oil is not suitable for infiltration. ��I
Stormwater drainage plans for rndividuol lotr will be required�fior to issuance of �I
construction permits. The Surface Water System Development fee, at the date of this '
Short Plai Reporr_13-001564.doc56�
� Crty pf Renton Deportment of Community&fconomic Developmeni Adminisfrative ShoR Plot Report&Decision '�
ZK SNORT PLA7 LUR13-001564;SHPL-A
Report of Apri13,2014 Page 12 of 17
repvrt, is$1,228 per new lot. Fees are pQyable prior to issuance of the construction
permit. Credit will be given for the existing house.
Water Servite:The praject proposes the e�ctension of an 8-inch water rnain within the
pr�posed private road from the existing 8-inch water main in NE 7`h Street to the
proposed new hydrant. (Exhibit 8)The project proposes the addition of a new 4-inch
�vater main from the proposed hydrant ta the south property line of proposed Lot a. !
Fire hydrant requirements shall be as per fire department requirements.
One inch size domestic water meters are to be instal�ed to each lot. 7he existing 3/< inth
� water meter may be used to serve lot 1.
Civil engineering plans for the water main extensian will be required and must be
prepared by a registered professional engineer in the State of Washington. I
Separate water meters shall be provided to each loi. Credit mny be given for the
existing house. The project is subjed ta Water System De�+elopment charges, meter
installation fees, and related permit fees. The 2014 rate far 1 inch water service is
$2,8�9.00.
Sanitary Sewer Service: Sewer service is provided by the City of Renton.7here is an �
existing 8-inch sewer main in NE 7t�Street. The project proposes the extension of this
se�,ver main within the private road from the ex'rsting sewer main on NE 7"'Street to the
south property line of proposed Lot 4. {Exhibit 8) A manhole is required to be provided
at the end of the proposed sewer main in the private road.
Individual side sewers will be provided ta serve each lot. Side sewers shall ha��e a I
minimum 2 percent slope. �i
The System Development fee (SDCj for sewer is based on the size of the new domestic I
� water to serve each lot. The Sewer SDC fee �2014 rates) for a 3.�-inch or 1-inch meter ',
instail is$2033.00. These fees are collected at the time a utility construction permit is '
issued.
T�e East Renton Special Assessment District (SAD) fee is applicable on the project. The
current rate of ihe SAD fee s$316.18 per lot.
Sanitary sewer stubs sha!!be provided to each new!oG Credit may be given for the
exisiing home if previous�y.connected to sewer. Fees are payable prior io issuunce of
the construrtion permit.
Transportation: Impacts to the city transportation system are expected, due to
increased veh;cle trips to and from the proposed pro;ect. The Transportntion lmpact fee
' ✓ would be calculated and assessed at the rate in effect vvhen the building permits are
issued.As of the dare of this report, the fee is$1,430.72 per dwelling and sha!!be paid
prfar ro building permit issuance. Credit would be given for one existing residence.
5hort P1at Report .23-O�I564.doc564
• CKy of Renton Department of Commur.ity&Economic Development Adminisrrotive Short Plot Report� �)ecision
ZKSNORT PLAT tUA23-001564;SNPL-A
Report of Aprii 3,2014 Page 13 of 17
l. FIIVDlNGS:
Having reviewed the written record in the matter,the City n�w enters the foilowing:
1. Request:The project proponent has requested approval of a short plat subdivision of a 28,b35
sf(0.66 acre) property in the Highlands into 4�ots suitable for development with single-family
residential structures.7he project would have a density of 8.12 du/a.
2. Application:The property, Iocated at 3402 NE 7th St, is owned by Chris and Beverly Pressey.
The appGcation was submitted and determined complete_ The review perioc�for the
application, however, exceeded the 120 day period allotted such review by 19 days.
3. Comprehensive Plan:7he property has a Comprehensive Plan land use desig�ation of i
Residential 5ingle-Fam+ly(RSF) The proposed project furthers the objectives and policies of the
RSF section of the Land Use Ele:nent of the Comprehensive Plan.The objectives and policies of �
the Community Design Efement are also supported by the project as it has been proposed. ',
4. Zonin�: Objectives and policies of the RSF desig�ation are impiemented by standards and �I
reguiGtions of the Residential 8 zone.The project, as proposed, meets or exceeds:he R-8 zone
standards and regulations. I�
5. Subdiuision Regulations:The short plat, as proposed, would meet the requiremerts of RMC 4- i
7 Subdivision Regulations.
6. Existing Land Uses:The site has a single-family residential structure and detathed garage, I
construtted in 1950, that would be dem�lished.
7. Setbacks: Minimum setback requirements would be meL
8. System Devel�pment Charges: As of the date of this report the Surface Water 5ystem
Development Fee is$1,228 per new 1ot; the Water System Development Fee 1-inch water
meter install is$2,809; and the 5anitary Sewer Sy;tem f�evelopment Fee for a 3/:-inch or a 1-
inch water meter install is $2033 per new iot.
9. 7he East Renton Special Assessment District (SAD) fee is applicable on the project. The current
SAD fee is$315.18 per 1ot.
10. Publit Utilities: Impacts to public services are assessed on a per single-family dwelling basis at
the impact fee rate in place at the time the construction permit is issued. 7here are sufficient
services available to serve the proposed plat.
11. Safe Routes to 5chools:A safe pedestrian route,with sidewalks, is available between the
project site and the elementary school, Highlands Elementary. Students attending Dimmitt
Middle School and Renton High School would be tcansported by bus.
1. CONCtU5JON5:
1. The subject site is designated Residential Single Famity tRSF)in the Comprehensive Land Use
Plan and complies with the goals,objectives, and policies established with this designation.
2. The subject site is zoned Residential 8 (R-$j and complies with the zoning and development
standards established with this designation, provided the applicant complies with the Renion
Municipal Code, mitigation measures, and tonditions of approval.
Sl�o�r�lct Report I3-Q0156�.doC564
City oJ Rentan Deportmen!of Com,munrty&Economic Developm.enr Adn�inistrut'rve SYrort Plat Report& Oe�isinn
ZK SHORT PCA 7' L UA13-00156d;SHPL-A
• -
Report of April 3, 2C24 Pag2 24 ai�7
3. The proposed 4-lot shQrt plat complies with ihe subdivision regu�ations as established by City
Code and state law provided all advisory notes and canditions are complied with.
�. The proposed ZK Short Plat corr�plies with the street standards as established by City Code,
provided the project complie� wii� afl advisary notes and conditions oT approval c�r�ained
herein.
![. aECISlON:
The ZK Short Plat, Fife No. LUA13-OD15b4; SHPL-A, is APPROVED, subject to �ne�ting th�e following
conditions:
I. The existing house and detached garage shali be remavea from the s+te }�rior to recordi�g
the Final Plat.
2. It shall be re�orded on the Fina! Plat ihat Lot 1 shall have vehicle access from Newport
Court NE.
DECISION ON LAND USE AC7ION:
SiGNATURE:
�.��' l �C.� � ,� j�
C.E. "Chip"Vincent, CED Administrator� Date
7RAAISM117E0 this 3`tl doy of April,20i4 io the ContoctjAppliCantjOwner(s)�
C7wr+er/Applrcant/ContacE:
Cnris 8 8everly Pressey
F.O. Box 40373
5p!levue WA 980I5
TRANSMl�ED this 3`�day of April,2014, to ihe P�ries OJ Record:
.'etf and Stephanie Schaev.�e
3?01!V�S"'St
Renton WA98058
tRANSMlJ7ED thrs 3`d doy oj Aprr1,ZfJ1�1, to the joNowrny:
Ne;!Udotts, D2velopmentServices Director
_•'an Conklin, Develapment Services
;'2nnifer Nenning,Plonning Drrector
4'anesso Dolbee, Planning tvlonoger
F;re Mar>hal
L. tAND USE ACTJON APPEALS, REQUE57 FOR RECONSIDERAT/ON, & FXPJRATION:
The administrative (and use decision will become final if the decision is not appealed within 14 days of
the decision date.
Sneri°�o�Repor 33-OD1�5�.a^��b=:
. � Rf
e erence 11-A
� sE smr st
Flow Control Standards
�Peak Rate Fbw CoMml StandaN(Existing Site Condilions) �
� - MeM�S��e Way `J FbwControl Ou25on Standard(Existing Site Conditions)
SE 72nd St "
� ir p �Fbw Control Duration Slandartl(Forested Condtions)
2' j� 5
�F � � �.. -Flood Problem Fbw
F,` ii' � �a :'m ��
¢' F C;Unincorporated qng County Flow Contrd SGndards
1 'i _ -� , ',.
�� . � L..�1 Renton City Limi4s '�.
� � t
� L���PotmtialMnexationArea �i
I _ � � �
�\ �� _ L
%_ .�:,,. � - '
! a �
.
! � �
.
� '� .---""_----� ;�. -•, `- - �
:
��'�- �•-�� "_"_'4 N '- ' ,,
`�- ��,,,�' � � f j �''E �
�v�$ 1� � � �
�'OZd:�.} y � ..
�`,P.;r-e4 \
� n r _F %` # �
P�o �, � � , .Z � a
'�`� �'� y' j y �
�� � ��.. �..�.A• . a e'� _
..�a�`� r� §ra.�/�`- Jcv 1900
1'�+�.r.!`� t�wiSJ.q 5 u ` ��a; �
� �'�B.�t�d`6 S��i a���•�a�rFg: "�''_' z `� a \ - S .
< � �i �� W F
���,���ag' �"�?_"�P� .` ,-_ � N 3th 5t ° �Q _ - ' uwi Re�fO?Issa9uah Rd .i
����'�'�*������ � �- ¢ � �'" � � �`� � � ~
, � _ � �
���-._ R Z ; �y �.� �-�-� �;
� �4''�n � � .� � ' � .' ��� 'R �-''�g ` � �. :,� .
� Y .
�#u`�4:#.:�^_C . J . ` .v _-. , . . -__�}'r •
t _ r� n _ �-_'_'-'_'_� SE 1281h St
f `�o. �` - `��/ G ��_.r--•5 � ��_ -----t
Z
�r � � t�—' C ���
_ . � � ---�` ` � `� ���
�t �, � � = _ ti ��,f � ���.
', ' S����,s�" �'� 4�
^�, (� � � ���
c�-e� �y �`�'i-aos Fwv . . � .. �! ��i-- 1�-4ti.� �¥;fi '" �
�S_. � `f r cJ i r� � . .
•� �'�S� ���t.�,� ' _ ,.ry�,
� �- . `'�-. '�cy.e
� i �,iSq ple'.alley Rtl 769 __
1 � ��-f`__' '�a � �� � i
jQ s�v znn sf - -. .�;f.�� ,
r �:.
� 3 � '° ; � �F_ v����,y�$ r�
I� _ � ` �`�, - �-'t ,s�',� Y� ,,��,#e�+��,tiJ•!ra
�� jF o s/vy aam s� ? ,�,J .� ��`�•,�����'��P�+.
,''�m R / w �� � � �t.�.a4/ ���q�c��. �
1iinn ��q�f
f3 ; J, �,SNJ 41s;St � u.:: _ �a�'����„T�a"e��.�+
� - . � 4f������ .
� -�isotr.st i..'��.._�'�w,F�..._.~ i:� - � � �'C�.tti���� �: ��
��\` ,T�' , ,� �.� �::�+S��s�`.: � ����i
l � a�, • '��m `� r--� '��„��,���----=`�.�...�'�'�`'��:f�'..; 'sJ��.
l �,.,� s."� � �� �'I�'a�1�'�
_ ��� y � +�f�
.r.�. ._.ti.._ ....�;;���.�`��,������. :`�5�
:� �,���=���,�� r��yr� �
� ,e'� F .
:� � <� � 6 � -
e
d
N _ ,�������� ��
� m � _ - , - e �'���� �`�•
> � "�.,�:�:�e,
Q Q � 3": d+: a
� � t67 _ _vkE � �ake
t
`Q,_ �J o ( ,� �� .- voungs
�-� r w t`
`�5E 208th Sl � I
� y � I
s nr s; �
Flow Controi Application Map Date:01/0912014
w�E 0 1 2 —� � � .
Miles
5
. .
- - - - .
�
� . ..,.,
a.....
� �
i .i►2::
�
� t
�.
�:
�L'���'�i':
..s�,4��is•�`
�!�w� !�O�
���_ '�'�` 6S:<
,� k'�'�d..'�'�..,�M.��f;•� ` �"qr,�r;.�
. �: .-. -rp
sr�• � � ✓�s�',�`.�.
:s��9 .► �i' �s�t
'' ' , �: '���� �� .R�
` '`r >.,, .y c •.;�d ,t's� 0� � o �
� �� ���e��'�5�+•�s'� � ������� :�
��� _:�:�•�+�O�o°��i�•'�< '.•v!
��:� y�� �O� �ae�•���i+` � '�`.e'�
��������,�� ,.�
- -� , . ,
► i `'.,.����� :� �
�,. •.
_ ^�.
, - �►r _ .
.
. :c
;�. �, �,,,••s;•,��'�:�
' � .�; .�i�0• •OP�:�d0�'�►"i
��i i` .-r• .3�!s�3�Oi�i���*��������0!�
♦ ♦���a �'�' 6���i�i�i��
��� � �ii+••`! >`�•F�OSi'R'i Oi����i0
�-�c_-:4i .S►i ♦���i�����������_.
�•� � �%�i!'i'.+�������i�0i�i�i.`
O1i � w ' ' �. ��y.��i��'i'�������������
�4 ti�-.. �)�=��a�`��`+��i�����i��i
% �/�► ;--s'' .e-•A ��Y'yrys�' �i�Oi���'
��� �,�o. �►'i. ♦ �
� � • :����r��-•�.�'�:y'�!i���,�� �Z♦
� v'�s�.���
' . •. �`�y., � r� .,o .
.y. w.�_p,•,r��•!•iO•�� • ,
�A�'���y"�'�•�•�:�t�i�1 ��_i �
� - - �i♦�,1"� '- •
-.;;�,''rr'�:. .
...mo... �
.......
- ❖.❖.•r�► �
,.,.,.,.�.,.,., � �
.,..�..,., '�,►. .<
_ .� - . ��������.�
aos . `���i�i�iO�i��♦ ��i�i�
O�O�i��0�0`O��iO� � `� `
�.=_ _=°s �� � �:ia�i�i�i�i�ii�i�i���
�.; � ♦������♦ O
��.��•����
��r��������
i
' t'
� !
' ��
� ���� �
�� _
!
� � ry� s- ��r--•�i�i�i�► r v����y�����r����
� - .d���'.�.�'�.�'�.�w�._. .•r❖�:❖•:.•gOc
1'�:�titiii4`4�J'�}�!i;i ��'i�i��'%i!y����i"i����►.r�� �i'i�i
`9�i�i�i�'Oi��i"•: , O� ♦�i.♦ •y�4'�i •����
�9��i�O�r'��s�itii� ' ����iso'a� ��ia���fiti �����ib��i��i
�9♦ ♦�.��� 6 ♦ o��,O����i s�d •����
��;�`�i��i����ps`s�i�i9� s • i� �����'��i. �° � •��i��
♦.���eI1�Y� :* ♦ �ti�i � )����� ♦
•-� �i'6�:i��f►��` . �!y.�. � ♦���• i
'��►�s � O�• ��i�1���y�����������
6�4��c�i� �`:• . r ♦+oi�i:>�i�i�i�i�i
`�` ��i�i O�i'�.� e°�i�"i y�.�,.���►9�`�OO���i�
�����a ����>'s �i♦ . ��y. �i�O��i�i
.� �s i�$��� �ii • .���A`i��y00��..�
�• • i 4�4'• •�;
_. `d.ra. �. ,�,�.� �=r•• e
.. - � �• � .
� � � � � � � � I � .
� �' ' eriton•
�� _ �
,:,,. .
\� s� � p _'�.' n �a �. . �, v I
�`.., �
� Y ' � 3 � 9 �a € t � �� 1 n•., ,;� 3 �,;
� �
��. �� % y ♦ �,�`s, m.� � w �v � � �I'�� 7 �, �, N I
; Y<m ,, , ��f ��„ti�air�� � � � ' �� e,
1�[�(�� y ��,
� x a � � � �
� < i� � _ �
i . „� nY �� � ) 9' 1' .\_ ` ....I�.. _ �... s �1 . . ';�
y \
{
N p�p \ �'.
ti � a d' �a � � � £ ''�`� ��7 ti � ( i�A ����,�.; � f�' ���� � ..�� �f��?: �, j � ;�� d
.�..
� �(�11111���"� ;` ' ��� r � ._ _7_ ,\;� ' a- -�1', ! ,..�-,-� o •
;�� - - � ;:�„ �, �:,` . . �°�'
� �°2 4 �' � f b d �8 � - ' ;�� f;, *� ....,.,.,r._„,_,
� ���_@�'���j����,� i ` ` � \ `� \� �,� ; ,� �
� � S w w �i � F � 4 • .- . .� ��� ��\�` \\\.\ '•�� `� �4 � [� . �
p�+�^, - �' -�1:�,'•.`Nal�.}J l�!.. �� � :.�
�_i '�I��� i�� �' 1 �.��\� \.���\�' \ � #°+ °�'�� '------- ———Y�w����r. ��, ^��'.=�
,� ,
�� i � � � � f � w � :�\. � ;;,��� \���.��,�� ����\'� �' r\ �a` ` d �._ � ��.�..
�k':� �1� � l�;�i��' � u��` :\��```;� �;\�\\����\�,\`\ ,, �,`-�,�`��\� � �,��,��°"�a�'�' ��� .����x �
z � '� . .� �� '\�� '�"> i . m, �� �^ ti .� Iw �
� " � -� �'����� . � ����\ ��� �� � . ,�� _ �' � , � a. �� �a;
S � � Q� � .�� \ �`��\\��\\ �\ \\ ��� � �� _ ��� 9.
! [ �m1 � \ \ � \ �` � . +^�n, k�P` � `
� � ,9 �9 �t I \\ . �.�\}\\h� � � `� \� �`. ''� . �....�/ . - . 3 as,l: c• `•
�' Y ��a:�y.., � �. 1 \� \� � �\ \\\\\\�`�..\��\ ..\ \ � ,\ \.,,,\\�� .n`�' � *; , 5 i�jr� ��,1,',
� `._��� '�� �
�. gp � ,g`y �7�=4"��%r � \�
U � � a �� t �4 ���'�J� \4\\�� \�\, � \\�,� ��� ,� �\\ '' � r F � �� � a �'-
91 d � g � i:'7 1 �� r� � � �..\\ �d \\\ � ,\ �� t J++'� '
� � ^
o '� � � s n�� �' . . . � , iA� ��.,�\ \��� �`� �a � � �' ����\� ����\\ . ,wr �x c . �l,'���J
U 'R� ;� a�]R FF'�� �\' \ �\ _\ � ��'\ � � . .. . - �I ��FYuu 'Y�
� c� g ff S�i.,� ,�a,, '�;�.`� ��� �-� ��� �..+ei �����i�A�V���� �'. � �'�� a ��..��..a 41h7tb ,�r.
\ \, ��1 �.ry.
� iJ�'1� a 7 r., �\\ ��\����\\���`.\ \� \� \,_ 5��\\��\\\\\ \ � �. � .. .c . -.qj s � N
�, ,' , �\���\ �_ ;�� �� _� .� � :t
� � .�,• � \,;, , � �, ,` r, a�
^` ,\ �� � .\\\���`\ \�`,�\���'��� ��-��`��\�:��,\�� :, � � �
� \\ \ \\ .,\\''� ��`� �\l\\ \�•\ \ .��.�� . �'�9 �� � c�
W •.y,���: M;�;'�.. � � . \ \ \ `� ` 1Ri\r\,s'e\ \ ��\ ,� k\ 'ti.*��,\`�\\�yR.;.. f .� i l_ �.,p �
U , �,!.� ��,\�`. � � � � � � s
C ��;x��,� !� *���, � \. � i `��.>.�' � '� �` �a ! , �.
(V '�.�ii:� .+t�''4 �. ;��� �` M . �� �i'��<q � �` � _ . � � � � '` ���� ���
a, , `
� `• ` \\�\��\�� . �\�\� \a � �.. .,F � .4 y� a
� \ � ` � . ,;,
•�� �� � � �' \ � � �\ a . ,_ � l. . �:;�
�_ \ ++'
�' `•�\._.., \\ ` \ \ �.. � � �: __ � '_ P7�•; � . . _ \���� r '
..� ...� ' � "
�
'•'��/ � \ .. .7 ��� ' :" '� �\� .\\ � �� � �'<a . ti�� � �
LL '�� �:b \ \:� � �� \�\�� � �'R+ \�. �\ t '" ' ��;,; .\\ s
����.�3E��`{��� ���:i� � � �V�''�� �� �'-:Y ��
�� � ���\ \ �
���� '�6�;��"�� 1��.����� � � o �����., � . �S o4 i qFb��� ' , �� S
8� ���'mM '., �'\\\,e��.Y'���`i��� � `��������� ",t� ..h^ ' ' ��"�°�w�, l A_�J•y,....., .. .,! �A"�r'�..
., ,�h �i � r'^' ,,` r,4'�i...���\ \ �\ �1..� �I�h`�`�'° ^�y"`� _=�� _...�. .! �����:Q
� \ �. u y, � " � � �;.m,
.- a � w �� ;'2 � - � � . �" . .-'� \ ,a��t�a`�..��k"�� � � ' j �f'%y? L�� s.," , ��ma,, �
P �� " rn �!� �y . � z��':� �� ���� i �. � �, .� * �' �r� ��a� �� � � � 4F SN�!4�
Y �P
3 ; � � � iP . p � . , }"��y._d �r � '�� .;N S q s 'on�V�lf�,�� �tlE s � �
, �.- t� � �
T¢� �`� 5 , �0 .�' � ,� � 'd �"f, K �
_ 1�� SF " 1�!m` . �1�. Y ' _�� ,{ Y ..�iow E f`. �� �y�a},'$.4�'��;���f�
�`� ��.�. � k�, . i� � ���� �q �{Y,' r � � _ � � i�Y".„y}l�
� , 1: S qtn �� .p{� .� 1� e � �i� h(l. �
2j � 1 . � � �� rr � � ����.�, � .$�`�.. � _..............�. �.1.�`1��..:'. � r� r««^^r',�, (Fp�s a"�""�;
_ N � . � ' �1 i .� s m� r; � ���s�"�n"�m `� Y Y ��i� �
.`t-�.` ' "t � a �sS* s�t , a �`-; ` P "r4
� , r� '' ,
� ,.
i n A�^. r
� F� �'������*� ( 1 4g
P,g�,. ! P` � , 1�;an� � '.��✓���++.�� `�'4V��'��aeu.�`}�P� ,s�al�t' � � � ry � t ,��� ■�
� �• 1 � • 7l�
, ..�m�e� ���� 1 c� `� '� �y ; ? . ' � p'� t '. k , , O �
`�'e 1 P��° \�-��..�.� � :t,���� -`� � �`�`'..,,, m a'7'hi ti. � ...p., /�y
�. ��
l_.�'���f'° �n��;� � � � , � � � �'� ���� �`t�'�m z � ,�� d. ' � 6
Q �..;�; ��.farr.;.,._� A, � . a.,a
Section 7: Other Permits
None applicable at this time
.
Section 8: CSWPPP Analysis and Design
The proposed development and improvements comprise of 0.66 acres of property. The actual exposed and !
"worked"area on the project will consist of widening NE 7"' Street and installing a private access road along
the easterly side of the property. This"open and worked"construction area will be 0.50 acres. All 'I
construction activities will be concentrated on NE 7th Street. The entire property is NOT proposed to be
graded and worked. Erosion control for the project will consist of filter fabric fencing along the easterly edge
of the new private road. The existing paved driveway will be used for construction entry. Therefore
minimizing disturbance to the ZK Short Plat can be accomplished. This will provide for more un-disturbed
surface areas to filter and minimize erosion runoff during construction. A temporary pond is not proposed
due to allow for minimal disturbance of the property.
There is an existing house and crawl space on the property that will be demolished under a separate permit.
The crawl space area will provide a localize depression if additional filtration is necessary. This area could be
used as a small ponding depression.
Section 9: Bond Quantities, Facility Summaries, and Declaration of Covenant
A Declaration of Covenant(Operation, maintenance, and restrictions) are provided in this section.
��
Site Improvement Bond Quantity Worksheet S15 Webdate: 04/03/2015 .
� King County _
Department of Permitting & Environmental Review
35030 SE Douglas Street, Suite 210
Snoqualmie, Washington 98065-9266 For alternate formats, call 206-296-6600.
206-296-6600 TTY Relay 711
Project Name: ZK Short Plat Date: 17-Dec-15
�ocation: 3402 NE 7th Street Project No.:
Activity No.:
Note: All prices include labor, equipment, materials, overhead and
Clearing greater than or equal to 5,000 board feet of timber? profit. Prices are from RS Means data adjusted for the Seattle area
or from local sources if not included in the RS Means database.
yes XX no
If yes,
Forest Practice Permit Number:
(RCW 76.09)
Page 1 of 9
Unit prices updated: 3/2/2015
Version: 3/2/2015
Worksheet 1.xls Report Date: 12/17/2015
Site Improvement Bond Quantity Worksheet S15 Webdate: 04/03/2015 ,
Unit #of
Reference# Price Unit Quantity Ap lications Cost - '
EROSION/SEDIME T CONTROL Number
Backfill &compaction-embankment ESC-1 $ 6.00 CY 130
Check dams,4" minus rock ESC-2 SWDM 5.4.6.3 $ 80.00 Each
Crushed surfacing 1 1/4"minus ESC-3 WSDOT 9-03.9(3) $ 95.�0 CY
Ditching ESC-4 $ 9.00 CY
Excavation-bulk ESC-5 $ 2.00 CY
Fence, silt ESC-6 SWDM 5.4.3.1 $ 1.50 LF 325
Fence,Tem ora NGPE ESC-7 $ 1.50 LF
H droseedin ESC-8 SWDM 5.4.2.4 $ 0.80 SY 2420
Jute Mesh ESC-9 SWDM 5.4.2.2 $ 3.50 SY
Mulch, b hand, straw, 3"deep ESC-10 SWDM 5.4.2.1 $ 2.50 SY
Mulch, b machine, straw, 2"deep ESC-11 SWDM 5.4.2.1 $ 2.00 SY
Pipin ,temporary, CPP,6" ESC-12 $ 12.00 LF
Pi in ,tempora , CPP, 8" ESC-13 $ 14.00 LF '
Pi in , tem ora , CPP, 12" ESC-14 $ 18.00 LF
Plastic coverin ,6mm thick, sandba ed ESC-15 SWDM 5.4.2.3 $ 4.00 SY 950 �
Rip Rap, machine placed; slopes ESC-16 WSDOT 9-13.1(2) $ 45.00 CY
Rock Construction Entrance, 50'x15'x1' ESC-17 SWDM 5.4.4.1 $ 1,800.00 Each 1 �
Rock Construction Entrance, 100'x15'x1' ESC-18 SWDM 5.4.4.1 $ 3,200.00 Each
Sediment pond riser assembl ESC-19 SWDM 5.4.5.2 $ 2,200.00 Each
Sediment trap, 5' high berm ESC-20 SWDM 5.4.5.1 $ 19.00 LF
Sed.trap, 5'high, riprapped spillway berm section ESC-21 SWDM 5.4.5.1 $ 70.00 LF
Seeding, b hand ESC-22 SWDM 5.4.2.4 $ 1.00 SY
Soddin , 1"dee , level ground ESC-23 SWDM 5.4.2.5 $ 8.00 SY
Sodding, 1"deep, sloped ground ESC-24 SWDM 5.4.2.5 $ 10.00 SY
TESC Supervisor ESC-25 $ 110.00 NR 20 O
Water truck, dust control ESC-26 SWDM 5.4.7 $ 140.00 HR
WR�T�"�� "�1"� �7 ir9M�kfk .g8�!�a e�� � � +,��.• � ���r��ti�'�� � ��a���v��i�b� �, , t 1� P�,Y §, , "� �S,�� .fie?'h�, 5� ? ��Ri��'a�� ;�+1 "� v7 ��I � "��
a 4 k��� 4 `'n;l',.»a a �. ,# ,`Y 1 i.t.�Hy io��¢ � ,� �', •�.: v�,i�il'.`-i � .7,l�iS:q4mVi,',
Each
ESC SUBTOTAL: $ ��f��
30%CONTINGENCY&MOBILIZATION: $ " I
ESC TOTAL: $ -
Page 2 of 9 COLUMN: � ��/�s �
Unit prices updated: 3/2/2015
Version: 3/2/2015
worksheet 2.xlsx Report Date: 12/17/2015
Site Improvement Bond Quantity Worksheet webdate: 04/03/2015
Existing Future Public Private
Right-of-Way Right of Way Improvements
&Draina e Facilities
Unit Price Unit Quant. Cost puant. Cost Quant. Cost
GENERALITEMS No.
Backfill&Com action-embankment GI-1 $ 6.00 CY
Backfill&Compaction-trench GI-2 $ 9.00 CY
Clear/Remove Brush,b hand GI-3 $ 1.00 SY
Clearin /Grubbin /Tree Removal GI-4 $10,000.00 Acre 0.1 1,000.00 0.5 5,000.00
Excavation-bulk GI-5 $ 2.00 CY 100 200.00
Excavation-Trench GI-6 $ 5.00 CY
Fencin ,cedar,6'hi h GI-7 $ 20.00 LF
Fencin ,chain link,vin I coated, 6'hi h GI-8 $ 20.00 LF
Fencin ,chain link, ate,vin 1 coated, 20 GI-9 $ 1,400.00 Each
Fencing,split rail,3'hi h GI-10 $ 15.00 lF
Fill&com act-common barrow GI-11 $ 25.00 CY 520 13,000.00
Fill&com act- ravel base GI-12 $ 27.00 CY
Fill 8 com act-screened to soil GI-13 $ 39.00 CY
Gabion, 12"deep,stone filled mesh GI-14 $ 65.00 SY
Gabion, 18"dee ,stone filled mesh GI-15 $ 90.00 SY
Gabion,36"deep,stone filled mesh GI-16 $ 150.00 SY
Gradin ,fine,b hand GI-17 $ 2.50 SY
Grading,fine,with rader GI-18 $ 2,00 SY 780 1,560.00
Monuments,3'lon GI-19 $ 250.00 Each
Sensitive Areas Si n GI-20 $ 7.00 Each
Soddin , 1"deep,sloped round GI-21 $ 8.00 SY
Surve in ,line& rade GI-22 $ 850.00 Da 2 1,700.00 6 5,100.00 ��
Surve in ,lot IocatioNlines GI-23 $ 1,800.00 Acre 1 1,800.00
Traffic control crew 2 fla ers GI-24 $ 120.00 HR 8 960.00 I
Trail,4"chi ed wood GI-25 $ 8.00 SY
Trail,4"crushed cinder GI-26 $ 9.00 SY
Trail,4"to course GI-27 $ 12.00 SY
Wall,retainin ,concrete G4-28 $ 55.00 SF �
Wall,rockery GI-29 $ 15.00 SF 885 13,275.00 �I
Page 3 of 9 SUBTOTAL 3,660.00 39,935.00 ��
Unit prices updated: 03/02/2015
'KCC 27A authorizes only one bond reduction. Version: 03/02/2015
worksheet 2.xlsx Report Date: 12/17/2015
Site im rovement Bond Quan#it Worksheet Webdate 04/03/2015 II,
P Y
Existing Future Public Private
Right-of-way Right of Way Improvements
&Draina e Facilities
Unit Price Unit Quant. Cost Quant. Cost Quant. Cost
ROADIMPROVEMENT No.
AC Grindin ,4'wide machine<1000s RI-1 $ 30.00 SY 204 6,120.00
AC Grinding,4'wide machine 1000-2000 RI-2 $ 16.00 SY
AC Grindin ,4'wide machine>2000s RI-3 $ 10.00 SY
AC Removal/Disposal RI-4 $ 35.00 SY 25 875.00
Barricade,t e III(Permanent RI-6 $ 56.00 LF
Curb&Gutter,rolled RI-7 $ 17.00 LF
Curb 8 Gutter,vertical RI-8 $ 12.50 LF 95 1,187.50 240 3,000.00
Curb and Gutter,demolition and dis osal RI-9 $ 18.00 LF
Curb,extruded as halt RI-10 $ 5.50 LF
Curb,extruded concrete RI-11 $ 7,00 LF
Sawcut,as halt,3"de th RI-12 $ 1.85 LF 105 194.25
Sawcut,concrete, er 1"de th RI-13 $ 3.00 LF
Sealant,as halt RI-14 $ 2.00 LF 105 210.00
Shoulder,AC, (see AC road unit rice RI-15 $ - SY
Shoulder, ravel,4"thick RI-16 $ 15.00 SY
Sidewalk,4"thick RI-17 $ 38.00 SY 47 1,786.00
Sidewalk,4"thick,demolition and dis os RI-18 $ 32.00 SY
Sidewalk,5"thick RI-19 $ 41.00 SY 33 1,353.00
Sidewalk,5"thick,demolition and dis os RI-20 $ 40.00 SY
Si n,handicap RI-21 $ 85.00 Each
Stri in , er stall RI-22 $ 7.00 Each
Stri in ,thermo lastic, for crosswalk) RI-23 $ 3.00 SF
Striping,4"reflectorized line RI-24 $ 0.50 LF
Page 4 of 9 SUBTOTAL 11,725.75 3,000.00
Unit prices updated: 03/02/2015
"KCC 27A authorizes only one bond reduction. V8rS1011: 03/02/2015
worksheet 2.xlsx Report Date: 12/17/2015
Site Improvement Bond Quantity Worksheet Webdate: 04I03I2015
Existing Future Public Private
Right-of-way Right of Way improvements
8 Dralna e Facilities
Unit Price Unit Quant. Cost Quant. Cost Quant. Cost
ROAD SURFACING No. 4"Rock=2.5 base&1.5"to course 9 1/2"Rock=8"base&1.5"to course
Additional 2.5"Crushed Surfacin RS-1 $ 3.60 SY
HMA 1/2"Overla , 1.5" RS-2 $ 14.00 SY
HMA 1/2"Overla 2" RS-3 $ 18.00 SY 204 3,672.00
HMA Road,2",4"rock, First 2500 SY RS-4 $ 28.00 SY 35 980.00 594 16,632.00
HMA Road,2",4"rock,Qt .over 2500 S RS-5 $ 21.00 SY
HMA Road,3",9 1/2"Rock,First 2500 S RS-6 $ 35.00 SY
HMA Road,3",9 1/2"Rock,Qt Over 25 RS-7 $ 42.00 SY
Not Used RS-8
Not Used RS-9
HMA Road,6"Depth,First 2500 SY RS-10 $ 33.10 SY
HMA Road,6"De th,Qt .Over 2500 SY RS-11 $ 30.00 SY
HMA 3/4"or 1",4"De th RS-12 $ 20.00 SY
Gravel Road,4"rock,First 2500 SY RS-13 $ 15.00 SY
Gravel Road,4"rock,Q .over 2500 SY RS-14 $ 10.00 SY
PCC Road Add Under Write-Ins w/Desi RS-15
Thickened Edge RS-17 $ 8.60 lF
Page 5 of 9 SUBTOTAL 4,652.00 16,632.00
Unit prices updated: 03/02/2015
"KCC 27A authorizes only one bond reduction. Version: 03/02/2015
worksheet 2.xlsx Report Date: 12/17/2015
Site Improvement Bond Quantity Worksheet N/ebdate: 04/03/2015
Existing Future Public Private
Right-of-way Right of Way Improvements
&Draina e Facilities
Unit Price Unit Quant. Cost Quant. Cost Quant. Cost
DRAINAGE (CPP=Corrugated Ptastic Pipe,N12 or Equivalent) For Culvert rices, Avera e of 4'cover was assumed.Assume erforated PVC is same rice as solid i e.
Access Road,R/D D-1 $ 21.00 SY
Bollards-fixed D-2 $ 240.74 Each
Bollards-removable D-3 $ 452.34 Each
"(CBs include frame and lid
C8T el D-4 $ 1,500.00 Each 1 1,500.00 !
CB T e IL D-5 $ 1,750.00 Each 1 1,750.00
CB T e II,48"diameter D-6 $ 2,300.00 Each 1 2,300.00
for additional de th over 4' D-7 $ 480.00 FT 4 1,920.00
CB T e II,54"diameter D-8 $ 2,500.00 Each
for additional depth over 4' D-9 $ 495.00 FT
CB T e II,60"diameter D-10 $ 2,800.00 Each I
for additional depth over 4' D-11 $ 600.00 FT
CB T pe II,72"diameter D-12 $ 3,600.00 Each
for additional de th over 4' D-13 $ 850.00 FT
Throu h-curb Inlet Framework(Add) D-14 $ 400.00 Each 1 400.00
Cleanout,PVC,4" D-15 $ 150.00 Each
Cieanout,PVC,6" D-16 $ 170.00 Each
Cleanout,PVC,8" D-17 $ 200.00 Each
Culvert,PVC,4" D-18 $ 10.00 LF
Culvert,PVC,6" D-19 $ 13.00 LF
Culvert,PVC, 8" D-20 $ 15.00 LF
Culvert,PVC, 12" D-21 $ 23.00 LF 159 3,657.00
Culvert,CMP,8" D-22 $ 19.00 LF
Culvert,CMP, 12" D-23 $ 29.00 LF
Culvert,CMP, 15" D-24 $ 35.00 LF
Culvert,CMP, 18" D-25 $ 41.00 LF
Culvert,CMP,24" D-26 $ 56.00 LF
Culvert,CMP,30" D-27 $ 78.00 LF
Culvert,CMP,36" D-28 $ 130.00 LF
Culvert,CMP,48" D-29 $ 190.00 LF
Culvert,CMP,60" D-30 $ 270.00 LF
Culvert,CMP,72" D-31 $ 350.00 LF
Page 6 of 9 SUBTOTAL 9,377.00 2,150.00
Unit priees updated: 03/02/2015
*KCC 27A authorizes only one bond reduction. Vet'SIOn: 03/02/2015
worksheet 2.xisx Report Date: 12/17/2015
Site Improvement Bond Quantity Worksheet webdate: 04/03/2015
Existing Future Public Private
Right-of-way Right of Way Improvements
DRAINAGE CONTINUED 8 Drainage Facilities
No. Unit Price Unit Quant. Cost Quant. Cost Quant. Cost
Culvert,Concrete,8" D-32 $ 25.00 LF
Culvert,Concrete, 12" D-33 $ 36.00 lF 15 540
Culvert,Concrete, 15" D-34 $ 42.00 LF
Culvert,Concrete, 18" D-35 $ 48.00 LF
Culvert,Concrete,24" D-36 $ 78.00 LF
Culvert,Concrete,30" D-37 $ 125.00 LF
Culvert,Concrete,36" D-38 $ 150.00 LF
Culvert,Concrete,42" D-39 $ 175.00 LF
Culvert,Concrete,48" D-40 $ 205.00 LF
Culvert,CPP,6" D-41 $ 14.00 LF
Culvert,CPP,8" D-42 $ 16.00 LF
Culvert,CPP, 12" D-43 $ 24.00 LF
Culvert,CPP, 15" D-44 $ 35.00 LF
Culvert,CPP,18" D-45 $ 41.00 LF
Culvert,CPP,24" D-46 $ 56.00 LF
Culvert,CPP,30" D-47 $ 78.00 LF
Culvert,CPP,36" D-48 $ 130.00 LF
Ditchin D-49 $ 9.50 CY
Flow Dis ersal Trench (1,436 base+ D-50 $ 28.00 LF
French Drain (3'depth D-51 $ 26.00 LF
Geotextile,laid in trench, ol rop lene D-52 $ 3.00 SY .
Mid-tank Access Riser,48"dia, 6'deep D-54 $ 2,000.00 Each
Pond Overflow S illwa D-55 $ 16.00 SY
Restrictor/Oil Se arator, 12" D-56 $ 1,150.00 Each
Restrictor/Oil Separator, 15" D-57 $ 1,350.00 Each
Restrictor/Oil Se arator, 18" D-58 $ 1,700.00 Each
Ri ra , laced D-59 $ 42:00 CY
Tank End Reducer(36"diameter D-60 $ 1,200.00 Each
Trash Rack, 12" D-61 $ 350.00 Each
Trash Rack, 15" D-62 $ 410.00 Each
Trash Rack, 18" D-63 $ 480.00 Each
Trash Rack,21" D-64 $ 550.00 Each
Page 7 of 9 SUBTOTAL 540
Unit prices updated: 03/02/2015
"KCC 27A authorizes only one bond reduction. V2I'SI011: 03/02/2015
worksheet 2.xisx Report Date: 12/17/2015
Site Improvement Bond Quantity Worksheet Webdate: 04/03I2015
Existing Future Public Private
Right-of-way Right of Way Improvements
8 Draina e Facilities
Unit Price Unit Quant. Price Quant. Cost Quant. Cost
PARKING LOT SURFACING Not To Be Used For Roads Or Shoulders '
No. I
2"AC,2"top course rock&4"borrow PL-1 $ 21.00 SY NA NA
2"AC, 1.5" to course&2.5"base cour PL-2 $ 28.00 SY NA NA
4"select borrow PL-3 $ 5.00 SY NA NA
1.5"top course rock&2.5"base course PL-4 $ 14.00 SY NA NA
UTILITY POLES 8�STREET LIGHTING Utili ole relocation costs must be accom anied b Franchise Utili 's Cost Estimate
Utili Pole s Relocation UP-1 Lum Sum
Street Light Poles w/Luminaires UP-2 $ 4,500.00 Each
WRITE-IN-ITEMS
Such as detentionlwater ualit vaults. �
Water Qualit Vault WI-1 $21,000.00 Each 1 21000
Sewer Improvements WI-2 $31,282.00 Each 1 31282
Water Im rovements WI-3 $30,292.00 Each 1 30292
Outfall ad WI-4 Each
WI-5 FT
WI-6
WI-7
WI-8
WI-9
wi-t o
SUBTOTAL 82,574.00
SUBTOTAL(SUM ALL PAGES): 112,528.75 61,717.00
30%CONTINGENCY 8 MOBILIZATION: 33,758.63 18,515.10
GRANDTOTAL: 146,287.38 80,232.10
COLUMN: B C D
Page 8 of 9
Unit prices updated: 03/02/2015
'KCC 27A authorizes only one bond reduction. Vet'SI011: 03/02/2015
worksheet 2.xlsx Report Date: 12/17/2015
Web date: 04/0312015
Site Improvement Bond Quantity Worksheet �
Original bond computations prepared by: -
Name: Darrell L. Offe, Jr. oate: 17-Dec-15
PE Registration Number: #27460 Tel.#: 425-260-3412
Firm Name: Offe Engineers, PLLC
Aaaress: 13932 SE 159th Place, Renton ,WA 98058 ProJect No:
FINANCIAL GUARANTEE REQUIREMENTS
PERFORMANCE BOND* MINIMUM BOND"AMOUNT PUBLIC ROAD&DRAINAGE
AMOUNT REQUIRED FOR RECORDING OR MAINTENANCE/DEFECT BOND"
� � TEMPORARY OCCUPANCY AT
Stabilization/Erosion Sediment Control (ESC) (A) $ ��,�.�`� - SUBSTANTIAL COMPLETION*""
Existing Right-of-Way Improvements (B) $ 146,287.4
Future Public Right of Way&Drainage Facilities (C) $ - I
Private Improvements (D) $ 80,232.1
Calculated�uantity Completed
�
Total Right-of Way and/or Site Restoration Bond'`/"" (A+B) $ ����5��.46�1.4 .1 �
(First$7,500 of bond*shall be cash.) � �1�2`t�
Performance Bond*Amount (A+B+C+D) = TOTAL (T) $Z���� .2�2G549'S T x 0.30 $ 1�7.�86rs.8
� Minimum is$2000. Minimum is$2000.
(B+�)x
Maintenance/Defect Bond*Total 0.25= $ 36,571.8 �
Minimum is$2000.
NAME OF PERSON PREPARING BOND*REDUCTION: Date: � Zd�
"NOTE: The word"bond"as used in this document means a financial guarantee acce le to King County.
*"NOTE: KCC 27A authorizes right of way and site restoration bonds to be combined when both are required.
The restoration requirement shall include the total cost for all TESC as a minimum,not a maximum. In addition, corrective work,both on-and off-site needs to be included.
Quantities shall reflect worse case scenarios not just minimum requirements. For example,if a salmonid stream may be damaged,some estimated costs for restoration
needs to be reflected in this amount. The 30%contingency and mobilization costs are computed in this quantity.
""'NOTE: Per KCC 27A,total bond amounts remaining after reduction shall not be less than 30%of the original amount(T)or as revised by major design changes.
REQUIRED BOND*AMOUNTS ARE SUBJECT TO REVIEW AND MODIFICATION BY KING COUNTY
Page 9 of 9 Unit prices updated: 03/02/2015
Check out the DDES Web site at www.kinpcountv._aov/permits Version: 03/02/2015
worksheet 2.xlsx Report Date: 12/17/2015
DRAFT PROPOSED COVENANTS
�
RECORDING REQUESTED BY AND
WHEN RECORDED MAIL TO:
CITY CLERK'S OFFICE
CITY OF RENTON
1055 SOUTH GRADY WAY
RENTON, WA 98057
DECLARATION OF COVENANT
FOR MAINTENANCE AND INSPECTION OF FLOW CONTROL BMPS
Grantor:
Grantee: City of Renton
Legal Description:
Additional Legal(s)on:
Assessor's Tax Parcel ID#:
IN CONSIDERATION of the approved City of Renton(check one of the following) ❑ residential
building permit, ❑ commercial building permit, 0 clearing and grading permit, ❑ subdivision permit, or
❑ short subdivision permit for Application File No. LUA/SWP relating to the
real property("Property")described above,the Grantor(s),the owner(s) in fee of that Property,hereby
. .
covenants(covenant)with City or Renton,a political subdivision of the state of Washington,that
he/she(they)will observe,consent to,and abide by the conditions and obligations set forth and described
in Paragraphs 1 through 8 below with regard to the Property. Grantor(s)hereby grants(grant),
covenants(covenant),and agrees(agree)as follows:
1. Grantor(s)or his/her(their)successors in interest and assigns("Owners")shall retain,uphold,
and protect the stormwater management devices,features,pathways, limits, and restrictions,known as
flow control best management practices("BMPs"), shown on the approved Flow Control BMP Site Plan
for the Property attached hereto and incorporated herein as Exhibit A.
2. The Owners shall at their own cost,operate, maintain, and keep in good repair,the Property's
BMPs as described in the approved Design and Maintenance Details for each BMP attached hereto and
incorporated herein as Exhibit B.
3. City or Renton shall provide at least 30 days written notice to the Owners that entry on the
Property is planned for the inspection of the BMPs. After the 30 days,the Owners shall allow the City of
Renton to enter for the sole purpose of inspecting the BMPs. In lieu of inspection by the City,the
Owners may elect to engage a licensed civil engineer registered in the state of Washington who has
expertise in drainage to inspect the BMPs and provide a written report describing their condition. If the
engineer option is chosen,the Owners shall provide written notice to the City of Renton within fifteen
days of receiving the City's notice of inspection. Within 30 days of giving this notice,the Owners,or the
engineer on behalf of the Owners,shall provide the engineer's report to the City of Renton. If the report
is not provided in a timely manner as specified above,the City of Renton may inspect the BMPs without
further notice.
4. If the City determines from its inspection,or from an engineer's report pmvided in accordance
with Paragraph 3,that maintenance,repair, restoration,and/or mitigarion work is required for the BMPs,
The City shall notify the Owners of the specific maintenance,repair,restoration,and/or mitigation work
(Work)required under RMC 4-6-030. The City shall also set a reasonable deadline for completing the
Work or providing an engineer's report that verifies completion of the Work. After the deadline has
. ,
passed,the Owners shall allow the City access to re-inspect the BMPs unless an engineer's report has
be�n provided verifying completion of the Work. If the work is not completed pmperly within the time
frame set by the City,the City may initiate an enforcement action. Failure to properly maintain the BMPs
is a violation of RMC 4-6-030 and may subject the Owners to enforcement under the RMC 1-3, including
fines and penalties.
5. Apart from perfornung routine landscape maintenance,the Owners aze hereby required to
obtain written appmval from the City or Renton before performing any alterations or modifications to the
BMPs.
6. Any notice or approval required to be given by one parly to the other under the provisions of
this Declaration of Covenant shall be effective upon personal delivery to the other party,or after three(3)
days from the date that the notice or approval is mailed with delivery confirmation to the current address
on record with each Party. T'he parties shall notify each other of any change to their addresses.
7. This Declaration of Covenant is intended to promote the efficient and effective management of
surface water drainage on the Property,and it shall inure to the benefit of a11 the citizens of the City of
Renton and its successors and assigns. T'his Declaration of Covenant shall run with the land and be
binding upon Grantor(s), and Grantor's(s'}successors in interest and assigns.
8. This Declaration of Covenant may be terminated by execution of a written agreement by the
Owners and the City of Renton that is recorded by King County in its real property records.
+ ' II
IN WITNESS WHEREOF,this Declaration of Covenant for the Maintenance and Inspection of
Flow Control BMPs is executed this day of ,20
GRANTOR, owner of the Property
GRANTOR,owner of the Property
STATE OF WASHINGTON )
COUNTY OF KING )ss.
On this day personally appeared before me: '
.to me known to be the individual(s)described in I
and who executed the within and foregoing instrument and acknowledged that they signed the same as
their free and voluntary act and deed, for the uses and purposes therein stated.
Given under my hand and official seal this day of , 20
Printed name
Notary Public in and for the State of Washington,
residing at
My appointment expires
i
�
�
I
,
,I
. •
r. . �-�� , �-� II'�
--�'s ;�1��.Il'��� i
RECORDING REQUESTED BY AND I
WHEN RECORDED MAIL TO: i
I
CITY CLERK'S OFFICE /n� i
w� � � V..
CITY OF RENTON �NI� �
1055 SOUTH GRADY WAY �
�i �
RENTON. WA 98057 �/ f
DECLARATION OF COVENANT
FOR IMPERVIOUS SURFACE LIMIT
r tor:
G an
Grantee: City of Renton
Legal Description:
Additional Legal(s)on: '
Assessor's Tax Parcel ID#:
IN CONSIDERATION of the approved City of Renton permit for
application file No. LUA/SWP relating to real property legally described
above, the undersigned as Grantor(s), declares(declare)that the above described property is hereby
t
. -
established as having a limit to the amount of impervious surface allowed on the property for the
pur}�ose of limiting stormwater flows and is subject to the following restrictions.
The Grantor(s)hereby covenants(covenant)and agrees(agree)as follows: no more than
� square feet of impervious surface coverage is allowed on the property. Impervious
surface means a hard surface area that either prevents or retards the entry of water into the soil mantle as
under natural conditions before development;or that causes water to run off the surface in greater
quantities or at an increased rate of flow from the flow present under natural conditions prior to
development. Common impervious surfaces include, but are not limited to,roof,walkways,patios,
driveways,parking lots,or storage areas, areas that are paved, graveled or made of packed or oiled
earthen materials, or other surfaces that similarly impede the natural infiltration of surface and storm
water. City of Renton or its municipal successors shall have a nonexclusive perpetual access easement on
the Property in order to ingress and egress over the Property for the sole purposes of inspecting and
monitoring the Property's impervious surface coverage.
T'his easement/restriction is binding upon the Grantor(s), its heirs, successors,and assigns unless
or until a new drainage or site plan is reviewed and approved by the Renton Development Services
Division or its successor.
• �
IN WITT�TESS WHEREOF,this Declaration of Covenant is executed this day of
,20
GRANTOR,owner of the Property i
li
GRANTOR,owner of the Property
STATE OF WASHINGTON )
COLJNT'Y OF KING )ss.
On this day personally appeared before me: !,
, to me known to be the individual(s)described in I
and who executed the within and foregoing instrument and acknowledged that they signed the same as
their free and voluntary act and deed, for the uses and purposes therein stated.
Given under my hand and official seal this day of , 20 �
Printed name
Notary Public in and for the State of Washington,
residing at I
My appointment expires
I '
.� t
Section 10: Operation and Maintenance Manual
The Operation and Maintenance of the proposed BMP's provided will be included within the Declaration of
Covenant from Section 9. These documents are provided within this section.