HomeMy WebLinkAbout03190 - Technical Information Report ^ Core Design,Inc.
i �
C^�� 14711 N E.29th Place Suite #]O1
vBellewe,Washington 98007
�DESIGN
425.885.7877 Fax 425.885.7963 +
� R E C E jEV ori
� ED
m a�� � 2ooa
CUSTOMER SERVICE
FINAL
TECHNICAL INFORMATIO�T REPORT
(T.I.R.)
FOR
CHERIE LANE
RENTON, WASHINGTOV '
� ��P��� 'y,� , , ��'`�
\ p� 1l+',�, ,.�_�`f�z
` ��� Q" :a � Cl' �
� � ' � �
�' �= � -��°'i ���
;5�:j i�� �.32s:;o�� �c�f�
� �� �� £�i�1"E9- � ,
Prepared by: Stacia l�. Schroeder, P.E. � ��siob.�t,�'��
Revie�ved b,y: David E. Cayton, P.E. y
Date: June 2004 Ex���s 5'�T- �3�l�
Core ro.: 03090 ('� --�: �.:�=�'
_ . _ _ . - . � �l�'� � ����R �'EY��'v'�
�3/1`"O
CHERIE LANE
TABLE OF CONTENTS
I. Project Overview I,
II. Conditions and Requirements Summary �
III. Off-site Analysis
A. Upstream Tributary Area '
B. Bypass Area
C. Downstream Analysis
IV. Flow Control and Water Quality Facility Analysis and Design
A. Hydrologic Analysis
B. Water Quality Facility
C. Flow Control Facility
V. Conveyance System Analysis and Design ',
VI. Special Reports and Studies ',
A. Preliminary Geotechnical Evaluation and Preliminary Coal ��,
Mine Hazard Assessment '
By: Icicle Creek Engineers, Inc. Dated: May 28, 2003
VII. Other Permits '
VIII. ESC Analysis and Design
IX. Bond Quantities, Facility Summaries, and Declaration of Covenant
X. Operation and Maintenance Manual
Core Design,Inc. Cherie Lane Page 2
I. PROJECT OVERVIEW
The 4.98ac Cheri Lane site is located near the intersection of Wells Avenue South and
South 35�' Street in Renton, Washington (see the attached Vicinity Ma�). Cunently the
lot is vacant and covered by a combination of pervious and impervious surfaces including
second growth forest with heavy underbrush, and two Category III wetlands. The pazcel
is also associated within a Coal Mine Hazard Area as outlined on the Coal Mine Hazard
Areas Map (attached). The site soils are classified as Alderwood Series, AgC (see the
attached Soils Map). Runoff naturally sheet flows west at roughly 2%-18%o until it
reaches the Panther Creek Wetlands approximately 1/3 mile downstream. There is
however, a ditch in the eastern half of the site currently bypassing runoff through the
property. Using the Sensitive Areas Map Folio for King County, December 1990, no
other hazardous areas (seismic, erosion, landslide, 100-year floodplain) were identified.
The proposed development includes constructing 16 single-family residential lots with
associated roadways and utilities, on 3.070ac. Wells Avenue South will complete a
north-south connection between the Plat of Cedar Avenue (south) and The Stiegman
Short Plat (north). Also, half-street improvements, including utilities, curb, gutter, and
sidewalk, will be made to South 35`� Street (see the attached Site Plan). The remainder of
the site, which includes the high coal mine hazard area, wetland area, and open space
area, will become Tract A.
The City of Renton adheres to the design specifications as set forth in the 1998 King
County Surface Water Design Manual (`98 KCSWDM). The manual states Leve12 Flow
Control and Basic Water Qualiry is required for the Cherie Lane site. Therefore, the on-
site generated runoff will be directed to a combination detention/wet vault located within
the cul-de-sac of South 35�` Street. All drainage discharging from the vault will be piped
to an existing conveyance system in the northwest corner of the property. From here
runoff will continue west for approximately 1/3 mile before entering the Panther Creek
Wetlands, maintaining the site's natural discharge location.
Core Design,Inc. Cherie Lane Page 3
i i i
i i i
'6' i 5,5 i i
�
9� , , i
� ��
i �
N
' CEDAR AVE SE
�i
� I
I � SI� ' 174th �
o I' �, � � �'s
� N
, � I � I 176th ST
� I � I
+I' I � i I
— — — — — — —
I I
I//C/N/TYMAP
� Nor ro scACE + ��
� �
�
� !
F I GURE I : VICINITY MAP
I DATE JUNE 2004 1471 1 NE 29th Place Suite 101
Bellevue, Washington 98007
DRAWN MJS 425.885J877 Fax 425.885J963
APPROVED DEC DESI G N ,
PROJECT MANAGER ENGINEERING • PLANNING � SURVEYING , I
�:., � t;`! �. ( ' .. n � _: � i _ � � ,. , �.. , - r ,
1
�'� ,i� ,� i ,- ' a- ' � I i I ,� � <� � _ � �T�..��
,...
,
'� 'j
_ , : I
�
�,II.,, .t.�. ` y I.. . � s�l. .'I .,. �i �. . ,',j �i.. ,I '-r j . . I � (._ ��.,k :�,(' �r/ .' t�p `�; �.,�1
-� � ` � � —r ' � �. ! '��' r � ' � t�� /I �.'' � � ;'� pI
�l, il � �? � ' �. ' , +t ';�� � f r (;j '' 1 � �l „
� ,,
• . : „
; `
. . , i�{ .., ' r .� �( �. f �..�'1� � ��. � ' :,,�� 1 1 _ �.�. ��j I'P., � . .. . ,`'; ! rtsi:f �;,,� �li � �
,
- i .. , ;.
.�1 �..., t � � 1. •�•:'I '��. �. �:.�.�3 .� : `� �fl 1 �'� ' . � ..�A .�. . . I _ 1� . y/ i�,. ����� � �., .. I ..�
1 1'
,. .i' I .,.. .
'' l } ,. .., ' , .. . . . �
. .. ,
.
���,li ; j`; �.. . ...,ivi�� .,.,:.. .�� ;_ ..�...,`i "' , .-.' .� ` . , ' . �� i �� 1� , ](� / � ..
� , .� ... „ . �.: �.�.. I� r � '�
, ,.. I �.
,. .. .., , ; � � . � '� ; " � ,.,
I. ,.. , , i �: ;r ' ',�k� � ' , J e� �l r1 r' ,
�
, •
� , i , : , ,� , � �. ( I'S 1 / � , n� f ,.. I ,I
1 : ; . : f i.<: , . , ' � '�t •.�,. � .' � �, ; ,. •;- I_.���I i ._ .
- s� - �r, ��
. . ;. ,
. .„ . .,� . . . : ,� i� � I .. S
. : . � . , . „ ,"' ' '' I '�:� 3 ... - . -- - � '�; ��' I %`r�� `... .�._ . -' fT 1
,.,i
I. .. . , .. .. . , � �. . i:.r .. ', .. t�. . ] ei
, � `
i � ` ' ' ' , 4 _ ,, ��a I t �; I.! �,._ f 1��r.+ �'r , t�, (U I� nn�� 9 �i l �;�
. , : � .. , � . ,�� ,� �, _�;j , , � , �l ; � ;
� } �f I � , , ,� �- �
. . , � ,
, ,. 1 i f �}� � , f �/,
.
� , ,
� .�:� : „ �:,.i • 1 s � i i� -_ I
_ ''. . . , ,; ;, i' � 1� t,y �;,�. i f
f i�� � c' �1 ,i-'
� .. . , �. . - �... � �,): . . ...�i �� . r�,1� i,lf � �_���. i..l.-.-. �.� x='� �'I! � y ,1'�.
�f y � ' � 1
.. . ��i�� . . � � . ._ � j .�f.�f j � !� .i i .:.I . . �ih�i` . �, �,.� -, �I� / �rl,i
� � ..,4 I , ..; , � � i � ili� .,�. �,� i � I
-.
.. . �. .. ' : � .� {
;. :.
. . ,. � .
�Y�. �� r�:i' r�l �, ���� � � '� � �
, , � �
,; � , � . � 4 ��
, ;
" � T� i T
, , ..;. �� ; ��
; ; , � , � �� :' � , ,� , � ;';, � � i}� I� ,',�� �
, •� �; . � ,.1 , ,` ...., , , � ( ,. , 'si, '�. I `� .
� , .,+ . � ',�, , - ; - � �r � C �, --�
I���' I ���.�' _� ...��'.. i� _ I� I ��it I t�,..y 'I�I ,' � �� 4 irF� f ,{i. , �+1 {. ..'r � .. ',�
r �:�\ � ' y I � f I'.I ( � � i �{ 1 j � r �i
, � , , , , � , ;�;, , , , ;�, .� I�� � � r �
' .' ` ;,. �, .. ;� � ;` �., , � , �, , r ,� _ ,
.: ' : . ' , '
! .:.. A�.�, ,��` ` �., ` f �._ ' �,'r • y ) . ' I
.
.� .` � ..3 i � � : � I ' � . !.
I �
�
a
... : .. '.: ���.. . .... . ., .� ..
. . . . � 1�. .. � '. i ` �
. ��� ' . ,i ".:, .. .(.... l.. . 1,,, . �I
tl .
I ' �
. . � ��',� . �i.� :���..,�., , ..,... ... �.,... .... k '.�� � u � �".� ! � �,i�
s �
�.. . .. . . .. . , .
I _
t 1..,, .� �.�.��,I � �i_...�hM Y ry.��., ' :. ,$`^.1 f A� �, '� f r � '" ���.i.�.: ���. .
...: ' � '-.. ,. I. . � I + �. � . � .�I, {r f, ' . .� ...� � ���} �r�
� 1 ., � t l �
_ • .. .� � �i .I { � i _,� �,., ti , • C ! � + �;l.. 4 {l'.� i { C ry �T �, t"y � y�, � ,
. . �':' f�: � p �w�.�'� yt x � . r .. i�j I � r .i � t 1 ��r S` ...a� � �r . � � ���.
,. �I I.��f I} . �` . � ���� 4 ..i �i 1.:� Y � , / 1 r L�",.
�" � !
�.. . . ' � ;. C .. u� { { � .
� I 4�'1 I� I ' � � 1. ll, � i� !,�,�' �+'1 �y � �
��� # �e.
� -� �'� ::r� � �� � (
.,.
��.,,,.'� i � ,
t
, . ,.:.` '• ; tl ,ra� :',� F� 4'�'� =`' t `'h i r.s`�.,�a� �,
.
.
. ' ' ' . . ... . ��� 1 .. ' � �I � �I� .I.. � '�i r �.� T �.
..; 1. ,' . �_y .. ,1 F ..
i �f . � . 4 � � ;f .,�.:� � , �� .,... , . .... i°�
I : t
. : + 1 ..• . � �� � . i �.t. � �. 1.�, i 1 �. � ' � t � 1
I I � ' 1 ,'�1_� i t.�1 . i �, .: �c:� .. � t i„t" i, r` n� I � �
�. � �' .,. ' 1 ... �.
. �� • I � 1 7 � , ., . 1 .
� � il �� � � �1 �� r i
i` ' , ' ' ' . , •; ,� , j I,., ' . " ,arf' I.II�I��I'I!! '. � 3 �� � p.. { e �' �i; .5i. i
; . ; ,
.
_ . �
, . ,
4 , i�. �' 1V I JI .� i i
.. ,. . . ;'"' � ..` � S�''.t. �� �,.;� s � �.. .: �' t �t' ��-�,�� � ',,�� �t- . t ... _ . ... . ..� ' . . � .
+ , '.� � , I�,._ I � ;1 �. t+,�} ; ��
;, , , � `
: : ' . �, , a , i }� <,, � ' � � ,_ � .,..
'` r ry i
' � � 1, .,i. , ., � � ��I d ' � �I 1 I l�, � � . �,'S l? i'N,r��t.`l '. ...� �
�
_ �. . _ . �li r. } �,'�.i ! f` ..i I� �'�,,i T� t ., . '� ^ �
1 3 /�'�
... � t y + t ����''F' :�i r t�'�I� �',� � � �,� S � . , \a a � - �{/�
� 1 � ' .:. . � �..
a +� �{ • f� I•"• 4 ��J 1 y� � �6 , r, 4 , • d ''',
� 1, ,. .7. rrt � y rM: i i. ' '1`1 _ i� t I�� �a 4y K r.: � ��� "'+ �,✓ "i3\. •
- i, . ; i i � ° � ' � � . � �i� YA
. � � � �� ��.�` 14 ��. '�� �.. '` I� � ���ti��� �' �1 +. P Y�,��� ( � _ . v�
_ :� '�� : i, .
� 9 , ;r�� � _ � C8
� , ' �a ,'-������ � r, ' 1 ' ����� ��x�
6
_ , . „ � � �- � t l a , ,.w,� , � � �...,..,..- ---
� t t�'� 6'
-.,
� �.,, �; '. � ' � �� �,�.,� ; � '�
-� t�r J �� r.
�; t ,_ _ _ •
. �'y .. . ,:.:.. �� , I
. , �.� � " �''i• v u r, � , i " a � ' ,� ' ��.
� :� . .. .,�: _ � ...'I '., 14 �., � V� i jC3',� .� � { 1� .L.x� � 1
. ... �.. , . �
., � ,� i j F r ' �r , ;1� � l` � ' �� f�•�
,. {
'� f . ; ,.. �I����� � yE f ��a�. -�' � � � 9 if �� {
., . . " '� , { y ��)
��,: �j ;� �k . �. � .. . � ..; . ��.�c I ° a � # �, ' I� ',' a �,;r.��w ro-�f$,�.r�e f � 7� �'`� �i � ��f ° ,
�� � � � l� I.. � i . 1 � -.� N �.1� r { t ��. 1 fy [.; ..'� �l.�`i .9 7„ r n"y:
,� . ''� I ' . .... + �� Y �� .^'T F � � dj � Y�� � rv �� � N
,-
#,�' � � 14 If' . .'^� � 4 j, - ��..., � ��!�....: ',��a + �.�. � 'r � :nf" f ,.:.if4. ;fil���+:.�� � '.a �aJ.-�� �+ '�. � �� ill�l�'� C�t,,��$M'd
� • I 1_ �� ; _. . .;� t � E µi�.,... �;�Y i .t:i. k' � � � � '-"'r � ��„'{ � ..w ,. k., E 3 Vu�C
�.,I . . .. , ..... .
i .... i�.. ���� � ii�.�.., �.. �� � � ... ,^;t . . � �i � '; �rf +,..� P.��� ,I�� x/ 7 ..�. J �'� � �,. �, l. �J P--� '� � � �l��f�?+ �11 �09y�.�0y7
. � � ' i � � � I. � `� ^ ►
� ..� .}�,f .ii ._, . i •:{�h i , n {.; P 1 ' I . � i i � r., 1 C—
� .• r i : i i l�� . , '� , � f , �� _.� � � +w � �, I i {' f c.- r av..
: ,
' .•'''.' ." ., .` , I� '.�: ,.`` -� :,,:..�i f „ k: � i �� �i "Y f'��""j l I�.�..� � 1 I^� a.�.`�- s f r1! � i' � �. r �m�L�,j u
�� i i i i i�. I � I i ,y+l'f y � ! i -�a ��'�I�`� ���y, � .j I +� m
�. ,� � ." .. .� . j d �'� ' R i , ' 0 1S ': ,i �yti � t I-c i r.. � � a.. ���. 1. O�°o F�
s. ., v� .� I y-
- � : i r' I C
�� t � i. 1 1! ,' �� 4 I, . ..� ,K,i..A i��r f � �! � �, � -. � p� .,�.�' . +� 1r.� � � 'f R.�`�i� �f�...0,.�rl �Mr' : I y x�:.'I t��� m il�,C9 y;,�ii
.. ..�� . � � : ... � .:. � � . { ., f- r i - s�: 1 � } ' ��: a i � �p i0 O �
��.. ��.��.� �� ' � �.. ..:. � r` ....� „`F, 4fd � I �1 Ir� R' � w;�� � I �. �. j tm .�f t -� '.. q�C1E�C
; , r . � ' .. , . ,,.�� r:: Y< ; �? - Y ,Y� �: 1 ,3�;� � i � �t�'i u��"'4�i r' ( � .- '. L�,E 0,�3�
; �:� � .� f � ., A �� , r��' � t' �, � 1
i �
. .. :� .. �'� :,: � Ii l + f i �� � f , O
i
' I! 1 �,.,, ° ��' '' � R� ; }���, b i� i,.. ' 'u t�� � �. �°ro��$�
' '., . , i ' �! h i+ � I x� � r � �� = n� To
' '. `,.... ... . � � .� ��� `� ';.. ..''7�` �
. , , _, ,. ��v q
r � � i, y r�'*4 k� � j � �, s ��
q,,� �
, r t y�
. , ��,,,: ' � . . ' _ . � I,.i:;;�� . 1 e,� � � i � �� I � � N ir� � 'V.r� � (..,M�� '.+ C V
� ,y r� � �
i '. ,. ;• Y ; H N, ' ,, r � ai•� 4 ���5 J ', ij 4i1, '�t ftE.f �� ��L..fti���� _����i�,{ � � "il; '��s }s _. �-, EEoc��ro
i� �
; , , . ^' . '
. . . , �� . , , .� � , � j � `
, : , � U� : � � _m�
� � , _
F t I fl
' ,� � _ 1 f . � � . p ` � I � r ' i � j ,v 6 - � l.. �p«�Q000
+ ; . ' � � .., j m
. . �• . : � , � � .:n � � II y .�{ v r � I �r��� � � : i � . . UUN �.,�C
; , , '� '=� t �`r y _ � r , r� � � ' i — ���gCu�m
r
1
� �� ��� `� I � +r Fti� �
',. .. '' I Y '�� , ,- I�� 1 I .. � Y �'. I R f �'�r ! ' � �q�N
, .. :�; . . ,. . .';,- , .....
, `i, i 1 �., r '+' ,� ' , ,:r, ';i � '' �l ' �'` ' . _- " F-ccon 'x
�r
,.•. ,.. � �, d �,�;,. ; ..s.. .:,, I i ,, � � i : er ,;i x��'I �:� „' � wNmad
I� , �
. , . ,; : i
,,. . ;. ., ,, , � r,. , ..t� a� � �.� r1� �� �� � �� �� �.
' :,: ,, ; �, M �< <� �� � .�
. r
, ..
, .,. ,, � ;". � t � •i ! �2 , s � ,�C i= � � �. �.,I �i,
_ ,. � i , . ,.1, i ,4�•,S ! � �, � i .
, . :.: . ., . - fi . „ , . � � �:� s . � � ��..
,
, � i a � � �
.,. . <. , � .:' ; ,� .
. , . ..
_
I
, :; • _ �� ! :, �.. , �, ! . � I a , ,' � .. `,� �; �, �
.. . , , � �, �� ; r S II ��,
, , , I
•. � i � i .�� ., � �.,�, ...:.�.�'. � '��i.!.;�.I . t�,1-' � t �r," � �,r: i' 1 �•.Ii � �,fl�t. � �`}i��.
� I � ( I ; (
, � „ r , .
, . ,. .,. �. � , .� �
� .� . ;;. ��....' ,. .�. I t.� � . . ' . �i� f- �. � �� ,� rl� F�'.A r _...:�.�.L ..N` _ (9':1�;
'��'..- .., - ...
.I' 'i � y �, F� ,
: _ ,
`,.
_.'�' ' � i 1�,;. �" I�! _ ; i �i\ `��' i ..`. j . 11 � :"• � �y�)� 4z I1`...�qlf�� �`.'^ ni , r . 4Ucv
+ � �: , . � ,.,,• . c.t i '� i � i �i : I ! :.i ?'.} i �'� p l��' i � lF �..:i:I ! ' ?p
, -�
. ,, f
. <,' ' ' �, �� a t� � + J� 1����� � > >
i i
:.; ' ,..' ,, .,, , , . : . , i. , � ��w I � i� j�� I I ;r I� �� ' i fY,� � i, ;� i`
. .. . �.. .. , • .. . .�. .�' �a:�. .i� f��
i � i i 4 �� '
, ; i., � � �„ ?
., .. . . , ..... �
4
'
. ...: . . . . . .. .. I 1 4 i
i '� j ' �
. .. . _.{ ..�.: 1 . I.. �,�� �� i � �� �It �I ��r ,m�.-� �.
� .. . . �� '.. � .. � �I1 �I I C�� � t �I . rl� ..� ��� ��� � ' � { �' � � . .-
. , . .,.� - .. � . - � � � 4'�' 6 �, I ��t r�i � �t� . ai f�' �_p
� : .. . •. �. � � � . . +� f 1 i . ;'.
' ' :. . .. . ' � ., . _ . . � i II��. I �,�I. ,I.�. � �I�7�N{ ��� �� SI I.1:I y <�Vr•. �?� �' j t _
: . . �.,.- .' _ ( w4
� : �� � ' . : ..,.' ' ..� !� .F.. . ..! i i .: i<< N I I f:�,'� I � tI,.I^+ �ll�f C �h'�t 4�i 1 [..,� t 1 4`\' r f �Ur � ��> >
- � `, . . .. � .,, . '�..� :'' + . �{�o� .L,� I i I� j �f �i + � �1111'����{ , ' � f �7 �Y � u —?r� ��7 �
. , � . .; . :. .....; . .,..: r
! i4 � I e``
, . .
' I il � ,�
��.� ..� . ... . 1 � �, . �..,,� � '�:. ' � 1�. (, �� '-�`ti� . Y I „ hl-I���� �'t i �) '� jl � ,.+., � a7'.�,?' t
. i �. `, i I
.,� ,� . � . . �. .� � ..,,�1,��R•.. '','. � ,.r�� a ` d�1 ,f�it�.� 'I C ti y'•,o,..��z � � ��,
.;. ..,,. �� '� � ,�. ., . ...:.. '�. �.,., . '���1 ' •.,. � i..:.i. I r � ` '�Y � 4 ' .�_ � ._�':, i ��� �rJ �u .
. �- r l ., I , ` .
, .,. ..:......... .. . � .,. . , :' � ... �.�.a�.. i �,.�i i i...i , i � ��I � � -,i � i s I' �+�'l� � � .Ir �I� � . \ !' .i s.�; . �'ri
l r
, . ...� • ( �
, ,� �.. '�.' ' ' .. ,� ..� . _..... • ..,,.. ;._. .-.;,. . .:.��',. ,�...:; r-_.�i '� � i � ... � ���� ' r��? J T il.�y� ���� 1: ' VK�:� . L � ���
,. ... .,, .. .: I
_ ., ' , . .,., . .... t, , }. y . I I'j _ �, i
� i _�
� , ..,. .j "' . . - �ro �-
� ..'1 ..� i E �4 � � .�i� �:
.,_ ..i � � I� . I � r' �,
' � ,
, .. � . . _
� � � , � a t�,F . t.
,, ; ... . . . .. . . , '.•,; _ i:..'. � ,. ( �. � !.i �� �a � � r'��._s n a
:,; � ,�,
r I a. t�
14 !
; . . ,.. . _ , .., . . I .
i
� ; .. .., : � �j..� � i . ' �i I � .:O l �m .
.� . , . .. . , . I�i 1 "1:t � . .:.1 'tl �,...
,.
� , . . i�� .��. . . ,i. . � � .� �, � I< � i�
. ,. � .. . �.:' � .. .�. . _ + ��� .
� n I r t
�.� � . , . . �� . . . .�,- :. ,,,� . J
I � 1
,i �. 1.. f �,. � � '�l e i i � .�� . ti.p:y
. ,
-i.
� � . ,.. .i.�, .� � ..i:��� t ,.✓.�,. .�. .:,� ,.�.:,. r.. !. Y �.:'�'' ".r.. f}� �.
A
. .,..�' ' - ' . -'.'�' '. . �i' � ...'. I .�� .I'.�..� � . � - 1 ��.
.
; .r .
, . , � . .':J �. ni
, r�
� : . � :'. ! -'�.' . .... .' i� i.
� s..
�
,'
. . . � r � ..I .�. � . y � � ,
� I �'� ��I� �,�:.i� i �' i � � ,: � �7 G.t ' J i•7�
�, i . � i � ': � i.�,
� � � - � .y� �' ,' � i ���i �i I i �'�� I i �" 7,+i
�l � i � r
i I ' .� i 1.- ��1 't � . J w,I�`! .. -� „ -
. . . � ..I � � � I 4 r�� ��.. .� � I .Y i � } ...�
, ,
- �' , r� _, :� '
� \
, ;. . � .
, � , .. . .... i. . I .. . I � .'.l. ,
� � 1 t
.' . ' . •'I.. x . '. ` I .
. 1 i � I. .1;...• .
��' . . ' . . � ' �' 11��
li 1 .��
. 1 , �' . , r ' _
.
i .. .
�.. . .
..l.. . • :. •.� .. ..
� .• � .. •. �. I
. . . �)
11
`1 �..
. . � I� ,I� � ��.7
� I� .. � ��,�i
� �
' �''
S �
��;� � s • A
I � ` -� �� `���' g;�; u� ,�• �. ° i.t i�c U. S. DEPARTMENT OF AGRICL"LTLTRE
�, � -�-- �� SOIL CONSERVATION SERVICE
� � �, , . � '' �
I I � � i � _��� i � a _ � �. • - - - - —
t � �� - AmG
� � PA IF � , � � � � .�` s -•---, I
� � • � �'� -•---_•_=_: SHEET NO. 11
I ♦��. � � �, '� - KING COUNTY AREA, WASHINGTON
�' `, '�_ _ _ - -�'"� e Sub (�NTON QUADRANGLE)
�o� :12A e, ♦ 1 AgC - '�'" �'?,� `_- -- - �� .
I e '•�. •_ ��� ..:` ° ,�\neo� 2p . �s r � � f°'^�'`
. •,�. -� . ,- 21 , ��'•
16 . i • 455 '� y� I�(
� Pu 9 : �. 'L � : ^ y,;' � n
' I � i ` "• �C �'a. . AgC ;��.
� Ur � .•• ~ '} , / ,P �`�a � I
I PU. t n'r9� . �' : . . q.�.:
� P� o:� \ 515`` AO�E n \��a.
I Wo' eD� �� �dnrBeC� ,� * \� �F�
� ' , : . '•
I � U , ", .«i;� I ��►8D �� •�. �
•i��N . .
t -- — — — 10 B —�-- -----`=`�°y, ----- --- � -- — --
I Ur ! ' �, 1 ;?,� Z6 ; i
❑ R rvair � AgC
I r d• �� W �
so -T� Z � "
Pu �',� m Sk � � ti: A
� 1
M .
I
tk .
I .
� - �' �
u
I
AmC
��• BM ` •.
J 168 �203 �C I� 29 , :�'� AB8 Ui
1 - - ` � I . � �
Sk I 1.1. ° 452 ;
Ur =� � o IASC � �`:�� � �
. ,
s . � � ' ° x '`
. .. .. - . ,o�.� �, � � ���a .- . AmG n . ., e�r�, �i c _ �. '�t- .
I . .TU. � �. � . � +a _ o , :�f�:� -� _ \
� ' InC qg - ��` `��:4 C _
_So _�� I AHD � TB ;•, .. •t . ��g.�R(?r?iK ,,rl �
173''s��• r �'-'-- -- =1y�- 93 ��•u
� Vo =__-- — — ---�- �Q .� -- _� 1� t ` -- -- —
_ �. 194 i N� • • �` � •``
x Ag8• ti TM' ' Sk
� ,!n \ ••� • 3 I AmB � 3 j
a � r� u w," �..
� pgC �� �.� � _ p ♦ `
' = I M A AmC' ::: • ��.AgE M� sg�.•.
.) . . . 0. �' G� �} .��_�_ ..... . .r• itC 1� p. , `
� a 9 _ � : �� _ � �,q4 Ev8��,
t � �' •: a� � AmB . u
1 -Ur .. � � cj . SP � • �HB �ABD�.� 3k ,�,F
3 � � ' -- ->�� O 32 ' �� ,�- ,� P.
� � AgC � .� ° 1 •�K. D� �. AgB � q 9�}.• :w
� � � ' ' 3 � ... :,.���� � ��"'a
D � c� �,ti . .. 'AgC
w I o . ' : � �. •
! � .� 8 ; . •.�+ Ag ' .No .ti.��
I Br Re, � ��_ �v Wa�e, � � .: 04� ` �...
No C O � _�� `�i� Tank. � •'� - '-• _ .�. ;..
. _ V I , •t _ BC . _°� . _
SO/LS MAP
r = 2.000'
"I GURE 3 ; SOILS MAP
�ATE NOVEMBER 2003 J471] NE 29th Plcca Suile 101
Belfewe, Woshing/on 98007
JRAWN MJS 425.885J877 Fax 425.8857963
�PPROVED DEC DESIGN
PROJECT MANAGER ENGINEERING • PLANNlNG • SURVEYING
i � > (
I ' � �r
: ,
_
, ..� �
� �' � !`- - J � I 1
� � �_ � —� ' F
� �5 �
� � 1 ~� \/ � I `�p � ����
� .. _ ,.::,� \.. I '1
,� �� PROPOSEG 12" `'
��z.t' To s 't � � � I t i�
� ��,,���, c� ;�. , STORM DRA/N SYSTEM � ; , !!i
= ; i ,I �
; ;;
� ��.�7�-�.� �� �� - -- - -
/ ��....�-�---���:ri:aZ:c.r�___ �""'i t�•� ����� r`/
-' -
���� � ������.ry�4��T�r-- •^'����� _ ��=c�G�J/I"1 J/�CF�_,._ __ ( � � - � � �
� y � � - - -�—=- - '�-- -�` �- 'g / i � t '3 I i � � f' /
�:- - ---- '° � '- �
;y� � -�l :_ , '; ,F � -° I ` �� � �� —�� - ' � __ �G , �K '�
• - _ "t 1 y l �� � _ � � I � ,�
'� _�_ �--- -,.�.---F� , �_ _ _ � --_ � �-y.`�. �`� � �
� �
/ w � .�_ ; .z _ :\ > _`�i�- =- - - - -- - I�
.
a��� . � .
� t ` �/_�' �"""`- /� - -- f - -- - - - - - - - - - � - `.
Y�+
. ` . . �
I
� � ' r�� - - -- - � - -_ - - � � � � � � '�� , -'
�� � � � /� \ � � ( � ��- � � � � !�
� � � � �
� ,
C, : � �2 � _ ��� � �� ' � -� � � = � � �� � �: � ''
__ :
__ �
._��
'�, ` ' 1 ' ' A ; � » -� ;�. '` ��. � . �i 9 I �
__ � � i t ...r-- � � I � . �
,, I I , , � _.-- I I�
.. w_ �
. .
;
= .
;
,� , � � 1 --� ; � � � � � � -
��
� f �
,__ ' I � � ; � � — — 3 ! = f:
, 1 ; } _, r _ ( , �
; �'\ _._ , ;` r '_� � 1 ; :. , � / `'e--��.�
�
f ' I �� � , i_�_�..�..,./, ,�� . ��. � i
—, . � X
�� --��,` �`�_ 1 `- --J __...�l _ � � � 3 I �� .
� � ! _
� ,_ _ _ �� � `� � \ ! , .� � �;= - l�- � ; � �_-,
� . I � � I
'
� 16 i� � ' \� \J -- ,� 1 ,/ / � �� �3 � '� � I � EXIST/NG
� I �! 13 � � � , I �' � } � �
15 � �4 f �, � EXISTING WE�LAND � � � � ` I ; ' DITCH FLOW
,,
� � _ ' 2i�2o3t sF '� � } —� ` ` , _. —� �=' li TO BE
.
: .
,X � , i , : > > � � l ; _ ; , -
_ :
° , � I / ,, / `'�� J ` ,�' � , I � ; : BYPASSED
-�.� � ' � ,--_.. r' � i _ ��
-
' � � :
� � ( �< / r�-Y_� = -_ �-� _ _ _ / _— £ I i
,___ �
_�� � , : �
_ .
� ' : / � ��+�!� ; � / � � _ � � I:
• �,�.�..�.� ; � � .� . , _ �
L.—_ t . �� �,� :,.� �—� _ �
� .
, � e_�.�..,-.� _ _-- , . � _ ��` d �
- _ - - '�``P � W£f1S ,9-1� .� . ° � , �fr—` �,
. �--�-
( . , � �
`'����
'—'' I /-- — ,�,�� � _r ;� _ - 3 ' � I� � :
�`\ � � � � j�� � b9 I$
�
, � _ � � \ : � ar � -- - �_ �� ,
�, � . � .
, / t
• \\ � � � / - i , . -- �s -� ` ; .�
;
,
,� _�
� � � � - —�--v'�" _.�L�.���i �t 'f � �
: i � I i� � �� : _ / - — . —_--- -- � � { s � �
� ,_ - �
� _ �
I - _ : , . ( ' ;
_ _ ,� _ _ t �,
; � �, �.,� � , - .- - � � ; � � , :
i � � � � � ` � � i .� � N
� �
-�•�' � � ;' : � ; , ' ( � _ i
l \ � � ;- ; . �__._ -- -
> � ; � � , � � � �� ; � � ,�
� � ` _ ' � �
�\�� � � � � � 1 2 { � ¢ :� 5� =I�-�R i;
,
l\ � �I ` � I I EXIS NG &PRO SED
, EXISJ7�ING WETLAND 1 J \� � I � I RUN F � � I I
�
, �
:
,
� ; ; i °`' � � __
\ & COAL M/NE HAZARD AREA �Q�, I/ i ;-� : � I � `� �'� •S(IALE� 1' _
— // � /� '� ,� , ( � / � � _ .,� `
�� � i I / / E ,—����i � ����+��r�i�...��--- o xs so too
\� _ � �•���_�,�rj�!�'1.��� -
-� '� ��.�.+.�•��� \ � , r - -_ .
�r'` � _ / �
�� / .. .:i , : _.
I �1 � _
,�, .
''
�� - - :t � � / �' � CHER/ E LANE
� f
-�-,- .� � � �
_____
�� _ — --�`�- S I T E P L A 1V
I i.�_-..-z=.�__-- _ -�'-- J`__ • .—. � _ �r- `}--_` '; -- — — -�
STEVEN B ECK
I 19129 SE 145TH STREET
RENTUN WA 98057
ia?IINE29rh>��n,��a� DATE �C/LY2004 SHEET OF
e���ewe,washingro� 98007
�DESIGN ``i9as.�anr,r75.B65J963 DESIGNED D£C 1 1
eN�iNeeRiNc � r�aNNi.tic suever�Nc DRAWN ,$K$ PROJECT NUMBER
03090
II. CONDITION'S & REQI'IRE�'IENTS SUVTI��IARY �
Conditions and requirements for the Cherie Lane project include: I!
I. Preliminary Report to the Hearing Examiner (February 3, 2004) I
( nrc I�csi��n. (nr. Chcric L:�nc i'.i�„c -1
(�/ � =�i`� �
-� ����;-��; ��;�:�-
City of Renton
PUBLI� Department of Planning/Building/Public �lorks
HEAR/�1G �,R,��l�llllVARY�,'�f'0�4� Tt� ��1� HFAd�INf� �XAll�l�l��?
,�. SUMMARY APID PURPOSE OF REQUEST;
Public Hearing Dafe: February 3, 2004
Project Name: Cherie Lane Preliminary Plat
Owners: Peier Gannon &Sandy Vath 1235 Bristol St. Stockton, CA 95204
Applrcanf: Steve Beck 19129 SE 145`"St. Renton, WA 98059
Contact: Lafe B. Hermansen of Core Design Inc.
14711 NE 29'"PL, Ste. 101 Bellevue,WA 98007
File Number.• L A-0 -1 Pro'ect Mana er. Fi la !CP
U 3 10, ECF, PP J 9 Susan a , A
Froject Descnpticn: The applicant is requesting Environmental (SEPA) Review and Preliminary Plat
approval for a 16 lot subdivision of a 4.98 acre (gross area) site. The site is located
within the Residential - 8 (R-8} zoning designation_ The proposed lots are intended
for the eventual development of detached single family homes — lots ranging in size I
`rom 4,540 square feet to 6,271 square feet. Access is proposed via a new half-
street, S. 35`" St., that extends west from the proposed south extension of Weils
Ave. South. Two wetlands and an abandoned coal mine are lacated ��vithin the site.
��oject Location: South of the southeriy terminus of Wells Ave_ S. at approximately S. 35`h Street
i . . .�'� . ` � 1-_ 4,�r �
f '��.r r 5�
wk Y � �
' •1 9
y �D !M e� F� ! :
� +
y�r nlr;� . �r r s �,'n ` �� . �j.
\ ��a�+;.��r�.� J .<a., � : !b
I '_ � ei_ �+ � •�i
� — w �
1� _ �� � -�-- -s U
j. �, _� , ,s,y,,.. ,� � „ � �, �� � � �
; _� � � . . . � ,
f 4 = ' ' �T., � ?`
� l...nw 811g M � �� a •` R
Q � � / � y � �
�
' � � � i '�`� f
' �J�,,� i� ,� t Y,
�
� � i � ;, .�;
` ° � J `J�;;.;,
.� y �'
:�f �� ,
y !
� �' � . . .��(�� t i ...
� � i M �� � r �_ �
� .a. rxrn � � �l'� �•gy,. 'r
r .--=�r!! I \�
� q � y " f 'w Y� i.i
� .tt�. Si 1_.�-�'' �
� � � -� � �' �`��''����'[
I + a. .� ' �� �'�ol -V—�i
i / �� g �`�,'� �,,�•• 1��--_,1
`�� ' �y� � aT. � �� ��K �x� 9�''r�� r---:�� -_-�
�,. R�°7,�.�. �.y E �
, . _ .
C�ty of pentcn P/E/PW Cepartment Preliminary F,eport'o the Neanng Examiner
CNERIE LQPJE PRELiMINARYFL4T LUA-03-1�0, ECF, PP
PUBLIC NE4�41NG DATF:FEBRUARY 3, 2004 Page 2 oi 12
f3. HF�f?11NG E:YH/BITS:
Exhibit 1: Project file ("yellow file"}containirg the application, reports, staff comments,and other
material pertinent to the review of the project.
Exhibit 2: Neighborhood Detaii Map {dated 11/13103)
Exhibit 3: Preliminary Plat Plan (dated 11/13/03)
Exhibit 4: Plat Revision to Lots 1 and 11(dated 12/01!03)
�xhibit 5: Preliminary Grading and Utiiity Plan (dated 11/13/03)
Exhibit 6: Zoning Map: Sheet H4 West (dated 03/11/03) ,
G. �G���RAL INFORMATION:
1. Owners of Record: Pe#er Gannon & Sandy Vath 1235 Bristol St. Stockton, CA 95204
2. Zoning Designafion: Residential—8 Dwelling Units per Acre (R-8)
3. Comprehensive P/an Residential Single Family (RSF)
Land Use Designation:
4. Existing Site Use: Vacant
5. Neighborhood
Characteristics: '
North: Single family residential; R-8 zoning
East: Single famiiy residential; R-8 zoning
Soufh: Single famiiy residential (proposed plat-Cedar Avenue); R-10 zonina
West: Single family residential; R-8 zoning
6. Access: New hatf-street improvements to new South 35ih St., extension cf
Wells Ave. South and private access easernents.
7. Site Area: 4.98 acres (29 7,203 square feet—gross area)
8. Frejec:Data: Area Comments
Existing Building Area: N/A NIA
New Building A�ea: N/A NIA
Tofa!Building Area: N/A N/A
�. HISTOR/CALBACK�ROUND:
Action Land Use File No. Ordinance No. Date
Annexation N/A 4819 10117l1994
Comprehensi�e Pfan N/A 4498 02/20/1995
Zoning N/A 4820 12/15/1999
hexrpt_CherieLN.doc
City oi Renton P/8/PW Department Preliminary Report to!he Nea�ng Fxamrrer
CNERIEL,4NEPRELIMINARYr�(1?T LUA-03-11Q, ECF PP
PUBLIC NF�IRING DATE:rcBRUARY 3,2004 Page 3 of 12
,E, ,4��LdC,��L� S�C�14nlS OF TNE �R��lTON IYIUIdIClP,�L CODE:
1. Chapter 2 Land Use Districts
Section 4-2-020: Parpose and Intent of Zoning Distric:s
Section 4-2-070: Zoning Use Table
Section 4-2-110: Residentia! Development Standards
2. C�apter 3 Environmental Regulations and Overlay Districts
- Section 4-3-050: Critical Areas Regulations
3. Chapter 4 Property Deveiopment Standards
Section 4-4-030: Development Guidelines and Regulations
Section 4-4-060: Grading, F�cavation and Mining Reguiations
Section 4-4-080: Parking, Loading and Driveway Regulations
Section 4-4-130: Tree Cutting and Land Clearing Regulations �
4. Chapter fi Streets and Utility Standards
Section 4-6-060: Street Standards
5. Chapter 7 Subdivision Reguiations
Section 4-7-050: General Outline of Subdivision, Short P}at and Lot Line Adjustment Procedures
Section 4-7-080: Detailed Procedures for Subdivision
Section 4-7-12Q: Compatibility with Existing Land Use and Plan-General Requirements and '
Minimum Standards
Seciion 4-7-150: Streets—General Requirements and Minimum Standards
Section 4-7-160: Residential Blocks —General Requirements and Minimum Standards
Section 4-7-170: Residential Lots— Genera! Requirements and Minimum Standards
6. C9�apter 9 Prac�dures and Review CTiteria
7. Chapter 11 d�efinitions �
F APP�LICABL� S���ID�1S OF T,�IIE �CflMPR�HE�ISIVE PLAfV:
1. Land Usa Element: Residentiat Single Family objectives and policies; Residentiai Streets
objectives and policies; Subdivision of Land objectives and policies.
2. Housing Element
3. Environmental Element
G. �EPARTIVIE�IT.�,'VALYSIS:
1. PROJECT DESCRIPTION/BACKGROUND
The applicant has proposed to subdivide a 4.98 - acre siie into 16 lots and one tract. The site
consists of one parcel zoned R-8. The lots are intended for the eventual development of detached
single family residences. The site is currently undeveloped and contains two Category 3
wetlands. The southwest portion of the site was used for underground mining and is within a High
Coal Mine Hazard area.
Tne site gently sfopes upward to the east at one to two percent grade in the west porion of the
property that increases to a five percent grade to the east. The property is forested with conifers
(cedar) and deciduous (cattonwood, cherry, willow and alder) trees �Nith a dense understory or
brush. A geotechnical report was submitted and indicated that the site is suitable for the
construction of single ramiiy homes utilizing canventional spread footings.
The coaf mine hazard assessment re�ort indicateti that underlying the proeerty is ore abandored
coal mine and one `Prospect". Tne coaf mine, named the "J & J Y1ine", anc the urnamed
"Prospect"were aciive in the 1930's.
hexrpt_CheneLN.doc
City of Renton P/E/PW Department Preliminary Report to ttre 1,'earrng�xamirer
CNERIE LANE P,RELIMINARY PtAT LUA-03-;10, F�F PP
PUBL'C HEARJN'G CATE:rEERUARY 3, 2004 Page 4 of'2
The Environmental Review Committee placed 18 mitigation measures on the project inc�uding
those addressing erosion, coal mines and building setbac;:s. A weiland delineation report was
submitted and stated that two Category 3 wetiands are located on the site. The wetlands, bufFers,
enhancement and creation areas are delineated on the proposed plat.
The plat is split by the location of the wetlands in the central portion of the site and the new street
extension of Wells Ave. South. Ten lots would be located on the east portion of the site, ane lot
would be isolated and abut Tract A (containing wetlands, coal mine area and open space} and
_ the remaining five lots wouid be in the northwest portion of the site. Lots 1 througn 10 are
arranged along the east side of Wells Ave. South. Lot 11 would be accessed off of South 35�' St.
Lots 12 through 16 would be accessed off of the cul-de-sac on South 35'h St.
The proposed !ots would range from 4,500 square feet to 6,271 square feet in size and generally
be rectangular in shape (lot lines at right angles). One tract is proposed, Tract A, to contain the
high coal mine hazard area and two wetlands. The project would include the installation of utilities
and the dedication of public rights-of-way.
Proposed density for the 16 lot subdivision on the 2.77 net acre site (4.98 gross acres) wouid be
5.77 du/acre which is in compliance with the Residential Single Family eight dwelling units per
acre (R-8)zoning development standard.
Access would be via the southerly extension of Wells Ave. South through the �lat and new South
35�h Street. Wells Ave. South would be extended south from its current terrninus at Sou#h 34`h '
Street and constructed at a reduced righ:-of-way width of 42 feet with 32 feet of pavement. The
proposed alignment would connect #o the same road praposed within the Cedar Avenue Plat '
(LUA 02-125) and bend around Tract A. New South 35'h Street would extend west from Wells ,
Ave. South and termina#e in a cul-de-sac. The road wouid be constructed to half-street ,
improvements of 35 feet of right-of-way and 28 feet of pavement.
Ap�roximately 45,376 square fieet of the sife area is identified as street right-of-way dedication (S
35` St. & Wells Ave. S.) to the City of Ren#on. Tract A covers 51,093 square feet. The right-of-
way dedication and wetlands/critical areas would make the net area of�he site as 2.77 net acres
with a density of 5.77 du/acre site.
2. ENVIROIVMENTAL REVIEW
Pursuant to the eity of Renton's Environmentai Ordinance and SEPA (RCW 43.21C, 1971 as
amended), on January 6, 2004, the Environmental Review Committee issued a Determination of
Non-Significance - Mitigated (DNS-�1) for the Cherie Lane Preliminary Plat. The DNS-IVi include�
18 mitigation measures. A 14-day appeal period commenced on January 12, 2004 and enclec� on
January 26, 2004. No appeats were filed. II
3. COMPLIANCE WITH ERC MIT1GATlON MEASURES I
Based on an analysis of the probable irnpacts from �he proposal, the Environmental Review II
Committee (ERC) issued the following mitigation measures with the Determination of Non- I
Significance—Mitigated (DNS-M):
1. The applicant shall install a silt fence along the downs/ope perimeter of the area that is to be
disturbed. The silt fenc� shall be rn place before clearing and grading is initiated, and sha11 !
be constructed in conformance with the speci�cations presented in Section D.4.3_1 of the �,
King Counfy Surface Water Design Manual, Appendix D. This wrll be required during the
construction of both off-sife and on-sife improvements as well as building construction.
2. Shallow drainage swales shall be constructed fo infercept surface water flow and route the ��
tlow away from the construction area fo a stabiGzed discharge point. Vegetafion growfh shal! ,,
be established rn the ditch by seeding or placrng sod. Depending on site grades, it may be I
necessary to line the d�tch with rock to protect the difch from erosion and to reduc2 tlow
rates. The design and consfruction of drainage swales sha!! confcrm to the specificarions
presented in Section 4.4_1 of the King County Surface VVater Design �'1�9anual. Temporan�
pioe sysiems ,;an also be used to convey siormwafer ac,ross �he sife. Thrs �Nil1 he �2QUlPcd
hexrot CherieW.�oc
C;ty of Renton P/B/PW Depanment Pre:imrnary Repert to the Heanng�xamine.�
CNERIE L4NE°RE�MINARY P�,4T LUA-03-110, ECi-, PP
P�BLiC HEARING DA;F:FE9RUARY 3, 2004 Page 5 of?�
during the constructicn of both off-site and on-srte improvements as weU as building
consfruction.
3. The pro�ect confractor shal! perform daily review and marntenance of a!1 erosion and
sedimentation control measures at fhe site cruring fhe consiructien of both oif-sife and on-srte
improvements as we11 as building construction.
4. Weekly reports on the status and condition oi fhe erosion control plan wifh any
recommendations of change or revision to maintenance schedu/es or insta!lation sha!! be
submitted by the project Engineer of record to the public works inspector for the prelimrnary
plat construcfion. Certification of the insta/laiion, maintenance and prcper removal or fhe
erosion control facilities sha!!be required prior to recording of the plat.
5. The applicant shall�11 all sinkholes located on the site with compacted soils.
6. The development shal! nof place any building strucfures, sform water defention facilities,
roads or utilities within fhe designated high hazard areas, and shall be resfncted from the
use of mine rock frlJ containing more than 20% coa! by weight as strucfura/ filL The
satisfaction of these requirements shall be subjecf to the review and approva! of the
Develcpment Servrces Division throughout the duration of site preparation and building
consfruction activifies..
'. The development shall place all structures a minimum of 15 feet from the High Coa! Mine
Hazard area boundary as depicfed on the plat. A note shal!be placed on the face of the plat
stating this requiremenf. The satisfacfion of this requiremenf sha!! be subject to the review
and approval of the Development Services Divisron prior to the recording of fhe frna!plat.
8. The applicant shall insfall nermanent fencing (i.e. split rail or other approved barrier) wrth
signage at visible locations around the perimefer of the high coal mine hazard area and as ;t
exfends into Lots 14, 15 and 16 in order fo provide adequate notic� to residents or visrtcrs '
that fhere are known coal mine hazards in thrs area. The satisfacfion of fhis requirement shall
be subject to the review and approval of the Developmeni Services Divisron prior to the ,
recording of the frnal p/at. '
�. The applicanf sha/1 place a note on fhe face of the plat, as weU as record a resfrictive
covenanf, subjecf to the review and approval of fhe City Attorney and the Property Services �
Secfion, prior to the recording of the frna!plat whrch states the following: '�
COAL MiNE HAZARD NOTICE
The lots created herein fall within a coal mine hazard area as identified by a Geotechnical Engineer
at the time of this subdivision. Presence of such a hazard may trigger mifigation measures at the
time of construction. No structures or improvements shall eccur within high hazard areas. �I
10. The applicant shall record a restricfive covenant to run wrth the land that states the �
developer and aU future home owners wil! hold the City harmless from any damages I
occurring from land movement, slide, collapse or other s�milar event caused by the coal '
mines known to exist beneath the site. Ttre satisfaction of this requirement shall be subject
to the review and approva!of fhe Developmenf Services Divrsion and fhe City Attomey prior '
to the recording of fhe final plat.
11. The applicant shal! comply with the recommendations contained within the Wetland
Evaluafion Report, dated Movember 13, 2003, as prepared by AlderNW in regards to
wetland maintenance, monitoring and construcfion of fhe project.
92. During site preparafion and construction of improvements and residences, the applicanf shall
install silt fencing with brighfly colored construction flags to indicate the boundaries of the
wetland area and buffer. The satisfaction of this requirement sha!! be subject to the revierv
and approval of the Development Servrces Division. ;
13. After the developmenf of roadway and utility improvements, the applicant sha!! install
permanent fencing ;i.e. split-rail fence or other approved barrier) and signage along the ,
enfire edge of the wetland buffer to denate the critical area. The satisfaction of ihis
requirement shall be subiecf to the review and approval of the Development Services
Drvisicn prier to the recording or fhe final plat
nexrpt_CherieLN.doc
C;fy cf.Rentcn PB/PW DepaRment ��eliminary Report io the Nearing Examiner
C�'�E.RlE L,4NE PRELIMINA.RY PLAT LUA-03-170, ECF, PP
PUELiC h'E.ARING �A.TE:FEBRUARY 3,2004 Paqe 6 oT;2
14. The applicant shall comply with the 1998 King County Surface Water Drainage Manual Level
2 Flow Contro!for the project.
15. The applicanf sha!!pay fhe appropriate Fire Mitiqation Fee based on a rate of$488.QO per
new single family lot. The fee shall be paid prior to the recording of th.e frnal plat.
�6. The applicanf shall provide the necessary means of access to serve the develapment. The
safisfaction of thrs requiremenf shall be subject fo the revrew and approval of fhe
Development Services Division prior fo fhe recording of the frnal plaf.
97. The applicanf sha!!pay the approprrafe Tra�c Mitigafion Fee based on $75.00 per each new
average daily trip associated with the projec#. The fee sha//be paid prior fo the recording of
the final plat.
98. The applicant shall pay the approprrafe Parks Mitigation Fee based on �530.76 per new
srngle family lot. The fee shall be paid prior fo the recording of fhe nnal plat
�. STAFF REVIEW COMMENTS
Representatives from various city departments have reviewed the application materiais to ;dentify
and address site plan issues from the praposed development. These comments are contained in
the official fiie, and the essence of the comments has been incarporated into the appropriate
sections of this report and the Departmentai Recommendation at the end of the repo�t.
5. CONSISTENCY WITH PRE�IMINARY PLAT CRITERIA: I
Approval of a plat is based upon several factors. The following preiiminary plat criteria have been
established to assist decision makers in the review of the subdivision:
(a) Compliance wifh the Comprehensive Plan Designation. The subject site is designated
Residential Single Famify (RSF) on the Comprehensive Plan Land Use Map. The objective
established by the RSF designation is to protect and enhance single family neighborhoods. The
proposal is consistent with the �SF designation in that it would provide for the future construction
of single family homes and would promote goals of infill development.
The proposed plat is consistent with the follawing Residential Singfe Family policies:
Land Use Element
Policy LU-34. Net development densities should fall withrn a range of 5 to 8 dwelling units per
acre in Residenfial Single Family neighborhoods. The proposed plat has a net density of 5.77
du/acre which is within the allowable density range.
Policy Lt1-35. A minrmum lot size of 4,500 square feet should be allowed in single famrly
residential neighborhoods except when flexib/e developmenf standards are used for project
revrew. All 16 lots equal or exceed the minimum of 4,500 square feet. The smallest lot is 4,500
square feet and the largest lot is 6,271 square feet.
Policy LU-70. Streefs, sidewalks, pedestrian or bike paths in a neighborhood development
shou/d be arranged as an inferconnecting network. The extensive or predominant use of cul-de-
sacs and pipestems should be discouraged for new development. A "flexible grid"pattern of
sfreets and pathways should be used to connecf adjacent and future development. The extension
of Wells Ave. South through the plat would be aligned with its extension through the proposed
Cedar Avenue P1at, located immediately to the south.
Policy LU-73. ResidentiaJ streets should be constnrcted to the narrowest widths (distance from
curb to curb) feasible wrfhaut impeding emergency vehicle access. A reduced right-of-way from
the standard 5o feet for residential streets to 42 feet wide is proposed.
hexrot CheneLN.doc
i
Cify ot Renfon P/8/P�iV Deparfineni Preliminary Report to the Nearing Examiner
Ch'ER1E L4NE PRELIMINARY PLAT L UA-03-110, ECr, PP
PU6L/C NEARING DATE:F�BRUARY 3,2004 Page 7 of?2
Housinq Element
The proposal should be consistent wifh the Comprehensive Plan Housing Element. The addition
of sixteen (16) new singfe famiiy homes to an undeveioped property would increase the Cit�s
housing supply, thereby furthering an objective of the City of Renton. Policy H-4, "Encourage infil►
development as a means to increase capacity," would be addressed by this project.
Environmental Element
The p�oposal shauld be consistent with the Comprehensive P/an Environmental Element. The
site is located within a high coal mine hazard area as identified on the City's Critical Areas Maps.
Two Category 3 wetlands are also located on site. In addition to the applicant complying with
wetland and high coal mine hazard regulations, the ERC issued several mitigation measures on
the project to mitigate impacts including but not limited to: providing permanent fencing and
signage around the critical areas and recording restrictive covenants. Policy EN-82, "Show the
location of coal mine hazards on any plat or site plan maps...Such documents should be
recorded," would be addressed by this project.
(b) Compliance with the UnderJying Zoning Designation. The 4.98 - acre site (gross area)
consists of one parcel designated Residential — 8 Dwelling Units per Acre (R-8} on the Cifi� of
Renton Zoning Niap. The proposed development allows for the future construc:ion or" up to 10
dweliing units aiong with associafed plat�mprovements. ,
Densitv — The allowed densihj range in the R-8 zone is a minimum af 5.0 to a maximum ot 8.0 I�
dwe(ling uniis per acre (du/ac) for lots exceeding 0.50-acre in size. Net density is calc�lated after
criticai areas (wettandsicoal mines), pubiic rights-of-way and private streets are deducted from
the gross acreage of the site. After the deduction of 96,469 square fesf from the 217,2Q3 gross
square foot parce! {217,203 gross square `eet — 96,469 square feet tatal deductec4 area =
120,734 net square feeU 2.77 net acres), the proposal would arrive at a net densi#y af 5.77
dwelling units per acre (16 units /2.77 acres = �.77 du/ac). The proposed piat complies with
density requirements for the R-8 zoning designation.
Lat Dimensions — Applicant submitted Exhibit 3 {dated 11/13/03) which was analyzed to
determine compliance with the R-8 zone development standards. The minimum lot width requires
50 feet for interior lots and 60 feet for corner fots and a lot depth of 65 feet. For lots located on the
turning circle of a cul-de-sac the minimum is 35 fest for non-pipestem lots.
Lot widths proposed range from 50 to 63 feet and lot depths are proposed from 90 to 110 reet.
Lots 1, 11 and 14 do not comply �Nith the lot dimension requirements as shown in the initial piai
submitted (Exhibit 3). The applicant provided a revised drawing (Exhibit 4, dated 12/01/�3)
correcting the !ot depth and width of Lots 1 and t 1 to meet the requirements of the R-8 zone.
However, Lot 14 does not mest the required width of 35 feet for a lot located on a cul-de-sac. The
20 foot width as shown on the piat drawing does not appear to be a pipestem for Lflt 13 based on
the line type used. To ensure that these lots meet the lat width standards, staff recommends as a
condition of approval that an updated PMT (an 8 '/z x 11 photo mylar transfer) be submitted prior
to recording that is revised to meet development standards incfuding but not limited to Iet
dimensions. Please see additional discussion under section on "Lots"concerning Lot 11.
Lot sizes would be eQual to or greater than the minimum of 4,500 square feet; the smaliest Ict
wou(c! be 4,500 square feet and the largest would be 6, 271 square feet. The piat wouid create 16
lots and one tract with thz following sizes:
hexrpt Ctie�ieLN.doc
City of,4enton P/B/PW Department Preliminary Report to the Hearing Examiner
CHERIECtiNEPRELIM/NARY?LAT LUA-43-190,ECf P}�
PUBLIC NERRING DATE:FEERUARY 3,2004 Page 8 of 12
Lot Area (square feet Access
1 4,702 ' Welis Ave. S.
2 4,500 Wells Ave. S.
3 4,500 Wells Ave. S.
4 4,637 Wells Ave. S.
_ 5 6,271 Private Easement
6 5,924 Private Easement
7 4,694 Wells Ave. S.
8 5,126 Wells Ave. S.
9 5,413 Wells Ave. S.
10 5,281 Wells Ave. S.
11 5,657 S. 35 St.
12 5,148 S. 35 St.
13 5,500 Private Easement
14 4.792 Private Easement
15 4,784 S. 35 St.
16 5,137 ' S. 35` St. .
Tract A 86,563 N/A
Setbacks —The plat plan includes setback lines for each lot showing potential buiiding enveiopes
within the R-8 zoned parcei. Building setbacks as required by the R-8 zone, including front and
rear yard setbacks of 20 feet, corner side yard setback of 15 feet and interior side yard setbacics
of 5 feet. A front yard setback of 15 feet is allowed for the primary structure and 2� feet for
attached garages whicn access from the front yard street for those streets created after
September 1, 1995. These setbacks would be applicable for this subject plat as all public roads
would be newly constructed.
Lot 1 is a corner lot. To ensure a consisteni front yard setbacic along new Wells Ave. South, staff
recommends as a condition of approval that the front yard of Lot 1 face Wells Ave. South along
its north property line (having the attached garage accessed from the north) and the west
property line be the side yard along a street.
As discussed in the ERC report, the gefltechnical consuftant recommended a mitigating measure
that the structures be setback a minimum of 15 feet from the high coal mine hazard boundary.
This would potentially afFect tots 14, 15 and 16. The ERC placed this mitigation measure on the
project and will be noted on the final plat myiar.
Buildinq Standards —The R-8 zone permits one singie famify residential structure per lot. Each of
the proposed lots would support the construction of one detached unit. Accessory structures are
permitted at a maximum number of two per lot at 720 square feet each, or one per lot at 1,000
square feet in size. Accessory structures are permitted onl� when associated with a primary
structure located on the same parcet.
Building height in the R-8 zone is limited to two staries and 30 feet for primary structures and 15
feet for detached accessory structures. For lots greater than 5,000 square feet in size, the
maximum building coverage is 35% or 2,500 square ieet, whichever is greater. The proposal's
comQliance with these buildir.g standards would be verified prior to the issuance of individual
building permits.
(c) Compliance with Subdivision Regulations.
Lot Arranqement: Side !ot lines are to be at right angles fo sfreef lines, and each /ot must have
access to a public street or road_ Access may be by private access easement per the
requirements of the Street lmprovement Ordinance.
hexrpt_CherieLV.doc
City of Renton P/8/PW Department Preliminary Report to the N,earing Examiher
CNERIE LANE PRELIMINARY PLAT LUA-03-110,E�F, PP
PUBL/C HEARING DATE:F�BRUARY 3,2004 Page 9 oi 12
The side iot lines of the proposed lots are generaily at right angles to street lines. All lots would
have direct frontage to public roadways or access via private easements. As proposed, alt lots
generally comply with arrangement and access requirements of the Subdivrsion Regulaticns.
Lofs: The size, shape and orientation of lofs shall meef the minimum area and width
requirements of the applicable zoning classifrcation and shall be appropriate ror the type of
developmenf and use contemplated.
Each of the proposed lots generally satisries the minimum lot area and dimension requirements of
the R-8 zone. However, staff has concems about the location of Lot 11.
On the original plat drawing submitted, Lot 11 (ses Exhibit 3) did not meet the required lot depth
and was located separately from the other lots. Staff discussed this with the applicant suggesting
that Lot 11 should either be relocated or removed from the plat. The applicant prepared a revised
lot layout, (see Exhibit 4)providing Lot 11 with the required lot dimensions of the R-8 zone but the
location of Lot 11 remained surrounded by Tract A (wetland creation/enhancement/buffer area).
The revised plat layout changes the orientation of Lot 11 but it further intrudes into the wetland
buffer and creation areas.
Furthermore, the location of Lot 11 does not relate to the othe� lots as it is isolated. The inclusion
of Lot 11 is not appropriate to this proposed development, a plat containing several critical areas.
Staff acicnowiedges that the site is impacted by the presence of the high coal mine hazard area
and the wetlands which limit the amount of developable land but are adequaiely mitigated.
Nowever, staif believes that the subdivision is not benefite� by the inclusion �f one additiona! !ot
at the proposed location.
Staff recommends as a condition of approval that the appiicant revise the plat to either relocate
Lot 11 within the plat at a location that would not intrude further into the wetland
bufferlcreation/enhancement areas or be removed from the plat, leaving 15 lots. If the applicant
� removes Lot 11 from the plat, the remaining 15 lots on the 2.77 net acre site would �e 5.42 dulac
��ensity and would be in compliance with the R-8 density range.
The plat plan does include setback lines for each lot showing potential building envelopes and
�,vhen considering the required setbac4cs, as well as access points for each lot, the proposed lots
appear to have sufficient building area for the development of detached single family homes.
%�roperfy Corners at Intersecfions: Al! lot comers at intersecfions of dedicafed public rights-of-
�Nay, except a/leys, shall have minimum radius of 15 feet.
Tne proposed subdivision would create Lot 1 to be locatecf at the intersection of public rights-of-
,vay. The proposed radius for this lot would meet code.
,'c) Reasonableness of Proposed Boundarres
Access and Street Improvements: Access ta the site is proposed via new public rights-of-way,
South 35 St_ (half street improvements) extending west from the proposed southerly extension
of �Neils Avenue South. Private access easements (shared driveways) are proposed to serve
Lots 13 and 14 and Lots 5 and 6.
In order to ensure that Lot 6 utilizes the same driveway as Lot 5 and Lot 13 with Lot 14, staff will
recommend as a condition of approval that these lots share their respective driveway. The plat
plan does not label these access easements. Both access easements must be 20 feet wide with
12 feet of pavement. The access easement for Lots 5 and 6 is not drawn with the required width
of 20 feet, it is drawn with a 15 foot width. The access easement must be clearly identified with
the required widths on the finai pEat.
iVew South 35`n St. would be constructed to the standards for half street improvements with a 35
foot right-of-way and �Nith 28 feet of pavement and a sidewalk on the development side of the
street. Wells Avenue South would be extended from its current terminus near S. 34�' St. to the
scutheriy property line to align with the future construction of same streef within the Cedar
�,venue Plat with dedicaiion of 42 feet right-of-way and 32 feet of pavement. In short, the
extersion of�1�lells .�ve. South �-�ust not cr�iy be `rom ,he ncrth :o the scuth Froperty line, but :he
hexret CherieL�.dac
C;ty of Renton P/B/PW Depariment Preliminary Report fo fhe Hearing Eram,iner
CHERIE LANE PRELtMINARY PLAT LUA-03-11Q ECF, PP
PUBLIC HEARING DA i�':FEBRUARY 3,2004 Page 10 oi 12
roads within the plats of Cedar Avenue and Sunnybrook (LUA 01-127), located to the south,
must be canstructed to provide for emergency access to serve the Cherie Lane plat. The ERC
imposed a mitigation measure requiring the necessary means of access are provided to serve
the development.
A small portion of the plat property, lying northwesterly of the stree# right-of-way of South 35'" St.
by the cul-de-sac, is not identified as a separate tract_ Staff recommends as a condition of
approval that this area/tract become part of the street right of way dedication.
- Staff recommends the establishment of a homeowner's association or maintenance agreement
for afl common improvements, incfuding but not limited to: utility and access easements, rights-of-
way, stormwater facilities and wetland and buffer tracts, as a condition of preiiminary plat
approval.
Topoqraph� The site gently slopes upward to the east at one to two percent grade in the west
portion of the property that increases to a five percent grade to the east. T�e property is located
in an area designated as containing coal mine hazards based on the City's Critical Areas maps.
The property is forested with conifers (cedar) and deciduous (cottonwood, cherry, wi(low and
alder) trees with a dense understory of brush. Clearing limits are identified on the submitte� pians
and indicate avoidance of sensitive areas, inciuding the high coal mine hazard area and the
wetlands except for that portion where the new roads would be constructed.
According to the geotechnical report submitted with the formal application, the ground surface is
wet and spongy in the central and west portions of the site where wetlands are located. The site
contains a 6-foot deep open ditch that crosses the east-central portion of#he property from north ,
to south. Additionally, several closed depressions measuring 10 to 15 feet wide and 5 to 8 feet
deep were observed in the southwest corner of the property where an abandoned coai mine is
known to exist.
The applicant submitted a Coal Mine Assessment and a Geotechnical Evaluation Report as
prepared by Icicle Creek Engineers, Inc.. The coal mine hazard assessment indicated that
under}ying the property is one abandoned coal mine and one "ProspecY'. The coal mine named
the"J & J Mine" and the unnamed"ProspecY'were active in the 1930's. The J &J Mine was small
and all of the underground workings were less than 100 feet below the ground surface. Several ,
sinkholes were observed in the High Coal Mine Hazard area.
The ERC piaced severai mitigation measures on the project incfuding: the filling all sinkholes ,
located on the site with compacted soils; prot�ibiting the placernent of any structures, storm water ;
detention facilities, roads or utilities within the designated high hazard areas; restricting the use of ',
mine rock fill containing more than 20% coal by weight as structural fill; and placing ali struciures �
a minimum of 15 feet from the High Coal Mine Hazard area boundary.
Wetlands - The appficant submitted a Wetland Deiineation report prepared by AlderNW. Two
wetlands were found on the subject site and were delineated. Wetland A is located in the central
portion of the site and has an area of 96,340 sq. ft. Wetland B is located near the southwest '�,
corner of the site and is 1,204 sq. ft. and within the area designated as a hign coal mine hazard. '
The propased development will impact Wetland A due primarily ta the construction of Wells Ave. '
Soufh. The combined impact of filling the wetland (2,766 sq. ft.) and reduced buffecs (1,880 sq.
ft.} total 4,646 sq. ft. of impact. Tract A is proposed to include the wetland, buffer, fill,
enhancement and creation. The project has been designed to provide the minimum 25 foot buffer
width. In areas where the buffer is less than 25 feet, the affected wetland is being treated as fill
and is included in the calculations for mitigation. Due to the constraint of road aiignment, the
applicant indicated that no alternative was deemed feasible to reduce wetland impacts. ,
Approximately 7,223 sq. ft. of area within the 25 foot wetland buffer would be impacted by road ',
construction. Tract A would include 9,024 sq. ft. of upland area beyond the 25 foot buifer as �
compensation for the impacted buffer.
For impacts to the larger Category 3 wetland, mitigation proposed wouid inciude both creation at
a ratio ar 1:1 and enhancement at a ratio of 1:1. The applicant has complied with ihe wetland
hexrot CherieW.dcc
City of Renfon P/B/PW Departmenf Preliminary Report fo the Hearing c�aminer
CHE,RIE L,4NE PREilMINARY PLAT LUA-03-110, ECF �P
PUBLlC NEARlNG t7ATE.�FEBRUARY 3,2004 Page 11 of 12
regu�ations for mitigating impacts to the two on-si#e wetlands. The ERC placed severai miiigation
measures on the project inciuding silt fencing, permanent fencing and signage and designating a
native growth protection area.
Relationship to Existinq Uses: The subject site is undeveloped, but co�tains wetlands and an
abandoned coal mine. Tne surrounding area includes single famiiy residences developed under
the R-8 and R-1� zoning desig�ations. Two new subdivisions are proposed to the south of fhe
subject plat, Cedar Avenue P1at and Sunnybrook Plat. Both plats have been approved and are
cuRently under either civil or final plat review. The proposed plat its in with the surrounding uses,
- both existing and proposed.
(e) Availabilify and lmpacf on Public Services(Timeliness)
Police and Fire: Police and Fire Prevention staff indicate that sufficient resources exist to furnish
services to the proposed devefopment, subject to the condition that the appiicant provide Code
required improvements and fees. The Environmental Review Committee imposed a Fire
Mitigation Fee in order to mitigate the projecYs potential impacts to emergency services.
Recreation: The proposai does nat provide on-site recreation areas for future residents of the
proposed plat. There are no existing recreational facilities in the immediate vicinity of the subject
property and it is anticipated that the proposed development would genera#e additional users of
existing City park and recreational faciiities and programs. As required by the Environmental
Review Committee, a Parks 141itigation Fse will be required prior to the recording of the finai plat.
Schao/s: The site is iocated within the boundaries of the Rentan School District No. 403. Based
on the student generation factor, the proposed plat woufd potentiaily resuft in five (5) additional
students (0.44 x 16 = 5.28). The sciiools would include: Talbot Hill Elementary, Nefson lVliddle
School and Hazen High School.
Storm/Surface Wafer. The applicant has submitted a Preliminary Storm Drainage Repart
prepared by Core Design, Inc.. On-site generated runoff would be directed to a combination
detention/wet vault located within the cui-de-sac at the west end of new S. 35th Streei. All
drainage discharging ;rom the vault would be piped approximately 100 feet to the west of the site
before emptying into an existing conveyance system. From there, runoff would continue going
west for 113rd mile before entering ti�e Panther Creek Wetiands.
The conceptual drainage plan includes detention and water quality treatment for the plat,
including future houses, driveways and roadway improvements. The drainage plan and report
states that it is designed per the 1998 King County Surface Water Drainage Manua! (KCSWDNI)
Level 2 Flow Control. In order to ensure that the project is designed according to this manual and
because the manual is not adopied by the City of Renton code, the ERC required the applicant to
comply with the 1998 KCSWDM Level 2 Flow Control as a SEPA conditior�.
Water and Sanitary Sewer Utilities:
The proposed plat is located in the City of Renton Water Service Area. There is an existing 12"
City of Rentan watermain in Wells Ave. South capable of delivering about 2,600 gpm. The
applicant is required ta install water service to serve this development. Installation would require
the follawing:
� A new 12-inch water main within the roadways in the plat, with a connection to an
existing 12-inch water line in Wells Ave S. on the north side of the plat, and a connection
to a proposed 8-inch water line on the south side of the plat.
a A 12-inch pressure reducing station is required to connect the 490 zone (12-inch) water
line to the 350 zone (8-+nch) water line. Individua! pressure reducing valves wifl also be
required if the pressure at the water meters is above SQ psi per Uniform Plumbing Code.
� New fire hydran#s and domestic�rvater ser�9ce stubs accarding to City of Renton codes
and standards.
This project site is not served by the City of Renton sanitary sewer system. Tne applicant should
contact the Soos Creek Sanitary Sewer District for availability, fees, plan review and permits.
�c t ri LN.doc I
he.rp_Che e
City of Renton P,�B/P�N Department Preliminary.Report to the Hearing Examiner
CNERIE LAlVE PRELlMlNARY PLAT L UA-03-110, EC� PP
PUBLIC NEARING DATE.'FEBRUARY 3,2004 Page 12 oi 12
Although the Soos Creek District will have the final revie�N and approval the City still needs to
see the sewer on the engineering design pians. Staff recommends as a condition of approval
that the applicant be required to obtain a Certificate of Sewer Avaifability from Soos Creek Water
and Sewer District prior to the issuance of a utility construction permit.
�l. RECOMMEfVDAT101V:
_ Staff recommends approval of the Cherie Lane Preliminary Plat, Project File No. LUA-03-110, ECF, PP
subject to the following conditions:
1. The applicant shall submit a revised PfviT (8 '/z x 11 reduction) of the plat that complies with the
development standards. The revised PMT shall be submitted prior to the recording of the final plat to
the Development Service Division.
2. The applicant shall indicate on the face of the final plat the orientation of the front yard and side yard
along a street for Lot 1 with the front yard facing the north property line (having the attached garage
accessed from the north) and the west property line be the side yard aiong a street. The satisfaction
of this requirement is subject to the review and approval of Development Services Divisian prior to the
recording of the final plat.
3. The applicant shall revise the plat to either a) relocate Lot 11 to make is relate to :he remaining lots
and not intrude in the wetland creation/enhancement area; or b) remove Lot 11 from the subdivision.
The satisfaction of this requirement is subject to the review and approval of Development Services
Division prior to the recording of the frnal plat.
4. The following lots are required to utilize their respecfive access easement: a) Lots 5 and 6; and b)
Lots 13 and 14. This condition shalf be placed on the face of the finai plat. �
5. The portion of the plat property, lying northwesterly of the street right-of-way for South 35`h Street '
abutting the cul-de-sac, shall become part of the street right-of- way dedication. The satisfactian of
this requirement is subject to ihe review and approval of Development Services Division. �
6. A homeowner's association or maintenance agreement shall be created concurrently with the
reeording of the final piat in order to establish maintenanc� responsibilities for all shared
improvements. A draft af the document(s), if necessary, shall be submitted to the City af Renton '
Development Services Division for review and approva! by the City Attorney and Property Seriices
section prior to recording of the final piat.
7. The applicant shall obtain a Certificate of Sewer Availability from Soos Creek Water and Sewer
District. The certificate shall be submitted to the City of Renton Development Services Division prior
to the issuanc2 of a utility construction permit.
EX�IRATiON PERIODS:
Preliminary P1ats (PP): Five(5) years from final approval (signature) date.
I, I
i
i
hexrpt_CherieLN.doc
__
��:• - ----- -- ---
— - � . _ � ._ .
. ,eoi r _ :.�. . �— -- .,, I � .Y — ,m— " ��., . _. _ —T-..,... �N"ieqo -�-- ---- --_..
,-^P ..� ,c •3�1 7nY, •Hia��am��. ,.ti4 .. . � _ ... mc,�m:��;�i-xa�,��xc,ad,—fn nc�^�C: -'---�-- a�:3av�xc�-_c.-ras; �_.�:-..... ..
♦ , .. p .
,, �
[N� � ' � � : ry¢7 6 � s � ! � � [a] � \I A .r �'�� �� �. l!'If������' .} � - .....
.,rn .
. , '
'f,'�_ ' � � "' ��f�,. t� i
�nnt2t m�a� . +u
i _
•••SIL.�W31f10H� fl
. ;�, _. L.�'.�'� _� _ _�LA7 t l' ! . _ p�!i __ ' .___—__—__
'F;� a �' (e ' L.i � � � ;\\ e. ,� * �^�1� ."'�'W1't � ..
� �a i m � � � s 8 ea �s: � � r Jy�.�ee+!� ' �. I
`"'. `�-- - "T ertf � \� i a� � _'Jf, n ae � �� 9'D ����;r�en�f� � - � � �
T9 �- .� . .`� , a � � � � m ---—- � > us°�,'ar,9�1�� � � 8 .�
- �.� ,�m����� �' o d;- � � � � ° ; � " K ; ; � ��y� �,� � � � rTl � �' '�
• � �� ��e �in• x oi � � � � � � ,�E+� '� ' � . ' � I I: Y1 N�� �� romT,�cf.�� Q w � � �j� �
� � j� i � 9 i.a�m `� '�� �, �
,(1 �,--}� � ' � � t �,��'� �,m• ^ � i W'd�1�� 1 `£�-:ut�� � � �i �"'."�. "'i.
;; ;- -- - - �- - --- ---�--- - ----- •- --_- � --- ---�- �, • �� ., o � o�: ��e,� '�- �"`� � � �
i r��,�,�,.� --- �� �� m � . l: a� � � �- ,�„�,��; � �;�
� 'p� � 3. � • >� • w �+ � � � , �� M���� � Wh-y �
���/IL�•�r` �, �� � �� dJ � � ,7' +1 ' �'-' o �A oy � ! � � I'.'�°je�4�'��` �`���'`� (Yj -
,` - -. i
��y.. ,� a y L'�" _„ -�- - - --�-� '�.� �' ; . ;;•�"�_ _.hi --
_� . tl -r �,` , ��. � _ � ���.;.� ��� 1� � �
r,� � �m � � � tl ....�......�.. r + .A1 �'-- ��� � Ai
; � � * �,..--s t�� _�_-� �m �� •�:� �, I ��
, ,
.
�,".'�',�. e . y� -�
.
�; a�e t : . . � , -- '"� � ..------- -- I ,n '.�1
- I��. , � f• ,� Y,}A '�m yW p� �� byM1, � i wfr'"� � U �p
�1. ' ' L _�q ' '� � m ao ^ i /� 9 CI�7 �'� . I I � �y�
� I r � �eryn� � i � �, � i 7)'i l
(��,�� � T`� � A i i..1�'I' ' 1 OY ' � '� � � l)
�� . p � ♦ � . 7A tlt01 �� : I ' � �Y
�IJ✓,CJ ,�. " � � , '� ./ / � i � 1 ' ' � ,�d ;s- �ef-�t��Ir. .
�, 3� - �� ', . 4 ," � � ;; � ' � �I I � � � � � Il �
�` � IVYI a � ; : . I i ������W{,_��:.
,"'`��'�` %' ,�- 9 . � • �v i . G ' i a�'�`� i w�� � � - , i� �' ' _,�1_ a �. ..
� � .� �iT , . �dII4
.���29=' �' :. . ,� , � a� J ,�� - ' i I . � - , �. ;
E` "" p �J' " ;' , = g a �il �O' i I I ��'?n
p � N tp I / . ¢ � . �' ����1
��,`�" B � H � 9 � �� � j .� . ` ��,�', i i I �t
yn ■ � I d s 'N I . ��I
:. ,`'; ,� � � A n p �, � • _ � I �� l � . ' �� '� .
� n � � � � o , !� l �n I � �
R-�.f " G _ R ,, e� , . sr. , 1'I � x i g1�
��. " s• � �' �J� • � � � Y � C:_ � � Ni . . Ic_I
'� � �:g *� ��,'" L..' ` _.i, . '� ���� 9m I i � J; ' � i � � i� p�p �tp .�!`
i�- 1'��.�M� !�"� a : �' I__.c._._�� J. �_ mn. .—qpF..—. .. _ —��.-� � _�:�,�.�.,�. �i ;S„`Tfl 1R�/..w... '
. ,Yo p; d �! � : �� . v a�� - , .._ -li tl� �� �.; _, s , � �.�c� j�, � _ .y�� ��;�
r �'�I � • � � ' � e a��.�", �!T !} � � "M]
�� � t�x� R s � �s � �.o . � ���:J'.�.1.� ip � ^
� >,�v,°P�EI �� � _" i . � V, f � ,M�,\ I
4 `,-� i ^ •• �t � 1�r � � s �• � � P a • '� .���--o� 1 �+ � _•• `�.
�„�'�� �;1 ,rt, � �- _ �.t " i o a . �� �j^ • s. " � A ^�'-�l� I
�'�. I . �" * ^ q � ' e � x I �° � (� AV� � J
' (Rt . �n . n f S, � , 5 ���'� w HL86 A�'^ • � 0� � � � Nj I
��`'lt� � ����'?�7".� �� M p �, ',�; fl �f q1�) e�� 14 "`�,�,�. , � p � '�,:� 0 9 W M�, "! '�A" i � i B� d'"" Q ± t(� � �I
� � ,,,, ,� � � N A ' e � e... _.e i , i � 9 ����[��� �
�� ,'���.� '� ' $ - " � � 'i�en ' C�'' /'a.
�•. .y � Ro4`? gt •r �s` � 3�]j�J g N e� o °��- loeiv.� " a- z ' ^_- i .^�) �`�, ( I
�S�`„ ,..... ` }* 1 a /�� � /r� . 4 � � Lp '.� � e e. .\\\# � � �� �� �
�,� � . � � ��,� mI„I ,�� t�, t;' � a a ' 1�,r`�, „ 1• m. •-• • � �a �1 � ��.
� T> � iA. . _�' ` .� � I� t,� 9'�" �°� UH e �.` � � e � � � '� ',. .� '1' II�,�
-� �+ I "��
d, � �—�--�' !. �� �l : ,�.!� B 3 �},cti� � �� �- i�� i
in�oor��l ��+nD, i e f � e �, Ib ' �fD .. L7 � �: ,`b �
- - �� J.�, �� 9�. -� ��« --- m .'� � m f� �� �' • �ql"' }1 =�.��;"i{u1i�� oalet� � �3 �`3 1�3 IIF � -- ��'�
� '� *��, e t + '��,�` 9 �` c 1�
�� m - •� w .p m � ^,� (j] �I�I 1 :� i I%:I
•, �i �% R � �.,._..:
'n � = 9 � { ' i ' . G W�W I.. /'� � O Z ��J ' � �l � .� v� ' y I� ^i��
$D ti�� �� , � ,».� .. � % , ' n 3 '1�
,. , �o ; i a �o ��_ �;, , � � - � r(;;.�, — r\. , � �m :^., ,:
� ' ' W � . 3 . r�
� a �, �, r �� 1J i � e
.
i _ '' . '(ir^n i , • / j'• �d a
,.... _. �
�_�-n^^.*'_�•��, .. ..,, . , ,. � rt ��,. a� �� ��/S,�:�� I...
. ....., r n.
.,��
..,�'I
MI
v
._. .,.q�-^�".l_...- �.-..., .__. . ._.J-.m n�,�,�n:.,.awa..,.,,m ... � `' ....,��...5 ��r.e � . T_""^^� > ,-' n1�L-_�"NL'9 ...' q�� ��H� .�. ,a,^�W
,/
y , .
.. .. 9
-��- �,^.:.�� _,.... . �_. �... . ...._ .n_...�'"^'^'� ....w'�,!_�..r �',. �_. i
NW� -0,SW 4 SE4 19 IYVP.23 N.,HGE 5 E,W.M.
__ _ 1 _
I jp + �` \ . ... �
,
. .� �.. � �� • �.. � �:.�� -� a4in ST D �1 R AFPLIGANT
� I ��: . . . �..'. � . 'i.. . w t� ' �_ p' ''_ " rc,u.nwusi � smw�neac .
I '
. i .. . a . �..ur n v.ni ro a�t.imrw�n�cer
� . . ._.�.., .n..: .._":._:.. .-�. . Fr... . � - � ���e�d.�nu�. waoN..uaeoe�
� - . . �� �T �, � ___ .._... .. I . ai c.uroiwu ww
' IiiR � i4 if . ' .
-ir'
� � �•��-. , � � ���1 � � � � PLANNER/Et�jINEER/SURYE70R
.... . •., ., _ ' . � � � I - �[C.t•�i• . cauw�awnc. y�'' �
.. . . : � ' ' � ",i •..._�.. ��..: . .. ■.LML T W1TM Y001
. �� - � . _. � . . i o iwe- iI��F�el_I
. � ... .. . '� i ca+r.cr.i.w e.w.uww..i�+u.
" -,p, N I o.�no�urr .t-ac�R )I .
- �� ,+- � .� •. "_-. Kl�.w .YIG�IVu00lrL.NNrii4M 4 �:•���
.. / .�it� 1 �1 ', 4 � i
_ _ � _�,.�.•; .. � . � i�^� ��.* �I�'uw I �'(�� •- � i
...
� .. w' _._ � .' ' -s�� ._... _._. � nl`a es�iv�"u.u��e n�ie�ia liw�r�auwaR a�w�eur�ua�r
., --� - . - `�
- �•-- � � f' i ��` r l " '� I $CALE' 1�� s S� .�i1°"'e.iwr°kr"u�.`"w��.u:o"'i.�wi�u worrtu.R4na�a.wr.un.
, �' .:,.. � 11 � i_i_ :_i� T � � - e � 'l�� � � t__�_�—P ....rr.,.K y�..00ry,,.�w a�� _
�' '5... t J � � ��'�'��r�l ��
� ' , �pr
' „�,. ;- � �� ��..,,�� ; ,, , � � t
,..� _._>- , , � � ; r� � �. � ,, , �
� , , � f., �� � , � � _ . .
w � ,i . � �, � � @ENGHMARKS: Y � ��
� �,. m .. , y . �•e�as�w�c N�weuux.na�u corww E� '
....e.COw`w.�.. " � � �� � �i -/ �r�',y� ., � •<. :r r ` .I �_-_' K�v.no ioo i�,n�r.Klraea.�nr•�� z
�t�J �.___J _._.l �_ W�j,�'��� /A Y� I� ��� 1.. s .. /�-___"_.___ , � _
i
�. ii /
� .•- y�+11��.... � �' I _ . .. . . u�"'�1 c11Y w wlral.wrD�W
� 1
� • __ .... ,
� wwr. +M � � , /' ��� � DF1.T
" ���ti ( ' � �r ' pASlB OF�EARINGB -
i �� '
f,;\ : � '�� � � t w.�o�rz..�an n�.wry tw �Q
i.. �_- .'•�` _ ;'., .�. \ :`:.�: . I�'�.i i��_-i i��._i i' .i t� '_- ' � :`p{ . t� . � iaweae°orw.ir�ww�'nuM� � z
� _':u.r � °��r �\•��� � y� y� � I � i � � ivri ���..-* .- /I� .. i , I . t,.� rYl�t
/ I/ �,�ly� "i i� i i i i �i �y Y .I .
t-�_i�---��s--� � i � i �1 I r .
�
� � „
-- �' � � .� /� �", . • _ �--� �'-FT�-- "-
�
.
�"'� � � � --- - - ' -"t� - --�
..— - - - � -�-�-- -,�-T. __ _ .. j I��
� - --� , r- � �
-"------^-----' • �
41
-- --- - - ; ------- —� 1 i i9 � ,—u��i ioi�r.swii ��� � �/ � ,
-- ---- ' '
-------- 2e � i i ... - 81TE 6TATI8TIC8
' �� a--- --- ' � � vKA�r`e � � !�;
—�I' B i . �y ��eeu�ii�p ����. � � I i/ A0, I � i� �tmnc.�u, wui.r �
G
� . - i. � i 3U 3��.. w!u, � \ �<< �� 4�. �e�-.•.�a..a...�..�... � W Z
TkGf.T F. '-2�i I� � � `�"-...:� •r �• .\ ` �,l. roru.w�i uu.. anrm.�r.a....i�csau
� I �. � . �. � . .,..+ �I� -�-;-'�' - , i i �i ��t�. . . n.o.o..o u... wr.�..w-...a�...�«�. � � ..n��' ,
}i^ lm4 O
� � � I - .)1 . 1 I ' '1'� •� �"� \ /� � Q Z� 'i
. ��I � - . �[F 1 I � i . . . . 1� II � '�� '-�b�3A� . �i � �..1� �watl�LOTOii�. �YlN. /,�/_7 � \ ZN� �
�MW�OO6INR� ! OWn4 � L � v111 ��4 i
�'i�'°�"Ft t .J �R 0 il . I� nw.mo owrtr� .vw:�:� `� J l a � W� �
�� ���- y �� �{� �� .`��;,: �, �, �.,��. . � i :�=� ?� � �
�. ��-. � r'�rJ.a ��� �� '� H k .p..l - .0 niu.�r. v � �`�
',�' �.I� tf�j f��u�'ji � , aa�,�I ��T WETLAND IMPAGT LEGEND _ .�.��.,..�....w, �,�.... �� �
� + ' �i �'a�° y r .���..e. �,«�... /� �w�
���I t' J.{.J.I � ��� ��t 11 £, L�.�mR�r.er �vuu. urrty+o• uo�.�. � V
..,i . . _._ `I.t� � � � '__ _ __ _
� /r 5 ,;,']� .� . 0.�.,��,.� ,�,... ��.�...� ......... a
'`I�s� ��)�' .w `I I F � IMGt'�'•[#iMdGt MI�I��I.
u��� '� ' / ���f�i:r Y ,_�... � (�•.�..��, ,,.o...
.._..t.:, �"
�: .� -`-'� ;
-1 {_ � -� � ����� ��� �;�-1` O rnr+oru ax,u.
._ ��� I� I .. _ �� �l '� .� _ �...Mr ___
,��\� MRMV 4iI�W1 IKCW.
`' r�°�r r�p�l. ', ` ._ - . �Ii� � ua � �' DEN8ITY CALCUL4TION8 y
�y,� u�f� � � i��� ��y� I � a
�yV,�� �'rl�llrl, �'� , . �r�p'TS,�.�,i.rri: � k �Yexrou.u��un uun. aw�Nen'�i�c�a-rnonw�r� ��w•M���.�.w�i �',
1', :,IlIIY-'� �.�� �......_ .. .'�. ,�� .�:%��; ,'�•'��,�,' � 'ui°Nx..ocaxi""� nio.�r ��
�t I, I `� \'
� ... � c.� '� _ __ ro!��R�w[.� 4o.u��r wa�.ii.c+rcs �:,
;����2�p�l� � �� ..�n� �,�;�(`II L 1� �--d:�-.:� r o..�o�~ •.,,�..�a � �� 4�
�....�i:� ! A. i, .:..�. ,.� VICI Y MAP g � 4 ¢ d
�i___-�
�e�a.W.,.,,,�..>..�......,.,,o.....�,.,�,.,�. � �o s
- --!�=----"-�'l ,:� -„l: .,_:'� - �-���—
N�IGNpORIJOOp pE741L I9AP
� ...ea. srci
i 1
-----���,-
�03i�D0
�
.- � � �
. R'�,
. '
� .. 4�,�"� b!�,�(,/� `,�-M1 � -- _
'�� ��.
- • • . . ; . . .. ___. . . . _.. .:=�r
, .
i• . ,• ,.._._ :, _ , _. _ _
. �
. �, , ! . ��
I � .
- ��. � .
,' ..
_ i - ���� • �
, .,� ,. ..� �
�� � � �
. _ �.�.� - �� �lI
`� � �;.•
� - �r��,
�►► �,. .
� ,,r �� -
� � �n _ - - �� �►Y'��
� - .�► ( ,� .
� � �.
� � �
� 1 ��1►1.��►. � �
I� ,'�i�►���'�� �'��� `��I � - '
� �, � ���.��•'�� �
� . � �� . _
. � ,�.� . . ._ , � _ __: _ _ � .
�► ��`` � � �;�i�� � '� - =�Y -
� � �� � ` � ��� .w � �r �-- ..
9 �i �, �/ .,+.��-.-�.�. :�1, -�• � � / .
�., ..�� . .,�, , �. : -� �
� � � '���. , �, . _, � .,._ � � .
,��_ ��,/ �i���.. �� � '.•'.���- •.'
�� ,, _ _�1��-, � � 1
� � � �� � � .., .L
� ►� . _ �.G.�1 � ,� � _ �
- ,.:- -, ��� ;- �` ► , ;�. ,� . ._ � �-_
� �r� ��.� . , � >, - -_
. �a � -�- . . . _ _ : .
��� f .
a . _ ,:,
� . . .,,. ..
, _ ....-------.-- W � Y
' � ��l .i 1 - - . . . ,
�� � / %- � , -��
� , .. . � - .: : r , . , . , .
�� ,.� �I .. , . : . . , ..
.:� �;.� � . . �,�
'�' :,�r,,�• ���� ��/�. � _ ,� � _�. ' �.' , ,
., , �* �� � � ; .
;� S�l�; ����:��f�/ � ' _ �
�� ^� ��,, ��� �/ ' � ��� w �,.
. .
. ,
, ; �
��I� �f � ` �' � -.,� �1►�
., r .�r �
_
-� ��-- _ . . * .
, , -
. :
� •. _:. . ww��►�c't �. .
► .
. � � ... .-���.� -
,,
. .
� � .:+ ' ",- '' . i
_....._.__.
-.�,5 ....... , �....
_
_ — - - - Al��' z.. � , ,.
I� 1
�1.. � 1 / ,� � .
i�
► � 1 • `
1
�' ♦
. � •
� �
Of,OFO — ._ ,_.
rJ9•�nri�J��ovf ���-
Ft_ __- _..__ _. ... —'_
_.s'a� � lvw��
$�i °
Qg � � �
a
� �
zb c � � r��
��
:LSH198 S �
€3 S 3AV 5773M --
F�
"c lt�nxs+rov 1r xfan,el �
A . . C7L1I10 i IWV irWNH NiYMIn/s 1tlhJAO� tlLIMJ f!M'U ir7tlYN M1vM7d2,1(7YMtl7
a�,. SUNJM]'JIMJn]�'\ IHfnA%TNI.I - L)K1M.1/WM1.�f lnMAYJ�U.
�` --�r-- `•r.
,. JI.,�o .�n--
.,
� ....__�r__.._1 .T .ns .n — �or .
_➢a u� . �„ .� �. ,
t�wr nq�.rwn
� �2 nv..�wsv�rru�
tlr�e�rw M/r Y7nNOl1 N DpOItM.�
� '
N �� � b �W��1 d '�1�
��� ��
R1Q�II�I aHW q pt�aV
Q � I.vl�Niwrronrrc�rrr-ro.ar�»irc
JN t wM1^I w4 snoT'T7i'}R.Cf,mr
c"� �� .
�� ti� �i-3e�sisre � �
� �
i
Uy O � ' t
� '2 �, R� .�..�n,a,..�«..�.,.�,e.,..,,,o,,,�....,.�.M..,e ! ,
Z �� uin°n"�`"rmvwaa�anw�c�w'wart�aaiva�mAn�r�m,.ma,.wwaurxi . i . �
w,�r rma�.er.ra++ro�v roa.r.r��ru�w rrcr�r.a�� S�CZ'6i'�35 i I
�� �:�Wiv�v�M>uw�r�u�rv�Mpnncw�_w�o�q�m lp.� - � //IM:'!/IMi'3N�1 H � I
y plln�ni IAYNKTI/II�11'�v1AIlPNM4^1'[MG'l�MTA'B� � �
�� .*+nti'.�rn�;M J�I N�Fn/WY1wIaI Msu�IavIr1F�!rtLT � �_1.
� iTi�i+T�'in�crit�M iliv I�w M IWhl.�T.�MM�I.�irn��nH( . 1ih411 � '
'.a�
2 2 •����vn o . . J , I \ / _ rs _.. " .
.na�rsa rw.eyrem+� _J `
FCMILMiN1/VIOYDNMIImbI•r0'�lOIOfIHIMJ.IM[�YMiIFT!l --�. '- /
�
laN'l LIO'OGC�C��IT=M111 N Onw7frf�rl OXJiY�b lp 1 xlTWinYatl � .\9
rea ro srrron nrc.rn n wi.r.x�mea.n�rxvuc�su aa�rw� � .. . '� I .....,.__
�o�..�m�eo'"�x sii'���...e��••wr�rw o�oa.m m�w.vr�u n.� ' �
.ncw�_x�a � " .. wnxva�.:uo�w.rco�.u�
I I / .
�rs.M.�n..er.n...,orn�r � c t � � '� � v��+n. �•�
htl!aMQtlar n vAtwJ Mu YeV Y ,.A � e em IiT
1/// OpL�PJA/fIT.ONMa/I0111a'M1t�tu0�/HM%)i�iaCrYIW�A(M _ . . ... R �
;�� M RNI�AY RCYt/GM9lNl.?n[W�aI lY9iO.�N)1�11N II�aYAV1Y/FMn fxu f , • `\ _ \� �
2 � If11M'h�f�l/I.�1MIMYIArm/li(.�]PYJIYM. i � ..._''-_
T iMlM�rrY c��[s�Puxn.c+�
•^
�..�.,�.R..H�..�r,,,,��.�,.�,a�,�..a.,o� ) , � _ _- _ � .�„�I�
� p 1D1MM N4 IYIIPH O(MYYQ�C>R1LY iY.o M.V���'mr.9lWfp�w�axa4'YI . '
n N Mf 111L rtll Or]sb T�J?f).R�/O Ap�]Hi�IMb�lYi!ca'd�nn 1 oa�m'3faY �. ' - _ . �1 ' �__�_
\
/ IMNk�' �,`
� �/ �
� irr��o o➢R+T�II'O GM1Y�lf!IW/.0 MKMJ 8tbY4IMY s'MIO.YY/.l.'W mu3wK . •• .�.'
• G1 � A4�7M�fwNlllV(/.IMaI71f�'1'�`YMlIhl�xt�%t�Y�Icwr3F ' " �_
� X lvI 2.IIr rn mla�-sp?Im'aI MIINRX+J i�v I?u TNb�./PV ` -- " �i LW�� ~���r==__-- �_�
� M�ru�t�✓tlan.vrn�L�'rn��yqas�.o�MY.Mn/a�+vwrrl�v� � � rl/Y'1A?I �� � �•
�� �^^LL m nrbr/Mu�u'.vll4u �}�
� JtllWal�Yn�L/MJ M:�.O IMTJW YdJ�tRM LW LMG�Hle!
Z � ww+r'�»+s�.v'�'iruroxwNas�yrwr.nrriaeaiaosraws � � � -� ci I
� ��_ � k�saraw.��emv+rcv.wwvewri,va'�vs�wur �._Mf n„r.�i�ia�i� ��� •� ;�
� 9)IM
� � e i ,���� r.arw /�`�� ���
� r r,. �`, `.,�
c i� . i�o�r�r�iuue��
��a ' 1 I _�_,'�
� MT��i»+enntAavrutrravi , � I'^__.—'�.—.._�`\ � ,%� y\ _
� " ' ...�`' •'I. ^r'.�'-)��.
(� WfMMNn'�tNn.�M>'Nf+m'JMf1tmLlr�+q+K�1+'r1A'rcV � � I � � 'i �a�+wiir.�irv�.�
vner.omoa�.ano.•murchwu.errtu+nnirrm.aer�n mrr.u+nw� �. � ��. 1
RLY�o��Iv �/p-. � 1 al'"�WCNbIUHVN'�
�'.�. �.� d 1FO.�ImReM'W/=/ _ - _ $ ry \ �_+ i �� i' l iaNMIOI/GWin^t�
1� �11_�PU:JP'T
�y�....� ' � +� ��', y..� _, .
� 4� � ... - - -- - —-� - -— - _ �.,. .�„�„ ,
�,�';�r , —
' �...�p, �07 • �I '3"ib'�3 � � -
- , F .
. . . '�"m' +,rnzow.wm,
. . , ' �: . J' . ,
, _ - �-� G� �
rn -
I � ._ n� �'� -� i
- -- ------ __ �,...� e`�` ;
---------__----- �
3J.'/.l11f.�3.5 ' -_...___'_"
I
�� ' Z� �'23�I � '�T �/2 ��
` - --- -_ R `�` _
, , .
Y
: —__.
� � p a -------� `, �
__._.__ -
f� O R-8 ., �
8 �
� ^\';� RM-I �
.�
RM—I
. :��..-= __ R-8
= -�-��-t�--�t-: :R:�-=�- �:.--
,,R-8-- tl�.� .. �j - ��-� :
�� '.`�,��,' ��1 ' CO-�, R 8
��'� �:,-�-s'�- �J ��, i- -�. S 27th St. ��-------
� � � _ � -- --- -� ` R-s � �� !
' a � �, �
/�.� ���:�� __ � .� �' - '� ���� _ �
�\��, � _-_ -� � e��= $ �# �
�`� �j� R f3 �_ ,� . . � ���---- � �, �
- ��"" cGo - � --�-'- � �
_ �Q �_ ,�_� d �i.- SE 166th 1 ' � � �� �
� ��'�s; -- �' - ,' ��—, � , r�
�, � `` - `�" �,� �" -- ,� ► � # i � �
� ,
� - � '-" � - �� ' _ � �� R:-� �
� - �-$ -� � - { � ' ' � i �
� 3Is� ---;"�� t� i ` f' � �
�t; -- � � � .a -
� : — � ; � �� � i (j � '6�''''
H ____�----__ --��.3�n-� - -,�_ �' _ � � i � I ���.�__ �
� o �,,:; I �a � � � � �w � � �
�, 3�a--Pi � � j �� # E� �
� n - � ` � �
,
-_ � I 1,� € v r��
�"� � - `�:F� � - — f a� � f-+-' � � � 3 i 'x�.
°o�. J' �. � '---� - i� r �� � �� j '' �
St- _. S`�32nd ;`S�. - `-8 y _ � � ,� � �� y
__ _ # _, j � � 4
-- -- �� � � � t C� �i �e
-- ------—R -- -- -- � � �� ��
__ � 34th �t - _ -R-s-- ,'� ; � � , Q �
�" �� -e �� � ' � � .~ � �
_ ---_ � S 3��h ? � ���} � t � t. � � �o�
-- ��' - , 'R-e � '� `��`�E; �172nd S ; SE 172nd
------- '�' � �-
R-10 ~`
_ e � J; �
ji , �
--- -__R-=�0�" ' �`f± i 173rd5
thst R-8 ' � � �
-__-------___— ---
_ ___ ,. ,
_ ,%'�\ � ---`__�—� �
� l` � � � �
-- � f' � �' �
---�-- ,,f.� �
8�h ----------- __- � +,�� � � �
Ct ___� r, , � -,
R—8 R-�o �~ : � ` ' �--'
�`� �-=�-----�-'"�-; �—` — �
; . , i ; [r �
j .' � ,�/�. � � Z f� i
� �f' ./ � , :! �
a'� � �� ��� � � �2
.SY 4 20o aoo ��
+r�+ �.���°3 ----Rcntas (�it7 Limib �
�F��� ��SCSNIC.�1.SHR91C� �j n� 3�, T �+ g�T � !
6i� i�J1� ��r �'! 3/�
�.+
5329
� � �
III. OFF-SITE ANALYSIS
A. UPSTREAM TRIBUTARY AREA
There is no upstream area tributary to tl�e subject site in the existing condition. Potential
sheet flow from the northeast is controlled by the Plat of Winsper, Division II, from the
north by the Stiegman Short Plat, and from the south by the Plat of Cedar Avenue (refer
to the Site Plan in Section n. In the developed condition, however additional
improvements beyond the site boundary will be made to Wells Ave. South. The
impervious area associated with these improvements aze included in the detention
analysis in Section N.
B. BYPA5S AREA
The Cherie Lane Plat will bypass flow in a 12" tight-lined, closed conveyance system
along the eastern and northeastern edge of the property(refer to the Site Plan in Section
n. Originally bypass flow entered the site at the southeast corner and traveled north,
northwest for approximately 370 feet in an open channel before entering an 18" inlet pipe
connected to a 12" storm drain system bound for the Panther Creek Wetlands. '
C. DOWNSTREAM ANALYSIS '
A downstream analysis was performed on November 6, 2003.
Drainage naturally sheet flows across the parcel in the west-southwest direction at 290 - �
1 S%. Westerly runoff continues via sheet flow down a forested slope with heavy '
underbrush for approximately 1,700 feet where it enters a series of catch basins within I�I
Talbot Road South. The small amount of southwesterly runoff on the other hand,
accumulates in an open ditch roughly 750 feet from the southwest point of the property.
The ditch then transports flows due west for 900+/-feet before being intercepted by the
same catch basin system in Talbot Road South. A series of pipes and catch basins along
Talbot Road convey the downstream flow north for 250+/-feet and then west underneath
the road. From here flow e�ts the system and is carried by a small ditch through thick
forest and underbrush to the Panther Creek Wetlands. See the attached Downstream Area
Map. �,'o evidence of erosion or flooding was found.
Core Design,Inc. Cherie Lane Page 5
- ��,ti 7N i�t�f`tl�i, J ' _ �\ \ �� � � ` ' `�•`_ : (LJ" '-'� `-^� �•} n �i ! � ` � It' i - j � ! I !1�i �i�`�I [ " _�Sl j
E �__J_ '�— ,.\ � ,' i � �< i r � J� iirrri
Y-:.ao � �/ t 1�\ � "�wK.:V i \` � � . ' �1 r r � � �% ' f �1
,. �\i�•���\�\�Y�li�,j �'! __ � � `�^ �.. � � � ! �} .� , 1 � `� `� � \ � t i �� \�T 1 1 V t { � ! 1 � � 1 � t �+, � �I t 1,, � . ,
�hi�`�s�J}����it� I � �.-, t � � ,. � .. 7 t � � � < < �`� � � 1 \ � � t t t t � f � � � � 1 t t t 1 }.��1 � I
� �����:�4�1 � . � � : t4+ 1 I ti � \ { /� `�`'=1 1 \ l f � �� � ( { 1 \ \ � � 1 l l � 1 l 11 V, � � �
�1 t��� 1 4 � 1 1 1
. ANTHEF� r�,�, \ r ., _ , , . � ,�„ � , , , , < < � , , , , , , , . ,,� � „ , ..
�+ a�•,�,,:i \ � . . � �_ . , •� t , , ti t , c i i s i � � , ` ��i t , �t i
��� *iis;'i�';�ti ���' rr n�i � f/ � e::,, �.�l' i � . i �� � � \ ;s��-� � � i � r ' � � �. c ��`� \�� � t ` i i s t �� � ��i� x
Ci3�EK �� ��.��, j � .> >� � , , , , � , , , , � , , ,, , � ;� ; ` , � ,� •., . ' . `', , �, ', , - ' , � � . , �� � �,� , i �� � ;� , ,;,
t ��� \ �. r t 1 � � � � I r f � 1 4 \ ��y��
tl+� . '��,� 71�417f I � f� / % ! I � f � �� � � ♦ 1 � � i i 1 I � � y 1. � i I � it t� 11 1f1�1�
S !(!r''O' \ � ` \t l� IJ! � � / � ! t 1 i � � S � { 1 1 / {
l �� � � f 1 1 1 1 1 I �
v t � - � � ! � L t � ♦ . � a \ ; i t 7 I S � � f� � \
�j�i1,l,�'r � i \t�t����♦ ���� l7 � f !! ` / ti t � 1 ,�\ �� �l i 1 I I { t I 1 j I t1 t tj � �I` t �- -
�VETL.�A - , , z � , . , , , 65.:., ., , � � , � , ,
''_ —� �/'ri� ,!�y I � . � �� y��♦ � f i/i111 j �'I 1 � � t x � � \ \ � `1�� �����, �' -` , 1\ `t �l '� I � ' 1 � � � � t"1 1 / ' ` ` ,
� ! �i�i��i �\\ �..�� � (! �t � / :.�u\ � � I ! 1 \! 2 < < f 1
.1 ,ur� r 4 j ( l� L1..�, � t t� s � � � � � � � � � �� � � � i
� " � ^�i y��lFffjf��'' j� \ •� � i � f�l� �li � i � �\ � S 1 { t � j! �7
�j/ t 7l � i /7) 1 /
i� 1, �"I l�l���: ` �t � � � !i ! �l "d' � 1 1 � � 1 f 1 � � l \ \ i � �t � r � � �� ^ �
L � /`� �h l i� t f i � � 1 l l � { �7 1 \ �� l t 1 4 ! 1� }.T.
j iii����Nk1P�l�'l��t;� '•i. �� ♦ L 5 � � � \ \ � � � 1 � t> > t 7 � � ! F � �
�� i��� Tl�vti �1� - l l � �_ � � � ���� ♦ � � i I
�� �-` �� ��i`��k����� . � \ ,� �� �� �'t ;�`�.� � `��� �� ti� � j 1 'I � i � 1 1 � / �� f� 1 t \
i� �f4 � 1 ♦ 1 � � �
`i� t j) �"-�i/ \� 1 X I 4� \ �� \ \` � \ 1 � � 1 4 1 f I � 1 � �� � �
� i� h� )l��`�_��i' 1 � r - _ ! � � . 1 1 � � 1 1 1 � � f 1 � �/�//j I� � J t
/ i ='y'��14;Uu iii'r�l 3� v - - _ - -- st 1 � 1 ! ! f I 1
i ( k��tr��i r li - \ r � t 1 / !J/ r �
/i%=�t=^1V Je;�l I � . t f I � f i 1 E f ! 1 1 // � � I t` .�
�i ;a�ry��;;,y .�.a�i���')�i�� i c�� t � � � r .� i r� : x � � � r � F t i t � i � � � i i � � � , r�f� i � r � �,.
-_ ! i�`' ��j�PI�ub� �i F t - '7� t �i��� � t � � 1 x t i � ti � i � �� 1 i�� i�I i r� ���
� u � /�iJrt � t�i� 1 �1 \ t t 1 t `�-'�` t t t 1 ! I t ! 11 � If t
�.T_ � 11��i � - } !l)f l � . i t\� \ ♦\1l\ �\ ♦ / 1 1 .� 1 { 5 � ! 1 � I I � l 1 1 I . �
. � 1l1��-� i� I�fBt!(�f i f i ♦ �J�-�`J ti�\�\>�� 11 1 1 1 � f / � � 7 1 I PK�\ � \ 1 � / � I 1 1 i i � If�l r 1�I1 L 1 �
� f,��> s"� �1 1 � ��t 1 t Ji���t��V�����i.� t 1 t � t f � t � � 1 �
�� �1.� 1 �~� ��V�. i . l \ S � . �- { ( l S f/ f l l \ t 1 1 � 11 ft i / f
t l f � i � �
C = � / 1 1 \� 1 ,`�♦ L 1 � I i � � 1 5 t 1 1 I �\ l 1�i t \ l 1 �t � ��
1 �/"i�/ '--�H k 1 V /
1 � !I�/11 1 , \ i 1 l } l 1
�" ,v� .�t��» � J t ! 1 1 � �i(i. t � �.�a , x \� �` �� f 1 � � i / � + ! 1 1 1 l t�� � 1 S
� `�i i .\ 1 t�l l\1 i p)n i t t t ! � ! � 1 �
� ��__=_ l 1�� !�!!!///R/lil� l t { i I I �111 � S � i � s � 1 j�f �����, l
� �ii�=-=_\\'C�1 , F% 1 )/ rj 1 . {ii���r�t/�i r I�I� i � t � / y �� ci ez � 1 1 l 1 1 t
i a���_ � . I 1 ! I111/. � � '� � ♦
� %i/��`,� \`�\`�\\, ��� !igl11N��t f!(t i� l 1 1 I � 1 �
'= � � - " �U�%i/�I(I�I!(I(l � � ; 1 , � �1� ,� '�. ; ; ������. �, � ' t ; ; �
!�//// l � 3 VI
� . � 1 1 1 ' , � �:�3=G � � � � � t t ; t s t � �' }������
. , , t � . � . ti `r t i -� . ,� � � + � i � i , � , � ; � i . ��
;i�,��ir�r 1!'r��t t t r 1 1 1 1 I 1 t i � t � I � � � t � � � f � � , � r 1 t � � � I �
1(�! �lNJl�! � � < < (�ilt1l{itt 11\11= ( 1 � V � 1 I � I ������..\1111 J � I 1 1 I ``k�'.s 1 . 1 1 1 l l t � 1 � t 1 � � t t �� ! ��� / / i�
ii�`Nu►c�jiiit� _ _ ���i+M�e.�`��ttt�t��ti�� � � 1 i �t j ,1 i �il 1 4 r 1 i� 4 1 1 ; � I � f � i r i i
�! ! t �\ t \ t�� 1 � I 1 1 t t t � / !
i �tilt l�\�'�\ � \1\�I11 � l 1 l lt l 1 f � � llltll t J ! 1 S <�,,2� � l � 1 \ y � i � f � /� I ! i I
�N (�!f y �f f t� �ty��� 1 1 1 1 \1\; 1 \ 30.6p 1 l !
1i�S � { f7 A� 1 V �ilSj � �\\\�� � I l�i 1 ` f ! � 1 � 7 �tillll ` } � f / �l� I � ` 1 l 1 l � i 1 � ! f 1 l 1 1 � ! ! ! / / !
}f�PYt��it} Tfi f ��WI+tIIL �\ � ♦ 1 � 1 lt 1 I litl 1 1 1 1 l i t I t � l 1 � t � 7 � r I r 1 1 � � �.
1t.:{�u ��St� 1 ( � 1 ti� � \ \���1 1 1 \ � { � 1\ �� � ! �`J � � 1 1 t � � 1 l 1 1 ! � 1
r ll I I t 1 rllpt 1 � i i' ! f ! i i I {�
� � I I sG � 1 lttil �1lt1 �` �`��\" ti1 1 �1 1 \ � / J � ( � 11{�1l S t i 1 ! , � I � 1 1 / !
� � 1�71ft��lU �11 l f ]1ilYt ti\ � � \ \ i� 4 1\1 i 1- � l t / f 1 1 1 1 J I i �� / � ! � 1 I � 1 1 1 �,
1• X t - l ! ��11 1 ���� � � �' � 1 11 vri52 I / 1 J � ! I
�. ��it4tu�tNtt� s �� �� �ttiat�.� � .... ���� � t ti �. �� � iii ?�-�� � � t t � • t t f i + f ��� � i i � 1 � � `� - -
f ApK� �i��t{ i� 1 ! f t�l \ ! \ i I ! J1/ 1 � 1
1 �11 tl \W. 1 \ �� ������ \ � I / - _ \ �lii "` I \ � ♦ 1 \ �'.�
t } »��f�>> �\ ��.�����\�\�\ 1�1 ��-- � � ti lS ` } > � 1 7
j / '��ilfs1\tltt\�.`� 5 `y -
i yc�ti i�`i�� t .-' ��� � � t i � � -�_?�;��:�•:���:::��� ���t. �_� a.H� 1 I i��4 ` { �n _ � � f��
� t �� J ����\�(tt.,�� i � < � 111� � � ' � \\�� �_J ! � t � 1( /
� ) �•Ryiii Tt / / � ����i1tP����\� , �`7:�15 111��� � �t= `� � �� - �
�1 ��i f �� / ` ' --l�Al��i r �; , � + 1\\ 6u76 5 \ ♦
� � f / 1 -�ii��/� � 1 =- . k J 1 1\ X - � � \\� � � � i
$ . / =-� i \� _ -� 1 1 .a \ �' ' 1 �
��^ 4/� f .�t �� - ��i � � - � rr \ i � � . �r
�ij� j t !. 1�\1� __�) � l ♦ _� �� 1- � r � � 1 � ` � �
\� .� 1 / i . . 1 \ 1 `
�/ 7 }�I �l\t � � � f i / , � �
i / ` / / I � / \ \ ` �� �
i J . ./ 1 14!� � . ! � ` )
� 1 t I � i / i f i \ ` \ 1
, / r � \
. ����� ,r /�� � r 1 �1 S14 ` �! f i ! l 1 t � �♦ �� .
;h.�� r / t 1 �
ti�A�� � ;f�/ ` ( I t 1 ;� �� ��\ � � � \ 1 � 1 �
, i�t�7y��ly�Mg , � f i ! ' / r J ::�, � � � ♦ � � t � � I i
� • , l� i l ' S 1 � � ' �
��§l!'{�'q� t � . / / f I I ,� \� L \ \ � 1 1
,�,�7$h t� ' � !� 1 /f 6 i! 1 I ��?%t j � ti� `j t!� �/ 1 {
�q. �� /� f f ! gI 1 �+ f 1 1 ! + i 1 � J j �
fi • � t t
t
�
./ ! r t t � i I f � 1 J i I
/�ll�I � I 1 � 1\\��t� { � � � i y j 1 =`�;� :s.G• � 1` � 1
���iii� ��. r ������ 1 f� t t 1 I j . j ! � ' � �`� i 1 ��f` � � '
� l� 1-\� � ! � � i ,� \ ] t L ��� \i;"� `` ; � � �� � !
! ! 1 ! i 1 1 l ♦♦ » 1 t
•r " � � t i i f i � � � t � � � � , �� ��������� �� i t � �' . �
� � ,�"� / � � / � I 1 \ � ! f � � � �ti \ \ \ � \ � �� \� t 1\f 1 1 11 J/� /� f 1 1 / �i'i - /
/ � \ l t f f i \ 11 1 . i
\ 7 i
, �\1 � ! i J 1 L � t � / i � !.! i f ! 1 t . � �
- i � f � i3 i i t � . ► �� t i r i i�r 1 � .a
/ >>���, t � � t � 1 �.� x . r I i I � . � ti � � r� � �1 i i . �—
r r -' \�\��\_��� � � � f f ! 1 � . � � \ ♦ \ /i�. t I I / / � i i
sAt' � l 1 ! / ! \ � \ \tii � �t!l1�f/1 rl � � � � / i
� � f I t 5 � � � � � 1 1 ! / /
� ' � � \ - ��2 �- ! � f \ 1 I�4t �i�� l 1 l S I ! �5�
:c ��n� - � � � l 1 1 1� i
�-_ � �� t 1 / \ 5 ♦ ! 1 f O
� ��___;������ ��',i 1 \ l / 1 s.r.�• � \ >: �1 1 l 111 1 1 1 1 �
j - -_-��a :�`���`� � � �-� � � 1 � �� �� � �� �� �� � � � t i�riil . I 11�t1�4\\�� tt� l 1 � � � � � � 's f/ �
� �`X � �__�_i?Za�`\��w`���\� 1 f 1 � � i 7 � \ , \ � \ 1 1 J l 1 1 11�1 l l � 1 t I � 1 � 1 1 � !
X � s "� _---_ � �_�� �`� � � 1 f �� 1 � i� 1 � � � '� , t �\�1i� 1 t L��ljltl4l� t � 1 i 1 � 3 t 1 1 � � �
! 1 I �� �9 _��`�a���'� \1 1 � ! t /� � J4�EI \ � t ` \ t l\ 1 � � \il��1N)i� I � 1 1 � � 4 l
! • X �f 1 / �SS�' �ii=��=_ .s_� �• 1 1 � � \ � �\ � l 5 �1�U t���. \ 1 \ !/ I i { l � 1 1 1
, Y ` ,� r ,_ - .,,;,:,;_ ��_�,__;, � } f . r s��<< . . „<<u,. �,,, ,�4, r , , , � � � , � r
t ���i�/!�llf//! �.��-��` '� 1 I / f � i� 7 . \ � l � � � 1 Sl t . 1 \ \1\t�l��yl � 1 � 1 1 t 1 � ' 1 �
. � liii�i���f//!�� �����J�_�-� � ( f � I �r 1 ; � �� �i �, 11�}II � 1 � � 5 � � 1 1 �
i i !/f7/ i i �- -�� - t 1 ! J ( l + \, 11{ 1� j51 flt , t � � � 1 1 1 1
'�.La !// // 1 / � I $ l
� �' �ftt�r�ll��l� �, r / �� i�` i � fl 1 1 1 1
� i r ! / / / � 1 ! \ ti ai��'� �� � ���\��?lt�\ 1 � 4 ti S � 1� \ � 1 / tl I t
i J I�t tl �1� I S � i� �� � I �� �� /.� �i � I lc.�s� �._v 4 1 t � j � \ \����.�\�\ � �\��������l t i 1 .; \ \\Z t f�i I �
1 !1 � / i � � � / � � � { t ! -� � ��� \ `Y � \ �ti � ` ! �
� x � ;;s �1�f}i��1 i l�j t � i� /� i�f��i� t i t� i 1 1 � � � x / �$`�� j V I � � 5 ����1����`�\� ���1 1�����`������`�������`��,1 \� � `
'3 ,�^ \�+����It1�jI�!1+1!j����'� i�r j/��,1 ! J f, % 1 ,\` % 1 �' ! l � 1 � � t �1, \� \Il�r'� 1 il� 1��a�``a.�i�i��ii"'�\
\ J j )����.. � �
1 i1\ I 11(1 f / � / 1 1 � 1 1 l t{ /I� ! ��
. . . l i f J�j1 t Ifi117 I!1��1 / f � � !� f� t j t t � �� � F ! j t1 \ t t � �� �����i 1� 1 1��!/�!/f�! y r!%
- ' :L. � � \ f 1}��rl f/,!J�ji 1 4 7 T t t�\t`�� . � J`� � / ! l. t �\ ;� � ,_t�69� r � � � :t �1 ..I �� � 7 1 1��!I f f��!f.� ! 1 I�1!
_ 1
�
� �� � �eaZ . - ll�rl�ltlfjlfCtl�� 1 � jli1 1 % \`\\\ �\` �``_+ �� � i ; �l .\ �' , �`i_ � i1t1� ��1el��tl� 11 �r11� f
. ....,,. ��
.�}•tY^}:.-- .. . .....-, -:. �_ ----• ..._, .. �::_�_.�- , -..:� ... � ... ,. ,,. �.:�-�: __. ;�t.-.:li. .k1 ll�.i .�'... ,�,; . :F-...., tJ.` x�u � ♦\ L� � 5 1
��!/IN` �' �� � � �!f���III3�1�fi11 � ! %/%� �l�t ` ,' ' �`r�.\\ ` ` �`_ ` ` `` x.���i .
riilf!`f � "'6 i�51�1t��iiljil�itf! r ! t �t 1 i 4'� 1 � f `�� ``� ssGa° % 1 � t �,` !
;ttft� h 11 �IN It1�tt � 11 � � a � f' � � ca�rrl � 1
•lt1��t� ��` -7.c7 rtljj�l�tij�l���jl�lss�� I t > > 1 j- � � t � � ��� � 1 . � t
tSllti� � ^ (h��tl����ilt'�I�tUt ! t � t � f ) � St.:2 / 1 � t �
yUl 1��� . �.:5 �"1�I�It���141�11�S1t�t� �,�\ � \ 1 \ � l:c.i2 � j 1 X �i � � �� 1 � 1I7I11VE' k�No�.i/R01
a�,���.��:`.� �- — rtiti'����it��{S���ii�►�i � �� � '. �� \ � i f i .' t � i r �w�a�seaav
������������� �� ♦ 11 1�y�llltil � ` � ` � �\''� � � � �� �qti J (
D'��������������:� .
x , litl�{ti�1lf 1t�4\�� � � � � � \ \ \ 1 / ♦ ! t I J7S.QlS7Q77 Ru/1521J.79d3
�� ������� 2a3e 33t ill SlI�t1 tti 1\\\� ♦ � \ ♦ � > > Si:o � l � � v . h j �
� "��:����a;u�,��t� x ,� >: _ �2 kuit ������� t�� � � � � '�t z t . i � r i �DESIGN
� � ��1� >>���� � � � . . 1� � F 1 t !
ti � \��`��:�"��������tii� . � ` ht�t:�t�t�����tti\\�����`�`�, �` �\ `� '��� t j � � j �� � i 1 �
t �� .:�:.��`��"�\������� _ 1�l�ty11,�����\,��\\�� \ \ � � � 1 i t t� , � 1 � �` r11 i I i ENG1NEfRlNG • PLANNING • SURYEYING
� ., ����\\\\\�����:\1L1�1 �]a�e X a:s.7• . 1 V f 1 l�11 l��U�l\�1\� \ \ \ \ \ 1 J 1 l ����• t F � 1 / ! � .
� l !�������i����������W y�� zaR X !,� 1�{��\lt�1q���Y\l\ \ 1 t ♦ \ S f J 4 \ � � � � � � ! �
' fJ / � 1��\��������v.�'��y\ I Y5te3 x Y'���1 V i l lllS1�\\�� \,\\`�```_���\l l \ �\ �` � �I SSa i 1 . �! � i
/�i � �t � � `��"`\:�+-����``�\�� �a.s3� ���i�������1`�\`�`�Ntil�i�_�_���=�������\� �� ! t r�' \\ x / / / /� �• �
r i i .% �„ia>:`�.�.���—���_ f � x�3o . . .,, � � �t � ! _—==�- 1 ..��1� � �_ � C H E R/ E �/�/�/ �
� _a�>��. �t�\�.��i .�.t�V �t�. � ���Q��\.� ��
DOW/VSTREAM MAP
PETER GANfVON
1235 BR/S70L S7REET
STOCKTON CA 95204
oa� NOV. 2003 SHEET OF
DESIGNED DEC 1 1
DRAWN ,S/�,g `PROJECT NUMBER
03090
IV. FLOW C0�ITROL & WATER QUALITY FACILITY' A�iALYSIS AND
DESIGN
A. HYDROLOGIC A.�IALYSIS
The hydrolo�c analysis was conducted using the King County Runoff Time Series
soft��are (KCRTS) methodology. The site soils, identified as Alderwood Series (AgC),
correlate to the KCRTS �oup Till. The SeaTac rainfall region was used, with a regional
scale factor of 1.0. There is no impervious area associated with the existing site
development. Of the entire 4.98ac, only 3.07ac will be developed. The remainder of the
site will include the coal mine hazard area, two Category III wetlands, and undeveloped
open space. Lsing the predeveloped pen�ious area shown in the table below, a
predeveloped time series was generated.
Upon completion of the final improvements, tlle developed timeseries was manufactureci
in much the same way. The developed site's impervious area was arrived at using tlie
1998 King County Surface Water Drainage Manual (KCSWDM), Section 3.2.2. Using
this criteria and applying it to King County Code (K.C.C. 21A.12.03) for Urban
Residential - R-S z�ninU, the masimum impervious coverage for the lots is 75%.
Pre-Developed Area Developed Area
(.=�cres) (Acres)
Till Forest 3.070 -
Till Grass-Lots & Misc - 0.537
� � ` -
Impervious-Roofs - 1.426 � �— = " '
Impervious- - 1.107
Streets, SW, etc.
Total 3.070 3.070
\ote: The developed areas were measured directly from the site plan using a planimeter.
l iirc I)c�i��n. Inc. l�heric i.:�nc Ya��c ��
3.2.2 KCRTS/RUNOFF FILES MET'HOD—GENERATING TIME SERIES �
' T�BLE 3�.�.B EQUIVALENCE BETWEEN SCS SOIL TYPES AND RCRTS SOIL TYPES::
SCS Soi(Type SCS KCRTS Soil Notes
Hydrologic Group
Soil Group
Alderwood (AgB,AgC,AgD) C Till �
Arents, Alderwood Material (AmB, AmC) C Till
Arents, Everett Material (An) B Outwash 1
Beausite (BeC, BeD, BeF� C Tili 2
Bellingham(Bh) D Till 3
Briscot (Br) D Till 3
Buckley(Bu) D Till 4
Earlmont(Ea) D Till 3
Edgewick (Ed) C Till 3
Everett(EvB, EvC, EvD, EwC) A/B Outwash , 1
Indianola (InC, InA, InD) A Outwash 1
Kitsap (KpB, KpC, KpD) C T+II
Klaus (KsC) C Outwash 1
Neilton (NeC) A Outwash 1
Newberg (Ng) B Till 3
Nooksack (Nk) C Till 3
Norma (No) D Till 3
Orcas (Or) D Wettand
Oridia (Os) D Till 3
Ovall (OvC, OvD, OvF) C Till 2
Pilchuck(Pc) C Till 3 '
Puget(Pu) D Till 3
Puyallup (Py) B Till 3
Ragnar(RaC, RaD, RaC, RaE) B Outwash 1
Renton (Re) D Till 3
Salal (5a) C Till 3
Sammamish (Sh) D Till 3
Seattle (Sk) D Wetland
Shalcar(Sm) D Till 3
Si (Sn) C Til! 3
Snohornish (So, Sr) D Till 3
Sultan (Su) C Till 3
Tukwila(Tu) D Till 3
Woodinville (Wo} D Till 3
Notes:
1. Where outwash soils are saturated or unde�lain at shallow depth (<5 feet) by glacial till,they should
be treated as till soils.
2. These are bedrock soils, but calibration of HSPF by King County DNR shows bedrock soils to have
similar hydrologic response to till soits.
3. These are altuvial soils,some of which are underlain by glacial till or have a seasonally high water
table. !n the absence of detailed study,these soils should be treated as till soils.
4. BucWey sals are formed on the low-permeab9l'rty Osceola mudflow. Hydrologic response is
assumed to be similar to that of till soils.
1998 Surface Water Design Manual , 9/1/98
3-25
SECTION 3.2 RUNOFF COMPU!'ATION AND ANALYSIS I►g'THODS
FIGURE 3.2.2.A RAINFALL REGIONS A.'�iD REGIONAL SCALE FACTORS
sr�.a
� ST 1.1 - - ST 1.0 LA 0.8 LA 0.9 LA 1.0 LA 1.2
fMOMOYISN COYMT♦
�� � KIMO COYMfY
14�.
}/� .�I I�A�Ai.' 1 �
_� ��
F_ ��� r
�I L,:j �' �`
\ f �J I � -
w•i
rnC- 1 �`~� !, V�I �.
� Q F
•�"'�� .{�_ � ' ..
t . E '�
�-' � - _ � ,+ ,y �n.wo
,f' � a ,•' �! � g�
Y .
J � .1"� ''�. �-�- j'�� s��1
�� 1y �^� -'' � . , .�l
:. J -� 1 � � � \
� - t .`?�'r r �.1� � �', r . Q
- � *. f, /^+.
j,, - A�F r�'"�_ � < 1�^�� r-
:$T _ �'. ,wu�:. •>��F `t-�- l, ; �
C� ,,�'- - :t :� £LCEYi7E � �
+�' 1 .)T
�9 t � 4'!�I� , �"'�- .
f i - " f _q 1'� "''� �
c-. : �i �- . -� ��� � � rr"� ��
. �,/ . ....�q. < ♦ �� � I
3' }� 4 _1 � 8 ^ �
} �� .{ � '. f �� 1 .("'1� �_ �
i .,.v
y� .l �• � � f.J ,.��- �,� ^ � � � ��Y�f�^�
f.SC/tl IL�:' - � . -,r Lr _ � d; �_�n
f; `lr � " '' '°'" � ��
T��� .� tuewr. � -� �.7. �
. '� -�� �I ,� .� �, `.M �i � � / L. _.
`'•�' _y' �''. - '� D '/., � � �
n:a ,aena`�' - �
Q. � _ ` � !: --�.
,..� . � \ _ j ' �
. J�i� r FAC 41 .. �r. :•. � l . m�se�
�:�_ � � : �' a� �� � LANDSBURG
��.. ,. L1 � . ,,�:;o r � o
�
� �- N.-� ' ._- `' ! Q
1 �YIIT,� r
. — �� �•.�P I
�1 �/�-^��'.-r---�-1, .
ti
. �•. " � , �,,�, �
� f �� I .i u.e��° � .
. S:iif _ 1.� i ���.�'.
Q f - ✓
..'ti - '1' �Y2"`�: 9- L?
. - � F� �—� \ ` -
.�: � � \ti�\ �.
i ' -..° y � . �y_.
'�:, t/ u�u�r�., � 'wxr; - .
- {..: ` on"4"'�
ST1.1 L �� Y �' "r .
"r�' ��-:- _ -' S
�t. ,-wiio�eouHrr` �
►iuet cour►� \
i
ST 1.0 0�� �
�
=�-
ST 1.0/ �
Rainfall Regions and �,0.8 K` ^i � `
�
Regionai Scale Factors �a o.s
�� Incorporated Area
LA 1.Q LA 12
� RivedLake
Major Road
9/1/98 1998 S,urface Water Design Manual
3-22
SITE STATISTICS
Site r'�-ea 217,?03 (4.98ac)
Undeveloped (Coal Mine, Wetland, Open Space) 86,563
Upstream Area 3,150
Total Developed Area 133,790 (3.07ac) �i
IMPERVIOUS '�
S. 35th Street R-O-W 22,614 '
Wells Ave. S. R-O-W 22,468 "
Lots (82,825 * 0.75) 62,119 ''
Upstream - Wells Ave. S. R-O-W 3,150
Subtotal 110,351 (2.533-ac}
PERVIOUS ��
S. 3�th Street R-O-W 2,733 I
Lots (8?,82ti*0.?5) 20,706 �I
Subtotal 23,439 (0.�3'?-ac) I
Totat 133,790 (3.07-ac) '
\ote: The ina�imum imper�iou� `;� per lot is 7�';�� '
Core Desi�;n. Inc. Cheric L�ne Pr 1 nC'_
Lot Breakdown
Area Area Area
Lot�10. (SF) �� Lot No. (SF) � Lot No.�' (SF)
1 5,152 6 6,437' 11 4,708
2 ' 4,500; 7 4,694 12 � �,068
3 4,500 j 8 5,126 � 13 5,500
4 4,637 9 5,413 � 14 6,189
5 5,983, 10 ; 5,281 i 15 ' 4,500
I ; ' 16 I 5,137
— --- �—�TOTAI: 82,825
i �
� i
I
i
I_.
il
� �-_1
Core Desien,Inc. Cherie Lane Ps?of 2
21A.12.030 ZONING
21Al2.030 A Densities and dimensions - residential zones.
RESIDENTIAL
Z RURAL URBAN URBMI
O
N RE- RESICENTIAL
E
S s�1/E •`1 J �
ST/WDARDS RIr23 R.45 R/1r10 R/420 UR R-1 R�4 R� R�8 R-12 R-18 R-24 R�
(��
Bas�D�nsity: 0.2 0.2 0.1 OA3 02 � 4 6 8 12 18 24 18
Dwalling du/ac dulae dulae du/ae dulac du/ae du/ac dufae du/u dulae dulac dulae dWx
UNU/1er� (21) (8)
(1s,
Mla�dmum Density: O.t 0.4 6 9 12 1s 27� 36 72
Dw�lltnp UNUIicr� dulu dul�e duhc du/ac dulx dulu dulae du/ac duhc
h1 t�) (Zol (u)
ww�,.�m o.�r;ey:
as�c ssx esx eox �sx �ox �x
(z) ���� ��z) (�2) (�a� ��s� ��s� ��s�
��s� ��a� ��s�
(�)
Minlmun Lot/Nsa �.l73 3.73 ac 7.3 ac 15 ac
(13) ac
Ilinimum Lot �33 ft �33 R 133 R 135 R 35!t 35 ft 30 ft 3�R 30 ft 30 ft 30ft 30 it 30 ft
+�� m m
(3)
Minimun Stnet �� �tt � �� �� yp� 101! 10 R 10 R 10 R 70 R 10R 10 ft
� (9) (9) (9) (9) (T) (�) (8) (S) (01 (8) (a) (8) (a)
(3)
Minimwn IrKsNor S tt 70ft 1011 �0 R S R 5 R S ft S}t S R 3 ft S tt S Tt 5 S
Sr�ack I9) (91 (91 (9) m m ���) (��) �10) ���) �I
(31�'16)
Bas�ii�4ht 10 R �0 ft �01t 10 R 33 R 33 ft 33 R 3S R 33 tt 60 R 60 R 60 it 60 ft
(4) IS R IS ft SO R OO ft BO R
(74) (14) (14) (74) ('14�
Ma�ch�wm 23% 20X 13X �25% 30X 30X S5% 70X 73% j 0.SlL a3% dS% 90X
� /
Imprvious (�1) {11) (11) (11) (�1) (11) `J
suKau: ��s� ��s� ��s� ��9�
P.rc.�taa�(�)
B. Development conditions.
1. This maximum density may be achieved only through the application of residential density
incentives in accordance with K.C.C. chapter 21A.34 or transfers of density credits in accordance with
K.C.C. chapter 21A.36 or 21A.55, or any combination of density incentive or density transfer. Maximum
density may only be exceeded in accordance with K.C.C. 21A.34.040F.1.g.
2. Also see K.C.C. 21A.12.060.
3. These standards may be modified under the provisions for zero-lot-line and townhouse
developments.
(King County 3-2001)
21 A-105 �
B. WATER QU:�LIT�' FACILITY
T'he water quality volume far Cherie Lane ���as calculated usin� the King County Surface
Water Desi�Manual (KCSWDM), 1998 Edition, pages 6-68 to 6-�l.
Vb = f�(0.9A; + 0.?SA,� + O.lOAt,� 0.10?�)*(R'1?j
Where; Vb = wetpool volume (ct�
f= volume factor
A; =area of impervious surface (st)
A�g= area of till soil covered with grass (sfl
A�f= area of till soil covered with forest (s�
Ao = area of outwash soil covered with grass or forest
R= rainfall from mean annual storm (inches)
(refer to the attached precipitation �raphj
Thus,
V'b = 3[(0.9(ll 0,;�1) - 0.�'Sl'�-4;91}(0.-�i�1�)]
V�� = 1?.358cf
Due to the lar,e area or the �°ault, the ���ater qtialitv depth���ill be controlled by the
minimum depth requirements and length to �vidth ratio recommendations as called out in
the KCSWDM, pg 6-80, 6-81, and 6-94: �' deep for the first cell and 3' for the second
cell with a length to width ratio of at least 3:1.
Cure Desi��u. Tnc. Cheric L��i�e Pa�e i
6.4.1 VVETPONDS—BASIC�.ND LARGE—M�THODS OF ANALYSIS
FIGURE 6.4.1.A PRECIPTTATION FOR MEAN ANNUAI.STORM IN INCHES (FEE�
s�r 1.a� i,.� i.2
ST 1.I - - ST 1.0 i,p, 0.S LA. 0.9 � 1.0
: . a ..
i_ / � ��4 � :; � _T� M t':qo`^e n�1Y
���� � .1 I �� ���� ��_ 1 4
/ �
: �._.� � �.- y J 1�`•.t:
�
- i� '' 1�"�.•._. . � � � ;".Q �
-- _ �= ' �� .-7
� - .�� ^ •� �``t
�� l t �1�� �`` ��y�
� �� ��
� �� � �_ ��� r.,���r�l
\��,, s �. r ,� ., .���� �
_ � ~ �\ �- "'i'� � 8
_ t � � f�,. .=.�� -Y---
� I ° � r.6 r ,
- •.,� L.� f .I� ' ���i �O
i �;_ r _ i
- � ' _ � T ._"y'�c �s� i � 1 �
stuxi x`. _ I'�—i
- ��� ��'j _ _ -,� -i�.�` ...: ���
" v f�' j r.r �r.�" �-� .�, �F. — .`1-,� i �
{f - . �t� ` . � � � : r �. r l^ �j� Y\
,..J., i � . / y� �,� ^� �. r�
,y L'1 r �� - �`� _~.���../%�� �//���,nzy��L ` �
� 1 , � r�1 �1 ''ti ' .�\ / �� y. �\ _
� .� ,., - _ 1 � Y� �� =� .
�i ,-- – _ � �1
� �_� ..�.� � � �
� ; I � �, �i .�., . _ ,
- i E; .-c- r �
_ r .,r - �- ' -
_ � ��.; .-.� p �"'�', .�y:
",. �aL � 1 0 � ��:
= _'i � •�,,+*� �,. �' ,r�•S 1`~ t ......,-_
i� [, ,�' 1�0. { '~ _ Q /' `�\�/
_,,,�. _ .�1.r ti� t -{. _\ / Q
' - '�� C':� :1. { �../ � Q
L F '�".I.`�� .
�. � n.
. '� ,� i
-;lqa i LJ�, �- t i
a��a ' y \ :�S �
ly � '* �_�.%� ! i p
- - ;�"� 1';t' j �� `�^ -
� _ � � _. • �''1,`\ ` -`�ti'r.'
`f, � ��' ' � 'r i
0.54" .u�,�:�i.. .o' ':R� � -
(0.045' ) f/� B � :.- < 0 --
��/}.�+.' �:4:1��IiMO.f'e0i21.\� !
.tsse� :oow�t �
t
0.47' �
(0.039') �� G i •
;�
=j�.�.
,��
_.. Incorporated Area � '�
� � .,�
.� Rivedlake 0.47• �`t ,-.\
— MajorRoad (0.039') 0.52" `~-�,--� ,
(0.043'1 0.65"
NOTE:Areas east of the eastemmost isopiuvial should use 0.65 0.5 6" {0.054' )
inches unfess rainfa8 data is avaiable for the locatian of ir�teresi {0.047' }
N Ths mean arrwd atorm is a canap4�al slortn fand
by dividirg 1M antwri p�edpialion by Ihs tofal rnmber
as+o��v�rar
result,generates large amounts of runoff. For this application, dll soil types include Buckley and
bedrock soils,and alluvial and outwash soils that have a seasonally high water table or are underlain at
a shallow depth(Iess than 5 feet)by glacial rill. U.S.Soil Conservation Service(SCS)hydrologic soil
groups that aze classified as till soils include a few B,most C,and all D soils. See Chapter 3 for
classification of specific SCS soil types.
1998 Surface Water Desi�n Manual 9/1/98
6-69 �
C. FLOW CONTROL FACILITY
The detention routing calculation, a continuation of the hydrologic modeling, requires a
Level 2 Flow Control analysis (KCSWDM pg. 1-32}: match pre-developed discharge
durations to developed discharge durations from 50% of the 2-yr peak flow up to the full
50-year flow, assuming existing site conditions as the pre-developed condition. (The
peak matching criteria of Level 1 Flow Control must also be met.) The following
printout shows a 47,008cf vault (62'x 68' x 11.15' deep) in conjunction with the
documented control structure will provide enough live storage (detention) to satisfy this
requirement. As a result of the vault depth however, approximately the first 125 feet of
offsite pipe (18" CPEP) will need to be relayed at 0.5°/o, versus the existing 6.15% (refer
to the Site Plan in Section I).
�
Core Desihn. Inc. Cherie Lane Page 8 �
�
KCRTS Output
Flcw :reque icy �;na��.,-sis
Time Series File:prede��-.ts�
Project Location:Sea-Tac
---Annual Peak Flow Rates--- ---Flow Frequenc�_� A�alys=s-----
Flow Rate Rank Time of Peak - - Peaks - - Ranx Return Prob
(CFS) (CFS) Period
0. 19a 2 2/09/O1 18:00 0.247 1 100.00 0. 990
0. 052 7 1/06/02 3 :00 0. 194 2 25 .00 0 .960
0. 143 4 2/28/03 3 :00 0. 148 3 10.00 0 . 900
0.005 8 3/24/04 20 :00 0. 143 4 5.00 0. 800
0.085 6 1/05/05 B :00 0. 125 5 3 .00 0.667
0.148 3 1/18/06 21:00 0.085 6 2 .00 0.5C0
0.125 5 11/24/06 4 :00 0.052 7 1.30 0 .231
0.247 1 1/09/08 9:OC 0.005 8 1. 10 0. 091
Computed Pea;:s 0 .229 50 . 00 0. 980
Flcw Fr2quenc�,� �.ral;�s��
Time Ser�es File:dev.tsf
Project Location:Sea-Tac
---Annual Peak Flow Ra�es-- - ---F�o�f; �recuer_cy Analysis-----
r^low Ra�2 Rank Time o* �eGk - rea'.,�a - Rank 3e�i.:rn Fr_-�
(CFS) (CFS) Period
0.662 6 2/09/O1 2 :00 1.31 1 100.00 0 . ;90
0.565 8 1/05/02 16:00 0.93� 2 25.00 0. 960
0.796 3 12/08/02 18:00 0.796 3 10.00 0. 900
0. '041 7 8/26/04 2 :00 0 .765 4 5.00 0. 800
0.?65 4 10/28/04 16:00 0.706 5 3 .00 0. 667
0 .706 5 1/18/06 16:00 0.662 6 2 .00 0.500
0.933 2 10/26/06 0 :00 0.641 7 1.30 0.231
1.31 1 1/09/08 6:00 0 .50'5 � 1 .10 C . 091
Compute�' Feaks 1. 18 50. 00 0 . 98�
Flcw Fr�_uencv Ana�ysis
Time Series File:dev-15.ts�
Project Location:Sea-Tac
---Annual Peak Flow Rates--- -----Flow Frequency Analysis------
Flow Rate Rank Time of Peak - - Peaks - - Rank Return Prob
(CFS) (CFS) Period
1.21 6 8/27/O1 18:00 3.26 1 100.00 0.990
0.842 8 9/17/02 17:45 2.40 2 25.00 0.960
2 .40 2 12/08/02 17:15 1.65 3 10.00 0.900
0.971 7 8/23/04 14 :30 1.38 4 5.00 0.800
1.31 5 10/28/04 16:00 1.31 5 3 .00 0.667
1.38 4 10/27/05 10:45 1.21 6 2 .00 0 .500
1.65 3 10/25/06 22 :45 0.971 7 1.30 0 .231
3 .26 1 1/09/08 6:30 0.842 8 1. 10 0 .091
Computed Peaks 2 . 97 50. 00 0 . 980
('r�re 1)etii�n. Inc Cheric l.:iiie i'a«e �1
IKCRTS Output
Retent�on/De�er�t_cn Facil�ty
Type of Faci�it;✓: Detention �iault
Facility Length: 62 . 00 ft
Facility Width: 68. 00 ft
Facility Area: 4216. sq. ft
Effective Storage Depth: 11.15 ft
Stage 0 Elevation: 170.85 ft4'
Storage Volume: 47008. cu. ft
Riser Head: 11.15 ft
Riser Diameter: 18.00 inches
Number of orifices: 2
Full Head P��e
Orifice # Height Diameter Discharge Diamete�
(ft) (in) (CFS) (ini
1 0.00 0.771/ 0.054
2 7.20 1.44 0 . 1�2 4 . 0
Top Notch Weir: No e ,
Cu'�=1o�,� Rat�r_g Cu--.e: rd^n I�C "�
S�age Elevatior_ Storage Discharge Perco�a���on
(ft) (f�) icu. ft) (ac-ft) icfs) (cfs}
0.00 p�170.85 0. 0.000 0.000 0. 00
0.01 170.86 42. 0.001 O.GO1 0. 00
0.02 170 .87 84. 0.002 0.002 0.00
0.03 170. 88 127. 0.003 0. 003 0.00
0.04 170.89 169. 0. 004 0. 003 0.00
0.05 170.90 211. 0.005 0. 004 0.00
0.06 170. 91 253. 0. 006 0.004 0.00
0.25 171.10 1054. 0.024 0.008 0.00
0.44 171.29 1855_ 0.043 0 .011 C. 00
0.63 171.48 2656. 0. 061 0 .013 0. 00
0.82 171.67 3457 . 0 .079 0 .015 0. 00
1.01 171.86 4258 . 0. 098 0 .016 0. 00
1.20 172.05 5059. 0. 116 0 .018 0.00
1.39 172.24 5860. 0. 135 0 .019 0.00
1.58 172.43 6661. 0.153 0.020 0.00
1.77 172.62 7462. 0. 171 0.021 0.00
1.95 172.80 8221. 0.189 0.022 0.00
2 .14 172.99 9022. 0.207 0.024 0.00
2 .33 173.18 9823. 0.226 0. 025 0.00
2 .52 173.37 10624. 0.244 0.026 0.00
2 .71 173 .56 11425. 0.262 0.026 0.00
2 .90 173 .75 12226. 0.281 0 .027 0.00
3 .09 173 .94 13027. 0.299 0 .028 0.00
3 .28 174.13 13828. 0.317 0.029 0.00
3 .47 174.32 14630. 0 .336 0.030 0. 00
3 .65 174.50 15388. 0 .353 0.031 0.00
3. 84 174.69 16189. 0 .372 0.032 0.00
4. 03 174. 88 16990. 0 .390 0.032 0.00
4.22 175. 07 17792. 0 .408 0.033 0. 00
4.41 175.26 18593 . 0 .427 0.034 0. 00
4.60 175.45 19394. 0 .445 0.034 O . 00
4.79 175.64 20195. 0.40'4 0.035 O . 00
4.98 175 .83 20996. 0.482 0.036 0 . 00
5.17 176.02 21797. 0 . 500 0 .037 0 . �0
Cure Design. Inc. C'heric Lane Pa�e 10
KCRTS Output
5.36 176.21 22598. 0.519 0.037 0.00
5.54 176.39 23357. 0.536 0.038 0.00
5.73 176.58 24158 . 0.555 0.039 0. 00
5. 92 176.77 24959. 0.573 0 .039 0. 00
6. 11 176.96 25760. 0.551 0 .040 0.00
6.30 177.15 26561. 0.610 0.040 0.00
6.49 177.34 27362 . 0.628 0.041 0.00
6.68 177.53 28163 . 0. 647 0.042 0.00
6.87 177.72 28964. 0.665 0.042 0.00
7.06 177.91 29765. 0. 683 0.043 0.00
7.20 178.05 30355 . 0.697 0.043 0.00
7.21 178.06 30397 . 0.696 0.044 0.00
7.23 178 .08 30482 . 0.700 0.045 0.00
7.24 178 .09 30524 . 0.701 0.047 0.00
7.26 178 .11 30608. 0.703 0. 050 0.00
7.27 178 .12 30650. 0.704 0. 054 Q.00
7.29 178 .14 30735. 0.706 0. 059 0.00 �I
7.30 178.15 30777. 0 .707 0. 062 0.00 I
7.32 178.17 30861. 0 .708 0. 063 0.00 I
7.33 178.18 30903 . 0 .709 0. 064 0. 00
7.52 178.37 31704 . 0 .728 0.076 0. 00
7. 71 178.56 32505. 0.746 0.085 0. 00
7.90 178.75 33306. 0.765 0.092 0. 00
8. 09 1i8.94 34107. 0.783 0.099 0. 00
8.28 179.13 34908. 0. 801 0.105 0. 00
8.47 179.32 35710. 0.820 0.110 0. 00 I
�
8.66 179.51 36511_ 0. 838 0.115 O. 00
8. 85 179.70 37312 . 0. 857 0.120 0.00
9. 04 179.89 38113 . 0. 875 0 .125 0. 00
9.22 180.07 38872 . 0. 892 0 .129 O. GO
9.41 18C.25 39673 . 0 . 911 0 .133 0. �0
9.60 180.45 40474 . 0. 929 0 .137 O. GO
9.79 180.64 41275. 0. 948 0.141 O. CO
9.98 180.83 42076. 0. 966 0.145 0.00
10.17 181.02 42877. 0. 984 0.148 0. 00
10.36 181.21 43678. 1.003 0.152 0.00
10.55 181.40 44479. 1.021 0.155 O. CO
10.74 181.59 45280. 1.039 0.158 0. 00
10.93 181.78 46081. 1. 058 0.162 0. 00
11.11 181.96 46840. 1. 075 0.165 0. 00
i1.15 182 .00 47008. 1. 079 0.165 0.00
11.25 182 .10 47430. 1. 089 0.629 0.00
11.35 182 .20 47852. 1.099 1.480 0.00
11.45 182.30 48273. 1.108 2.570 0.00
11.55 182.40 48695. 1.118 3 .870 0.00
11.65 182 .50 49116. 1.128 5.340 0.00
11.75 182 .60 49538. 1.137 6.770 0.00
11.85 i82.70 49960. 1.147 7.300 0.00
11.95 182 .80 50381. 1. 157 7 .790 0.00
12 .05 182.90 50803 . 1. 166 8.250 0.00
12.15 183.00 51224 . 1. 176 8 .690 0.00
12.25 183.10 51646. 1. 186 9.110 0.00
12 .35 183.20 52068. 1. 195 9.510 0.00
12 .45 183 .30 52489. 1.205 9. 890 0.00
12 . 55 183 .40 52911. 1.215 10.260 0.00
12 . 65 183 .50 53332. 1.224 10. 610 0. 00
12 .75 183 .60 53754. 1.234 10. 95Q 0.00
12 .85 183 .70 54176_ 1.244 11.290 0.00
12 . 95 183 . 80 54597. 1.253 i1. 610 0. 00
Core Design. Inc. Cherie Lane Page 11
� .
KCRTS Output
Hyd Inflow Outflow Peak Storage
Target Calc Stage Elev (Cu-Ft) (Ac-Ft}
1 1.31. 0.25 0.60 11.24 182: 09 47407. 1.088
2 �, 0.66 *******=v� 0.16 10.70 181.55 45094 . 1.035
3 0.68 ******* 0.14 9.59 180.44 40440. 0.928
4 �0 0.79 *******��y 0.14 9.71 180.56 40950. 0. 940
5 0.71 ******* 0.08 7.71 178.56 32492. 0.746
6 0.42 ******* 0.04 6.61 177.46 27885. 0.640
7 0.57 ******* 0.04 6.51 177.36 27454. 0.630
8 0.64 ******* 0.04 4.80 175.65 20239. 0.465
----------------------------------
�
Core Design. Inc. Cherie Lane Page 1Z �I
KCRTS Output
Route Time Series through Facility
Inflow Time Series File:dev.tsf
Outflow Time Series File:rdout
Inflow/Outflow Analysis
Peak Inflow Discharge: 1.31 CFS at 6:00 on Jan 9 in Year 8
Peak Outflow Discharge: 0.603 CFS at 10 :00 on Jan 9 in Year 8
Peak Reservoir Stage: 11.24 Ft
Peak Reservoir Elev: 182.09 Ft
Peak Reservoir Storage: 47407. Cu-Ft
. 1. 088 Ac-Ft
Flow Duration from Time Series File:rdout.tsf
Cutoff Count Frequency CDF Exceedence Probability
CFS % °s %
0. 002 26562 43 .317 43 .317 56.683 0.567E+00
0 . 007 6431 10.488 53 .805 46.195 O.a62E+00
0. 012 5640 9.198 63 .002 36.998 0.370E+00
0. 016 5961 9.721 72 .723 27 .277 0.273E+00
0. 021 5486 8 .947 81.670 18.330 0.183E+00
0 . 025 3410 5 .561 87 .231 12 .769 0. 128E+00
0 .030 3262 5 .320 92 .�51 7.449 0.745E-01
0 . 035 1917 3 .126 95 .677 4 .323 0.432E-01
0 . 039 1502 2 .449 98.126 1.874 0.187E-01
0 . 044 82E 1.347 99.473 0.52? 0 .527E-02
0 .049 18 0.029 99.503 0.497 0.497E-02
0 . 053 9 0.015 99.517 0.483 0.483E-02
0 . 058 6 0.010 99.527 0.473 0.473E-02
0 . 062 9 0. 015 99.542 0.458 0.458E-02
0 . 067 24 0.039 99.581 0.419 0.419E-02
0 . 072 21 0.034 99.615 0.385 0.385E-02
0 . 076 18 0.029 99.644 0.356 0.356E-02
0 . 081 22 0.036 99.680 0 .320 0.320E-02
0 .085 32 0.052 99.733 0.267 0.267E-02
0 . 090 26 0 .042 99.775 0.225 0.225E-02
0 .095 11 0.018 99.793 0.207 0.207E-02
0 .099 7 0.011 99.804 0.196 0.196E-02
0 .104 8 0.013 99.817 0.183 0.183E-02
0 .109 10 0.016 99. 634 0.166 0.166E-02
0. 113 7 0.011 99.845 0.155 0.155E-02
0. 118 14 0.023 99.668 0.132 0.132E-02
0.122 8 0.013 99.881 0.119 0.119E-02
0 . 127 11 0. 018 99.899 0.101 O.101E-02
0. 132 8 0. 013 99.912 0.088 0.881E-03
0 . 136 12 0.020 99.932 0.068 0. 685E-03
0 . 141 15 0.024 99.956 0.044 0.440E-03
0 . 146 9 0.015 99.971 0.029 0.294E-03
0 . 150 3 0.005 99.976 0.024 0.245E-03
0 . 155 4 0.007 99.982 0.018 0.179E-03
0 . 159 3 0.005 99.987 0.013 0.130E-03
0 . 164 5 O . 008 99. 995 0 .005 0 .?89E-04
Core l�esiQ��. lnc. C�herie Lane Pa�e 13
KCRTS Output
Duration Comparison Anaylsis I�I
Base File: predev.tsf
New File: rdout.tsf
Cutoff Units: Discharge in CFS ,
-----Fraction of Time----- ---------Check of Tolerance-------
Cutoff Base New %Change Probability Base New aChange
0 .043 i 0 .93E-02 0.68E-02 -26.9 � 0.93E-02 0.043 0. 042 -1.6
0 . 054 � 0 .62E-02 0.48E-02 -23.3 � 0.62E-02 0.054 0.043 -21.2
0.066 � 0 .49E-02 0.43E-02 -12.4 I 0.49E-02 0.066 0. 052 -21.5
0.078 � 0 .37E-02 0.34E-02 -6.7 I 0.37E-02 0.078 0.074 -5. 0
0.089 � 0 .28E-02 0.23E-02 -18.5 I 0.28E-02 0.089 0.085 -5.3
0.101 I 0.22E-02 0.19E-02 -12 .7 � 0.22E-02 0.101 0 .092 -8.7
0.113 I 0.15E-02 0.15E-02 6.7 I 0.15E-02 0.113 0 .116 2 .9
0 . 124 � 0.96E-03 0.11E-02 15.3 I 0.96E-03 0.124 0 .129 3 .8
0. 136 � 0.60E-03 0.70E-03 16.2 I 0.60E-03 0.136 0 . 137 1.1
0. 148 ( 0.34E-03 0.28E-03 -19.0 I 0.34E-03 0.148 0 .144 -2 .5
0. 159 � 0.21E-03 0. 13E-03 -38.5 I 0.21E-03 0.159 0.154 -3 .4
0. 171 � 0.16E-03 O.00E+00 -100.0 � 0. 16E-03 0.171 0.156 -8.5
0. 183 � 0.82E-04 O.00E+00 -100.0 � 0.82E-04 0.183 0.163 -10. 8
Max�mum positive excursion = 0.006 cfs ( 4 .8%}
occuring at 0.126 cfs on the Base Data:predev. tsf
and at 0.132 cfs on the New Data:rdout.tsf
Maximum negative excursion = 0.019 cfs (-29.5%)
occuring at 0.063 cfs on the Base Data:predev.tsf
ar.d at 0 . 015 cfs on the Ve.,� �Gt3�rdout. �sf
(�nre Uesign. Inc. C�heric Lane Page 1-�
SEC'I'ION 5.3 DET'ENT'ION FAC1LITfES
Riser Overtlow
The nomoaraph in Fi;ure�.3.4.H can be used to determine the head (in feet)above a riser of Qiven
diameter and for a given flow(usually the 100-year peak flow for developed conditions}.
FIGURE�.3.4.H RISER INFLOW CURVES
ioo I ' I 72 54 48
�
I � I , I ` � !
I I f 42 I
I I �' ' ' � I I , � i
� I ' � ' 36 � i
' I I � 33 � �
i I
� 30 I
� i � ' f
� � i 27 �
� �
I 24 �
I � z � �
i 2�' I�
� � � ' i '
o � i I ' ~ � '�
18 w � .
� ; I � i �
a ; � ° � �
to � '
� '. � 15 w � ! I
� I i i S
3 i � I ' i I I
Q , 2 I I
i ' i i �
� ,
� i I !
' I � � 10 �
� t
� f i
y
` �L� - :✓- '� � . ' i
� :
Dt v-�s (
I �
I �
' � i
�
�
i �
' i ' I �
1 i � � I '
o.� G.5' � io
HEAD IN FEET (measured from crest of riser)
Qweir=9.739 DH��2
s �rz
�orifiee=3J82 D H
o +n cfs, D and H in feet
Slope change octurs at weir-orifice transi�ion
9/1;98 1998 Surface Water Desi=n Manual
�-50
V. CONVEYANCE SYSTEM ANALYSIS AND DESIGN
The conveyance system for the site was designed using the King County Backwater
Analysis Spreadsheet (attached). For simplicity, the entire developed flow (with 15- I
minute time steps, 3.26cfs) was routed through each catch basin. The theoretical I
maximum water surface elevation does not exceed any catch basin rim using this analysis �'��
method. I
Core Design,Inc. Cherie Lane Page 15
- , ,,. . ,..,...... .
.. . ..... .... ..� . . � . � • .. .;. .,.�.:'IIACKWAT.Eft�ChGC'UI:AT.IONS '
Jf)6 NAAIf CHERIE LANE PREI AItED BY: S.Sehroeder,Y.E. I
JUBiVll�illl:lt: 1130')U Up,51GNS1'URM: IUO VkAH
EN'fItANCE ENT2ANCE EXIT OU'I'LE'P INLE'f APPROACli HN;ND JUNC'I'ION
PIPE PIPE MANNING'S OUTLET INLET PIPE FLOW VGLOCITY TNLWATER FRICTION HGL FlEAP HEAD CON'PROI. CONTROI. VELOCITV HBAU HEAU HF;ADWATF:It
PRU\i 'f(1 I+LOW I.P:NG'fH DIA. n ELEVATION EI,EVATION AREA VELOCITY HEAD GLGVATION I,OSS F.I.EVA'PION LO55 I.OSS ELEVATION b:I,M:VATION HF.AD LOSS LOtiti F:I.F:VO.'I'ION
C8 CU (CIrS (NN;E'1') QIV) VALUN; (HN'6'P (MN:N'll) (S FP (KI'/tiH;C) (FF.F,T) (FN:E'f (NN;N"1) Q+N:N:I'1 (h'�:N:7') (FN:N:'1) (N'BN:'11 (N'N:6'T) (F�E"f) (FEE'f) I���T) (FEE"1'1 NIDI EL
(lU"f I 326 ti 12 0.012 170.00 18111 099 A.IS Q27 ISI.UO 0.04 18221 O.Il Q27 B2til 181.6J 027 OAO OAO IR134 IStiAO
I 32ti 40 I? 0.012 18L21 184.U1 U.79 7.15 027 182JA 026 I85.01 0.13 027 IBS.AI 185,33 027 0.13 OAO 165.?8 133A0
' ? 3,26 62 12 0.012 18A.01 184.ti2 0.'79 4J5 027 185.28 0.A4 185.72 U.13 027 186J2 185,9i 0.?7 0,19 0,00 136.04 ISSAO
t �I 3.2ti 212 I: 0,01: 1tl4,62 lYti.19 0.79 4.15 02'/ 186,04 L5U 197.19 0.17 0.27 197.59 197.52 027 OJ2 0.00 197.65 �0�_'.77 '�
q i 32ti 73 12 0.012 196.19 196.72 0.79 4,15 0.27 197b5 0.52 198.16 0.13 0.27 198.Sti 196,07 0,27 0.38 0.00 193.67 ?0156
I 5 CR SA 126 32 12 0.012 19tiJ2 196.Sti 0J9 4.15 0.27 198,ti7 0.?3 198.90 0.13 027 1993U 197.92 027 038 0.00 149A0 �01.�6 �
J o 326 41 1? 0.012 196.19 199.10 OJ9 4.15 0.27 197.65 0.29 200.10 0.13 027 200.50 200.42 027 0.38 0.00 200.G1 203.ia
5 7 1 Zfi 47 12 OAl2 199.10 201A5 OJ9 q.15 0.?7 ?00.61 033 ?0?.45 0.13 027 202.85 202J8 027 0.19 0.00 ?0?J7 '_'OJJ6
7 R l�.6 120 12 OAl2 201.45 207.93 OJ9 4.15 027 ?02.77 0.85 208.93 0.13 027 209.33 ?09.26 027 0.13 0.00 209.?0 2I I.01
R 7 ]26 31 12 0.012 207.93 210.41 OJ9 4.15 027 ?0920 022 211.41 OJ3 Q27 211.81 211.77 027 Q!3 OAO ?il.ti3 ?UJS
�� 10 12E 90 12 0.012 210AI 212.80 OJ9 4.15 027 211.ti6 Q21 2U.80 0.13 027 211.20 2LI.1? 027 0.19 0.00 ?IiJ? 21ti 12
VI. SPECIAL REPORTS AND STtiDIES
A. Preliminary Geotechnical Evaluation and Preliminary
Coal Mine Hazard Assessment
By: Icicle Creek Engineers, Inc. Dated: May 28, 2003
Core Design,Inc. Cherie Lane Page 16
i�v,y�ie�-r� p�'-'�..T,�T^"a"(�,yy..+�r,r"�'..;o,.`�+"_°�"'+.'3�?�''7�545?T' �sr. .T,�X ,e�� +t�' :cs�-rsre.—.�aqj.r,Y,^aFrr*.� r'� . .:.. r -�-s
,.�..�.sv .�-:,- , ..._s ...-.- :.. .'. .'�. -�_:-� � .n:: d.i�.0 ,_� �-'aF` wL��.` _.� ��f' ..
. .. . .. _ . .�.. � ;-� . � n Si. � :,�. ...r,.Y�.Gr' . -r:.., .�a..�'' �;p,+c"�
-'. �
A
■
�
Report
, Preliminary Geotechnical Evaluation and
Preliminary Coal Mine Hazard Assessment
Proposed Land Development
� King County Tas Lot 2923059123
Renton, Washington
a
- May 28, 2Q03
I
!
�
�
i
Prepared For:
Peter Gannon
_ Prepared By:
Icicle Creek Engineers, Inc.
Project No. 0464-001
�'-F-'c-rg- p.t�s-� �r�-�-z*x*.�z�' �,-^ .�-.-..A�^„� �'T',v�,
-.,.. -�,; . _.
: _, _ . .
-
. . i .. y _..:,,- _. _�:.^ --�- .i.. :-:.-.,: s�_''r:._:�. - i _ �'3 -= ::K '',`r� +�"';: '�'^"�`�`'�'e
�.}�,; .
4 - -
' 7 :—t j '_ i--i �� �i
` J_ J ._ ..� .� ,'�1 .L �i. .� � _
� V�92a � fi�9 � 1� �$ �
� __..-_�l".�.' . =_�IrG�C c.,._ `_. ,'IrD(If�'B!lia. _?.'I�o_ .
�
Nlav 28, 200�
�
Peter Gannon
c/o Steve Beck
� John L. Scott Real Estate
�735 NE 4`h Street
Renton, Washington 980�9
�
Report
Preliminary Geotechnical Evaluation and
� Coa1l�Iine Hazard Assessment
Proposed Land Development
King County TaY Lot 29230591�3
� Renton, Washington
File No. 0464-001
� IN'i'RODti CTION
This report summarizes Icicle Creek Engineers (ICE) preliminary geotechnical evaluation and
�
preliminary coal mine hazard assessment for King County Tax Lot 2923059123 in Renton,Washington. Our
services��ere completed in general accordance with our Confirming Agreement dated October 11,2002 and
were authorized by Peter Gannon on April 1,2003. King County Tax Lot 2923059123 is an approximately�
j acre land parcel located south of the intersection of South 34`�Street and Wells Avenue South. The properiy is
sho�vn relati�e to nearby physical features on the Vicinity IVIap, Fi�ure 1.
��-e understand that development of the property is being considered. The specific type of
� development is not known at this time, but the conceptua] project plan includes development of singie- or
multi-family residential lots with associated access roads and utilities. Specific details regarding property
� development,such as the layout of roads and utilities, are not known at this time.
The property is in an area where historic under�ound coal mining has occuned. �1r. Gannon
requested that ICE evaluate these potential hazards associated with the underground coal mines,and provide a ,
? preliminary geotechnical evaluation of building foundation considerations and drainage issues associated with
� site development.
� SCOPE OF SERVICES
GENER�,L
The purpose of our services was to esplore subsurface soil/rock conditions and ground water
� conditions at the site as a basis for providing a preliminary geotechnical evaluation ofthe property. In addition,
a preliminary coal mine hazard assessment was conducted to evaluate past mining activities that might affect
site development. Our specific scope of sen�ices inciuded the following tasks: '
I
PRELTiVIINARY GEOTECH�YICAL EV_�I,LTATION
I • Esplore subsurface soil and ground water conditions by excavating five test pits in the general area where
development is proposed using a trackhoe.
• Provide preliminary recommendations for foundation support of residential type structures, including
� -�� 'IE �u io�r _� _�t ��-e `�' 3 i���c�a� ,',-A 980�7-2519 a �Nv�nv.icdec�eek2naineers.com • (425)427-8187 phone • l'�25j �21-�6_9 ra;:
r
�
Peter Gannon
May 28, 2003
Page 2
i
recommendations for shallow spread footings and evaluation of potential settlements.
• Provide preliminary recommendations for site drainage.
i
PRELI�tiIINARY COAL VIIi�iE HAZARD ASSESSME�iT
� • Review available mine records from the City of Renton, Washington State Department of Natural
Resources and our in-house technical library to evaivate the location of the mined-out areas,together with
L the depth of mining, thickness of zone mined and mining methods. This information was reviewed in
concert with ground surface topography at the property to evaluate surface expression or collapse of under-
a ound openings.
• Surface reconnaissance mapping to identify mine openings such as adits or airshafts, together with
I� stockpiles of mine rock or other areas in which the ori�nal ground surface was altered. In addition,we
noted surface topographic anomalies that might indicate collapse of undergound workings.
� a Provide our opinion as to the risk of future property damage related to historic coal mine workings.
STTE DESCRIPTION
1 GEOLOGIC S�TTING
� The surficial jeology at the site was mapped by the U.S.Geological Survey(CTSGS-D.R.Mullineaux,
"Geologic Map of the Renton Quadrangle,King Counry,Washington," 1965)as"Ground vloraine Deposits."
Ground Moraine Deposits are described by the USGS as consisting of an unsorted mixture of clay,silt,sand,
� and gravel,and is more commonly referred to as"Glacial Till." Glacial Till is typically is a dense condition as
a result of being overridden by up to 3,000 feet of glacial ice. However, disturbance of the surficial layer by
I wetting and drying, and bioturbation(root development and animal burrowing)usually forms a less compact
� and coherent soil referred to as"Weathered Soil." Bedrock has been mapped at the�round surface in the azea
of the propei-ty and is expected to occur at a shallow depth at the property. The bedrock consists of moderately
; I compact siltstone, sandst�ne and coal, and is referred to as the Renton formation.
I SL'RFACE CONDITIONS
Our surface reconnaissance ofthe property was completed on iv1ay 13,2003. The site is rectangular in
size, approximately 6�0 feet east-west and 335 feet north-south. The topography of the site and property
I boundaries are shown on the Site Plan, Figure 2.
The property is forested and undeveloped. The ground surface gently slopes upward to the east
property line at about a 1 to 2 percent grade in the west portion of the property then steepens to about a 5
percent grade in the east portion of the property.The property is forested with conifer(cedar)and deciduous
(cottonwood,cherry,willow and alder)trees with a dense understory of brush. The�-ound surface is"wet and
spong}�' in local areas in the central and west portion of the property;we understand that some of these areas
II are"wetlands"that have been mapped by others.
NIan-made features at the site consist of a fence that generally follows the perimeter of the property and
� a 6-foot deep open ditch that crosses the east-centra( portion of the property from north to south.
Adjacent properties include a relatively new residential subdivision to the east,rural residential to the
west and undeveloped,forested land to the north and south. The primary access point to the property is along
the north property line where Wells Avenue South abuts the property line.
We observed a linear trough along with several closed depressions measuring about 10 to 15 feet wide
and � to 8 feet deep in the southwest corner of the property where an abandoned underground coal mine is
known to exist. Some of these depressions contained standing water and are likely"sinkholes"caused by the
collapse of abandoned underground coal mines or improper(y backfilled mine openings. We did.not observe
any topographic depressions elsewhere on the property or other ground surface irregularities that may be
Icicle Creek Enginezrs 046�4001/052803
Peter Gannon
May 28, 2003
Page 3
associated with underground coal mine collapse. Fragments of coal and rock were observed on the surface in
Lthe southwest portion of the property; generally in the vicinity of the previously described sinkholes. This
material is likely associated with waste rock and overburden that was remo�ed from the mine and is referred to
as "Nline Rock Fill."
SUBSL`I2FACE CONDITIONS
I Subsurface conditions at the subject property were explored by excavating five test pits(TP-1 through
LTP-�) at the locations shown on Figure 2. The test pits were excavated on May 13, 2003 to depths ranging
from 7.5 to 9 feet using a Komatsu PC 120 trackhoe. The test pit excavations were continuously monitored by
� a geological engineer from ICE who examined and classified the soils encountered, observed groundwater
conditions and prepared a detailed log of each test pit. An explanation for the test pit logs is presented in
Figure 3. The logs of the test pits are presented in Figure 4.
� Our explorations encountered relatively consistent soil conditions across the site,generally consistent
with regional mapping conducted by the USGS. However, the western portion of the property may likeiy
contain shallow bedrock(Renton formation).
� At all the test pit locations, a 3-to 6-inch layer of"Forest Duff and Topsoil"was encountered at the
surface, consisting of soft silt,decayed organic material and abundant roots. Underlying the Forest Duff and
Topsoil in Test Pits TP-1, TP-2, TP-4 and TP-5, we observed 2 to 3'/2 feet of Weathered Soil jenerally I
' consisting of loose to medium dense silty sand with gravel and occasional roots. linderlying the Weathered
� Soil these test pits encountered Glacial Till consisting of inedium dense to dense silty sand ��ith eravel and
occasional cohbles,grading to very dense at 7 to 8-1/2 feet.In Test Pits TP-4 and TP-5, 1-to-2 inch fragments
� of siltstone and sandstone were encountered at depths of 8 to 8-1/2 feet,as well as 1/4-ta1/2 inch fragments of
coal. In Test Pit TP-5,a layer of stiff to very stiff silt with a trace of sand was encountered at a depth of 2.5 to
3.5 feet.
� Underiying the Forest Duff and Topsoil in Test Pit TP-3 we encountered 2'/z feet of Weathered Soil.
Underlving the Weathered Soil the test pit encountered highly weathered siltstone(Renton formarion bedrock)
to a depth of about 7'/z feet. The highly weathered bedrock consisted of stiff to very stiff silt with a trace of
� sand. At about 7'/z feet, the highly weathered bedrock graded to a moderately weathered siltstone. The
moderately weathered bedrock was moderately dif�icult to excavate and becarne more difficult to dig at the
, I completion depth of the Test Pit TP-3 at 8 feet.
Very slow seepage of ground water was encountered at the interface between the Weathered Soil and
the underlying native soils(Glacial Till or weathered bedrock)in Test Pits TP-1,TP-2,TP-3,and TP-4(depth
� of about 3 to 4 feet). No ground water seepage was observed in Test Pit TP-5. We expect this shallow�-ound
water to be reflective of"perched" ground water conditions (poor drainage) and likely dries out by late
summer.
( No vline Rock Fill(coai and rock fragments)was encountered in our test pit explorations. However,
we expect Mine Rock Fill to occur on the surface in the southwest portion of the property where an abandoned
underground coal mine and prospect(described later in this report)is present.
GENERAL DESCRIPTION OF AA7.ARnS ASSOCIATED WITH COAL MINES
The principal physical hazards associated with abandoned coal mines include the following:
• Sinkholes(High Coal Mine Hazard Areas)
• Regional ground subsidence (Medium Coal Mine Hazard Areas)
• Non-affected areas (Low Coal Ivline Hazard Areas)
Icicle Creek Engineers 046d001r'0�2803
a
Peter Gannon
Iv1av?8, 200�
■
Page 4
Tl�e Renton�Iunicipal Code Title IV Development Regulations defines coal mine hazards as follows:
■
High Coal Mine Aazard-Areas with abandoned and improperly sealed mine openings and areas underlain
by mine workings shallower than two hundred feet(200') in depth for steeply dipping seams, or shallower
thcm ffteen (IS) times the thickness of the seam fof• tivorkings for gently dipping seams. These areas may be
� affected by collapse or other subsidence.
Vledium Coal Mine Hazards—Areas where the mine�vorkings a�•e deeper than t�vo hundred feet i?00 j jor
steeply dipping seams, or deeper than fifteen (I S) times the thickness of the seam for gently dipping seams.
� These areas may be affected by subsidence.
Low Coal Mine Hazards—Areas with no known mine workings and no predicted subsidence. While no
mines are known in these areas, undocumented mining is known to have occurred.
�
ABAI�TDONED UNDERGROUND COAL MINING
GENER�L
■ ICE reviewed documents and obtained historic aerial photographs of the site to aid in our�eologic
reconnaissance and evaluation or historic coal mininQ in this area. These documents and photo�raphs are
referenced as follows:
� • Momson Knudsen,January 198�,"EnQineerin�ti Invest;aation for the Ren[on, lVasliington Area."prepared
for the U.S. Department of Agricuiture, Office or Surface Vlining.
s Walker&Associates, Inc.; 1936 and 1947, historical aerial photographs of the subject prope:h area.
d • Warren, W.C., Norbisrath, H., Grivetti,R.M., and Brown, S.P., 194�, "Preliminary Geologic Nlap and
Brief Description of the Coal Fields of King County, Washington,"United States Geological Surve��. 1
� plate.
� s Washington State Department ofNatural Resources, 19�2, I934 through 1938, 1940, 1942 through 1948,
historic coal mine maps of the Springbrook area mines including surface features and underb ound mine
workings.
� • Washington State Department of Natural Resources, undated, "Summary of Coal Production in KinQ
Countv, Washington," bv mine and vear from 1388 throush 1967, 1 plate.
� INF�RNL=�TION REVIEVV �
� Based on our review of available information referenced previously,one abandoned underground coal
mine and one "Prospect" underlie the property. This mine was called the "J & J Mine" and the unnamed
Prospect appears to be closely related to the J & J Mine by the close proximity of each opening to these
workings as shown on the Abandoned Underground Coal Mine Map, Figure 5. The J & J iVline and,
� presumably, tbe Prospect, were active in the 1930s. The J & J Mine was considered a small, "backyard"
operation compared with the other large coal mines in the Renton area such as the nearby Renton Mine and the
� Springbrook Mines. However, even for the small mines during the 1930s, the operators were required to
submit production records and mine maps to the Washington State Mine Inspectors O�ce in order to market
their coal. For this reason, the historical mine records that we reviewed appeared to be relatively detailed
� showing elevations,areas mined out,inclination ofthe coal seam and other mining-related features typical ofa
well-documented mining operation.
The J & J Mine was developed by opening a"slope" down the coal seam that served as the main
ihaulageway for coal to the surface. From the main haulageway,"chutes"(or tunnels)were driven up the coal
seam towaxd the ground surface. These chutes were then connected by a series of"cross-cuts"(tunnels that
connect the chutes). This type of mining is refened to as"room-and-pillar" mining. Upon retreat from the
mine,the pillars of coal bet��een the chutes and cross-cuts were removed(called"pillaz-robbing"�to maximize
the removal of coal from the mine. The effect of pi llar-robbing was to dramatically destabilize the mined-out
Icicle Creek Engineers 046d001;0�?803
�
Peter Gannon
Vlay 28, 2003
s
Page 5
area,therefore, natural collapse("room caving")of the mine usually occurred within a few weeks or years in
� the areas where the pillazs were removed.
The J&J Mine was relatrvely sma(1 and all the underground wor(�ings were less than 100 feet below
� the b ound surface. The main opening to the J&J Mine is located in the southwest corner of the site as shown
on Fiwre 5.
The Prospect appears to be a single slope driven underground with two side tunnels. This �
� confiQuration of underground"tunneling" is consistent with"prospecting"a particular layer of coal and was
subsequently abandoned. The location of the Prospect is shown on Figure �.
HISTORICAL AERIAL PHOTOGRAPH REVIEW
a 1936 Aerial Photograph
The 1936 aerial photograph(approximate scale 1 inch= 1,200 feet)shows a single-lane gravel road
extending east from Talbot Road South to the southwest corner of the property. Where the road ends on the
a property, there appears to be a cleared area in the vicinity of the historical map location of the main mine
opening for ihe J& J Mine. The remainder of the property is undeveloped and forested.
The surrounding properties are generally forested and undeveloped with the exception of scattered
� rural residential development and some mining activities associated with other nearby known coat mines.
1947 Aerial Photograph
a The 1947 aerial photograph(approximate scale 1 inch = 1,000 feet)shows the entire property to be j
forested. The�ravel road in the 1936 aerial photograph and ihe cleared area in the southwest corner of the
� property are no longer visible. The west portion of the�ravel road estending east from Talbot Road South is
'� visible but ends about 200 feet short of the property where it appears that another historical coal mine on the
property west of the subject properiy is the primary area of active coal mining.
� The surrounding properties are generally similar in character as the 1936 aerial photograph. However,
the area to the south of the subject property is cleared with a home site in the east end and pastureland in the
� center and west portion.
UNDOCL1biENTED MINING
� Any area where historic mining is documented is also an area where undocumented mining could have
occurred. The primary reason for this is that some of these mines were operated in the 1940s when the value of
coal was low and documentation o�'mine workings was deemed unnecessary because of cost. The best method
to evaluate for undocumented mining is to review historical aerial photographs(previously discussed in this
, report). The historical aerial photographs can show surface features, such as coal stockpiles, mining access
roads or buildings that could be associated with undocumented mining. Based on our review of the historical
aerial photographs, no undocumented mining occurred within the subject property.
■
ANALYSIS OF COAL MINE HAZARDS
1 I3igh Coal iVline Hazard Areas
The J & J Mine and the Prospect are less than 100 feet below the ground surface at the subject
property. Therefore, without understanding more about the collapse status of these mines (by subsurface
1 eYploration),the entire area underlain by underground mine workings should be considered a High Coal Mine
Hazard Area as shown on the Coal Mine Hazards Map, Figure 6.
�
fIcicle Creek Engineers 0�64001i052803
a
Peter Gannon
May 28, 2003
.
Page 6
Nledium Coal Vline Hazard Areas
■
All potential Nledium Coal Mine Hazard Areas are included within the High Coal Mine Hazard Area
at the subject property.
� Low Coal Mine Hazard Areas
No known undocumented coal mining occurred within the subject property based on review of
historical mine maps and historical aerial photographs and anecdotal reports. No Low Coal Mine Hazard
� Areas exist within the subject property.
CONCLUSIONS AND RECOMIVIENDATIONS
� P�2ELIlVIINARY GEOTECHIVICAL EVALUATION
General
� It is our opinion that subsurface conditions at the site are considered satisfactory for development.
Based on the results of our expIorations,it appears that the majority of the site soils or bedrock will be suitable
for suppon of conventional spread footings. Bedrock underlies the site at a relatively shallow depth(less than
� 5 feet belo�v the ground surface in the west portion of the property). The bedrock can be difficult to excavate
� in cuts more than 8 feet deep and may require mechanical splitting or blasting to loosen. The su�cial soils are
fine-�ained or possess a relatively hi�h fines(silt and clay)content. These soils aze water-sensitive and are
very difficult or impossible to compact when wet. We recommend that the earthwork portions ot the project be
� completed during the drier summer months to minimize gading costs.
Foundations
• Footings for the structures should be founded on medium dense to very dense or medium stiffto stiff
soils. Where loose or soft soils exist at foundation grades,the footing subgrade should be overexcavated and
� replaced with compacted granular siructural fill for footing support.The depth of embedment below the lowest
adjacent finished grade for all exterior and interior footings should be at least 18 inches and 12 inches,
� respectively. We recommend a footing width of at least 16 inches for continuous wall footings and 18 inches
for iso(ated column footings. For footings designed and constructed according to the above criteria, we
recommend an ailowable bearing pressure of 2000 pounds per square foot. This value applies to the total of alI
dead plus long-term live loads, exclusive of the weight of the footing and any overlying backfill. This value
� may be increased by one-third when considering wind or seismic loads.
We estimate that spread footings and supporting loads normally associated with residential structures
founded as recommended will esperience settlement of Y inch or less. These settlements are expected to occur
� rapidly as loads are applied.
Bedrock Excavation
■ It is our opinion that minor grading(to a depth of 8 feet below the ground surface)of the bedrock can
be accomplished without difficulty using conventional heavy earthmoving equipment. A Komatsu PC 120 was
� used to excavate the test pits for this study and is considered a moderately large excavator. This type of
bedrocic (sedimentary rock—siltstone and sandstone)typically increases in "hardness"with depth(below a
depth of 8 feet), or may contain layers at a shallo�ver depth that may require (oosening with a mechanical
� splitter or blasting to remove the bedrock.
� Erosion Control and Drainage Considerations
The surficial soils on the site have a high potential for erosion when disturbed by construction
activrties. Erosion control measures should be implemented prior to the start of srte preparat�on, mcluding
fIcicle Creek Engineers 0464001/05280.i
�
Peter Gannon
i�1ay 28, 2003
-
Page 7
proper control of surface water runoff, use of straw bales or appropriate geotextile filters and temporary
sedime�tation basins. Erosion control measures should comply with the guidelines of the appropriate
reQulatory agency.
� It is possible that ground water seepage may be encountered in cut areas required for roadways or
.
structural e�cavations. We anticipate that seepage may be adequately handled by French drains,installation af
open ditches or sloping to sumps and pumping the water out as necessary.
All a ading must be accomplished to avoid concentration of runoff onto natural slopes. We
„ recommend sloping the ground surface away from structures. Rcof downspouts must be tightlined to an
approved disposal area. Other surface runoff may be addressed by usin�swale drains, drainage ditches or
other drainage measures.
� We recommend that perimeter footing drains be installed adjacent to the outside footings of all
structures. These drains should consist of 4-inch perforated smooth-walled pipe bedded in at least 6 inches of
free-draining sand, sand and�avel or pea gravel,with the base of the pipe at the base ofthe adjacent footings.
■ The bedding should be enclosed within a non-woven geotextile fabric to prevent fines contamination from the
native soil. The pipe should be placed with the perforations down. The perforated pipe should be connected to
� a tightline collection system that discharges away from all developed areas. Roof drains on structures shoiild
be connected to a tightline collection and disposal system that is separate from the footing drain.
Perched water is relatively close to the surface in most areas, and will affect development
� considerations as follows:
°� � Grades should be kept as high as possible or raised in some areas to maintain dry subgrade.
' Basement construction is not recommended for any of the lots,although daylight basement construction is
� possible provided that adequate drainage is installed for subgrade walls.
i Some dewatering may be necessary during installation of utilities such as pumping from a sump within the
� trench excavation.
• French drains in local wet areas may be required during lot development.
� PRELIlVIINARY COAL 1VIINE HAZARD ASSESSMENT
Based on our review of available information, site observations, and analysis of coal mine hazards at
the subject property, we have developed the following conclusions:
� • The J&J N1ine and a Prospect underlie the southwest corner of the property at a depth of less than 100
feet as shown on Figure 5.
• The area underlain by the J&J Mine and Prospect are within a High Coal Mine Hazard area as shown on
� Figure 6.
• At the time our reconnaissance was completed, several sinkholes were observed in the High Coal Mine
Hazard area. The sinkholes are relatively shallow at this time and do not pose a safety hazard. Some of
� the sinkholes contain water that could be a hazard to small children. In our opinion,these sinkholes should
be filled with soil to reduce this hazard.
a It is possible that the 7&J Mine and the Prospect that underlie the property are completely collapsed. If
� this is the case, then portions or all of this azea could be suitable for unrestricted development. In order to
demonstrate complete collapse of the mines,an extensive drilling program would be required.However,
! there may be other land use restrictions,such as wetland areas,that may preclude this opportunity in some
t areas.
i Medium Coa] Mine Hazard Areas are already within areas identified as High Coal Mine Hazard Areas.
a
� a No Low Coal 1�1ine Hazard Areas were identified within the property as there is no known undocumented
mininQ.
� Iciclz � reek Enoineers 046�1001i05?303
a
Peter Gannon
May 28, 2003
Page 8
r
� Mine Rock Fill was observed on the surface in the southwest portion of the property within the High Coal
� Mine Hazard Area as shown on Figure 6. However, it is possible that IV1ine Rock Fill could be
encountered in other areas of the property especially near the High Coal �tine Haza:d Area. Normally,
Vline Rock Fill is not suitable for building foundation support. Any Mine Rock Fill encountered during
� site development should be evaluated by a geotechnical engineer. Mine Rock Fill containing more than 20
percent by weight unoxidized coal should not be used for foundation support of buildings. If building
development in these areas is desired, then the Mine Rock Fill should be removed from the building
� development area.
o No specific design and construction mitigations are recommended as no development should be planned in
the Hiah Coal Mine Hazard Area unless subsurface eYploration can show that the underground coal mines
■ are fully collapsed. All structures should be setback at least 1� feet from the High Coal Mine Hazard
Area.
v LTSE OF THIS REPORT
We llave prepared this report for use by Peter Gannon. The data and report should be provided to
� prospective contractors for their biddin�or estimating purposes,but our report,conclusions and interpretations
should not be construed as a warranty of the subsurface conditions.
The project design details are not known at the time of preparation of this report. As your design
� develops,we expect that additional consultation will be necessary to provide for modification or adaptation of
our recommendations. '
VVhen the design has been finalized, we recommend that the final desio and specifications be
� reviewed by our firm to see that our recommendations have been interpreted and implemented as intended.
The scope of our services does not include services related to construction safety precautions and our
recommendations are not intended to direct the contractor's methods, techniques, sequences or procedures,
I�I � except as specifically described i� our report for consideration in design.
There are possible variations in subsurface conditions between the explorations and also with time. _a
� contingency for unanticipated conditions should be included in the budget and schedule. Sufficient
monitoring, testing and consultation by our firm should be provided during construction to confrm that the
conditions encountered are consistent witt�those indicated by the explorations,to provide recommendations for
, � design changes should the conditions revealed during the work differ from those anticipated,and to evaluate
whether or not earthwork and foundation installation activities comply with contract plans and specifications.
Within the limitations of scope,schedule and budget,our services have been executed in accordance
� with generally accepted practices in this area at the time the report was prepared. No other conditions,express
or implied, should be understood.
The conclusions and recommendations in this report should be applied in their entirety. We are
( available to review the final design and specifications to see that our recommendations are properly
� interpreted. If there are any questions concerning this report or if we can provide additional services,please
call.
�
********************
I
I
Icicle Creek Engineers 046a001;'OS?803
s
Peter Gannon
May 28, 2003
Page 9
s
We trust this report meets your present needs. Please call if you have any questions concerning this
report.
� __,- . .\\ - -- -
/� '
�' ��i �. .� '< ; �� Yours very truly,
� s
���'� / ��. ` Icicle Creek Engineers, Inc.
,,
i ,f`! ,�.k�..,�,�- - �,� ,r�� - _.
� , C+'
����_':V ��''. , _� -- � •- `{ . •�1; ' . �J/•
'1 ��- i I� � � • \
. ." - �. � ..cF .'k� ' �' ��fV1�)�f ,
� ��:i' �:� �.) - ..i,/ ' Y/I[i L�
i ... H. � A�•,'?7�J3�-'1 a' -
� ' ' �'' `"�� rian R. Beaman, P.E., L.G.
.,i. 'i�T , .
.,. .
- '' � -r �- ' Principal Engineer/Geologist
� ��� .. .. ..sr�.. . /'_ . . '-_ _�([
i ---- - - �- -� � .� LS�._.`.l.7.'-� � I'� .
_--.,..__._._,.,_._.::_�__.: -_:—,.,�,_....-_...._�
1 Document ID:0464001.REP.doc
Attachments
� Three copies submitted ��I
�
�
�
�
�
�
�
�
�
!
� Icicl� Cre�k Enginezrs 046d001;�0��803
M
0
� r �� �� •�A� � .�� � q ;� �Phi1Lp Amold :.-r_'l" � ;-� `��`��
�n _ � � fy� , �r l { 7atk �i-'�r•. ti�-_� � T �\
� . .. +� A _�' B�~ � i lu �t-Y---Kr J77 1�_ � r� _ - � `� ���R � ��
L�
ap �� '�- ��, ,r . Pcwer' � � ' � �� �' N •-�� �`�V � r �,�-t\�
� � '� �-� ''� _ , � Flant' � -�, y _r- �--- 1. __ ` .
`'�� i � -� i � ` �I � �--� `r1 \� .1:
`>WAy�� �� � � i�.v '�: 'J r "�u6st�tiory_ -i. �� f: • ��
�„" .--�.�� /r`y� -�- S � � 1t i-�'-1 ��. . +;._ , .�;�pi�/'
�l. -r ��i,f "' ��' ��_,... " � r \ 'j i �}� -�.J___ / .-�'� ;i, t�j ' ', � � ~ ` �i, �
. : ':���J�¢- � . i � '.�s._.�l�,�:�1 .4��.� � - .--� ���.� !�,r'("\ �� _ -a��`�'�� ' ` . �.,', �./ /�
�"r�..a::--=<-���--��"'.`��-.' i .� i�\ 1� , �� � . S�Ho4 . �` '.��i J.� \ \ `� .� '�:�`� `\,, ` .'
■ s �,1 � .`,.�8 7,l r'_ �Ir�.�`'' ��; 1t _�i 1 _,,�\ ���� _ �`o�\ �
�-=_ '' - ����,i1� ' ,; '� �i,1� ��`;�V "' i''� �``��/\,�. � I� _ ��
— � • � { 20 ;� ^ wZ .� ��-. ,.. ` „
�� � ' '- � �
-ubsta �.�,. , ��.j� � �/ oU+n � � ,� ,
� - � � . 3,� i' ! ,-�-��� t �o t � ,� , ,; �;�, � �'_�.�\ . �� ; ��� �`; �� .�. .�i
� '7. . �t� L �� ' � ,� 1 '� . 1 f� �' fj,�\ \��'. � ~/�%��r. . 'Jti�
��� i . 1 �� t . . ' \ � V "/ t J \ � ��� ..�'I
. _ — , � , �; ��t�,, s�( �__._,.,�`— y,� __�-._,��,,, y — ,, �� `—, ,
� �—'� i ���.' � ` ' , ;' f, r�`�i-+ti� �`� � �TitFanl1�=� � •, ?
� :�� � � �j i�` i � t : �� � ,K--�-v�� ��, /� t \'ti' vyrtc. �--�� \ �o��'` X
- 7 t'�� 5 �� 1 . � ;r_� i. � t .� .. �_Aa(�EC�UC �"`� .
1 � ���` � : '; �(^"''i : .�/ / .l �. T � i
1� � �. ' li . .��: '� f
v—, 1 � �f�. � . T�,/"`i�`���' r� , � i - �\ { '�'�. � 5. f�./!� � �f���"=.
■ � � �!�� � - ��.�1 r . �_ J� �� � � � � , , l �.; _ ,
�__ _ � _ Ta4o� ` ^ fio�br��'� �, ;�i "�� '� {:� ,� '�` � � +
, _ _ '�'albot ,� � � � � � �,�� 1.
i _ I ��
� � � � .' . \ � �
- - 1.
; � - _;� 'Sf1�����ill �.�' . �-.--r'I% i t •J �Sc6. f i i '�.� i ��. 11
, �- -f - ` t`, Park `i. ���� -�� '�---, ` �- _ `�\-.� .�.
. -�.�'� ��f . . /`� 1
. I�- . - / .r.
I'-
_ ���.' + , �
� __�F �;.. � ��� f T� :q � ���
� : • • '' �{ .� ,� ,t� . . � `� � � •� i S ��� � � , ! �
� -::. '- � � 4�l '' q� i�J;` �+' ; i � �s ; , ���r; ,
�� � j ✓ -r; , i � � ' �i � } � � �= -„
J''� "� '� _ <i � � �t �� � ��.. j! ' �r �, � /�-� �I
� � { - ; � ���`'�t� � /�. �-�� �il��. �✓Ir. F\' � � ��. i .� �� -,' � �i� � � � ,I '�'-�__.��... �
■ j _ i `�;.i l'��`� ,1 ` ' ' ;I � ' � '' � ` � _ �;- ! , �j , ��, .;�
; � - :� , �v t t . ,.; ` n � ;`•. � � . j � � a i� �.
� � .� ;, � --��� ��;- �.'�' Pro'e�t Site ` � � < i ; ; i �� - �; �
` � ,l� � : ► , .�� ' � �..# i � f - :� ,
i ; �i� � ` � ,; : '�; `�,'' ` ; ,�.i.�',.� � t } � t� ; '�� �: .�I.
`� � �° '- P'ark + i• � ! t t �� ; 1� i
��; �� r�� ���s ti� ' �` `�� � S/ � � � � i � t i�. �o�
.�r_,� / ��� 1� � � :� { i i, ` �- �,�-1i
i . � . �r ��. _ 'y;� i i . \ _� �r'�C
� � - - �_ � � . ! � �i � � ,l i � �� i
-`� . _ _�#� f� `���.�.,��� . � .��i.,_�__ ��� �7 1 i, y----� � �� �f/�"✓R ;/
� �t �A ' � �� l 1���. '� � �� sF �—:- ' �a�
` �! �1� c �' �.; � _. ..,.f: ��.i ,'y,r..
��� � �9 ' f '-�i � � ] '` I i 1 •r-t r-� -.;� .. .t�. � ' ` ._ .�' 7-`___-.
� ,�� � s y. _r '-4 -� i� �-`"� t'I; L� �j i �i i \ �• � .'a. l \ �J,
1 ; TtD��Hos � 1 1 � `'• r,��f i ,� ii i } � :"! i �� � i,�
� � i 1�� R i f ' . ' �\� /'/�/
� �, ������ '� � ? ,y-�� �v ;^-+, 1 �t �s iBeneon hi�il � .•Y:��� ' -��J ` �� fJ,
�_ 1?"� � F 3 Co6h�, ;�fa1~�° l�!�. r�i� '� �' `-_, .' ' ( '.i.�� 'i.,' ; .�,:,��*'L .`3n �� !I�
---� :co� -_ �'H-D- .;�+ ' �/��� `r�.��a�i^:/? .--a'�.,� j f ;� 4 �`^�� , \ c/"� i;
� � - ) � � � ¢D !. :��z+ �y � t j � � � "�
, , ! , , � rs � - , � ,f / ,:
r � ;`.; �-- ;-.�'�� t�.,�- „ ' ' � :,--, � � _ j i
.�� � � ' � . I � `� �1 ,'l� � � r-' 1 r � - �), -ir
� I �1 � �� . � `l t,J �I� , ti�' � I � �� '� I�
._� �, It—"�_ �f i . v \ � ; ,:'' , / �� ..
� rL � �( . -. 1 ,�� , „3 � �
� � � t 4 • �o, r'7 ',A4o �ti��i �- .---{ ..1 �� , r "_-}' o �/� � �
:-
4 9 �1 ' ��, t l� �r1' * , �t , � ' /,-„�� 1�e ��' 't�.--.. }
� 1 � �i � �'I�� �i� �. na} � . - � ? , �_:, ,�_
p�o . ; Jr r`3 � ' �,� l: � is f• , 1 i �` - b ('� � �: � {
�P' �1 i� � .�: i \ .:3 f "`�`_ i.% �� 1 •o`�'/ i^`` 'i i
�i�� 6� t � , 1' � , 1 \ i� 4��-�1� \��♦}� ~��� , m�i�1 ���t� . .� - i
�. �1 1\ , `� ii ,;i 1 i, -t /',CN'1 �'• 0 3J ` `� i ! '
___ ,,T `i \ � :\ ��,{;- .� �_ti �- ( 'Mr �� �y; ,�v ,i ;—�.-i--,�
f � /
Subs�� � I �. -. �� ����i, ' i ' } � �S i- � � j'i Y' r +�---- � �; i ;
- ��� � f 1 ' �'V � �\ ,j szs ':::f,�� � � `•i� �� - r \�\� �;I�t'
`� . Y I ,!'/>> ,_''_.�.� i '; ��5, 'i t ` � i j
.. _ �� ��' ' , z }r i � r V • ' '•.�•'�•' � ` _ � �t�,�Jr�--�,1;:' _
� / i � i { i i``A,� � � : � '» •',. '• . •! _ �. '. +t a ;
�as�ro�o��iv�r�r�m�t�._:o�.�i I
I
N I
o Z,000 4,000 �
Scale in Feet
0
Q �
i
D
T
�
O
Z
v
; Icicle Creek Engineers Vicinity Map - Figure 1
. _-. � - � s-- � � � � � �
�__. ,.a No...-..,-.-001 BRB:05115103
�
m
�N
° D N
� 1 ` � 1 �� � \ C < f � �
'
j \ '-�� � �m
� ` `� ._..__ , �
, ..
� '� � -. . _
,\�„ , `. '
, _ _ _�.�
�. .r . _ l.�_. .��.... ....�.-�-t"�--�--�-�;y�".�.. _-�_�.�._r.�_... �� -r-��_ _..��' . :_.__..
-h�-j-y � I � ( � . 1 ,
� � P-1 � � ---__
! / TP=S..� ` . t
\
''� � , ,1 � � \ � ... +
__� T -3 ; � �� � � _� 1
.� , ., `
� \`,~ � .,� .. ..._....
` � C7
� \ � ``` \ C
_ _ _ � � ' __�� � , I
� r • 's ..�_.--...
I l , �'�� � �
, 1' .... �,..--- / P-4 � ,�..,
\�, _, TP 5 � :;.
1 �
,.
� r , � , -
, _.. � ,,
� \ 4 �.m„ .. � .� ::,.�..�.�.
� ,.
�w � � � . : �_
.. �y�,..__.+�� ,ur.ri....�+:�r ,_ - ` � \ � � . .� �
\ � \ � ,� �, � '
.\ �1 \� .'` . � 1 •�, ;> ) ' .`,� �`\�,;�
Gannon Property
Explanation
o �o0 20o TP-1
Scale in Feet �- Test Pit Location
Icicle Creek En ineers Site Plan - Fi ure 2
, Unified Soil Classification System
___.____ ______ _....__.. ____ . _____--------
r Soil Classification and �
j MAJOR DIVISIONS � Generalized Group �
� Description
� — ----------- _------------ -----------—'
� ------ --------GP-------
Coarse- GRAVEL GW Well-graded gravels
'� CLEAN GRAVEL
I G[ained �ore than 50/o -- � , Poody-graded gravels__'
Soils of coacse fiaction
■ retained on the GRAVEL WITH � GM Gravel and silt mixtures �
No.4 sieve ' F�� GC Gravel and clay mix�
-- - ---------------------- -------------
SAND SW � Weti_graded sand
� CLEANSAND
More tfian 504�, r� SP I Poody-graded sand---�
� More than 50% of coazse frnction ' SAND WITH I SM t Sand and silt mixtures '
retained on the passes the '—
1 No.200 sieve No.4 sieve ' FM� SC Sa�and clay mixtures
� Fine- ML Low-plasticity silts
Grained SILT AND CLAY' MORGANIC ---L-- -- -
ISoils ----- CL Low-plasticity clays
less lthan 0 ORGANIC � OL I Low plasicity organic silts �
1 , i � and ocganic clays
SILT AND CLAY t MH High-plasticity silts
INORGANIC ------------- --
! More than SO°/a ' CH ! HiglrplasYiciry clays�
+ passing the Liquid Limit , ORGANIC �OH High-piasticity oigamc silts i
i No.200 sieve greater than 50 and o anic cla s
Highly Organic Soils Primanly organic matter with organic odor � P"j' � Peat I�
— --- — ------- �— ----- �
� Notn:1)Soii ctassificatioe bued ou visual classification ot soil in gmaal accurdauce with ASTM D2488-90.
2)Soil classincation using labora�ory taKs is bascd oa ASTM D2487-90.
3)Dczcripdon of soil density or coosistmcy is based on intuprcrerion of blow co�mt dara and/or tat dat�
I
I
Soil Particle Size Definitions
IComponent Size Range
�Boulders ' Greater than 12 inch
Cobbles 3 inch to 12 inch
Soil Moisture Modifiers G��el 3�n�n co rro.a�a.7s�,�a�
— --- Coarse 3 inch to 3/4 ic�ch
Soil Moisture Description j Fine I 3/4 inch to No.4(4.78 uun)
Sand No.4(4.78 mm)to No.200 '
i Dry ; Absence of moisnue (0.074mm)
Moist ' Damp,but no visible.water CO�e ', No.4(4.78 mm)to No.10
(2.0 mm)
W� Vsibte water Medium ' No.10(2.0 mm)to No.40 '
--- -- ---- (0.42 mm)
i Fine tio.40(0.42 mm)to No.200
: (0.074 mm)
' Silt and Clay Less than No.200(0.074 mm) ',
Icicle Creek Engineers Soil Classification System - Figure 3
�
i
Depth Soil Group Test Pit Description(3)
lfeet)(1) Symbol(2)
� Test Pit TP-1 'I
Q.0-0.� Forest duff and topsoil ',
0.�-3.5 SIvI Mottled orange,gray and brown silty fine to medium SAND with gravel I
� (Ioose to medium dense,moist)(weathered soil)
3.5-7.5 SM Light brown silty fine to medium SAND with grave]and occasior;al cobbles
I (dense,moist)(glacial tiil)
� Grades to gray and very dense at 7.0 feet
I Test pit completed at 7.5 feet on OSi 13/03
Dismrbed soil sample obtained at approximately 5.0 feet
Slight caving of the test pit walls observed from 0 to 3.5 feet
Slow ground water seepage observed at 3.�feet
' I Test Pit TP-2
0.0-0.5 Forest duff and topsoil
0.5-4.0 SM Mottled orange,gray and brown silty fine to medium SAND with gravel
(loose to medium dense,moist)(weathered soil)
I I 4.0-8.0 SA�I Lignt�rayish-brown silty fine to medium SAND with gravel and
occasional cobbles(medium dense to dense,moist)(glacial till)
, Grades to gray and very dense at 7.5 feet
Test pit completed at 8.0 feet on OS/13/03
Disturbed soil sample obtained at approximately 5.0 feet
Slight caving oY the test pit walls observed from 0 to 4.0 feet
Slow ground water seepage observed at 4.0 feet
Test Pit TP-3
0.0-0.6 Forest duff and topsoil
0.6-3.0 SM Mottled orange,�ray and brown silty fine to medium SAND with
occasional gravel(loose to medium dense,moist)(weathered soi11
3.0-7S l�iL Mottled light orange and brown SILT with a trace of sand and occasional roots
(stiff to very stiff,moist)(highly weathered bedrock)
7.�-8.0 Bedrock Laminated light gray and dark gray SILTSTONE(hard,moist)
(Renton formation)(moderately weathered bedrock)
Test pit completed at 8.0 feet on OS/13iO3
Disturbed soil sample obtained at approximately 6.0 feet
Slow ground water seepage observed at 3.0 feet
Test Pit TP-4
Q.0-0.� Forest duff and topsoil
0.5-3.3 51�1 Mottled orange,gray and brown silty fine to medium SA�1D with gravel and
abundant roots(loose to medium dense,moist)(weathered soil)
3.8-9.0 SM Mottled light orange and brown silty fine to medium SAND with gravel,
occasionai cobbles and fragments of coal(medium dense to very dense,moist)
(glacial till)
Grades to gray and very dense with occasional fragments of bedrock at 8.5 feet
Test pit completed at 9.0 feet on 5/l3l03
Disturbed soil sample obtained at approximately 6.0 feet
Slight caving of the test pit walis observed from 0 to 4.0 feet
Slow ground water seepage observed at 3.5 to 4.0 feet
Pase 1 of?
Icicle Creek Engineers Test Pit Logs - Figure 4
_ _ __
�
I
Depch Soil Group Test Pit Description(3)
� (feet)(1) Sy2nbol(2)
Test Pit TP-�
0.0-0.3 Forest duff and topsoil
0.3-2.� S1�I Mottled orange,gray and brown silty fine to medium SAND with occasional
gravel and roots(loose to medium dense,moist)(weathered soil)
2.5-3.5 ;vIL Light grayish-brown SILT with a trace of sand(stiff to very stiff;moist)
3.5-9.0 SM Mottled orange and brown silty fine to medium SAND with gravel and
occasional cobbles(dense to very dense,moist)(glacial till)
Fragments of bedrock and coal from 8.0 to 8.5 feet
Grades to gray and very dense at 8.5 feet
Test pit completed at 9.0 feet on 5/13/03
Disturbed soil sample obtained at approximately 7.0 feet
Slight caving of the test pit wall observed from 0 to Z.5 feet
No ground water seepage observed
Notes:
(1) The depths on the test pit]ogs are shown in 0.1 foot increments,however these depths are based on approximate
measurements across the length of the test pit and should be considered accurate to 0.5 foot The depths are
relative to the adjacent ground surface.
(2) The soil group symbols are based on the Soil Classification System,Figure 3.
(3) The approximate test pit locarions are shown on the Site Plan,Figure 2.
Page 2 0 2 0464001.testpit ogs� 52803
' I
� ,
Icicle Creek Engineers Test Pit Logs - Figure 4
i
— .-- . .
D �No. )01 RB: 5/03
�
m
�y
° D N
c t �
r , � \� � \ `�. � , s = �
\ \' ` \ � _�_.. C r- --• �._-._.
�+'� _�4��•..-� _,..,,,�..-7.�„_r,�---_�--..�---_•-
C �� �
, � ���.___ �
1 ' � �
�� `�� � � �
� I 1 � _ �
� �
�. , � �
� .
�
> ��^. � ..�
� , ��._ � �___ _
���, � � 1 a �
_ __ .._�.�� � � � I
11 4 �!
, � , f ` �
�
�
.�..-�� � ! � .:
/ t , ,
PROSPECT � , � � `�
�, ; �, 1 �
� �. , , , , � i -�«��
f �, � � � �
� - ` ,�.
� � �V��-
� ,, ,� , ��,
,` � , \ ( i � ! � i � � '�� � l � \��
J & J MINE
� EXPLANATION
�yZ► Abandoned Coal Mine Opening
(filled and/or partially collapsed}
0 100 200 . The location of�bandoned underground mines is based on information
Scale in Feet obtained from the Washington State Department of Natural Resources,
"Coal Mine Map Collection,"Map K-34, Open File Report 94-7, and
Morrison Knudsen,"Engineering Invesligation for the Renton,Washington
Area,"January 1985)
Icicle Creek En ineers Abandoned �Jnderground Coal Mine Ma - Figure 5
�.�.���R.�..�,.�..�....- ----
. -- . - ..�-- - •a � � Ic.
h :No. )01 BRB:05/15/03
— �
m
�N
� ° Dm � I N
' \ `,.i , '`•..,, �'�.._,_...._, � � c +I I �
��. �.. � , � _.�Q.J .- 1 . • .
"�t��..�._�w"��_�.u�--r-�'�.y� ••�_�._'� r � .
-.---- -� .- � ___._
�f�W � �
1 1 _
1 �''�, 1', t
/ � � �, �� � ,
� , � � . _._
; . � � ,.
�. ,
�,� �. � .� �� � �
C � ��� • � �� �
, �--_ , �� �:� . ._ _
\ � 1 � � „ �..
, �
- _, 1 1 _-_-:' �` 1
/ � � ,� � �
, �, �. , �
_ � � � i �
1�. . l�� f� � 1 r�
, . ��-� � �
', � � � �__� � T,J.
, ; � �"�
:� , �-
J , �;
,� : , � I ` � �
' / ` 1
, . , .__. .
_ '' k} ts • � . -: ^tT � ..�iP�•. .af4� �+ :.�.
7 4 ��.
�-� �•�
..�_ ,.. � , �. ,�j., � '` �' �.�_� •
, �,.
�,; ...�. -
� , . , � , �."., - � ` ��� � � '�� �
\\ .�\ � �,\ ��. ,`�•`1
,� � \ ���. � �, ,� �l 1 �, '� 1 � .
EXPLANATION
� :� High Coal Mine Hazard Area
(no development unless subsurface exploration is completed to
� ��� 2�� ' evaluate the collapse status of the underground coal mines)
Scale in Feet
NOTE� All structures should be setback at least 15 feet
from the High Coal Mine Hazard Area
Icicle Creek En ineers Coal Mine Hazards Ma - Figure 6
V"II. OTHER PERYIITS
There are no permits associat��d �vith the Cherie Lane project at this time.
�,
C��re Design_Inc Cherie I..�nc Pa�c 17
VIII. ESC ANALYSIS AND DESIGN
A combination of Best Management Practices (BMP's) including a temporary sediment
control faciliry will be used for all disturbed areas to restrict sediment-laden runoff from
leaving the site. The permanent water quality/detention vault will be used for temporary �i
erosion and sedimentation control during construction. The temporary sediment facility ��
needs to have a minimum surface area based on the following equation (per KCSWDM,
1998 edition, pages D-28 to D-31): ,
SA=FS(QZ/Vs)
FS Factor of af = I
( S ery) 2 (recommended value)
Q2 (Dev 2-yr flow)=0.662cfs
VS=0.00096ftIs (recommended value)
SA = I,380sf
The permanent control structure will be used in lieu of a temporary riser (as allowed by
KCSWDM - Appendix D, pg. D-28).
A 1.508-in diameter, dewatering orifice will discharge the required flow based on 1,380sf
of pond surface area and 3.Sft of head(see page D-29 of the KCSWDM). In contrast, the
permanent orifice diameter designed for the control structure is only 0.77-in with 2.0 feet
of head and a surface area of 4,200sf(measured at the water quality elevation, 170.00}.
Using this comparison, there is no need for a temporary riser to obtain the required
sediment removal.
Core Design,Inc. Cherie Lane Page 18
IX. BOND QUANTITIES, FACILITY SUNIMARIES,AND
DECLARATION OF COVENANT
The Bond Quantity Worksheet and Stormwater Facility Summary Sheet are included on
the following pages. A Declaration of Covenant is not required since the storm drainage
faciliry will be made public and thus maintained by King County.
Core Design,Inc. Cherie Lane Page 19
X. OPERATION AND MAINTENANCE MANUAL
A maintenance and operations manual is not required since all drainage facilities will be
public.
;
�
� � �
+' ��
Core Design,Inc. Cherie Lane Page 20