Press Alt + R to read the document text or Alt + P to download or print.
This document contains no pages.
HomeMy WebLinkAbout03160 - Technical Information Report s: r
; ��`�������..;:'�`��, ;
,:
;
; ' ,
���
;:
��..�3�� ����-��3 � .
R�?vTt��,"�����'�C�N
J1C� C�
°--; - � EIVE�D
`�N 2 3 2004
FILE NO. 74]-002-01 1
LABRADOR VENTURES, LLC PROJECT
PREPARED BY
TOUMA ENGINEERS
6632 SOUTH 191ST PLACE, SUITE E-102
KENT, WA. 98032
(425) 251-0665
January 15, 2004 '
��R w' �a
�'�'°� '� ,
V � .
, r �
�l� I �
+� �^ 947U � .r�t.'
�.,_ R ��. ,I
-}�: �����T�; �c�
„�edAt���� '
��(1'!i,1���i'7_'?I�5''�_..�.�J
3lCob
s r
King County Department of Development and.Environmental Services
TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
Part 1 PROJECT OWNER AND Part 2 PROJECT LOCATION AND
PROJECT ENGINEER DESCRIPTION
Project Owner Project Name
L��ru�lo r- U2/I�U/�!S' C/��/o.� �2�C Z-
Address �3/ �r� � � ��� Location
I�-�= z✓� �.�
Township
Phone Range 5 �
�ZS- �'0-3-D�OD .._-
Project Engineer ••••••-••••••Section �
ioir/ /o�incz.
Company o�m� L�S i�Pp�"�
Address/Phone �z1=zS�- o6L,�
Part 3 TYPE OF PERMIT part4 OTHER REVIEWS AND PERMlTS
APPLICATION
(i Subdivison DFW HPA Shoreline Management
Short Subdivision COE 404 Rockery
Grading DOE Dam Safety ✓Structural Vaults
Commercial FEMA Floodplain Other
Other COE Wetlands
Part 5 SITE COMMUNITY AND OF�AINAGE BASIN '
Community /le�,�y q�q/e,
Drainage Basin � ��,,,� W�S h,,��,��
Part 6 SITE GHARACTERISTICS �
River Floodplain
Wetlands !Jf'l//4/�'lP�
Stream U�-r�,����s�i''cQ�sf
Seeps/Springs
Critical Stream Reach
High Groundwater Table
Depressions/Swales
Groundwater Recharge
Lake Other
Steep Slopes `
t r
Part 7 SOILS
Soil Type Slopes Erosion Potential Erosive Velcoties
L19� .5�'�o /S� /rldder,��-c� Z s
Additional Sheets Attached
Part S DEVEL�PMENTtIMITATIONS
REFERENCE LIMITATION/SITE CONSTRAINT
Ch. 4—Downstream Analvsis �e�'-ed ,�c� �pcn�
Additional Sheets Attached
Pa�t 9 ESG REQUIREMENTS
MINIMUM ESC REQUIREMENTS MINIMUM ESC REG�UIREMENTS
DURING CONSTRUCTION AFTER CONSTRUCTION
c�Sedimentation Facilities ✓Stabilize Exposed Surface
✓Stabilized Construction Entrance ,/�iemove and Restore Temporary ESC Facilities
�j Perimeter Runoff Control �Clean and Remove All Silt and Debris
V Clearing and Graing Restrictions ✓Ensure Operation of Permanent Facilities
�Cover Practices ✓Flag Limits of SAO and open space
�Construction Sequence preservation areas
Other Other
• �
Part 10 SURFACE WATER SYSTEM
�/Grass Lined Tank Infiltration
Method of Analysis
Channel /9�.�C,S'�/�'1'� !
vVault Depression
t�Pipe System Ener Dissa ator Flow Dis ersal Compensation/Mitigati
9y P P on of Eliminated Site
Open Channel Wetland Waiver Storage
Dry Pond
Stream Regional
Wet Pond Detention
Brief Description of System Operation �ur�a��'D/�e G�e�J i�'/ c/3 �f?i,p�.1'o��''C�,+��/
�U I�QGI/` � ��U4.s,� /� {ov �ta�/77P�tT Osl�dP��,�c2No.✓ �Je�9�'P�
�. P.�Si�1f �y/i1��G�Bcc�As -�s�'�et�v
Facility Related Site Limitations
Reference Facility Limitation
Part 11 STRUCTURAL ANALYSIS Part 12 EASEMENTSlfRACTS
�Cast in Place Vault Drainage Easement
Retaining Walt Access Easement
Rockery>4' High ✓ Native Growth Protection Easement
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.
c=
��� ��,�,c, -- �-�-�-- �// O�
�
Signed/Date
TABLE OF CONTENTS
l. PROJECT OVERVIEW
IL CONDITIONS & REQUIRMENT SUSMMARI'
Ill. OFF-SITE ANALYSIS
IV. FLOW CONTROL AND WATER QUALITY
�'. CONVEYANCE SYSTEM ANALYSIS
V1. SPECIAL REPORT AND STUDIES - N/A
V11. BASIN AND OTHER COMMUNITY AREAS - N/A
V111. OTHER PERMITS- N/A
IX. EROS[ON/SEDMINTATIOIv CONTROL UESIGN
X. BOND QUANITIES WORKSHEET
XI. MAINTENANCE & OPERATION MANUAL- N/A
I
1. PROJECT OVERVIEW
The subject property involved in this plat covers an area of approximately 4.43 acres.
Approximately 3.84 acres will be involved in this analysis since the northern portion of
the site drains into the unnamed stream situated along north of the subject property. The
property is situated in the north end of the City. It is bounded on the south by the Plat of
Eldon Acres. It is bounded on the north by a creek situated 120 to 160 feet south of the
extension of N 28th Street. It is bounded on the west by Clover Creek Plat, recently
approved by the city of Renton. On the east the property is bounded by single family
homes situated within an abandoned Pacific Railroad right of way. Access to the property
is made from either Burnett Avenue N to the west, and Blvd from N 26th Street to the
east. The main access to the property will be from Burnett Avenue N. and a secondary
access from N 26th Street.
The project area is hilly with slopes ranging from 5% to 15%, except for steeper slopes
exceeding 40% exist along a creek on the north edge of the proposed site.
A creek runs along the north edge of the site area. The steep area will be placed within a
Native Growth Protection Easement (NGPE)tract and this area will be protected by
covenants securing the integrity of the steep slope and hazardous area. The NGPE tract
(identified on the proposed preliminary plat as Tract "A"). The size of the tract is
calculated at 17, 187 square feet. The creek flows through a rather deep ravine, 20 ft. to
30 ft. deep.
The soil type of the site is Alderwood, glacial till. Existing groundcover consists mainly '',
of high grass and lawn associated with the existing two single family homes and scattered ',
trees along the north and west sides of the property.
The proposed plat will have 15 lots with lot sizes ranging from 7200 square feet to
21,600 square feet. Most of the proposed plat improvements were constructed in
conjunction with the Clover Creek Plat and recently accepted by the City of Renton. A
new cul-de-sac will be constructed along the easterly portion of the proposed plat to
provide access to new single family lots. The new improvements will be designed to City
of Renton Standards and requirements for streets, storm, sewer, water and streetlights.
..- . . i ._ ---- .
: fl:.:. .:�:
_ t •. N!/II�l
_ --- - - - -----�_-��. _ .._.,.. �. _;w;,`:_ �_ -- -- — — — --
` .�-- __ �= . __.__.--- - _- ---�— -=='� -_`=-____ _ ` _.
, _.___._.. _---- _.__
_._ _�. _._..._ r-�: »��::;,�_=Nf;�_� ___ - � _
s.,:--.,._�w+az�-. — -. <r:
_ - ' � —_ �E';..� --
'" ' � . ,
' ��1--- v �' i i•.•y,� r�,.
�•,�„�`%-;'�-�=-i=3--.�,7��1_ ' l '�st'�a+. -_
`� L�y'+ - �\; ..�' ._ ,
�' . � .�.:'°�-.. �'' �. � '�.` � . .
� %'=�--- ,,,, ,j',�P7!: sc x_ :.,, T. -
, .
_,,, .
� '".� �._ '� p�+..Q �� ."��.. . . .
.._ . . __.-. � � � � � � � ^�) -
....-. _....r.._..�. \ }'\ �i�c,y . � T .
._ '�- A� a. ..
. .'.:.: � �.�}�_� � .�� i'�r .` .
'_' _' _ ......._.. Y� _ �� '�1 �� _ . ,�.._.
_ ._ ..., -' �/. ,�� j�} '�:::'T'� - - \ f' _.�, � �
. -�...�.', ... �,- �, lr ' � _ � � _ ` ;�� ... , x
.. �y ���J r . _ �. v l �� _ • , -
t' r. �, zro
_�- `\ ` _4.a-•''":'!"-•--Z-., _ a�....�E-� _ - _- . -- �
_ -' .` �`' . _. . ' '��__ _ �` �.�X.ig.�,, ���'_ - l L'F �
L`-- 1. � r �,;;v. �-+.5� �t 7i7 ap�t��_�--r•� ` _ .._ ."
. ���. � .. _. I�8.079. rO.K. 1 � �.. -�. .. . =�-^�-. �r`�.- �,.r. � - �-
�� O.1B aCles �7.2?2. s4!t � i� ' �.. � _ J,
;x�� � --� tC.16 acres �-_ J• - �-�`, : �'�"
�- � � � !' t. � -�-}" � i..
t1 � _ l � �I
r,�� �ti � �. . [-,k �/ J �y ! + n,� sc.r.
. 'y�-� �;'o,qt�,. �-T'.�- -_ - - -- - �' ` -B.6dz ,a.ic -� �c. ec.�c G.3 ocres . � ..
.,
�`�� � :1� - ''~ __ � • �p.19 ocres i O.xE oci (_r a nwil�
; ' � --� I � �woats+��aoiv+r
-•—"�._ _ �_� - _ - _ - '\e�• � � J� �r� '1i�,r wir I ,�.
� �' �rv�a� � ' 'Y-,' --- � - -�
-. . . . � 1 i . • _ \ ^ �wr -
_ �� _. ._ , � .��— � - \ \ � \ ` _
� � Y �/ I � ` . � �M '
`' . ( � I 1 � � 's mz�z.ah. /y
� . . �d' �� � ' � 0.2J oms j . _. M
� . Z700. w.R. � I � �
._ _. _ -. - . . . ��. I ;p.lB oa.ea �, •
.. . 1Q1A' - . ..'�M : �- --� ''�` �0 f �, ! 'i. - � � _. �
�_:�T ��Ir.� ��, I, ;� � �'
� N II, � �
_ , � (� � �---'�'t"�..' �, � ��'�� a�.� .�.n; � �
�� '�'.�� o.�,,a.r ' '
' � �11 ':� �� ' ' 9 � �� 8 �'� �,� - -
_ � . , i� � , ,
� z�,s�o. sa.h. '�� �.�s.,� �
rl;ez � � G.4�peres M � ; I aN�..o�.rt. arr� \, ' w�oc�°°t�sw�ac�r
� � � — � � J �� �i L��..—� � -- — � ; --- . --
,�,�. ���, �- ,.� � _ , ,.�, .
. ��
7.E.76'E SQ:tt� 4 �� ( 1, � .
_ Dcres — — -� Ir- — ' ` �..._
i�
" ` �3 ' '12 ^ � ;� �
_ � ,'.7a.ean.
�:\�� 7.?QG. mR �� � �I C
0�6 acr� ' I
l -�\ _ __ _- ` � �` � � ; � � .
\ ' ' � � �
` . '' ' �
\ ``l1`�� J��• � ; .
� ry
`c --,\ � -
\ -'- -
A,� `- .-+, "',. �
��->` � ,�. � �;
� ^ ,�
� \ �`� � �
�
� �� — — — —
=�STORtAIOVED � .� " - - - - - -� — r � � �
/ � ��
�"�'D��:.,r,� apz �
. �
I �: N P , ----- \ ----- - �i�i _��
, y I 1� N ��,. o C�r 4 iY' �.... - _ �_._-.___1 . ��� J�T `s 82no[� `���� .Y��sC� .��. � .�,..
-. ____-_ SLL I)I�J 'N, _
_' S > t 1 ��-b � U I51 JAL y( :.
�
, ' 1 ,, �.�' '' ,,. � " _ ,,.�. -� �g; o, " i
e�in �� ev ' � (5��.�'?'S�'� � / � � o I!v e m ��. �-�. bzNu.-L
I �� lv 5E ,
I��,. � II5 i n�� r y A< ;��? ,� �r,Y y, A`�. �rsi � �
��4� � � ' � =T `l`` 3Y �� ��v
��.�t„ r• .r I B41H � � I
y � I ,8 y IS - o a~ � �i' � [� ��aoo AY S '�"1 B�UT AV SE � D
{� 7 �SiH �r �
ltIIII. I�i . InVI S � ii t .�F�j� � �� N "� - -' �
I I � � � I. � 9� �5� V�$oP'"L'-'} b�i�,lsNyou.: J " �'2 , � � �h - �� v�
�..� �r �i �'S � ' ,,.p � �9�5� �^ '_ � �...t�` B51 � ���. ^:�R_� m
'iE341r� �r � q 5 i� e' �� � � � ��/ r AY�s Y •� r
I�� nl111!_�i +' hY.•l _ ., S Q� .. ... . _ W 4�$ �i�g_'�9 _IYN�YF " �; —'
I I�� i51� N., �il� s-+ . . . - -- -�-� i�- . . _ 'r`�:o�?� �k�°v '�� '�} -�K SE
H � y
H;III I AVIT �_� - � �a , . q�,q � �f 'l^ ... '� ,� ���
I � 5 q��i�. �� f � � � 0
��I.�.�_�' '� � �Ey,� 4 . � ��R jR r 17�r O � � �
� 'N�"��' � ��� _S ,, �'F,� �� .,�r vz�o �v sE � ao
3lNltlti -e� - --- - ��� �� m`oo �� 3 _
-- �Q _----� �A �/1 ;�, w�ia.•' � 6`�
----- � ; r,,f_ m `;��' ,_ _
1 ' '=�M� �y' N�-,.-'N�y 96111�Y SF�
n 3pt5M7nIM m� ,n = .
� ```
J� ��� � Z� � '
�5y�, F
v
; ���t 1N�'��, ��
l(x;AN AV y��'� '� g _^'� ...._,,. A P I
�
� . . . . -, ..__ z ' .
' ( '- .\ P � _-TT _ $ M�
.��.__`� . . � . - h'�i __ __ �''._ y _: _'.� -�
PARK AV N ,� < �/���� �,^ �, �I � � � � � � � � � _
�� , � i
��wi.vwy= � ��r� , � �igpl�dM �� - - � - � AY� �..� �
� ' �
' • -- H ". ' ..-.-'"� - - T� ��
� . M �,
'� �m. . __.M -, .-a-.-.� '�0 .p. `I _. . -. � _-
.:,. � N...n+ y, _, 5 N n FRWY }� - ��� - . Yd NF�lDOY 'a w Y 'a N "� \�.
' ' � , pa.C,n�'�'"-' - --6- —— - -- ..
. .
, ���b1_-•-%�' __..__ JUIIkS. .. ..... . H�� AY E 1� `al��� ll-: ... _._. . `t¢
.. ..' "__��'_- s ~`� `'
M S ... Y � - --L r 1d �i11N�� '"�.IDMFS A _-JONES V ,��` R(p(
z �"-
�. , 2 � � KENNE c�w[ m �N ��� -'� ` r -- _�' - - --��?��Y : -
� �n — .__.� -- � -__'. . _.. � --,1��g .--�. g ct.�
- SUN- - - - �wca� .�� ��`�. � r[a[r � �iv : � iiarx �v L C �I NE�N ti .., 8r Vn m
S(�'T �[ur ME �� V NF �k S � ty^ � .I Sf -� 1��
� .. � �u�i..r�R --_.8�. .... S2 1BEN�EEX fl we ^t ii
, _ .' a'N y__'__-...__" __..__�V_ � ME � � 112TX AV SE � �'b mv n ert� u �21� �Q'nVN �1 � �l i
;� i �' � '� m � E x �1NE� _�� .NE �tB R f f: r ns�� � � S SZ� _ ' _ . .. -. �.� . i �. A �.�i
�r, IN[ g H � V
���i�� �,� ` m � � .. .. MIAS��AY NE A �� �S '� f` . g ��V ' I 171 N YI
•��, _ s�d� I� � � s✓�, �- �� 'Q���v I � 8 f� �� 1 � �` i
o�,E �..tl m J'� � � wrr01 AY.Nk oM� ��v 6 NE� I'r� � � q�S�h � � 7 , 'r y:� �'�a; 5
s s°° ��oo EDMONDS ;n R AV��"'- -'�E ~ � � - �' � � : � 116111 'i �y�.n.,� A� m 7i, �, .t S �rn1
. . � �g �� ��F y � ■. A y; - - � : m y600 -' .,F,�� - -.- m � BG00_-. , .Nnao �. �� nr �r � - rmn �� "
�''1'tt� �-- � "'�"'�, �- d1-�-< NE �"� - - � r�wnuF�n w j�i`�� i�ii ^� � � � ; �'tii.
h � �Z
� ; , � r�,�}a„ A� -
� rurw�nc�ow'r�� "� � � r
� � ev s �� . � � ��� .�.
_ '____ ` g= +, �I� ���. � �l �rwir.ra;� � � ��$E � *�� � �^ �iR.�
� 1'� � IlBlll A ;
�� :�'� ��� .�.. ��6��:.°1�� �Y IXo[% I ���c�4� �vl i[�? � �'.`� 1.� ��- ���t.•. �T � V'F� ,�� I,
n,
��, ' i`, m �i . "11 p\yn I �� �111tIH�AIC f�� �,
w iJ�� \*�R :�\�* t. o JEfFERSqN � q �.i�irus � .•LS -1'� � o�170111 1-'1r � � .•rili�• �l
. 1. \ . �_._ . . , ,
u ♦ o�.` HF Y �..r�1«rtasa�vrt H � � ,��v 4�"m Y;.` � r I�� i.
1 .,\•K1RKtA�_ - '1� KINKLNI AYl P�,<4 . . _351d . � :• dt � s i ,�
, i
_ .. .�1.. . AV NE 4� �..��� � �'.� !�' 3�4p ... '�i �,�-�� 4 . �
a 8
� � (.., ilrra Sf ? 1 i�i�i �i r �
�o• lYNU1W0 AY ryE ��R � � � yi � i 2 S ;,'y t �e�.a �"�J � z�� ;Y; ��i•raNu Fu I� .is.
.
p - _..
1 r `
MUhWIE...! � AY NE s , i �� I 1\- Hi�L1 , �741� 1; 1�1 15U 1 �-�12:fx�� w :t ., ,
� i z �. . . . ._.._. A 1�� _ "� ,�S . . AY__ Sk �;,. - �h b u �` ,
-m r..l _ .� Y lICMROE __ ._ ._._...__.1_._ ...._._ . `3 y -�---_� - i5-TJ��� m i �[� ���
I�� � rtsoxrc��7i rs1��- _ �$ AV � . ��1jz� " �ILLYZI ' it � St� �
� ��OLIMP A AY ._ � �r NE m �� � 35 �v �Nl�� �s�l`i�� . . �� S�� � r�(� `7y+116M�i '� � �4.. r I i .
, `` �I 1�� �.•.
..`r _. � .. .• � %1.. . '2t� .. �: ` j
' o _ ,). r� I� K � �+� , �§ �s .v. � �� " 1 ,3 ; ,;�•�� i1 iii �V� i'FsF .,y .�� y�, f.�'' In+S M I �'
1 a �
�g . PI KY A1�61 �2 111'�� � � � 2�' l d� �9 1
� ��`�, � k°af�� r � �5 �� �s� , �8V^' �:' ;���
�N{!fN AY� .'� a� a� ._. _.. w" � .. �'"t ' � ` x v ,. � �i
w[una9... .Ax�-�r`Y� ��u� .� .S .• " -- Izn�M �r �x� �� x '� � r is J` n� Ni6t��,� ; .� � �.� �
,r_�. � ._ -� 7 I. � �.�y. � �z9rd.:s�, n�� �? '` � � ''3.�Y:� �� �, . � ��zvui ` ,�, ��st t �1;.4�,4-,:
� ;v��r�.m � ��c.a ly f. NDlif��5� �-�-- 3 � AY $E 4 � x N 1� ��� 1 t.��y - IA�M 1S __.
� ! r "�' INW. � YI[IIi.F�Y Yl m 8 II 51 AV i �ss .F 1�V HIUCI� '�
:L� � . �- - -- - � ,� ` '� :, �� o.� _
>
F '� � UNION^ � `��'`�� � T �� �g �1 s ' y ;,. ��,. �� i n, . �; U' F�; .
� � AY r NE '7. . 8.. 132WI].. . AV SE I -- �3 6�Et � 5 r�R�{���..� . -�� �,�7 .N 1 i�Mr p� � i
?� _� .. -.:�.�_.{ � � � rl.vu n IW00 � � ���ql y uNt�l 1s ' t�� �' � " � <
� a �+ �`g..�..1��c K �v u ni1 �+r �'j iJ �. �e �, �u�u NI HL�.
�ur�.r t ��3 Y�S� uxirci ill� 1 1� Y,�� t f c � ^ � � !/1 ���«
� �M11IiWW � � WV j I , c� 'r
Z \ /,y M[ I 4 AM� /'�' 1 ln 1V .
- �MIIMW c�` ;I��1;�:. , �,
I +wri s �F CT �� �� r ����� 1����P''� o( �A'Y Nk �l.y'u . .+:,;4'+ `, i��1�'N..�.{�,� ,. A I�• �V U', .
Bxu[x1a cr - 9f 111`)- I.�� . � � S
� -"ti-- µ.cac; r�c ;i..f� . --� 7� � � )AL�CREEK KWY hv �o � ' l r � .
'--13Sni Rv pE � �1 BR MFRION Y.H4,��y -�m-�-�� � S f', ����. � fis „ �n„i ���,��� •.` .;
l�&TH; AY AZ^ 9 i;�� � �� 'a� �g-� . i � .� � f�I < ���.�a �., ,
mSE ti �I� � i iseiii Au �d ��� � i
lu � �;�o � V � fDUVALI � �� �� � � � �.. -� � = �. ��IIII •
� ''
� � . �v� 138TH ' �AY �S . . � �i ( ,�'' � i � ti�
� ^ I lqom a� I ��. � __ AIV�N �n L ., �� � J� �;
�' ta �EIO AY Yf ` ._ I$ W�� nS? ' y � y�
� ^ � L]�� �Y�� 3 `� p/ !�Y" F� � Z Z c � �. � ;i
� in2r+u��� ' j �y � `s4 ���i�� � m . �, � �"" s� °p c.� ' �' /.c.
� �p ^=�, .� � �w ,. � �� � �;
.t wuue 1 145fU1 AY .
' � n'i
I Y'�.I� .p .-(. -L
. , n � '7 y � ,.�, S� d'r"
i�
pi '�i' 1...�_�[ a ,c SC � ..1... ,�
' 4'A( `�' �' � �•'
ol i �'j� -- ��- .. �._ ar xt ti � _�,, I� �I,...;`..>�I insi,r,� { 'c
i.iaui � - �� � s�..?.;<.��, �,i �1 I
I � �r si i c; I„ � ��i�v� � � �,� � � i ' 4 �° !/
�1 �� iuiu av v � i. , s ti C�
I � '��' - �� I, � �a � 4 ��� I��.
. ,� y���� �� � i� . I �ti I � ��.��' (S
I , I� ,� , � ! ' I I �, �'� �
M �i • � � !� '.•G � � ' �\ .,,,. :
May e � K�,C�Y� _ •EvC yA '��� I�I
j EwC .�> 8M `� �.� $ �
�M�'�1 La Orid�e&d:', �109 . i i� `�.. } . �� / OvD � • .\,': I
�6 r --- — — �_..��::: �� —�-,,.,,_-- L,;, ' 3 �$'O ��", I
. 1. � . . . y ; ;�L: 8�j_ , ���.q8p�l�-`'' _��" —��— l�j }�` � ` �'I
�� � '�� �,. � ' ' .o f Q•. �_ ,. � - m i '�
3 I a. , No � � � ASC .� I �. =BMQ. � � I �
KpO . ..R , t � ♦ u• ti �, , ,• �O • ` 605 ; �
.c= �.:��.� �. . , � .a .•r . {, � ' ' , ; I
•:, eP
KPg ; � � 7�4 .� •� ' �
'3 ' . . o ' � , �. Sm , �
. ('�
, �
. �
' r =• . ` � . ..� ` �• ' ;.
ir . � q C -A' .'�� � • _ .t �' ` �. . . �AgC �`•� ,�
�O�r1t �,� � r"�,�f ; --g-- a — � ..} � r I
+F��''�/Y '.�r�'�. � i ' 'i ti�� . . •• •AtD • `� t��' �P � r �
* �Aj�,� b + -t , ,T� �,�' .. .. f' . 1 �� .
,.t�y p.:.! 1 •.' . • . ,I B , . .•�•• '••• •
� 1� A' s''y�'�� .�;:,.- ;.' .# ._�Kennydale � . .-i a c,• �Y. y.. /:.. ,,, '� �,� �.P ;. ��� �;:
� � .;�:, ' St. ..InC AkF . �_ I •�•r . '• �, . � ' � . �
: ' � , • • • � �AkF � Ev6 _s' � AkF a.
� }';. ' . t•. j' ••r:i�•' . �.: '�� I , � _ � 'L
' �, �,;; Coleman Poin Q. PY � ; GR�AT£L .�,,
„ } �. �• , �AkF. � �t� _
! ?iy`- x� ` : �InA� � `�� ' i� s �•h�.. �
. ; ��. -�— }—— -- •t—:. r+l�- — -� r�� ,-++'�;!�--' +4
�l ' S ��` 1�r+��,,, g C �. / Z � • re .e„► ' ���eM�11 319 � ± . �•�^.;
` r ,,~�1�3+ m i ` '.r •,�bl r• a n.
�. i`. z;�� :� + z '�,� . {� ��� „ e. O .
o M t � ..x�� . �+ T I �'';, Eyre/11 Jl `� �u _E�_ —
. .. ;�, -- . �/7� . r N „ �'` � �U-
,
�O 7c..�- I`II I • . ��.� � y \ 1, i
�4 a }� ` � ll �a` , `�t';' ,�'S` �n AkF �!� � 't � �... : ..
�7 {,: �J 6 � 1 ��� ��I �• �1 r ,..
k �,' . � �� t � � < , � ,_ - , ^ C t.�
"� � +:� ' '� , a , :. `+• - �` t: �� ( ,AmC
�� ��tu, 2� � ; � � �'�gg,� s' �• 'pt •�_y$N"u„a -- �.s� ,� � _
� ,� � ..! d .�� �ot '+ �y .: h��.�--; : fT1B ;i II II ••. ff' — '� _ ; �. 1� i .�
. .� �p �� ILJL_
p�-:,� F� .� �� :1' 4 i'•7r��:��. �����Y�` 3 �� r�,' �_ 4� ' •� �I ��' '� � : •
a • � �a �� • i' i
+�.';t,���; '�rt.,� �,^, � ��, ,"O .,2�{y ' 'yr', �+ �` SR� y' ^ r • —
as�,f� D f . .j' 1") a '�� . 'y� �. �:t ��t't� � �� M �; � {d {�.
�f,���, e��, �f.,�� ��� - � �F s,�'� ( � .�; - ���� .� �! ,,�a� `'i� ' •ri r+' •'
167 T "„�,� ;r�"�t� � `� ~!f�� d {' �j�' � �� ��i �L !•a,l• '��,� '�� ��� • � � „b s� t�ti
D� ' .,>i� ,� '� yXa�'7��4 «5 ,�. ,�f' � _ �: .� �
�`;, J> MaW��� ., y��5y,�,��,y'�. ,� : 1F` �(i }'f��.�`s... �F } ' �.♦ �Y Ur I J�i i� �y•"j� �t ' � n��
\\ �1:i G_v 1- �� :,}� ..�r tyf��f ��� .'� ��.' .r;? ': �' : � 1..
���%)�• ''L;L �'�.+�'�� ' P'�t !��``k?�y�+ Ur •a �����-� � ��i �' ' , ,•L .� �y , � •� t
t^�. �.�,��� '� �' ''P BUY �'► 1 .,� � ��1 ' ��i•.� � '�� i.� 1Z ry If� �.• •d
�-- �nr � �Y'��� ��.. ' _ _ �k,_ .' ._ 1.. • � �.•y/ �• . •�
�x 'E d �, ��-� • '� �•1Z . , � • ` �
�f�' ��� t#k3 �u�7%; �h i' Plani ��' � y �•� ��.�', i �/ � M, � Ev
¢ ur �' R TO � �^ � ; '�, ,y � �.' J ',
' ♦ � :Rd� •y�0•GS i „ ♦• { —�'•�
. 4 E. R.S E. RENTON l.9 Ml. / // ' t f
12 30 (Joins sheet 1 1) RdC 10'
R£NTON l.7 MI.
Scale 1:24 000
j/4 � i.� 0
--- — � � 2 M�les
�
i000 40nn 3000 2000 ]000 0 -- 5000 ---�----�— 100v0Feet
I hi5 map is one of a set o(2p.
/�
I��"IF1�, � � :iilll � ;���f�%:, ,,;'.�,Illrl� ��1 �'�'�1 rl��. �
PRELIMINARY CONDITIONS SUMMARY
CORE REQUIREMENT #l: DISCHARGE AT NATURAL LOCATION
The allowable outflow from the site will be discharged to its natural location. The level I
flow control will be calculated to match the developed peak discharge rate to existing
conditions peak discharge for the 2-year and 10-year.
CORE REQUIREMENTS #2: OFF-SITE ANALYSIS
Refer to off-site analysis on subsequent pages.
CORE REQUTREMENTS #3: RUNOFF CONTROL
Refer to Advisory Notes attached to City's Determination of Non-Significant statement
dated August 14, 2001. The detention facility is provided for this plat was provided
recently in the development o over Creek One. There are no additional requirements.
CORE REQUIREMENTS #4: CONVEYANCE SYSTEM
The conveyance system is minimal for this development since most of the underground
storm systems had been installed during the development of Phase One of Clover Creek
subdivision. Storm runoff from the new homes and added cul-de-sac will be directed into
the existing storm system in Park Avenue N.
CORE REQUIREMENTS #5: EROSION/SEDIMENTATION CONTROL PLAN
The Erosion/Sedimentation control facilities will consist of filter fabric fences to be
placed along the top banks of the creek along the north side of the site. The steep areas
will remain undisturbed. The existing wet vault desi ned for ea for Clover Creek
Plat will be utilized for water qua�ty control.
CORE REQUIREMENT #6— MAINTENANCE AND OPERATiON
N/A
CORE REQUIREMENT #7 — FINANCIAL QUARANTEF.S AND LIABILITY
N/A
CORE REQUIREMEN'1' #8— WATER QUALITY
Water quality facility is ��vi�d fort his site under_C_lover Creek One development.
There are no additional requirements. ^
SPECIAL REQUIREMENTS—THOSE APLLICABLE TO TAIS PROJECT
1. Critical Drainage Area - The drainage basin is not part of any critical drainage
area.
2. Compliance with existing Master Drainage Plan—N/A
3. Conditions Requiring Master Drainage Plan—N/A
4. Adopted Basin or Community Plans—N/A,
However, the site is located in the Cedar River Basin and the Green River
Community Planning area Refer to attached Figures 1 & 2, of King Co. SWDM.
5. Special Water Quality Controls— There will be no appreciable new road added to
side except for a new cul-de-sac. The water quality facilities constructed for
Clover Creek Plat will be adequate to provide water quality control.
6. Coalescing Plate Oil-Water Separators—N/A
7. Closed Depression—N/A
8. Use of Lakes, Wetlands, or Depressions for Detention — N/A
The existing wetland situated northwest of the site area was delineated when these
four lots were created by the Plat of Clover Creek. The proposed development is
outside the wetland and its buffer areas.
9. Delineation of 100-year Flood Plain—N/A
10. Flood Protection for Type 1 and 2 Stream —N/A
1 1. Geotechnical Analysis and Report —N/A. soil studies were provided in Clover
Creek One.
12. Soil Analysis and Report —N/A.
13. A Wetland Mitigation Report —Wetland study was prepared in conjunction witt�
the Clover Creek Piat which created the large four lots which equate to the
proposed site.
� �
lll. OFF-SITE ANALYSIS
1 UPSTREAM I
The site is situated at upper end of its own basin, approximately 4 acres. The flow is
directed south for majority of the site except for the steep creek bank. The sheet flow
across the site is directed to a recently built roadway and storm drainage facilities and
conveys the runoffto a detention vault situated at the southwest corner of the proposed
site.
2. DOWNSTREAM
The flow from the detention vault restricts the out-fall and discharges the runoff into an
open ditch along the north side of N 26�' Street. Eventually the flow is directed to an
existing creek mentioned above. Thence the flow is directed into a culvert under Lake
Washington Blvd.; thence into an open drainage swale until it reaches under culvert
under the railroad. From this point the flow is directed into a drainage swale which
directs the flow into Lake Washington approximately 150 feet. Refer to attached analysis
which addresses the off-site flows and downstream analysis.
OFF-SITE ANALYSIS DRAINAGE SYSTEM TABLE
SurFace Water Design Manual� Core Requirement#2
Basin: ��5%Ci�/<E t�i��'Sr//ti�� Toi✓ Subbasin Name: GtijLiQ��L; ��%ic'.�:rrN Subbasin Number: �
Symbol ' Drainage Drainage Component Slope Distance Existing Potential Observations of field inspector II
Component Type, Description ' from site Problems Problems resource reviewer, or resident ,
Name, and Size dischar e
Type:sheet f{ow,swale, constnctions,under capacity,ponding,
see map stream,channel,pipe, drainage basin,vegetation,cover, 96 1/4 mi=1,320 ft overtopping,flooding,habitat w organism tributary area,likelihood ai probtem,
pond;Size:diameter, depth,type of sensative area,volume destruction,scounng,bank sloughing, overflow pathways,poterttial impacts.
surtace area - sedimerrtation,irtcision,other erosion I
/�'Eh%<I.G�✓[: CL'L✓C2T i � i
(l) �6'�,�C�' hr���,��.�i�L, �C���E 6EL 3,� �— �� ,/l,�c�v`� C�'���C��;- Dk����.�c� oF j��v�
?...FT. ►�i�[�,c � i G 4 F�D F L�, PEc�BLE � � G i�i�.!�1 C i i r C I-!E C/:,E'J
C2 � Lvr� ,a�� ��►�-aER�y C-�ass /0 c�7/�s Nc ti�E �✓✓�,�E - ,� c
��� 2� ��R'C✓� F���ti.H�`��,� 5.6 /98=/�'7 /�'o�;'� C.�'rvi�c� ij C/�`'f-}C/T� Ch'GC/�Eu
��� ST��AM �� ��kt l✓i4SHiN�T• D/�1.4 LP7�33y �;,ic,�E NoN_ �i� E'k'as,o�v
, ,
— L✓yk� �U�� D .357-- / ��f
L1Table.doc 11/2/92
�
�� .
, _ \ � ` 1 \ .�4
i � . - \ . �y �`<a �, .
EX SSMH k�--``4� ���
� x� ��
R1M=55.71 • � ��1 �� +��"\<� �
�_
� � �� �,� � �
� / �� _ '...� -::Y
/�' x�T. y
I
�y � ". s'� \. -I/ ���\ �'��-';�.o�``�,� ,�;� ,r�
, �� � ��� �\ �'t•.� �`t '
i; �`�
, O -,, ` , ;.,� .�C 42.g3
w : >� .. �,:� ?r2.76
� � // \� x 3J6 'c� '• �v ;,�� 4+,, .
� � � �\� .�`�.���. � .
�� . \ � �\ �'ti� -. . .�"` ,
I . \ •�.63.40 l ��\� w�`��x•�- , ' ,.,�
; � � .•siie � �
\� - • i.`
�' , \ Q �\ C' � ��1� x:1.OF , � .. r;
� ` , ,
. �!\�.85 ��'•-`i
� � � �
i . ".. \ / �� '�,�'
� . � \�
I te . �t.es \\x: �
� � •. 31.� �\ 4
i 8.et C2� �.. � � �\
�3) � . ,
j X .Be ' � yc.5i.s5 � '
� . �5�.:::i.'.. �\
. � . . .-� �'. \�
� 8� . -. . � - � \ \�
I .14 �
; 24" CONC 36" CONC . � � \ � '
!E=26.DO lE=29.80 . \ i
�s
, 1 � i
� ` �, � � � s, i
� \ �� � •.
, C�� � �
� , � :�,:�
� � ��.�
.� ,
� � .
, , ,
, _ -� ,
� ,
' , , FccT r�R�asE
� j ,.
� v�
IV. FLOW CONTROL AND WATER QUALITY
N/A
V. CONVEYANCE SYSTEM ANALYSIS
The proposed storm system consists of three runs of 12-inch culverts connecting
the proposed storm system for the cul-de-sac to an existing storm system in Park
Avenue North, approximately 1801ineal feet. The minimum slope is 1.0 percent.
The 100-year developed runoff from the site is calculated at 2.42 cfs
The attached calculation determined that a 12-inch pipe at 1.0 percent has the
capacity of 3.86 cfs, more than anticipated 100-year flow during post
development.
Circular Channel Analysis & Design
Solved with Manning' s Equation
Open Channel - Uniform flow
Worksheet Name : Clover Creek 2
Comment : Determine Pipe Capacity
Solve For Full Flow Capacity
Given Input Data :
Diameter. . . . . . . . . . 1 . 00 ft
Slope . . . . . . . . . . . . . 0 . 0100 ft/ft
Manning' s n. . . . . . . 0 . 012
Discharge . . . . . . . . . 3 . 86 cfs
Computed Results :
Full Flow Capacity. . . . . 3 . 86 cfs
Full Flow Depth. . . . . . . . 1 . 00 ft
Velocity. . . . . . . . . . 4 . 91 fps
Flow Area . . . . . . . . . 0 . 79 sf
Critical Depth. . . . 0 . 84 ft
Critical Slope . . . . 0 . 0097 ft/ft
Percent Full . . . . . . 100 . 00 0
Full Capacity. . . . . 3 . 86 cfs
QMAX @. 94D. . . . . . . . 4 . 15 cfs
Froude Number. . . . . FULL
Open Channel Flow Module, Version 3 . 4 (c) 1991
Haestad Methods , Inc . * 37 Brookside Rd * Waterbury, Ct 06708
STORM DRAINAGE REPORT
FOR
Clover Creek Division 2
BASIN AREA 3.84 ACRES-ON SITE AND OFF SITE
SOIL TYPE Acd -Alderwood
Type "C"
TIME OF CONCENTRATION - PRE-DEVELOPMENT- FOR 2-YERR, 24-HOUR STORM DESIGN
SHEET FLOW- OFFSITE
MANNING-n 0.15
OVERLAND-L 300 FEET
PRECIPITATION-P 2 INCH
SLOPE - S 0.055 FT/FT
T1 = 19.91 MINUTES
CONCENTRATED FLOW- OFFSITE
OVERLAND L 420 FEET
K- VALUE 21
SLOPE - S 0.07 FT/FT
VELOCITY-V 5.56 FPS
T2 = 1.26 MINUTES
TOTAL TIME -PRE- DEVELOPMENT 21.17
TIME OF CONCENTRATION - POST DEVELOPMENT- FOR 2-YEAR, 24-HOUR STORM DESIGN
SHEET FLOW- OFFSITE
MANNING-n 0.15
OVERLAND-L 200 FEET
PRECIPITATION-P 2 INCH
SLOPE - S 0.055 FT/FT
T1 = 14.40 MINUTES
SHEET FLOW- ONFSITE- ASPHALT
MANNING-n 0.011
OVERLAND-L 100 FEET
PRECIPITATION-P 2 INCH
SLOPE- S 0.15 FT/FT
T2 = 0.68 MINUTES
CONCENTRATED FLOW- ONSITE UNDERGROUND PIPE
OVERLAND L 270 FEET
K- VALUE 21
SLOPE- S 0.007 FT/FT
VELOCITY-V 1.76 FPS
T3 = 2.56 MINUTES
CONCENTRATED FLOW - ONSITE UNDERGROUND PIPE
OVERLAND L 270 FEET
K- VALUE 21
SLOPE- S 0.007 FT/FT
VELOCITY-V 1.76 FPS
T4 = 2.56 MINUTES
TOTAL TIME - POST DEVELOPMENT 20.20
, 24, 3 . 9'
------ -- - ----- ------- --------- - ------------------ ---- ---- ---- ---- -----
******************** S .C. S . TYPE-lA DISTRIBLTTION ********************
********* 100-YEAR 24-HOUR STORM **** 3 . 90" TOTAL PRECIP . *********
- --- - - - ------ ------- ----------------- ---------- ----- ----- --- ---- ---- - -
ENTER: A(PERV) , CN (PERV) , A(IMPERV) , CN(IMPERV) , TC FOR BASIN NO . 1
3 .41, 86 , 0 .45 , 98, 21 . 17
DATA PRINT-OUT:
AREA(ACRES) PERVIOUS IMPERVIOUS TC (MINUTES)
A CN A CN
3 . 9 3 .4 86 . 0 . 4 98 . 0 21 . 2
PEAK-Q (CFS) T-PEAK (HRS) VOL (CU-FT)
2 . 09 7 . 83 36226
ENTER [d: ] [path] filename [ . ext] FOR STORAGE OF COMPUTED HYDROGRAPH:
a : l00yrex
SPECIFY: C - CONTINUE, N - NEWSTORM, P - PRINT, S - STOP
c
- - ------ - ----- - - - ---- ------------------ ---- ------------ --- ---- ----- ---
ENTER: A(PERV) , CN(PERV) , A(IMPERV) , CN(IMPERV) , TC FOR BASIN NO. 2
2 . 69, 86, 1 . 31, 98 , 20 . 20
DATA PRINT-OUT:
AREA(ACRES) PERVIOUS IMPERVIOUS TC (MINUTES)
A CN A CN '
4 . 0 2 . 7 86 . 0 1 . 3 98 . 0 20 . 2
PEAK-Q (CFS) T-PEAK (HRS) VOL (CU-FT)
2 . 42 7 . 83 41255
ENTER [d: ] [path] f i 1 ename [ . ext] FOR STORAGE OF COMPUTED HYDROGRAPH:
a : l00yrd
SPECIFY: C - CONTINUE, N - NEWSTORM, P - PRINT, S - STOP
� KIN'C COUN 'PY, W ASIIINC� TON, SURFACE WATER UESICN MANUAL
— — --- —-- _ __ _— ------- — —--------- — —— _ ----——
FIGURE 3.S.lti 100—YEAR 24-IiOUR ISOPLUVIALS
3v _ _ L: .� ��,, q >,�t tuw� =r' — ;�, — ,.
] ;
`3y ., �� ,� ,. t - _ ' , r -
2 � -- �-�� ' �'
�3 � � ��
4 ;� �- �V. � ', � _ ✓� � ��
36 ; � f �,, �: _ �' �� �. ��
3 3� 3��_ �`i _ ,� . �� � - ,1
J � r� ..
9 • -. .
. . �. �,
• -- - .
:
� ,
,�
4� � ,' "_ � -- '�.,,- - `, ��_' - t
q _ ---� '� _ . _ � - -�_ � / -
� �r,��•�_ 1 V+�� - - � � �
43 ; -. _ , _� - -- _ �,�'�� ,
:,, _ � o
.
� 44 , �.,. , "�e _.. ;� = u v •' ` r".. (` a �
i g �,;�
�,� � i n�
, � - � , ' ;
4s iv ~< �"'� --
� - - _ _ � � ) �
,' �� 1/ l 1 �� i
_ � �V� � ` . ��r
�6 �. _ ,�. • � '_ _ _„�� � � �
` � � _ \ � �
�� ��� � �� � � � {
� , - � -
I��r� ° �--.�-- .��` I ' _ ' ` �� ��
� I � 4_ 1 y � �n . ,_.
� I — . . . 1.� � ,� ,._ (i�w.� —
l 1 � �'
i �"" .� � - )
� ' _ ��� _ '�,' '� � ` �' ( �'.
I ^� -/ �, ;I : J �"a, � � � 6 'Y+. -i
� � ' �� OM i �� 1 � .?,. � �� �� �
� �� ��� � ..�1.� .. �� - � ._ _ � � 'i.
�� 1 � - n
,I � / `� � ,,,, � � /1„ � .�y
_� ` , ;� 1 -=`� � ,t S� .e i', ./,- , i . � k .,
'� '�•' � ��. � -- � �,� 1
I yl I I_ � J � d,_ �� �� � -
, �_., J � i
� „ ! '0 � <�.- ` � � _
� � ��., � " � �� 1� . � �� `�.: � � �/s
__ �� � �. � ._, `i n
`yt .; Y j: ���` "' _ —.�1 i � �' �
.;�� - ,�� �-;r � � � ,� j �� .,. � ��.� ,
_�=1 ;�; '� ...� �� ` �, ._p � `�O�
� � . f q'� �� 1 � '
- -�Q _ �� - �� �` , - - - ' ,. iG�
100-YEAR 24-HOUR PRECIPITATION � , _� , � 6.5
a4 ,� -- f _ . �.�
i 3.4-^--ISOPLUVIALS OF 100-YEAR 24HOUR a. �y i_ - - �,� � � ,P_ ,:�
TOTAL PRECIPITATION IN INCHES - ' '`"' �` - �`` s'S
�' �fL �� = `l\ 1.4
� � a• � - y �_ , �
O 1 2 3 4 5 ti / B Mlles � „('•�,, �
— — - �.�..;.- -.� ,� � �
— �3.s.�-►3 a� yo �,�,. �
,: 3oo,oao ��,�c►
� ' �
KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL
TABLE 3.S.2C "n" AND "k" VALUES USED IN TIME CALCULATIONS FOR HYDROGRAPHS
'n,-Shcel Flow Equatlon Manning's Valuea(for Ihe Inillal 300 fl d Iraval) n�•
Smoolh suAaces(concrele,asphall,pravel,or bera hard packed son 0.01�
Fellow(ields a loose soM surlace�ra residue) 0.05
CuMHaled soM wtlh resldue cover(e�-0.20 R/11) 0.06
CuhNated soR wilh resklue cover(S>020 N/ft) 0.17
Shon prairie grass and lawns 0.15
Dense grasses 0.2t
Bermuda grass 0.11
Ranpe(natural) 0./5
Woods or forest wkh Iight underbrush 0.10
Woods a Iwest w�h dense underbrush O.BO
•Man�i�g values for sheel flow aily,Irom Overtan and Meadows 1976(See TR-55, 1966)
'k'Values Used In Travel Time/Tlme d ConcerNratlon Calalalbns
Shallow ConceMrated Flow �ana��r,e r,���ao n.d sn«i no„�,R .0.1) k�
1. Faest wlth Aeavy grourd IMer a�d rt�eadowa(n-0.1o) 9
2. Brushy ground wNh some Ireee(n�0.060) S
3. Fallpw or minlmum IMlape cupNatlon(n -O WO) 8
4. Hiyh prass(n �0.0�5) 9 ,
5. Short qress,pasture and lavms(n.0.0.70) 1 t,
�, Neady bare prourW(n=0.025► 1�
7. Paved ard qravel areas(n-0.012) 27
I
Cl�annd Flow(Inlcrmlllenl)(A�ihe beghwihq d vislde chanoels-R-0.2) q�
1. Fwesled swale w111�heavy praxd iNter(n = 0.10) 5
2 ForestoA Ar:+ii�ge course/ravine wlth delined cha�x�el bed(n�0.D50) 10
�. Rock llned watcrway(n=00.75) IS
4. Grassed walerway(n•0.090) t 7
S. Earth-Ilned waterway(n�0025) 20
6 CMP plpe(n�0.024) 21
7. Caicrete pipe(O.Ot2► 12
8 Othe�waterways and plpes , 0.508/n
Channel Flow(Contlnuous stream,R .0 4) k�
9. Meanderinp slream wllh some pools(n�0.040) 20
10. Rockained stream(n-0.035) 23
11. Grass-lined slream(n�0.030) 27
t2. Other streams,man-made chamels and plpe 0.607/n••
••See Chapier 5,iade 5.3.6C la eddNbnal Mannlnys'n'values lor open channels
3.5.2-7 1�
. i
� KING (' (111N "1' Y, WAti111N (; TON, SURFACE: WA '1' FR UEtiI (; N MANUAI,
_.._ ______.�----.------
- ---
_ _. - - --- -- - -- ----- - -- - I
- -- _
'1'AIlLF 3.5.2D SCS WFS'TERN WASf1INGTON RUNOF CURVF NUMBERS
_ . _ - - __------------------_ _ ------------- -------- I
SCS WESTERN WASHINGTON RUNOFF CURVE NUMBERS (Publlshecl by SCS In 1992)
Runoft curve numbers lor selected agrlcultural, suburban anci urban land use fo�Type tA
rah�tall dlslrfbidlon, 24-hour slorm duratlon. �
CURVE NUMBERS BY
FiYDROLOGIC SOIL GROUP �
LAND USE DESCRIPTION A B C D
Cultivated la�d(1): � wlnter condltlon 88 et 94 95
Mounteln open area�: low growing bruah and graaslanda 74 92 89 92 �
; Meadow or pesture: 65 78 85 89
� Wood or forest land: urxilsturbed A2 64 76 Bt '
Wood or torest land: you�g second growlh or brush 55 72 et 86
, Orchard: wlth cover crop 81 88 92 94
� - -----
- -- ------- ----
, Ope� spaces, lawns, parks, golf courses, cemelerfes.
lendscaping.
good condNion: grass cover on 7596
or more of the area 68 80 86 90
feir condltlon: grass cover on 50%
I to 7596 0l Ihe area 77 85 90 92
Grevel roads eixl parking lots 76 85 89 91
Dlrt roads end parking lots 72 82 87 89
Impervlous suifaces, pavement, roofs, etc. 98 98 98 96
. Open water bodies: lakes, wetlands, ponds, etc. 100 100 100 100
Single Family ResidenNal (2) — ------- --- ---------
Owelling Unk/Gross Acre 96 Impervious (3)
1.0 DU/GA 15 Separate curve number
1.5 DU/GA 20 stiall be selectecl
2.0 DU/GA 25 for pervious and
2.5 DU/GA 30 Impervious portion
3.0 DU/GA 34 0(the slte o� basln
3.5 DU/GA 38
4.0 DU/GA 42
4.5 DU/GA n6
5.0 DU/GA 48
5.5 DU/GA 50
6.0 DU/GA 52
6.5 DU/GA 54
7.0 DU/GA 56
Planned unR developrrients, % impervlous
condominlums, apartments, must be computed
commerclal business and
irxlustrlal areas.
(1) For a more detalled descrlptlon of agrlcultural land use curve numbers reler to Natlonal Engineering
Handbook, Sectlon 4, Hydrdogy, Chapter 9, August 1972.
(2) Assumes roof and driveway runoH Is directed inlo atreet/storm syste►n.
(3) The remaining pervfous areas (lawn) are considered to be In gooci condltion for these curve nin��t�ers
3.52-3 1/R'�
X1. EROSION & SEDIMENTATION CONTROL
The contractor shall install silt fences along the Park Avenue North east right of
way to intercept silt laden material resulting from the clearing and grading of the
cul-de-sac area. Likewise, at the lowest point of the site adjacent to the north right
of way of N 26'h Street.
Temporary construction entrance will be constructed using 8"-12" qu�rry spalls as
indicated on the temporary erosion sedimentation control plan.
Sediment 'I'rap (if required)
SA=FS*Q�/V,
SA - Sediment Trap Area
FS — Factor of Safety = 2.0
Qz- 2year flow in post-developed
VS=0.00096 ft/sec
SA = (2)*0.91/0.00096
= 1896 square feet required.
. � �
KING COUNTY, WASHINGTON, S URFACE W A7' ER DESIGN M ANUAL
FIGURF 3.S.1C 2-YEAR 24-tiOUR ISOPLUVIALS
` _�; �'� - tr-=P- -� - - i - -
, �-� i ���
. .y ,N �, �..t.—
� I \ '��. � e, �� ?% �j� v`� - ` �
r.�' t _�. � �;�� � �l -- ��
r�, _ �_ ';, � - _ �s, - � � ,
' _ .�) �'� �' +4,- _` � _ � �L �`-,�
� � - , :�� I /,-Mrq.d �,.� � �
x� - � - �."� _ � . ; ' �'
• .,
. �
y� ;`'� --:, � �— ` _ , _ _� � ' �,—
__ _,= ° . ;'��o`_ � �
2:Q �- _ �; � �'�C - - � >G � - o�
! � :��' � - �) -- ��' � n'e+Q
� ' �f —^� -- - . ` _
� e ,� �` �
�I r c'� i ;�
� �� � � �
L�t� � � ._.
� ;� 1���� � ,.
/ �
� - � '' } ! /
-- � (� ��, � � - ��f � xd
� •-. � �— - �� � _ .� �� �`�'
��
,� � �
�
�N f
� i .i. i �
r �`-
� `- �� � �'
� � ` f
� i` �.� � �.,( )
�� ��}�.�.. .w�- � � - �I �� �
Ir �� �_" � ! � • � � 't � I
��'V rs' �{�-...
I �. -` 1 ..,.. \ � , � _ t� — � - �,1 ,r .—
', � ,�,�;i r . �; t �_
' j ( �� y�-�� _ 4�s ,-
� j"— � � ��' i �`�r.___ �
�` J (�O'� ��.
� 1 t /^ ` _' .__ . _ DM � _� � ` • -:��..' � ••�
i � �" � �,LA�� � � �� �'�.� �
,� �!. _ i C� -1- � "' �4
_� / j 1 f.l ,:I�.- � . - � - ,_ ,� � / �-� i
i� � / , �,- . ' . - - -� �� -
�� - ���� � J —J � � � � �
�/�� � �•, � �5 � 1► __ � ,_ ��,_. t �:��
�/ � __ ``��, ��� ;, �-��, f ' l S� " ''"�' ''
N .� � °� -� -. ;r ``r -- �` ° -� � _ ''`
�, ( � ' J� �� 1 '� f �it 'r � �t
'� ��
�1i � , t "1 �r � �''a •
"� - ` �<. s� � ,,
N ' - _.
� t � �,��,
- -- � -, �� `�., � i
2-YEAR 24-HOUR PRECIPITATION t �_. ,
,.3.4�"' IS�PLUVIALS OF 2-YEAR 24-HOUR �► � --- - �
TOTAL PRECIPITATION IN INCHES � — 1 `" ' ' ' r s'� 3•
ry - �
- — -- — — - — - r — Y
. _ . �`•' �' .•,_ •- ., .
0 1 2 3_4 5 6 7 B Mll�s � -- �
N �#'���.�} � ,,�'
�1r ���� ,��; �-
�:300,000 1,-=� i�o
3.5.1-8
2 , • '
SBUH/SCS METHOD FOR COMPUTING RUNOFF HYDROGR.APH
STORM OPTIONS :
1 - S .C.S . TYPE-lA
2 - 7-DAY D£sSIGN STORM
3 - STORM DATA FILE
SPECIFY STORM OPTION:
1
S . C.S . TYPE-lA RAINFALL DISTRIBUTION
ENTER: FREQ (YEAR) , DURATION(HOUR) , PRECIP (INCHES)
2 , 24, 2 . 0
- --- - - - - - - - - - --------------------------------------- ------- - - --- ---- - -
******************** S .C. S . TYPE-lA DISTRIBUTION ********************
********* 2-YEAR 24-HOUR STORM **** 2 . 00" TOTAL PRECIP . *********
-- - - -- - - -- - --------- ------------ ---------- --------- ---------- -- -------
ENTER: A(PERV) , CN(PERV) , A(IMPERV) , CN(IMPERV) , TC FOR BASIN NO. 1
3 . 41, 86, 0 .45, 98, 21 . 17
DATA PRINT-OUT:
AREA(ACRES) PERVIOUS IMPERVIOUS TC (MINUTES)
A CN A CN
3 . 9 3 . 4 86 . 0 . 4 98 . 0 21 . 2
PEAK-Q (CFS) T-PEAK (HRS) VOL (CU-FT)
. 68 7 . 83 13363
ENTER [d : ] [path] filename [ .ext] FOR STORAGE OF COMPUTED HYDROGRAPH:
a: 2yrex
SPECIFY: C - CONTINUE, N - NEWSTORM, P - PRINT, S - STOP
c
- -- --- ------- - ----- ------ -- -------------------- - ------- - - - - - - - - - - - - - - -
ENTER: A(PERV) , CN(PERV) , A(IMPERV) , CN(IMPERV) , TC FOR BASIN NO . 2
2 . 69, 86 , 1 . 31, 98, 20 . 20
DATA PRINT-OUT:
AREA(ACRES) PERVIOUS IMPERVIOUS TC (MINUTES)
A CN A CN
4 . 0 2 . 7 86 . 0 1 . 3 98 . 0 20 . 2
PEAK-Q (CFS) T-PEAK(HRS) VOL (CU-FT)
. 91 7 . 83 16656
ENTER [d : ] [path] filename [ . ext] FOR STORAGE OF COMPUTED HYDROGRAPH :
a: 2yrd
SPECIFY: C - CONTINUE, N - NEWSTORM, P - PRINT, S - STOP
s • �
X BOND QUANTIIES WORK SHEET
� �' f
Page 1
SITE IMPROVEMENTS COSTS
OATE 19-Jan-03 PROJECT NO. - 741-002-031
PROJECT NAME Clover Creek 2
SITE ADDRESS Park Ave NE & NE 27th Ct
ii'EP^. UNIT PRICE UNIT QUA!':`i'I`l'i E'kICE
S I TE IMPROVI�NTS
CLEAR & STRIP SITE S2,000.00 AC 3.19 56,380.00
EXCAVATION S8.00 CY 10590 384,720.00
FILL S12.00 SY 100 S1,200.00
ASPHALT PAVEMENT 59.00 SY 736 S6,624.00
CRUSHED SURFACING 57.00 SY 736 55,152.00
CURB, GUTTERS & CW $15.00 LF 760 511,400.00
ROCK WALL S15.00 LF 190 S2,850.00
SUBTOTAL S 118,326.00
STORM DRAINAGE
12" PIPE- RPVC 535.00 LF 182 56,370.00
8" PIPE- RPVC S15.00 LF 430 56,450.00
CB TYPE I S900.00 EA 3 52,700.00
EROSION CONTROL 55,000.00 EA 1 55,000.00
SUBTOTAL S20,520.00
SANITARY SEWER SYSTEM
8" DIA SEWER PIPE 30 LF 165 sa,s5o.00
6" DIA SEWER STUB 25 LF 445 sit,i25.00
' 8" CLEANOUT 700 EA 1 S7oo.o0
48" SSMH S1,500.00 EA 1 S1,500.00
SERVICE CONNECT�ONS 5600.00 EA 15 59,000.00
CONNECT TO EXISTING 51,000.00 EA 2 S2,000.00
SUBTOTAL 529,275.00
Page 1
� '� � Page 2
WATER SYSTEM
8" DIA WATER PIPE S45.00 LF 160 57,200.00
SERVICE CONNECTION 5650.00 EA 15 59,750.00
CONNECTION TO EXISTING $2,000.00 EA 1 $2,000.00
SUBTOTAL $18,950.00
SITE IMPROVEMENT S718,326.00
STORM DRAINAGE SYSTEM 520,520.00
SANITARY SEWER SYSTEM 529,275.00
WATER SEWER SYSTEM 516,950.00
LIGHTING & UNDERGROUND 55,000.00
SUBTOTAL S 192,071.00
TOTAL CONSTRUCTION ESTIMATES S 192,071.00
Page 2
!