HomeMy WebLinkAbout03292 - Technical Information Report - Storm Drainage Calculations 11�r�^ e�� 3z9 Z
)
STORM DRAINAGE
� CALCULATIONS
N
m FOR
THE M.B. SHORT PLAT
LOCATED AT THE
276 DUVALL AVENUE N.E. I
IN
RENTON, WASHINGTON �
DATE: OCTOBER 13, 2005
REVISED DECEMBER 2, 200�
REVISED JANUARY 12, 2006 !
. III
PREPARED BY. PITTMAN ENGINEERING �
12819 S.E. 38TH STREET #159 �,
BELLEVUE, WA. 98006 ',
(425) 562-7226 �'
PI�
� ��' �'�
� c�,p�tiVASf jt � �
�C `._:� `�G '�
� �P �a Q �
A'.� f�J ��..�': '�
. s' �.:..�y ` .
� �a��_ l . ... . :
� � �07�0� � JAt� 1 :, zQ�6
t? Fcrs:�
�`�'l:`.a'�IAI.��:`-�� ; .
— �^. _..�'
, EXP:RES 10/t4E � . . , ., .
3z9Z
NARRATIVE:
This project proposes to subdivide approximately 0.9 acres of land (39,800
square feet) into six single-family parcels. The site is located on the east
side of Duvall Avenue N.E at house number 276, in Renton, Washington.
Furthermore, it is located in the northwest quarter of Section 15, Township
23 North, Range 5 East, W.M. (See attached vicinity map.) I
The western portion of the site is relatively flat with a mild slope from west ��
to east. The eastern portion of the site is primarily a non-regulated Class 3 �
wetland of less than 5000 square feet and it will be filled. (See attached
USGS map.) The ground is comprised of overgrown grasses and a few trees
and there is an existing house at the southwest corner of the property. The
soils are Alderwood Gravelly Sandy Loam, which is considered to be a till
type of soil {See attached soils map.)
Stormwater will be conveyed to an underground vault located in the access
tract at the middle western portion of the site. The City of Renton
requirements dictate that a Level 2 threshold for this vault. Since less than
5000 square feet of new impervious surface subject to vehicular use is
proposed, water quality is not required.
�
;.-z. �.,:
�,,,�.,.,.."'� _._.._ .._ _....-« 4-. r.r-:�_.-.....-._..._..,..w- ._...�_.....,_. .. . . +'.+'4C�Rn.,.ww•+.R.'�M^+.}'.n""*.�.n.n.�.W
.�.. ..�.�,..�,w.+�....�...s..T.�...o- -,.«�+�.w+...�. . . .. :..-.-}�... ._..
...... . ...-.. . . . ..� � . . -
��..� �� i ' '': ... :. � .. . .. .
PU�E F,.:SOUND �
� SEE 657 MAP
L.►I : ��...,i.+4��-:�.��/ �- C�1 f+�„��r,.;,� ��.. . ,-.� .. � �t..`'.� , � " ��'�� 5
f� .-,.�. _ ..�.f... ,.. 4
,�y �'i�• �;. Yw.,.
�L� �3S AY�4[ I .. � N � 3S ld HLOST ���� y . � . °-Q ,. ... .., �. `.. . 1rb} �'l ' �"�d ax2sr~ l
''.. SI y.,�� . �r.
b N18bT ' "_ � �. y Ci 3S �, 64T a "`°Sd. � so����'lsts�d � """ 3s '�
nxnv a�in ld Hl r
1
� ��7e it � ��,` aozn w 3$ .ua 3S^ osr `' � .��C Sls
� s 3s ia e , Ab � '�
i � Hieb ti �o N16 , '�Q`':;�'�re � ��;�� ��4
i� 7u AY� � � �� �3SYs ld a � HLL4T •�• . . Y'd ) � o.'� 5i y
, r �,�� S 4 > >d yr € -,-_t-�,-,� {,:�; ��b0 °�f3� � °fl 3s nv xLeoz �„ �
� AV �H199t��" 'GLa,�< �3 3S ld ruv�i � � �zw 3"!d °� � � i°I q �' �� ..
�:, � � H f � ��. �^ n � 35 nr�r 0059t
� �� -� �� 3S AY H19bI �,, �} `�,��:� �v se� g H1LbI jy, {� C, 5E �
35 ld H196T "�� $.y'�`��� � �,a� C� ^ �rtH y'�3, t�nt� ;��0.'xP � � �?ni.. { �m
��"n �. j'�nnr aota.', �3 Ab OZ£I �SSI�-���i d.�;'� �3S AV N159i� �6� °' wJ q `�'� SE 3S AY H1561 y3$�v s¢ ti�o"�� ' '+�''.19aty�/ �.r� _�
`., �N�ia � N N1b6I x ]S AV N1bbT� G � ra� > >4z`�0 6 nr � b�e � � .�/ ; , �� a ,
� is nv
I 3S Atl ONZ�I.x n n . N G �OHBYI g � bl� 3rtat � M� � ��u»��3 > r 4rJ��` �„ � �
�I� 3M AV h WN[fl ,� as� W 1k � d Q2 .� _ 9, .�� � -Y yf
. I �,�I I � & � �3S V �£4S pN �. h���o ., � �°ucr��' °;�v � ���" ��'a�°� S u��� �+y
_�� '7�� � �G �� g 'Ji 3S V r Q . .'
f- �_,a.�,�n,�m��, �, w �' ��A SE Aq�, f isivt aN`s ��a� A � "';""�ta N ��� s� HlObt � Q �,,�3s �d� S ia3ao �° h s��- �
� ,� _ � e� , �rC��.- ^ a � � � nr oroa o o;�;r ��W� ,x
��-/'y-,�.�`��,. � " . I � C �, � 3S i "rt ;� �[ � �� '" z �,� Zb[ ,y4. 3g Y� � ._,��a �� F.,
vi ".a N�,�,�'� C/� � d� � G�. �fr � -�w'„ � w a .D 35 AY i P P � �'
�'; �3 Hl [ = 35�Atl �C i: �,a, �r�r � '„�' �6y�� 6- st 1S[bi � .,i p
M1tl a llVn(10) �' I ^� w w 139 A 5�. • � � r � `Z` h y�, e� �{ tri� � � x:
, ,�r�e r��HiB£ jS �-}___, �'y r, oioa[ 'y � < 3s idywcZ �ls v x or ,s,N � . „ .^K��, aY2u�2:?,-�! ^OOEIt �
�� � � H18£T o's � � . "� ti ` N a
��„� � LJ �, Pl SE ��SE H10bT m
,� N� =F- ��Pr-� `,` ` �rQhr O gs�d a�'6,� ' N � ���'.�f�e
' TM � .�(iN AY N012131f#}18). � `.,� '�N > - � ��c��/'=r� '.�,1 ,� ��5�*
., �$ . 5 0- t.� a � � ,y-�i H 1� '�' > f 3 S A o
Fs AV' ? H19EI - ' -� � , t �r' /�, � �,`a 3s, � Q �e H19Ei
F... s � � �. � a Y`�`� i s � �,, ; Z ru[ct � a 4er G �y �
� r NOl :;.:� vs nv d ,m-j �. '� �V � �u�, � H1 �'
�x';�. +`sn I� saa . ti�va"Y,ni .._'��j� :. I e �t �.., � '�k�eN��C '� 6 3Sld - y �dk[vE't"� �
r- vs i� � o, � - :� t rtu �s� Q � < �
. 1.. Mnui . . �k i . . . > et ti H1SEi
"' ,,, '' , _ � g t� � � �� I-��' '�
.�.�. a� ..._.....;_ _. . .. .. v�� .�e�mxr s`� �r� ,; 15er � yi � �s�° nv � '� ��� a "�134
nns rc Ee� ` ,,, N
e`� �a. ' v � �> °; n� `�`i ,� r
ty G(17 OOE ..{`i, �r U " .w .i , r % S�y ,. $ ..�4 S 7 S AV FLLbet �
' � ...^Y � �QYNR . � � t,yry �., . � �O�S�V in�c.i .,y �p ,: y t t�, ,y � ��'S HAhET� � � � "�o' 13 �PLdSE QNf£T� � ✓+ 7' tY/�
�1H Ab �Yl � F � `� 1�' , .. c 4 r��6 . ,.i �q f �� 3S d UN2¢S 1 00 `+ � �
� , a� 'NO'I ;^.�.��r�,�n r t�',, \/\ o,N,�,�bee 3s hy SE I68� �!'� s
� tN�nv 1N ld VWO�Vl u � l � �`�'( ,.� '14. ;�`'�� �dls r^ 3 d 1S EI � Q � �
w�t» � . n �.: �� �.� �� . .�� ""'�� , 'n r ti, .i I�I 6 3' a d' S . �n� 3.` '� 1'-� �
., .x� jn uilat»rK= i� yil ` � � � � '�,�s �'�� � a-' ; � � p�
.y
�""s t- ,1a r. r � s id Fuoet� s � 51°' �� , � � �p
u �,a M � � � � ,� �.s � W'_�ny S� x . ��ti� "ry � w w�'�~3S �� 3S AV � �a . I- � ���.
ri�o� � x
/lt/�• � N33f10 �S. - i ,��L�J - �: : �aSE r � H1oE e,� � N � H10£i Q ei�; w
�, . /(W BdI.' u, � ' � "�1 n�,. � i � � a1'z� „'nm o-��,. a v���as m rue � n� �c,,, ui
I�' $ � � 4 � ' "�3� ':+ �� , �-���=,1s��i6zt s ld 11182I oo99t � �3S r- AV H162i
X .
_ ; ,.
. ' '�a� a .. ' �, v-'. a /�� ,+y N,� .�,r .�,<<y OOZ T � 002LI
� �' `r � c� ',Y 2' �i z w�' V:� � ,G. J � � f.,s' " `',�� ' � 3S G o
..,
, � ;� w � z : � 4.. H r 3s nv � Niezt ,W N AV H1BZL ,
MY .� .c '' q � V ', . ... / �..:i s i..�,.w 1ERCE o_,s,,, ^ �-- �
� :�._. : ,,F� . .- .: �- . -- ' '.� �7" ��` . . - 1 � T ^ � H1LZl � � a:
�a a �` � �� �o � .P� I� •m ��� -�S eV q1.VMPIA A ;L � � � '� �tl H1L2I S`O �S�b �• � � N` ;
` _ . 5 ,�.I � .+*� _ -� v� � da 3s a � ti �. N SE 35 AV f�.
� �v�� wa rn t eP s. 5 y
'_.i� ,r,c �.t� . � � f. ` ,,S .�Y. L ti ..�rtad �i i� rusz� �I SE .. .[�at � G, HiLZt '.
� � JN 'W 2; :� ��' � ^� /z. U �� js � � �2 $A °'
� AV� , 30NN0 CO � ,h�;` i,�.� ��, � 1.vva�x ,�P� ` a P �',� �q 1N ^
R ' �� � ! ; � l� 30�6 � w h 192I � 5E�.--i H192L
, / y _ � : . 35 V H .
_ � � !.''� � � ,: �T � . � 'o�� "`�;� �.: ` „ '^ 0099I n) �� �'y�.
�.auv�r � �---- T �,,.A.�. . � / , . . ,., � `�F � � 94 ny� ��ti 3.r 3S AV H15ZT W� �
��`_:.nve y��,�� z u,j y .. ✓ 4r i ,.,,,i s/ ,�' � � �r.� N .�
I _ ,,, ._,_ _ ', ry . � ` ` : m..,•- � N�� r,,,'<s �� a�`18i,y ta"`;"4 w; anezi � "Hlnv 3S A H17dT �d I-
q �"" a5'�� .35-�? ,;+
I 3x�a S�y 3M Ab 1 1 G ~ a�:�� .� ��, nriviA t�r voo'� w�,.,� � " � _ ^' 1 ,�;
x�aNr � o � . •! N � N6 allE2t,o r w o w N ,
� ., � ��as �s + f� �� �" � 3s nv asal o
��,�� . 113t � „ . . ''`� . . t�l j �� �. N]m���f �.�.�'b � 3S A � ONZ2T ; 35 � �N ti � 5 ld fieG;
'Ir — '��3N � "'I � �, ' �`o- �" � �;�' ! 3i nv �i � f�oHzzi� '" 3S A ONlli �` ux�� � ONZZT
dtl %l�7Nt 1d X7iINI y . � �= ^�`� ,�, f �...��' 4+ '�`' J � ., �3S AY 1SSZS e "�
i �ii iv xn�wrwrr� . .V `,�� . �Y RM""�" �� tig� •o ��1 e, c�� c.��v iz� 1;I2I � N r,lsf24� �5t AV 5 35 AV 1SIZ ��� ..�., C.'
.�� •* � a. .�� Nfi t, �b�� V ,. � d 3 3$ Ab s r 35�Y 3S AVW�1�'��n �
I (�'.} O ,t�. ) �� s lOZT ' � ' S� --- 3S
H�r ev oin�a� /Y � cr .�""�. ..� �,toti �J '�,r��;:� ���� 1s�, � �tr `3k OOI9 'AY X102I'CJ` H10Z[ HiaZt'"
> �po)�� ��t9 ----. . .___ - � .;.; �� � �: �a ,�;.c �I .._J.,�. � � 3S Ab Hlfi T ��tet �� G 5 ti ``Y.-J�'• ��� �' .
� x ri`�/ _ �t(� , c.i �� 1y ^ /��, �O, k. a� ! 4,�b � $ ' � .^-� � 5�" � w O� },.�f��' SE � .
a w =�.; 3 � ' IH � � � � �r ``�-^ lv x � ti1 �� 3s ¢� .�s ,�.,
i ,�' a' . c���.r F. �<1 �F s J.� ,.Y�$.Q�.�'�f [v � ~ �V 5E 6 3S nY �j� � � ,Y7 ,y H,�BA 3$Atl �:.
�'
i � . . i . : F4, e,� a:,u� � 5 � b�� 3$� rue ��� � ,�r l5tc r H18ii �r�:
f j,�._ ¢ 3rr nv . �saNuw � � ,; � ,` 3;� �b ��s ,�, c 3s�� ����Tr �o `�' in N~y S�ld H19Li �.� � ��
W '^ ,j� � Q .. , -� ,,;,, a -/p2l.._: . . ... � , i ' � Atl H1LTT ,
w �,r
u�,' .Eu .�- 1 9a rni�rif'
I � .r; �a�... . � a���ea" J'"�ur"pW4/� eP "� h .,�a eE ��b.��% � �� II`M�. ; x d W'�.
� ���ti�wae� -.�m � � t�� �v I�' � �. � �,% Hl ti" � � �� _� �, � '°-
_ tna�wt��. �-��S' sN � � . c�+ w 'a� I ' 'A } ' ....... � --- - - �r� � ~ as��' � N `�3S AY HLST� �'n G O u�i� � �'�' „
na� do 'f�' .i,:. �..�� _;;� � :.:.."�Q„ ti ,�,Q;;-. �Y? .s4,�,,`Jj,,,�. ,y �yya,,�J���� $,;, y �'� r
k "�'__.__.
Y
F4U�l 992�1'U1N�1� ODOl 1H9I21Ad0� TZ—�,s
, _._. _._. __. _._ .. .. �, � ..-.�.... .. __ M_,.� �..� r..,.� ra� a.� .r.
� u� • M
�
� iYJY i ' 1A � �� • N .
p+ M ft) v 'f � (2) % ',��� ,� o d � d � o
t �
' ! O � (3) . r � O SR 107lOft a `� � � � / � 0 , O= 0.1 � e 17d �
4 � �... n.t a � ... � _ t.
O gp.�,-�o i�� 2 � 3 4 , r. -----:�.
� ..'� \`�` �_'___`_ n 12� J ```
�
,..��• I.I S A c. (�teu
z ;� � _ 0 +
_ � _ � .��T� �
� .;
� '� J� MARTIN ' S CRE TRAC -=' �
I ,�a ,-. i+1 � r�; 1'.53 Ac � � �
} s •r� i , �•'S :�,1 �s��.u� `CORP. � LIMIT �ie � e o
�• Slt 67lI80 �l�20tS
�" � U N E C , ' c�� �,� A � u�
.� o
------ --�-, (,� 4 �k =��� [�, � �i (31 a
n� �`` � _ _`� � _ ___ � y (2) '\
"--_-_ (2) (l) I � � �nr,
� ^ '' ^ �i,Q O rn .�,� ' � � � % / �.
:�
. i
. � . '
� RENTON QUADRANGLE ��I
�
WASHINGTON-KING CO. '
7.5 MINUTE SERIES (TOPOGRAPHIC)
sE2 10' GO" �s63 564 565 t 680 00o FEET 122'G7' 30"
y r � � 4� ..� � � y � . _ . i: 47'30' 00„
� �4��``.� .a._.�_ "� � � •�• �. �I � . _
�..�t�.'m.. I+ . �'�
...�-j�`�'� �\: �K�-�j `- _ �-�- �-��;=� ` 1 � �:s
�� t �� i �1 i '� .Ho4 y � il ! . , ■ ,
�� { � ��p�^'-j„ �� 1 -- 6cy $ ± #' � � ��• ••'�
'�a�'-�``��-2' _`_�.,._,_��. �-.�_..� - i�,� .- ---.
�"��-� 't � � 3 f�----� ;I �.�^�' » �i a . � � ,, .
�P ck�����_9�----��.�'jy� � � �'��� � • � � _ �
�� �' � �
� ��• � T� ��,.,. # � -- � -'� �-
�,,,������ � �..__- - � 1 � i _ • Par �
,�^ , \ �—, � 'Z� �� 5�60
: R�L.,s`x�2zt 1 L� l n..�.�,� � ;��: .
�■ uto ��o . i " � ..���
��� � �� � � _ _ � \
T�h t � x�'1� ��f �`� ' � � �e f N ai,
- .y��`; 1'��al � i�--,--+� � � �.. ' - 1' v� � _�� .�� . . , . " � . • . �y' Sut3St� 3
I .SE: 28TH T-
�, � ' 1 i�re�@na�n��.� �, � � 1 . `:-- ... , C � �� �
3qre" 1 ! �--�f`-� !__.__ �!� ,... \i �j 1180 000 FEET
f r � . . . • �--
i � . • :�
` _�,�� � � ,� � r� .I: ' �
'� , i �
f � i�i ; �.,� �, � +---� `^ ��;,�.t . .. t
> ,• 3f� r �1� .���; .`,� ^��.. � j.;�,,.:0� lJ .�.�.1'� :,: ��� '�`=
4 .\ ; ��z . �`'� � "f�� 1� W�
�� i \ 1
� ' I 1 �I ,i I � � )t�'� i � {,_,,...,1 s W �s� �� �, � -- ez59
�— .� 1�;`'�'� ; ��� s �.�
� �-`�}-.., t � � � t � . �
� �-R ' `�\e....�.J..390 j-�..f��4��,.-,��� t.s�....�.� , � --� _�j '� �.-.P, .
�� � � �\���� � �f� 1 �� �: �� -:
�: ��� .�� � 4 � I V �` ,���. h t �:I
� �_ � \���� �4 �� 1� ',4 � , ..�. �F� ��� �.�•
io �o i(�� j� c � `a-�'k ;.•^''`�� i�)��<�_ �I r � Pa k i �~' _�-�._ � --' `. -��
�j' 3�_�, �:�� 1�-`� -:��_�� � ��........o._ 1�� ;,�_
; -�` , ��,���,.� �C�;�`__�—�->,,�: ' �;;.� ;f�. �� . \_�__�� �
1. ��c; �� ; "`�'f'V, j tr>-.�,� +' �i� � `.�;,,� \�s
`� r ' /o /� _..��.�._ ��'`�.t"�.,�,.,_�_.,(?r.,4u ,�\�
�, �Pa� `; y�!'�\� � �WS��� ��g; �� �z.i......:����� �,_._�__._ s�``�
� € 1.�
��� �—i I .� i . --- � ` Q\ ���_'S258
��;� x ��i A �'�_ p� { . 3 �� � � �V �`\
� �� �� Maplewo �� J�, 1}t''��.� � — L___
`"�-� ` I\and Count �'�%i� �t�,�.� f�`-,�c:: „— +� ���� �\� � '/�� ~
� ��, � ��� � .:�0� ,,.� �%'. ��.���� rc ���r� � � ;
�i� � A � � ��-. �,� _ �� - ,
-- � �� ��--�i� �` - — ✓1� - �._,
�_ _ . -�{
z � � �'�o �'���� ✓» - ;.�
-� -c��`'so1 �j�� f / .. �� �I—( o ,
�\� :,� ' �;r II t � �� ��j� �_ i � � `; . �1
�.,� -� �-� �- �, ��\, �y`�''� / `� ' � . �
��r� `�,-1--�� '\r�\��,,�\ ��,�'` l � - _ • _` �� ' -�� Q •• . ' .
��.,.,. �� ^�q�'� �
�„�,__. � i a,, i � U- � r�� \\ , ,rr�-i Ceaer R
ark.1 1,��w., �..� � i � � F v / ^ • • � `y .
��Sch`�,y: � � � � � � % � �� ��� ��� � �Mo i � H me � �_ er �
'� `��`o � �+_ �� `V ���,��_ p Mo�ome .'•. �_Park 5z57
� o � ° 4 , � �� ��.. -
i� aV�
Trffan �-z' yOG,�� ��,, ��l—� ��� '� � i.� ;•�'
;I Parkr �-...._ � �V I� � _ 7i %)� �`����....""�� ;%�/� ' ..
,,- AQ fDLCT � '�/,' � I�,'�� �_ �� yl//oo,! ti....,• �
� �
��. � _ ' ��, �� �; '���,.-- �9� /J� r��
�` �,� ..._„�-✓ �� � i V s�� � I � l��) 3�����,� o
'� � ���i i
��r� �_ � �:_._ �� � ; - ;f� � � ��__�__ �� ' \.. . . 2�•3�
�� ��� �`� ��''�' .'�� �' "�`,----�� e �'' ,A
�,,,_„,w� ` --
\ '� "l°��;'—��, ��.» �'r`fL_ ��` `'�i"��}-�.\� ,� �l -��� "oo� soa
� �-��--.-.,,� � �� L .= ;�'^--'� i '`�.._ ,i 1� �`� ��, Sz56
�I,Y :f-��..;:�� v� x H �S�'�� ��"� ,li - ��,�� �1� ,�.
# lo '7 E �� _�� .
�. ' r Ji �.."'
��;� ; � ("'�� �J. /'��,'� `� �•) ` } 0�-- ..� ��
c
j ' z 3 � � i�•`\�r�� �� I. .��� � �� r - �,I � �7 1�� �\� fl`�� ...._,.�u� F t
� } ReoonP �� tr � t��- �. / ��� �� ��- �
S �-^- i 1 � � -�"""" �
� ,
� �:�� i � ,l� \ I
' � •-� �- �' ° i I `� ,� � � .�\ 'i =�6 ' .�r�
� � � � '� � `1� � a + �� ��"� � , � :a 1 ' � ��
� �c � 1i i � �.1 i. ' ` 3� � � \' � �����,i
�',
� � �� ti �;I ��� � � � � ' t��-��nvo�d �� � �� �1..t�.� l� `�
� i F i a. r �ti i � ,, � Golf and u CI q `.,5 rt'' t � �
. i F �^;�. {�J \.�� � 1 . `� �1� 3.,-,' .
�''� i 7 � � i '�f i d`;,�, '� ���.�-�. :;;' �� � f,.r..,�..n...;
� � -
. ;
� ` � � � i
p,) �� 7 �_""I�J�� 6 M�. 70 INTERSTATE 90 �`�� tii�.= �.�OfI15 Sf12Qt J�� AfTIC 159RQU4N 12 Ml. I 10� -
� , y �; { � >� r �3r . f �. �`�� � i��u�� ��� �'." rv cL "�
/� � �t� ,- �' � '�bs(iSx � �� p ��' �- � �. � � Aj r.
.�..� i( :> � ��t�� � hi .ty' if „� ��y�F ���.�� y{{ +.,��. k'� �- R � : �� ��""�*�,t .,��� j
�� K� ; �f. v h-¢ � t �� s `� . '� � ' u_ �r 7 t�
� c � � � . A�' F µ $�� ��'� i.�a �.{+ F �x�mfJ �t � '` F , '� d'iE:'... � 6. y .
1\ :,,�"'' f .� � � : !i 't� .i.i��ks�► lla i �. .s},t� �r 1
��� :i� � �;t -;,�E � Ur �;; � t�� �i4 � t��a�}1 (� R?a'r � �"i` -�.-4 �� .-,�� � „ � II• qp
' �e ,r� � >
•'�l '� „ �r��� ; � �� .�.� r— e
�;:z"�.n� - � i� _,,, � . . s�r ��. o � r �. ��.
� f ��"� �-�F�Fi� • i� � a. � �� * ��ti
�:�, •a � �� ., 8 4F s, .? �R- ���6: :�� t P —� ,�{� .��,� ���V� ,3 �3�
� �:�' � . � ;+�� a �: q% ;Ge� � °n � I .�
�.'� � . ��� ��p� �� � � � ��y�•�_.*'' �t��T : �€,� �Et' �.rr n _ ` 4�r .. -
� � � � ��- i ••��& �e i�,l t��Y �� : �"� '��.
-,� .< .o.;:^s. � _ i /r- .� i� �.�x ' '�tia'�L'/,g� � � .i���;;,i� - ';'� �
� _ � ¢ ��i a.i P ���!� � �� . � f -, y '
� v �� ;r --c � '�i �. �' li � � c� ,. ..
' •� � � : r -
R y g t ol. *� = t � �r�i i� a.� n $ � �,�� • �� �!.z` �. r �.
� ` I ■ �7 �.r '�. � ?4 �� ■ ��� s�i". T 6,r�err �fit� � , ' � ' ra .
, ; , �,r � ' �r � t ;�\Q� �;t � �e 1 `" ar � iS `. �.. ` � �3.
� t+ �` il �
� � .� t �� :gv'� `• # t',��^4 ����i� �i� N � U. 2Fki•' �a�s')�• ,�;13 Y�I.• �+` �-:�1 '��Q��roI
1 7r�.. .�� � _ .�-ti �
�; _ n � ,
-- �thfetic } '� � . • L - f� � R+"' ✓ Jf '�f kr;' +... r ' � *r��` _::� J�s � t'�t��*� �3 ii �i. I 3 3 4Ga^.
-.' �`eld 1 J; ..�� � S\':, • ��`i �� " _ � i:�, 'f "T �� '>-,r`� tir' .� . .
� '�,`teenviood�Ce
� � � f !� `��Yt�.� s;, � � �s.,�� �–� � ',., • � _
� : �= i, ��. / � t � � r I o�.� � r
.'Ci� ! �.l�t� ;.. ,�� � t f,j a• �. �,.:'r i {, �, p FY£: .� t
��- ) � 4�y, � ��J� �,'�� � .y � .t� - y �� ���. . �
j �! °� �'( ��.� c�'r� ��� x r-,• �� tc.._.` -�h e�# i ��i,; ���. *
i � `� � i� t r. • � .{ ^ £�� � � �����1� �II . �1\''� i �'Q�b '��' � ���
;'l � ' t� ;�f�� � � �i5, EvGi��' � `'i';�I ; e � Ii i :r I
1 �I I ,� � �`� , �� a'� �l� i',L` i ,t�� � '� .,i� A ,� 4f �i
� �
,. . � +"" 4� ,�age�ai� ° �j��/��
il .. � � � `� {�r�G �� J ���:�� �C3}ZAYEL i�Pl7-��- � :I�rv* � �. � — ��,..
� Pc' 1fi\� � a� � ' }I ` ��
z .' � � i>� 4 J`�� s ' 4� � 'a�4 BM� ,,. !� �a �it i '� �t ,� i � i
�"°� � y i'''i� iTah �", ., s :IG O.`- % kI0 �i � � t ��E� � '�'TJ �
.� r: I 'f . �h ` ` o' l� t, \` � n � i ��. � `, -
1�' - J � � H 4 ` C' �:` .��
` � ' ��- �--• �--�, p 1 ''� P`�' �' i. l�
� h ,x. } �C � ^k� " ti; ����} ♦ r
� � � �;��g ' � ,, }T , � �� �l: .,
►z !' 9 �.' � � !�,� y . � : '^`,�"i^ �g° �!` i .•c�.S l �t• 3', t ��r` `�_ y�� ' _ ,:�
�, �>7t. � � � �-�x �?11'a4 e l. r6 �� —� 2� �� : / � �r .,-J� _
�', ;� � �- .�.��lir ' ���G.u'� p� :� e�� ` �. ,y � J `� "%.�
- '� � � �` }� rk`f'� }Ms {� �� "c`'q"'�'^�-�.,�`\ �_\✓� ' � � ,�� 1 F � .lr�
1� �, p I' :,..,,,,_ {�.,� �`'� _ '�,.,"'� ;\ `} ,,��1. .���;�
S:.j: k. .�.. � °:`e'�;" "^�iC�^'�,� � �+ �� .��' -..% `� ,y..I/;
„'i, :Uf "_�'' ��;� �.. '•,ft1 `'. � ts�: �7��i� ��,'�. :'E:.e �� /,. .�}+4I - %��' �i :I::.
.� �I _�_`� -`�y *- �+�.i � ` �l,'..5�. , � ..���;i� -.., —_:.=�a,�7Ph,-�-�� �r-- � =-�-�;F�-
� I � � � \��c " "�g49��ri � �/�� �"��"�'"`� ?v �d�t� ✓ �R'� � ��/�
�. � 1 ��T � '�1!�'' _ 'p/��, -- �'� r J
�� �$�� I�- � w;f;, � -�.p� i. w.� �S r j '.,, f 1q �, q���C � :. I 3 � ` ,��f'` x "A�rs � �j ""-".
. ,
n� J`�•- _ � � _ � � �^ ��;�. 1' -- '�� �' �`:�.. { t r� .? . ° � a 4
, i � . �, _ ,.�?,,,,,.�1f7C : ; ,� �r` r � E t � .� �. �
i j � � � °� •q f rp �-a _ P \' , �:� , _. �
� � U� �' ...i ',•,.t ' � �:�t ���'�G ,'�.. -1�!".' ``� :Y�'r i' ,\�Y l�,- i y%. � � f v�::`�`. �S'��i�"^""�
• I .� � - �Q� . ,
. ,,.�.. � � � � *.. .t 9c� 6�r r� :� t9 - s � �`?s �/`� - � r,/1',' ��:: -' py �
�-'o. !' C.a � g �� ✓�� `(� .
i �u '� t ��-i=: '
} .�µ i � t ' � �
r °�0 d � B i .,a ('� il C jy `� ..
� � _ _�uh6�a� hmCi � ��h � �'� �-x. � �����,�" � p 1
��� I �� ` l A1 �'' / �' F
��Yrht : ° y �
� r � �, AgC ; i � ' �/���� ,�� � ��`1. •�� j�� V%J �.�
��cLt : � 3�_� � � . 1 � .� � 1 � r� �. Yb {,' . �, ,� y, •i � �F .. 1 'S _ S � (�`,��° ; � f`"
L � �}
� 7,� .�E � � ���'�� G� '>c� � y '` � �� � �n `�, w <' �L� �u '� ..�-�', \ r. � ` �.
�.S��,� 1 ��� i �' ;� i�_.h��, try -�: � ���. �1\��- i - � 1 �� t �
�1 t'' " � �1� � , � ; , , � ��,k � c ���, t , , �' � ` , _
ci I t �r � 1 w a , � �2�r' •� �� l 1'� �
3 ���� k- °y f � ��z i. ' � ������ � V � A���� ��`� �
k � ��� �v r i '� ��_rrr�' 4% �% U , � �` i! i A �:. 1� ������� � � Ak��� .,,`�.1�/
� I1 ` 1 .� � j H' n b ` P t.c '1NL, ts. <
. . ..
�.I:JL •,, \���. � ��.� '�' rY�9,��h s J/� � ��t � � i,. �� `� � . �f .F' :`i -;:
�
:e 4 po i bi 515` v:���� r r G'�, ' �-.�"�_�' ^ \�j� '`� -$ �'A r ti �"""*,y,;.
�'
x�1, g „ ( ; , ,�, � --=�.�,---� `,�., � E R��
� �u• ?;,$ec� ��� -� }J� �; _ �' i ___ - c�;i; 4::�� ' �!c
�tl� 1A�'::. � ..i 6;+:"�'d-Y,' ' . {�.• I� '�/_ � } i'�_� "l-' .
.':�U' 'ji�:�� i ',r�.'+�g� '�•' ��� ,�,mfr` , h -1+N�� IL�� ,.—1�� �' j'# � ,� �` .'� -` �'��7'_
��� 11'bR� � � '� -� � .. " ,." ��', �j) ` � �x :� �.<s..,?:. ,.� h �� ...
H' '��l yR` 4,rt*'�at�--$*c -�r `Y - -'�'"- � <-•t-
-;; 2�4 �s --- '�,,� 5 ,. '� � Z '�1 �� � '�";;—, ,� � ��� -- �
���-� .:...�, .- .:.�,,� ..�,� �.: .� a, .�c - - -
� _ � � � ,��5' �rl�k '''`'t��\ a C, f �J Ia" :.-_� �� /^� .�_ -. o'_"'
fk� I
V ' { � l /� r"� - �t
� �
v �� � r �I �Y:� r Y*� 4 � r� � � � � �JJ—'.
1✓-'� �a // �'� f � - �i �, ! � ��
� �� r� !-'��..�� �2a _.yit`� � J�r i, � -'-�"ti� 7, ,.Rf � _�-_�.
�k .�� r r r �` � � �'�;q� ��.. � S '1',t,(, t �+s ^l�
�>��,` �= ,x � ���,: ; �' LJ��� � r�rr� � .�� ;t � 1� :���
V�ra 3: —. -t �l � �'�, � � .�vj
:I �,,� : r.� � ,� '$ ' { r�.i<�. �J� `, � 3 12f3� [� u�� �� Q �� ..f•
, i t � .3� ��� _ _ , n �J ��� �(.f � \ �' ��
,
��� ;:�' �;: •�-j� _ . . �-�- '�� "� �'p�
�� ��� . "*�`[� � w . �� ; � r � '� ft�,j 1 ,y I x �!' ����� 1l
�16 �f� x l, _'.�L�3��t� j { � U!" ��. t � � ..
C`�_F," t �� , :b �M � � 4 . � � ,1 � :� \ w' `���
r " o � � � �• �� .
slc��� ,t,, j r ' 'Y ' ,' � � > ¢��� �r–"�\� �. ( � �' 5� " ,a`s /
r�,� � � ��}t'^cs i- �r '' x o•;� '.:r + b���t��" I 1� : \ ��Z 1L --����,f ' L rP�r��u �, `�'� �i
I f ; ;> � _ _ ,`�'!sa"`r .. �� �'e m � ��i.�-a - {y i �. � t�� U r '`.t � .�.
.i'���'• ILi }�. �__. . �� ���Al-ff"��� :.� l�r: ,I_ �� 3, ,��`� . . �". '��� t��-f'i�'� `III`-� I�l C'? 'o � 11.�I�.�.l�,�. . , v �
CORE REQUIREMENTS ANALYSIS:
1. This project will discharge stormwater into the existing conveyance
system in Duvall Avenue N.E. A new conveyance pipe will be
constructed along the frontage of the site and will connect to the
existing conveyance system in the road that is located approximately
30 feet to the south. Currently stormwater from the site flows to the
southwest by way of a wetland, but this wetland will be filled as a part
of the project. The amount of water that is diverted is very small and
should have minimal impact to the system.
2. A Level 1 Downstream Analysis dated January 4, 2006 has been
prepared. The small amount of runoff from the site that flows to the
southwest will be diverted to the existing conveyance system that
flows to the south and the east. Since the amount of flow is minimal,
no impacts to the downstream system are anticipated from this
development.
3. Flow Control is dictated by a Level 2 Standard. A detention vault
with a controlled outlet is proposed.
4. The conveyance system will be analyzed for the most stringent
condition. �
5. An Erosion and Sediment Control Plan is included as a part of this
submittal.
6. An Operations and Maintenance Plan will be provided as necessary.
7. Financial Guarantees or Liability will be provided as necessary.
8. Water quality is not required since less than 5000 square feet of new
impervious surface is proposed. However, there is dead storage in the
vault so that it can be a minimum of seven feet in depth.
SPECIAL REQUIREMENTS ANALYSIS:
None are applicable to this project.
i
m a �
� / ���
��
��1 °�'Z"C� = �9'O- j b'O � S ��1�.y2�D
� -'-�r�,�4= g� }-� 8� _ <'�8 l�(�h�2)�-�.'�Q
_�y��,�o s-�-�) �
S�e���n�
!
�
5��.?,p-�-A-j y�n�j i
�
C �> > b�� '
`�-�/-zt•o = -���-z.s `t �. = s 5 �''�-`J �
i
-'-� � ► ' o -- � �'�&+z - Q�"''�'a�' � t `��,;
� '..� ��
C�,-�;h4�,� � � "'"'��
� ; �►�;�
7",'.� o��O " �.�' �.`C.l��, -' " W'���y, V �N�
i Ny
����C)����yy�5�� j a�g
� �Y2
;
m re r+e
±w m rn
q..q,.a
r.��c_
�� ,�.� S�1�� �OO���1'�/ {
• v
J , o _����x�l�) � 1
5'�'�'�` b �� �a� b� �-�.� -� �� -�-� I
,
sc�� ��rr�� }��-�,�
�
___�___,._.�
N��.�+-�C�t� �w�.P13 C� '
�� '� �.�d r �Q r.��`�z �'�'"�^�� �,���� v� ;
�
C\ �
KGRI,S,�` `�,��� ���
� . ..
. ..
.
� � 5 .. -
� . ..
� : .;
� .
� . ,:
� .
� .. � - �
Com ute iime Series
�
�7 � � �i
P0� �R�',,. � �;` � �;: ��, ':� r �,. _ �: ■
1 i .��'
Flow Frequency Analysis
Tame Seri.es File:prewb.tsf ----�--�--r-----�-�--
Pmject Location:Sea-Tac
—Annual Peak Flo� Rates— Flow Frequency Analysis
Flow Rate Rank iiwe of Psak - - Peaks - - Rank Return Prob
<CFS> <CFS> Period
0.899 3 2/89/@1 2:A8 9.197 1 1�.90 8.998
9.852 6 1/85/02 16:89 8.128 2 25.A8 8.960
0.128 2 2/27/83 ?:8B 8.999 3 18.98 8.990
0.833 8 8/26/84 2:88 8.687 4 5.88 6.890
0.�49 7 1/85/�5 8:88 6.079 5 3.98 8.667
0.88? 4 1/18/�i 16:08 A.e52 6 2.99 e.SeO
0.0?9 5 11/24/� 3:88 8.e49 7 1.38 �.231
0.197 1 1/89/08 6:09 8.833 B 2.18 �.091
nputed Peaks 8.1?2 58.88 0.988
�
1 '
!fF
`C:\
� 5 55
- : 5.
;
1 � 5 55
� i 5i
� 5 55 -
5 55
. 5
. ;
. 55 � -
Com ute Time Series
�
� ..:�,.,, �� �' �Tr�,""�,.- f�4 ^��- ��"i'�... �'k,a„�i,�-e�g���g•—�—�—. '�I.�`
� „
. _ <., ��.�. . ,,.r n�.. ..i�z '�...�3__._.. _�a _...;.:. _ _:.�._..3�.. ._..., ___.... . ... .o.
�� �,...�.: , ra.
V � � 1 �
a._; - �
Flow Frequency Analysis
Time Series File:devnb.tsf �
Project Location:Sea-Tac
--Annual Peak Flow Rates--- ----F1oW Frequency Rnalysis-------
Flaw Rate Rank Tiwe of Peak - - Peaks - - Rank Retum Prob
tCFS) CCFS> Period
0.181 6 2/991�1 2:� 8.362 1 100.08 0.990
�.158 8 1/85/0� 16:80 6.243 2 25.e8 0.960
�.217 3 2/27/03 7:� 8.217 3 18.�8 0.909
8.167 7 8/26/84 2:00 @.200 4 5.08 0.880
0.280 4 10/28/04 16:00 8.142 S 3.88 0.667
0.192 5 1/18/06 16:� 8.181 6 2.88 8.5N
0.243 2 i�/26/06 8:88 8.167 � 1.38 9.231
0.362 1 1/@9/88 6:88 8.150 8 1.iB 8.891
nputed Peaks 8.322 5@.�8 0.980
.
�
� -��;
.
,. _
e
0
�
�n m �� m ml mi9� m m � � mm mmmm m�9
O N�m����mm���m���mi�mm31�����m���m�m����{������mmm61�����mm
p . . . . . . . . � � . � . � . � . . � . . � . . . . . . . . . . � . . . . . . . . . .
S�Ymmmmmmmmmmmmmm�m�mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm
m a v
p�+np �
M�rl � O
aAv � NM 000'��riNM�LYI�O�OC�0D�m0�mmrIrlNNMI*7{M'O�V�LA'C�O�M�OC�OOOr 0�1+'7M1mF1�00�r1��p
�p v Lf�
��m mrlrlrlrlrl rlrlrlrl rINNN�y�y NNNNNN� C'i q' �OC�C�C�
� �N�����mmm�mm�mmm�mmmm�mmmmmm�mmmmmm�����m�m������-mmm�
. . . . . . . . . . . . . . . . . . . . . . � . . � � � . . . . . . .
, , � � a � �� ��mmmmmmmmmmmmmmmm mmmmmmmmmmmmmmmm�mm�mmmmmmmmmmm�mmmmm
� �� � '" `" � �,���ymm A"�m����m�m�'��mm`�"a�mmm�d��mmmm��mm���m.���m���������������
. �W 4y H 4�W C14y�1 r��V 4� � � ■ � � � � • � � � � � � � � � � � � � � � � � � � � � a i � � � � � � � � � � � � � � � �
ro �� Immmm�ommmmmm�mmm mmmmmmmmmmmmmmmmmmmmmmmmmmmmmm�mmmmmm
C�� �� �� �A v�
, •��m�a'��� �'CVN O �LA � ,
. . . . . � � . . . . . �' . . .pp . . . . . . . . . . . . . . . . . . � . . � . . . .�p. � � � .�p�
,:,�:�: :��31��� �h � ��mrl��j Ci�/lW�rIP'f1�A�O�u�N����r�IM�P��C�VQ'��Ar�I�L�i7�OD�N�L�flIAlNff�LhffL�f1�����OaDmN�1'�hOrrNIM1�f1�OD
� �. '��'"++ � CC� � �irlrlrlrlriN�VN�VNCVC'fMP7C7Ma'V��'V���!{M����M���IJ�NLPJNLHI!l�O�O�0�0�0
�v, ` Q . .
v
�' � �� �
���A' .. I�I 7�unnnnnnuu �y � n n � � t�"`.�.' ' . , .
•� �+�"i�'i A!�i e m'Cf!r N .rr n m i� 61
61 •rl�►i�1 61 il O R b 61 61 CJ i��L!1•r7 � �C
c ro � �� � a•�+ �n+�+u •�w •a� �, e o
O P4 •'1 C•ri Q 0/i�rl S q�•� 61 v m N� O •rl m �y �Q�D�0 '�0�D�C�O�O�0�O��D�D�C�0�D�O�0�p�O�8�O�p m rl t+'9'eM Llf C�0D Or m N�y N N CV N N N N N�y N
•� C1 �17 A�6 O ayy S � •ii u/�m��1����riNf�'l�Lf�1CL�ODO`m�-IN4+7�I1l10L�0DO�mrINM'Q'N7LA L1yN7LffIl�Lff�O�OhODO��rINMd'L/f�OC�OD
. i�1 C �S�l Dt D� �r R�•rl �i LI M i� � � � � � � � • � � � � �m � � � � � � � � � � � � � � � � � � � � � � � � � �
"�, :' � •s R'aa�+.� ��mamvAo «Ca ii mv���������������m����9'������������� �€�"�m��'��ffi��'��"����S3S3
e i� wil•�iri �Ow IJJ�1 �r�l e rl .�rlrl.�,�,�.�,�.�,�,�,�,irlrl,�rl.�,�.�rl�rl.�rlrl,�rlrlrl.l,�,� rirl,,,��rl.�,�,�,�rlrl,�.�.�,�,�,�,�
� i� O���y�jmO�OyG � �� � W
Ci C1�C�i CA � w�1 i4 O� v
$ � �a R, �,u, a o H 3 � .e� �o�o�a �o�o�o�o�o �o�o�o�o�o�o �o�o �o�o�o m,� d�u�,ti m a m e�e ev e��o N e+��v c�cw N
� � �`r• �� � �y�� ,icw w a aia�+��D��ai��,�e�ten�u��er�aoa.`c��+e�enw��oL�ma`�,�c�r���n�r+ v�u,u�u�u��o�o�000�m,�ewena���o�m
, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
' , �: •� y� v � F � r�l �v������������mmmm rirlrlrlrlrlrlrlrlrlNN�VNNNN N�VCVNNCVNNNNf'�iMMCMJC�MMM�+7
�i, .�{ � yaj � - � ��rl y -
�,,T: ro d w � b -; '
■
w.
/ I O rl r10e�0 C�N o0 rl rl CV aC'0�N
IO1 . � � . . . � ■ . � � � �
��N�+'f1AC�L�m�O+rNIrhIN�
1 I 1 I I I
� �
�
L�1 3R1Lf1MrImODrI��rINN�
"������°�o �`%��mm�mmm ���ffiffi,�
m����mm������mmm��m���m �immmmmm�m : o mmm�mm�mmmmmm
. . . . . . . . . . . . . . �
mmmmmmmmmmmmmm�m mmmmmmm a F+
Opv oNel*J�,V��a�or�,��ou�co���mr�i
q e b�m6'Immmmm�m,�.�,�i
p . . . . . . . . Iq afRlmmmmmmm�mmml9m
i►I�ri rl [7'N O�Lf1 N rl G1
ODrINN00mmmmmmmmmm� mmmmmmm CAi1MN�ri1l1y�00
C�ODODOrLPJO�COC� �OODO.ODC�N�y OD�O� O�MLt WMO�P")�y�C�N�
H
mmmeri0`�o�h�Nd'�OODmNQ� N7C�oD�rIM� I C��O�Oi�IlfV�f'9M 1 T �� N�� M�� em+7��am�
mmmmmrlNNt+fChC�'f�+'ft'ri�f'�M�M d'a'a'N7u7ufu7 � C � �-i�� I I � I I � I 1 I I �
v ¢ �rW WWWWW WWWWW
OC�VLffO��WN�Dm�GDNC�rILffO� ML�+r1�Om�00 � O I � 'gf��ODNmN���DLffC�'7Rf�0
LlI�O�O�ONC�ODODO�OrO�mmrlrlrl NNI�M�d'� �vllJt'hrIrIWLf1MNrI�OC�71'Nfl
. . . .
�IrIrIrlrlr�rlrlrlrlrlNCVNNN i�ONNNCVNN ��YIMr16fIV�AOr � �mmmmmmmmmmmmm
� � � � � � � � ■ � � � � � � • � � ■ � � .a � � �Y7mN�0a50 ' � j .
mmmmmm�mmmm�m{�mm mmmmmmm � � . • . � � . �
��������� � ._'.".".............�'.•
�iC *Irlrlrlrlrirlrl �i I i7lmCONOO�DMI^�mmmmmm
pp . . . . � . .
. � � � � � . � . 'tl {A CV LA{M 0�Or V RI!V C��01D OD rl�m m�(1 m m�
�o� �mmmmmmm �� mmm m mm m ���oeu'►�N�oO.�e C ! , I ��'r�l NC�9r1�'Orc�L17m�
C�Vl�07�D�NmW�O�N�00�0'� [V�OO�O�N� i�1 • • • I
OGmNP9y� p��iN�M�00D rIMN C�O� N pp CA�C9M�MNrlr1 � � I �:C I I
�OL�L�C�L��L�ODOOWCGODO�O�O+O` O`Qr�mm�m ' i� M f'y NNNCrfM d��m
���Im��� � �Qmmmmm��mmm�
,a,-�,a,.�,� �� m i , � ro —
�I w � , � � � � � � � � +
o WWWW�WWWWWWW
. �mm.�mm:. � a�a� �a�,�,�,�m
•S C 3NNrIrirl�OMrlrlrl*��9
O W W 61��mmm�Smmmmmmmmm
NNmmmmmmmmmm�mm� mmQlmmmS� � � ' ; (4 N alii
ODO�mrINM�'11f�OLti000� rINt+7 d'LA�OC�000`eu w � ++i� H y
. . . . . . . . . . . . . . . . . . .y�. . . . ��m ;r . .�� �Cp N�8�������
�����mmm�������� ���m��� ���pN � �y VP4 � I �� � � � � �
, rl.-I.�,�,i,i,�,��.i,�rlr�,i,�rl rlrl,�,�.�l,ir� 1�� O 0! 1 W W W W W W W W W W W W
q W ' : �'�•rl I OmmOpNmN���01AMM�0
F+ � fLi�A ! fAIJIMrIr10DNMNr1�OMMrI
' � b �k.. ... �� �� � ����m���������
� �•
0 ����Nm��� �'���� ���
NN�mmmmmm�mmmm�m�mm��im�� rl MNrirlNNeirl � i;
�. OO Or r!1 N M�M LA�0 OD O'�m*i N M'�'6fY�0��OD O� t,w •r�l•rl•M """'••••••••• ••
. . � � . . . . . . . . . . . . . C m�mmmmmm '�'c�`; W W C
{+9M��!'Q��M{NtN{MV�V��NNLiJLA1NILANY7LALA10 � I ' � � WC�'tl�riQw�DFfrICDIJJN���
, i '�'' yg'��, om��ma ffi�`m`���,.��
= rIN�7�MLf1�OLti00 I Z�M i� � � � � � � � � � • ■ •
��� � � �m��mmm�mmOmmm
ii�i:
�. �
� DEVELOPMEM'p,�,qNNfNG
CrTY pF RENTON
APR 2 61005
RECEIVE�
��.
Baboldashtian Wetland Delineation
Renton, Washington �
i
Prepared for
Mr. Mohammad Baboldashtian
Renton, Washington
March �2, z005
2005-003
Prepared by '
o ��
I�;C(>LO(UICAZ. SOLtTTION6� INC.
4013 32"d Ave. W, Seattle, WA 98199
ecologicalso/utions@seanet.com '
(206) 285-3015 ',
Scott Luchessa
Certified Ecologist, M.S.
t �
coNTCN�rs na�e
�rr�rizo�ucTioN 2
Sile Conditions 2
METHODS 4
ItESULTS 4
Isvergreea Scrub-slrrub 4 ,
Palustrine Broad-Ieaved Deciduous Forested Wetland 5
Broad-leaved Deciduous Forested Upland 6
{�{'etland Funclions 9
CONCLUSIONS 9
Limitations 9
IZEFERI;NCES 10
t�IGUItEfi
I Site. vicinity map 3
� Appro�imate locations of sample plots and delineated wetlar.d boundaries 7
TAI3LES
I Sumrnarv of�ti�etland determination data and classifications 8
APYENDIX A
Mf;THOUS
APPENDIX I3
UATA FORMS
APPENI)IX C
�1"TE PIIOT()GRAPHS
- -- - ------ _ ------ --__ _ _ __
Fcol���ical Soluti<ms i 2(I(15-I1(1�
R9arch 12, 2005
t �
INTRODUCTION
At your request, Ccological Solutions has completed a jurisdictional wetland detennination on your �
property located at 276 Duvall Avenue NE Renton, Washington (Figure 1). This property has a tax
parcel identification number of 1523059075 and is 0.91 acre,according to the King County
Assessor's office. The Assessor's report also indicates that there is a mobile home on the property.
This was observed when we visited the site was first visited this past December and again during the
investigation on February ]8,2005. During the site visit you indicated the approximate boundaries of
the parcel. It is my understanding that you are having wetlands on the site delineated to better
determine the potential value of the property. This properly is located in the N W Y4 of Section 15,
'f ownship 23 North, Range 5 East, Willamette Merid�an.
Fences exist along all of the property boundaries. These appear to be accurately established along the
property lines. A distance of 186 feet was measured from the fences forming the northwest corner to
t}�ose forming the southwest corner. From the southwest corner to the southeast corner is a distance
of 214 feet. Development exists on all sides of the p:�perty.
Site Conditiorrs �,
The mobile home is located in uplands near the southeast corner. Topography generally slopes I
gradually from the western tl�ird of the property to the east and soutl�east towards a small depression
that runs more or less north to south. An approximately 2:1 (horizontal:vertical) slope abuts the west
side of the depression. This is generally covered by a dense thicket of Himalayan blackberry(Rt�bt�.s
discolor). Tl�e depression is isolated and ends at a small berm near the southern property boundary
tl�at marks raised garden beds on the adjacent parcel. This depression occupies approximately tl�e
middle third of the parcel. To the east,the ground slopes upward gradually and is approximately 1 to
3 feet higher. Standing water was observed to the toe of slope within the depression in December.
Y►-ecipitation for the month of January was slightly below the long-term average recorded at Sea-"I'ac
lnternational Airport. February was much drier than the recorded long-term average.
A line of mature Douglas fir(Pseudotsuga menziesii)near the western boundary, the vegetation along
the western third of the property consists of open, lawn-like area around the mobile home and a
solitary black locust tree(Robinia pseudoacacia)dominated by non-native grasses and forbs. Among
the common and abundant plants in this open area are dead nettle(Lanriunr purpurewn), dandelion
(7uraxacunr cfficinale),common chickweed (Stellaria media),annual bluegrass(Pou un�rucr),
common velvet grass(Holcus lanatus),a7d perennial ryegrass(Lolrum pere�tire). In addition, there is
a small stand of Douglas fir in the northwest corner. Beneath this is an association consisting of a
mirture of native and non-native plants, including dull Oregon grape(Afahor�ia rte�-vo,su), English ivy
(Hedern helix), beaked hazelnut(Corylus cor�ruta),osoberry(Oenrleria ceru.ciformis), bracken fern
�P/C'!'(CIIIN)l U(,IflIN1Ul17�, and holly(Ilex aqurfolirmr). Neither of these plant associations are considered
hydrophytic vegetation and hand-auger borings confinned the presence of Aldenvood gravelly sandy
loam soil, a non-hydric soil, which is the only mapped soil unit(Snyder el al. 1973) on Ihe site. 'I�he
methods and results of this wetland determination are provided in the followin�; sectic�ns.
I:coloeical Scilutions 2 ZQ05-UO_�
h4arch I�?. ?UU�
0 . i i • � � 1 ' i � �
�� � ,p � � ��«��� ... .
�t ��r � '
. i� ,'�.r ' l
�,�� t+ �� i - t,, :a.: • ; c
��' i ! • ' ., �� ,y �
�k���� � y ,r���� a'�..
�#��� � . �F -'�� ��-Y
•�°' Y i ..r �.�7°"�=:..'� _.3't
' q�.�.,�ir�.s �.
tll' _ �'�f p� . 3������ �.����t��+�.
, . ..ia,,rR ''. :i '"i.+aA�' �
• f' t�+�1e�' -
�.'� -. ` `�� ' �' `� "��;:-
� �. M• :��—�s�►�:.._
j +� ., -�< ,... �-_
�. � � ♦� „� ����y� i:. �-
• 4,4 r� ,�i►"��' �,u� '� w-:+. '*+�¢ ' - t
.r' . r�'�> _ � .._ . _ :_y,• � +r �.
�_..�w � �� ' ' �s' +*�'� ¢�� �'�+L�T �' .�YM� _ . �� . .'.����
�;� � ..9°♦. �'J y, �.� ' . ,� � .i
�f' " ,� x,� 'r:.� ��.�`���'��` -'� ,� +'� ' �. ��ti������
;r � � r• �s'"_� �f":f,�,:,r•� __�,* -T,`�"�„ti} .t�r •• �b3�
;�, ` +� .. � 'i � „ . . i �� :
.� -� ���. �.� ,� Y`,a�� ,�.� �,
,�,. � • 'i ., t ,S• • Y�s ��•� ��� _ � . . �.1� *�, _��`• - -,a� �,. � .
�. •. �S .
2 ,- r� ,
, ( .,. „ } ��. $_.. �s�� :,:�
it.: ^+1� �. . l�.f/1 }y1�. . �_ _—' .. � ' " !
+e �kr`...f4' . — r�• - � � . . � � 4� � �
+'�� .1 � 'If � 4 - �4 ��+��i
��''�'y�� v .x 4.� 1.�• i � j. ...� � _ . .� _ .J._ '
. :t i _• ' � .�L �ea:} . . �+Y4 �� . y �r �,-K
. ,�- . , s''�.. � � �+n'.
, ' � _ ' . �.' _ � .1. . � !��� -:-"
� . � V• �� .'_{. :�j -�.. . � `r � •.
�t�` rc�k. i S . � ,L 4 �� ��. . 51 �.t. .{ � t!:� .
9
�j µ ' - r �li " �! • . .�j' .�. + F. � ♦�..�- 4
�._...s ���. � � � •�y�{,y ^�� . - �� �P t .
t � _' .,,� ;�. ,�"
.-} .��' .�'1.�, T � .i!•�_ 4 - *` � . � � �•�.
! ..� .�. �� � W.�_ 1� a . � _ . . �`1i y.. �.� � ,
�� �'.+ A q� . . , r �t#lRt�qZ,ji[�',!' ~ �7M' ,`� �Ls�� . �{ ��3i�t��F
.. dx�s* e* .y; �1� :,a�� ...t�'��1.�-.: �� '�. �F�. -•tit+�v. � •4,, �*�+
>�- ��
� ���� �� ` ` �e � � . t'
� �� -4,, r •���w� . �� �M'�� ��y ; �,�'�M.�
'�'' � ti ♦ _ . y^� 'fa`� s.
t :�S•* • i �� }t --.,, �.,, :. �°� 1 . � ?,
/�j � ; !,�'� s lr,t .: 'f . .. t - . ' _ �.. +
'�� t� -- , s � �')�y
�' >s ' h ' � ` " 'J _ r.
ra rb, �n '�"' a}������* s.��y�.�.� �' R riS_��,�;�
t �. , �� � �;,,� _ ,., �:
�t � ,,c• .c -M�
� � ' ' 'r. _ ' ,.? r . - _�t_ 't
•� ' � ��1' c ..r' ' �-
E.•` "� . _,t j; ,�
' '�' � , .1► . �� lt�-�a-- r �'=� .: �.s�i:.,t. tr '�
/
N.R� • • •� � '" ) ,*- . :.�,�. � ���wi�:r
~� a��� t` r . ..
� � J.� • 1i r,•* vr f.i��' ' �� r� .
��j.K �f1'' �"�ab ". � �.�
"�.,�'�� 4 f Y '
1
,�s ".�'�. � �J ' ..� •v� �/
' a�
r �
w , ,
Methods
Ecological Solutions' used the Routine Determination method described in the Washington State
Wetlands Identifcalion and Delineation Manual (Ecology 1997)to determine whether an}�wetlands
exist on the eastern third of the site. Sample plots were eslablished in representative vegetation types
in topographic depressions and adjacent areas that were slightly higher. A more detailed discussion
on the methods used to determine the presence or absence of each wetland criterion is presented in
Appendix A. A total of four sample plots(SP-1, SP-2, SP-3,and SP-4)�vere established by
Ecological Solutions in the representative vegetation cover types observed on the site(eYcept for
those noted above). The predominant ve�etation cover type consists of early successional broad-
leaved deciduous forest associations dominated by red alder(Alnus rubru)or a combination of red
alder and black cotton�vood (Populus balsamirera ssp. trichocarpa)and }lirnalayan blackberry-
dominated associations.
All sample plots were marked with orange flagging labeled. For example, sample plot one is labeled
"SP-1 ES 2/18/O5." The flagging marks the center ofeach sample plot where the test pit was
established to examine soils and hydrology. Wetland boundaries were marked with white flagging
scyuentially labcicd /1-1, /1-2, A-3...A-19. ln addition to test pits, soils were examined with hand
auger borings, particularly in areas with gradual elevation gradients �i�here wetland boundaries were j
determined by presence of hydric soils and wetland hydrology ratlier than hydrophytic vegetation,
which is present throughout much ofthe study area. All sample plct data were recorded on Routine
Wetland Determination fornis(Attachment B). Photographs of wetland and upland vegetation types
' are included in Appendix C. The aerial photo shown on the cover of this report taken in 2002 and
downloaded fro►n the King County iMap website
(http://w�w�v.metrokc.gov/gis/mapportal/iMAP_main.htrn) also sho�vs the vegetation cove�t}�pes on
the parcel. It should be noted that the forested areas on the west side of D�n-all Avenue NE(also
known as l38'h Avenue SE)have recently been cleared as part of development projects.
RESULTS
The vegetation, hydrology, and soils observed in each orthe four vegetation cover t��pes are described
in this section. Himalayan blackberry-dominated (evergreen scrub-shrub)cover types are found on
the slope above the west side of the depression. One sample plot(SP-1)was established in this cover
type. Sample plot 2 (SP-2) was established in a Pacific willow(Sulix lucidcr var. /usia��dra)/spiraea
(S��irueu dor���Iasii)association (palustrine broad-leaved deciduous forested wetland) found in the
depression. "r�vo sample plots(SP-3 and SP-4) were established in broad-leaved deciduous torest
cover type(red alder or black cottonwood/red alder-dominated associations).
Evergree�r Scrr�b-slrrub
SP-2 was established approximately 60 feet east of the east wall of the ezisting mobile home.
Although there are scattered red alder and black locust saplings in SP-2,dense I�imalayan blackbem�
typifies this cover type. Osoberry was present in the sample plot. Other scattered shrubs that ���ere
observed in this cover type include salmonberry• (Rc�bus s1�ecicrhili.$)and vine maple (,9re:��
Ecolo�ical Solutions 4 20p5-pp;
March 12,2005
I
� 1
, �
S
circinalum). Towards the north end of this cover type, there are a few red elderberry(Sambucus
racemosa)and Lnglish i�ry(Hedera helix). I3ecause only 33%of the dominant plants had FAC
wetland indicator status in the sample plot,this cover type does not meet the hydrophytic vegetation
criterion (see SP-2 in Appendix B). Photograph 2 (Appendix C)shows the structure of this cover
type near the south property boundary.
Positive indicators of wetland hydrology were absent. Soils were saturated at a depth of 18 inches
and depth to free water in tl�e test pit was greater than 18 inches. Because there were no positive
indicators, the wetland hydrology criterion was not met. ',
There were two horizons in lhe soil pit. The surface horizon consisted of eight inches of very dark
brown (lOYR 2/2)gravelly sandy loam. Below this from a depth of 8 inches to more than 18 inches
�vas a brown (lOYR 4/3)to dark yel lowish bro�vn (1 OYR 4/4)gravelly sandy loam. There «�ere no
redoximorphic features or other positive indicators of hydric soil.
lf�'etland Deterntination �
None of the jurisdictional wetland parameters (hydrophytic vegetation, wetland hydrology, or hydric
soil) were present. Therefore, the sample plot and cover type are upland.
Palrtstrine Broad-/ea►�ed Deciduous Forested {t'et/and
SP-2 was established approsimately 40 feet cast of SP-I in the center of the topo�raphic depression
that traverses the site from northwest to southeast. This cover type is characterized by sapling-sized
trees but also contains small areas of persistent emergent vegetation. Dominant plants in tt�e sample
nlot were Pacific willow, black cottomvood, spiraea, and creeping buttercup(Rarrunculus r-eE�e»s).
I limalayan blackberry and soft rush (Ju�tcus e�jzcsus)also were present in the sample plot but not
considered dominant species. Other species present in the wetland but not in the sarnple plot include
red alder and reed canarygrass(I'halaris ar:a�dinacea). Because 100%of the dominant plants had
FAC and FACW ��-etland indicator statuses, the hydrophytic vegetation criterion was met.
Photograph 3 shows the structure of this cover type at SP-2.
A number of positive indicators of wetland hydrology also were present. Soils were saturated to the
surface. After about ten minutes, standing water in the test pit was present at a depth iortwc� inches.
Numerous oxidized rhizospheres were present in the surface horizon. In addition, ���ater stained
leaves and water marks were apparent. The presence of multiple positive indicators met the ���etland
hydrology criterion.
The duration of saturation appears to have contributed to the accumulation of organic matter and
black (I OYR 2/I)color of the gravel ly sandy loam in the surface horizon. The texture of the surface
horizon ���as identified as a gravelly sandy loam but was on the borderline of being a silt loam_
l3eneath the surface horizon from a depth of eight to more than 16 inches �vas a dark gra}ish brown
(2.SY 4/2)gravell� sandy loam. There ���ere a few. fine, faint mottles in the subsurface horizc�n.
�I�hesc �vere s� small and laint that a clear cnlc�r could not be determifled. A distinetive sulfide ode�r
- - ----- --- ---
--- - --
- _ ______- -_
I�:colo��ical Solution� 5 ZOOS-(10 i
March 1?, 2005
� j
� I
(rotten egg)emanated from the test pit during excavation. Sulfide odor and a chroma of 2 in a
mottled matrix are positive indicators of hydric soils.
Wetlanrl Deter»ti�ration
All three parameters were met and the cover type is a wetland. Although many of the trees are �
saplings and relatively small, it is classified as a palustrine broad-leaved deciduous forested and
scrub-shrub wetland,according to the U.S. Fish and Wildlife Service's wetland classification system
(Cowardin et al. 1979).
According to Renton Municipal Code(RMC)4-3-OSO.BJ.b, this appears to be a Category 3 wetland �
because it is t�ydrologically isolated, has been hydrologically altered(channel in the center and outlet
modified, and disturbed by historic land uses. These disturbances have contributed to the support of
populations of non-native and invasive plants, including Himalayan blackberry, reed canarygrass,
English ivy, and holly. According to RMC 4-3-OSO.M.6.c, standard buffer widths for Category 3
wetlands are 25 feet. Approximate wetland boundaries and buffers are shown in Figure 2. To
determine the precise location of the wetland boundaries and buffers,these will have to be
surveyed by a licensed land surveyor. '
Broad-leaved Decidtrous Forested Upland
I�wo sample plots(SP-3 and SP-4) were established in upland broad-leaved deciduous forest cover
types. SP-3 is located approximately 80 feet north northeast of SP-2 near the wetland boundary to the
rigl�t(east)of the two mature black cottonwoods shown in Photograph 4. SP-4 was located near the
head of a cut channel in the wetland. The channel was about a foot wide and of variable depth
throughout its length, which ran about two thirds of the length of the wetland.
Dominant plants in SP-3 were black cottonwood, red alder, beaked hazelnut, osoberry, and sword
rern (Polystichum mur�itum). The red alder association near the north property boundary(SP-4)was
sirnilar but lacked black cottonwood in the overstory. ln addition to red alder, the dominant plants in
SP-4 included Scouler willow(Salix scoulerianaj, salmonberry, Himalayan blackberry, sword fern,
and English ivy. Other species common in this cover type but not dominant in either of these sample
plots included Pacific dewberry(Rubus ursinus), bracken fern, holly, Robert's geranium (Geraniun7
rnhertraitrmt), and vine maple. Because only 40 to 50% of the dominant plants had FAC or wetter
indicator statuses, neither sample piot met the hydrophytic vcgetation criterion.
I:colo��ical Solutions 6 2005-Op�
It4arch I?. 2OOS
Figure 2. Approximate locations of sample plots, delineated �vetland boundaries, and
requirc�l «�rtl:�n�l buffet•s.
, �
V �Y.��.+� a� 4' . }: _,�yc. ' . .
'3z•��. - � ' ��,
w � _ ��:��� �:; '�
�� Y a•�, Y" '�
,a �.
�:�� � _
_ �, . �, ��
�° - • � �-_
..� � •. �-} ��.., ��`#-�i�.,*.��-'� :�- �=1 a.;+� �r- ,�'�>' �'+l.+'::q aTm�;
-�! � 's� �..-- - .s`��a r �.,�` ��v; .�. `�.ir+»>;.�: '�'� �t,�, r-;. �,
_ ,..
�. ��� � � .�� ,�' " _,��.: _ ,
_:��� � _ ��s_ ,..
��re � �
� �,'''' .��. �
_ ,�� ��,
� �
�,
APPRnS. DF.I.I\E:�I'F.D
„� _ �� f t{ 1AI7i� 11f�t�t�l:l `1
E] i�
t x• � I
�. .� 1.. . ';��.�� e.. �'.
�+ ��'
.��*'. �.� ' .
,p� - �_ �� 1�����Z���. _�-��171%1 ��� i� ���17
!�"-_ 6' - s� _
- - �� � �� -.�
,.ti. � . a . ..� -
S � r
� - �`
�
�.�� . �� �
� � � I
,;i: '�i � ��&- `� S' � 1
s
s�:' �e. •� - •��. :�'
_ y-'
-��-
� �. .gs� + _. S
_ I �l I�L�I I !� 1 )I F111 E �'� ��,. �,
- ' :.. +e ...
> -
__,_.-:. �3{)L\llc1K�_ ' :-
,�� ,3,�.;
<:`
�
-�� -
�� � �
��w� �j �
'�- "' 'T�.
_ a� �
� �i �,. ��..�w - - _ , : —
��` + . . `�A 1� � �
1�C)�r [�U Sl aLE
NOTE: WETLAnD BOUNUARIH:S AND BGFFH:RS ARF. FOR Il.-
LllSTRATIVF. PCRNOSr;ti ONLF. A SI:RVF.Y' 1S RF:QU[RED'TO '�
DETF,R�IINE THEIR LOC:11'10\ MORE AC('t'R:�1'EL}'.
Hydrologic characteristics varied appreciably betweemthe two sampie plots. Although surface
topography was similar in both being about a foot higl�er than the adjacent depression, there were no
positive indicators in SP-3. By comparison, soils were saturated at eight inches and standing water
was present in tl�e test pit at 12 inches after about five minutes. Because tl�ere were no �vater marks,
drift lines, or other hydrologic indicators present, it �;�as assumed that saturation to the surface is
unlikely to be present for sufficient duration (30 consecutive days)to meet the hydrology criterion.
`rl�e cut channel may effectively drain the area and explain the lack of hydrologic indicators.
Soils varied some�vhat between the two sample plots. Soils at SP-3 �vere sirnilar to mapped
Alderwood gravelly sandy loam series soils containing a surface horizon of eight inches of very dark
brown (I OYR 2/2) gravelly sandy loam. Below this was a B horizon extending to a depth of morc
than I6 inches of brown (7.SYR 4/4)gravelly sandy loam. 'I�he subsurface iiorizon contained a fe��.
medium to coarse, yello��-ish bro«�n (lOYR 5/6) soft masses. By contrast. the soils at SP-4 were
transitional between upland and wetland soils. The surface horizon consisted of about eight inches c�f
very dark brown gravelly sandy loam (lOYR 2/2). This was subtended by more than eight inches �f
dark grayish brown(lOYR 4/2)gravelly sandy loam wiih some redoximorp�ic features. A few�,
medium to coarse and distinct,yellowish brown (lOYR 5/6) sofl masses were widely scattered
throughout the 16-inch soil profile. Soils in SP-3 contained soft masses but the chroma ���as too
hright (chroma =4}to be considered hydric. Subsurface sails with a chroma of two and some
red�,�imur��hic fc�tures (alhcit not particularl�� �trc�n��) in SP-4 c�,n�titutc�l a niar�inall�� h���lric sc�il_
«'etlu�i�f Ueternrinatio�r
None of the required parameters were met at SP-3. Onlv one of the jurisdictional criteria wa;
satisfied at SP-4 (hydric soils). Therefore. both sample plots and c�ver tvpes �vere consider-ed uplan�i.
A summary of the wetland detennination data is presented in l able I.
Table 1. Summary of wetland determination data and wetland classifications.
Sarnple Wetland Standard
Plot Vegetation Hydrolog3� Soils Determination/ I3uffer''
Classification'
I Non- No Nonhydric Upland evergreen shruh '
hydrophytic mineral
2 Hydrophytic Yes H��dric PFO/SS1C ?� feet ',
mineral Category �
3 Non- No Nonhydric Upland Deciduous
Hydroph}�tic m ineral Forest
�1 Non- No Hydric Upland Deciduous
{Ivdrophytic mineral Forest
Palustrine �veiland classification follows Co�vardin et al. 1979. Vl'etland ratin� follows KMC 4-3-OSO.B.7.b
, �
- Standard buffer�vidth is per RMC 4-3-OSO.h1.6.c.
------- - -- - ---_ --- - ----
f:c��l����ical ���lutions 8 �005-0(13
March I?. ?OOi
Wetland Functions
�
Closed depressional ��etlands on the site appear to provide lo�v to moderate levels of all functions.
VJildlife habitat functions appear lo«-to moderate due to habitat fragmentation and degradation. �I
Duvall Avenue NE and commercial and residential development isolate�vhat little remaining habitat '
exists on the site. Habitat structure is relatively simple, consisting of primarily immature forested i
wetland vegetation. T'he entire wetland appears to be seasonally saturated and inundated, providing a
! ' seasonal source of water and possibly limited breeding opportunities for amphibians. The abundance
, . of invasive species appears and lack of large woody debris and snags appears to limit habitat i
diversity. In addition,buffers have been altered and consist predominantly of invasive species or
� ' lawn-like area around the western half of the wetland. There is no buffer to the south and little to the I
� - north. Onsite the buffer to the east is a deciduous forest,but offsite there is a single family residence '
, and understory vegetation has been removed or replaced with lav�m and ornamental plantings. All of '
' the forested areas on the west side of Duvall Avenue NE were recently cleared as part of a new 'i
- development projects. This and other development have eliminated potential migration corridors
. Hydrologic functions appear to be relatively low considering landscape position,the small size of the I�I
� wetlands,and their isolated nature. Flood storage and desynchronization appears low because there is �
' little live storage,no apparent stormwater conveyance to the wetland and no outlet or downstream
_ receiving waters. ,
Water quality funcrions likewise appear relatively limited. T'hough the wetland may effectively trap
_ and retain pollutants re�eived from atmospheric deposition, it does not appear to receive or treat
stormwater-bome pollutants. Upland soils in the adjacent buffers appear to be relatively well drained
gravelly sandy loams that likely rarely if ever convey overland flow to the wetland.
,
CONCLUSIONS
T'here is a small,Category 3 wetland on the site. The wetland is hydrologically isolated and altered
by a channel in the middle of the wetland as well as adjacent land uses. Historic and existing land
� uses have contributed to an abundance of invasive species in the wetland and the wetland buffer.
These impacts have altered plant diversity and appear to limit wildlife diversity and habitat use.
According to RMC,the standard buffer for Category 3 wetlands is 25 feet.
�
.
Limitations
Work for this project was performed in accordance with generally accepted professional practices for '
the nature and conditions of the work completed in the same or similar localities, at the time the��ork
��as performed. It is intended for the erclusi��e use of 1�1r. niohlmmad Baboldashtian as it pertains to
the referenced prc�pert��. All findings���ith respect to sensitive areas determinations,
classifications,and buffer requirements are preliminary and subject to��erification by� all
Ecological Solutions 9 2005-003
htarch I?. ?005
i
�
�
i
i�
appropriate regulatory agencies,including the City of Rentoa The City of Renton and other �
regulatory agencies make the final decisions and are the ultimate authorities on atl code ��
interpretations. No other warranty, erpress or implied, is made. �,
REFERENCES �
Cowardin, L.M., V. Carter,F.C. Golet,and E.T. LaRoe. 1979. Classification of Wetlands and �I''
Deepwater Habitats of the United States. US Fish and Wildlife Service, Office of Biologicai
Services, Publication FWS/OBS-79/31, Washington, DC i
I
Ecology(see Washington State Department of Ecology) �,
Snyder, D.E., P.S. Ga{e, and R.F. Pringle. 1973. Soil Survey: King County Area, Washington. U.S. Il�i
Department of Agriculture, Soil Conservation Service, U.S. Government Printing Office, '
Washington, D.C.
Washington State Department of Ecology(Ecology). 1997. Washington State Wetlands
Identification and Delineation Manual. Publication No. 96-94. Available online at
http://w�vw.ecv.wa.�ov/bibl io/9694.html.
', '
i
�
F.cological Solutions 10 2005-003
ti1arch 1?,200J
__. _
;�,.r ,� �:,� � - ,,. . � ,:,» ��.: .
i.Mn tv ♦,� L � >�ef '+r�..„'V 4'a :j (� +�,. �x ti �k��''r'" 1: "�v''' �'C!
..�.o-t 1 , i_..5'� .:,>,w `m,y,,:� 4i �8.�� .' ` �9�x �w� . r e^i�`�"����YK a .:,����ni.�������Sri �nriu 4 :�„z�'y !.. �4
�
1 N .ti. �,. �}'�1 A 9He '/R �6�*�y a. ,Y: {� ,"p +�, �.y y' � y�.� t �y.�
�-, . ,... 'SL .f� •. , - .. �.�..uRYS�.. ;��F'� �.V YO�. �%p"�� I' �.�:'�d'��44�.'F+i�����16 y'f�.,l4s�a~$ ECa��f���7:���`' F-tb-GZ� .� .�����. ��a.�
.�
y �• 3. .
a �
�4 . . ... 4< ....... . . . . .
i . _
j -; . �i a j51� � >i� .;� � .�s� c:Gd c a e't s.tc���� _ .,.
y, 3a4 � �� � �: �= Fi,.. � �
: . . . .! :'"�4 :�,k:} $, ,s'_ �5. ''"+�€, -. :i�. �t . . . t ;. � . t .
1 � . � e ,4 0` x . . . . . � .� - . � � . . � _ . . � � ' . .
; . , . . ._. .� � . -. �. . . . . . . .. . . . .
. � . .,. �F � . . . . _ � - . .
APPENDIX A
METHODS
�
I
!
�
t
, ML7'liOUS OF llLTE1ZMINING WETLANll
CHAIZACTERISTICS AND CLASSIFICATION
WETLAND CHARACTERISTICS
Unless an area is a problem area or atypical situation, the Washington State Department of Ecology
(Ecology 1997)and the U.S. Army Corps of Engineers(Corps 1987) require that the following three
characteristics be present for an area to be identified as a wetland: (1) hydroph�rtic vegetation, (2)
I�ydric soil, and (3)wetland liydrology. Tl�e following subsections detail tl�e metl�ods used to
determine whether these characteristics are preseni on site.
Hydrophytic Vegetation
To determine whether an area has hydrophytic vegetation,the dominant plant species in each
representative plant community are identified. Ecological Solutions uses the method described in the
1989 Federal Manual for Wetland Identifying and Delineating Jurisdictional Wetlands(FICWD
1989)to determine the dominant plants in each stratum (tree, shrub, herb). Dominant plants are those
species witt� percent cover values tl�at, when ranked in descending order of abundance and
cumulatively totaled, immediately exceed 50 percent of the dominance threshold number, plus any I
additional species with cover values comprising 20 percent or more of the sum of the midpoints tor a
given stratum. The dominance threshold number is equal to 50 percent of the sum of the midpoints '
for a given stratum. Cover classes(and midpoints)are as follows: T= <1 percent(none), 1 to 5
percent(3), 6 to 15 percent(]0.5), 16 to 25 percent(2L'.S), 26 to 50 percent(38), 51 to 75 percent
(63), 76 to 95 percent(85.5), and 95 to 100 percent(98). Reed (1988)and Reed et aL (1993) have
evaluated many plant species common in western Washington,and have assigned a wetland indicator
status to each based on [he species' probability of occurring in wetlands (Table 1). A plant ,
community dominated by species com►nonly found in wetlands(OBL, FACW, and FAC) meets the
criteria for hydrophytic vegetation.
Table 1 Key to wetland indicator status.
Code Wetland Indicator Status Probabilitv of Occurrence in Wetland
013L Obligate wetland species >99 percent
PnC1�' Facultative wet 67 to 99 percent
FnC Pacultative 34 to 66 percent
FACU Facultative upland I to 33 percenl
UPL Obligate upland <I percent
n plus(+)sign or minus(-)sign is used with the facultati�e indicator categories to more specifically
�iefine the rezional frequency of occurrence in wetlands. The+ indicates a more frequent occurrence.
-__ - ---- - - -- ----- ------
I;c��l���ical Soluti��ns n-I � -�- -���larch I I_ 21)I)�
Hy�ric Soil
�'o determine wl�ether an area has hydric soil,test pits are dug and the soil color and otl�er
characteristics are examined. Soil in which any of the following indicators is present meets the
criteria for hydric soil:
Low-chroma matrix- Soil with a low-chroma matrix typically develops when mineral soil is
saturated or inundated for sufficient periods of time to result in anaerobic (oxygen-less)conditions.
Anaerobic conditions cause elements common in soil, particularly iron compounds, to exist in
reduced forms tl�at are usually bluish, greenish, or grayish in color. Soil colors are determined using
a Munsel) color cl�art(Kollmorgen 1995), which uses abbreviations to describe colors; e.g., lOYR
2/1. In the abbreviation, the last number indicates the chroma; a chroma of 1 (without mottles)or 2
(with mottles) in the subsurface horizon are positive indicators of hydric soils. Soils with a matrix
cl�rotna of 2 witf�out mottles or redoximorphic features are usually not considered hydric.
Mottles or redoximorphic features- In seasonally saturated wetlands, fluctuating water levels can
trap air bubbles in the soil. The air pockets allow magnesium and iron cornpounds in the soil to
oxidize, forming rust-colored mottles(spots or blotches). Mottles found in soil with a matrix chroma
c�f�2 or less often indicate the soil is hydric. ,
Accumulation of or�anic matter- Organic soils form under anaerobic conditions tl�at contribute to
low decomposition rates. These low decomposition rates result in the accumulation of organic
matter. Organic contei�: is considered high if the soil is composed of more than 20 to 30 percent
(range fluctuates depending upon other soil characters)organic material by weight in the upper 32
inches ofthe soil profile.
Other hydric indicators- Other positive indicators of hydric soils include histic epipedons, sulfide
or"rotten egg"odor, aquic or peraquic moisture regimes, presence of soils listed as hydric soils, and
presence of iron or manganese concretions.
(�ther indicators as specified by Ecology(1997) also are used te determine the presence or absence of
liydric soils.
Wetland Hydrology
�I�o detennine whether an area has wetland hydrology, the area is examined for inwidation, soil �
saturation,or shallow groundwater tables, and other h_ydrologic indicators. In the Puget Sound region
c�f western Washington, an area in which soils are saturated to the surface for at least 12.5 percent of
the gro���ing season (30 days)meets the criterion ror wetland hydrology. Hotivever, seasonal changes
in water levels and antecedent conditions must be considered when an area's hydrology is evaluated.
tiVhen �vetland hydrology is not present at the time of the site visit, it can be inferred Gom the
presence of any ot�the following hydrologic indicators: �i•atermarks on vegetation, drift lines.
sediment deposits, �vater-stained leaves, surface-scoured areas, wetland drainage patterns, or oxidized
f�c�ilo!,ical Suluti��ns A-? March I I, 2U05
* ,
;
root channels. I lowever,as noted in the Washington Wetlands Identification and Delineation Manual
(F:colo�ry 1997), not all indicators are given the same weight and some are more reliable indicators
tlian otliers. I'resence of I�ydrophytic vegetation and hydric soils also are strong indicators tl�at
wetland hydrology is likely present.
Classificalion r
Wetlands are classified according to Classification of Wetlands and Deepwater Faabitats of the United
States(Cowardin et al. 1979). Under the Cowardin classification scherne, wetlands and deepti�ater
habitats are grouped into systems based on shared hydrologic factors. "The systems described in
Cowardin et aL (1979)are palustrine, marine,estuarine, riverine, and lacustrine.
"1'he palustrine system includes all non-tidal wetlands dominated by trees, shrubs, persistent i
emergents, mosses and lichens,and all such wetlands that occur in tidal areas wl�ere the salinit� �l�i�• '
to ocean-derived salts is below 5 parts per thousand. Wetlands included in the palustrine svste►n are
tl���,� �;��i�,iu��iil�, r�����it���l t�� ,�, ni�ir,l���., ;��:�n��,,. h�����. t�n.. ��r;iiii�.. �,����� . .�n�{ in���ri�iitt�iii �,,�n f.
I'ulu:,liinr ��cll.in�l, ,u�. �li�icl��i int�, �Itt.,��, l�� tl�r �lui��in�iiit ������t<it���ii: 1 �,i��,Ic�l ����t�ancl� ,ii��
dominated hy trees greater than approximately 20 feet tall with 30 percent cover, scrub-shrub
wetlands are dominated by woody shrubs, and emergent wetlands are dominated by non-�voody
plants. Other common palustrine wetland classes include unconsolidated bottom (<30 percent pla�
cover)and ayuatic bed. These latter two classes are usually permanently inundated areas and
sometimes referred to as open water.
I:colc���ical Soluti��ns A-3 - — March I I. ?0OS
IZEFEItCNi.ES
Corps(U.S. Army Corps of Engineers), 1987. Corps of Engineers Wetlands Delineation Manual.
U.S. Army Corps of Engineers,Technical Report Y-87-1, Waterways Experiment Station,
Vicksburg, Mississippi.
Cowardin, L.M., V. Carter,F.C. Golet, and E.T. LaRoe, 1979. Classification of Wetlands and ,
Deepwater Habitats of the United States. U.S. Fish and Wildlife Service, Office of ,
E3iological Services, Publication FWS/OBS-79/31, Washington, DC.
L'cology(Washington State Department of Ecology), 1997. Washington State Wetlands
Identification and Uelineation Manual. Ecology, Publication No. 96-94, Olympia.
FICWD(Federal Interagency Committee for Wetland Delineation), 1989. I�ederal Manual for
)dentifying and Delineating Jurisdictional Wetlands. U.S. Army Corps of Engineers, U.S.
Environmental Protection Agency, U.S. Fish and Wildlife Service, U.S. Department of
Agriculture Soil Conservation Service, cooperative technical publication, Washington, DC. ,
Kollmorgen Corporation, 1995. Munsell Soil Color Charts. Kollmorgen Corporation, E3altimore,
Marvland. '
Reed, P.B.,Jr, 1988. National List of Plant Species That Occur in Wetlands: Northwest
(Region 9). U.S. Fish and �Vildlife Service, Biological Report 88(26.9), Washingt<�n_ I)C
Keed, P.F3., Jr., D. Peters,J. Goudzwaard, 1. Lines, and F. Weinmann, 1993. Supplernent to List
of Plant Species'I'hat Occur in Wetlands: Northwest(Region 9). LI.S. Fish and W'ildlife
Service, Supplement to Biological Report 88(26.9),.Washington, DC.
�
�
I;colo��ical Solu[ions 11-�1 R�arch I I, 200�
} � �� �
,/l� pa1-�{�j��h�yyl g � �¢� ,, ��
� .�� r�i � ..: �� . �.,s ... � F�'Yvs� J�wl� ��' ��- '�$ .
. 1 . 's Y 1��T` ��f�'NT! Y'��iNR?`�4�!�-� . .. �y�3 Y� '�f� . � � '' x� �F�'n '�°.�� '� �'
r.�
� y ���� �•f r ��rL�v' '�. x { i-�a- a�_ *m�j� y �yj,s y� a' x a6�§r�:t a a��y f'k � +y�
�� . . . � . ,.. ' . M1.�_,. 7�:� �"�i 5ht. rfi:t;+wp'��'{a7lW i�`r�1.'1'e:S��1- ,c5t�s��,"'f�.T��tA11�Wi4'htH'�'^ltT3e±fi�� .,��jl� H. tiii�� ��•�'�.tF��b�r"�"
. ..... ....... .. . . , . . .. . . . .. �.l . ._.. . _ . . ., .., . :. a a . ... . . . . ',
i ..� . . . � . . . .. , ., �'1' . . .. � � . � . . .. �. . - _ .
� . , ;�.t :�. L�_'.� .�r�+ ..i_. ti �.ii i� ai r.7.-` yp�rd.n .��}�,�,s yF-� :�_;.>i4 ;-7
.. '4 0 ,C. {�
. , . .., . , . . . . ,,..�"d'� . . . .. . .. .. � . . . .
' � i,�t'iA !3 .�1.� {• �'.''j i, ..����� J �,4 �.. 1 y., f:. Y P t: .. ''. . .
,.� �.
. �
� . ' •.. ... .. .. . . � . . . . . .. . . . . . t . - . .. . . ..
� � . . . � - � �I
I
APPENDIX B
DATA FORMS
� Routine Wetland Uetermination
(Ada �lcd from the�Yashin�ton State VVetlands Identitication and Uclineation Manual)
I'rojecUSite: 276 Uuvall Avenuc NG I)ate: ?r I R�(IS
Applicant/o�+�ner: Eiaboldashtian County: King
Investigator(s): S. Luchessa State: W'A
S,'T�/R: N�t�' I5. T 23 N. R 5 G
I�o normal circumstances exist on the site? � Yes ❑NO COI11111UIlllV 1O: Ilimala}�an blackberr��
Is the site significantl��disturbed(atypical situation)? ❑ Yes � No association
Is the area a potenlial problem area? ❑ Yes � No 1 ransect ID: i
lix�lanation of at ical or roblcm area: Plot I l�: SP-I
VEGETATION (* —doininant lant s ecies usin�the 50/20 rule; mi�l oints are shown in parenlheses folla�vin�;°o cover)
1'lant S ecies Stratum °%cover [ndicator Plant Species Stratum "b cover Indicalor
:�th�tr.t ruhra* �l� 30(20.5) FAC
i
Rnhinici/�serrdoacaciu"` �T 20(20.$) PACU
lZrihr�.c di.cc•ulvr* SI I 80(8�.�) FACL!
Uemle�•ia cerasiJormis SI I S(3} PACU
Hl'UROPHY"TIC VEGETATION INUICATORS:
°jo af dominants Of3L. f�AC W. & F/�C: 33°n(I of 3)
Check all indicators that apph-and explain below:
❑ Visual observation of plant species ero�rin� in ❑ Physiologicalireproductive adaptations
areas of prolonLed inundation!saturation � WeUand plant database
❑ Morphological adaptations � Personal knowledge vf regional plant cominunities
� "f�echnical Literature � Other(explain)
Hydrophytic ve�;etation present? ❑ Yes � No
Rationale for decisioivRemar�s: <SO°%of the dominant plants have FAC or wetter wetland indicator statuses.
HYUROLOGY �
Is it the vrowing season? � Yes ❑ No Water Marks: ❑ Yes � No Sedimenl Deposits: ❑ Yes � Nc, li
Based on: ❑ Soil temp(record temp) DriR Lines: ❑ Ycs � No I)raina<�c Patterns: ❑ Ycs � \'o I
� Other(ex lain) Plant�rotivth
I�cpth of inundation: None O!�idized Root (live roots) I:ocal Soil Surve��: ❑ Ycs � N��
Channels �I?iit: ❑Ycs �1�k�
Ucpth to free ��ater in pit: >18 inches fAC Neutral: ❑ Yes � Nu �1%ater-stained Leaves:
❑ 1'es Q Nci
Depth to saturated soil: 18 inches
Check all that apply&e�plain belo�+�: Other(e�plain):
❑ Stream, lake or ga��e data
❑ /�erial photo��ra�,hs
❑ Other
�Vctland h�drology prescnt'.' ❑ Ycs � N�
Ilationale fbr decisi��n,remark,: I hcre are no positive indicatc�rs ol���etland li�drolo���.
Koutine Wetlan� Uetermination
(A�a rted from tlie VVasl�in�ton State�1'cllands Identification and Uelineation Rlanual)
ProjecVSite: ?76 Duvall Avenue NE Date: 2%I 8%OS
Applicant/owner: f3aboldashtian County: King
Investigator(s): S. Luchessa State: � WA
S/T;'R: N W 15, 'I�23 N, R 5 f�
Do normal circumstances e�ist on the site? � Yes ❑ No Community ID: Pacific ti�illo���lspiraea
Is the site sie�niiicantly disturbed(atypical situation)? ❑ Yes � No association
Is the area a potential problem area'? ❑ Yes � No I ransect IU:
Ex�lanation uf alv ical or �roblem area: F�1o1 ���� SF�-�
VF,GGTA7�ION (* - dominant lant s ecies usin T the $0/20 rule; mid oints are shown in parcnthescs follo�vin£°�o cover)
Plant S�ecics Stratum °ocover Indicator Plant S�ecies Stratum °�cover Inclicatur
.Su/i.��h�ri�lu* l� 45(38) f�ACW �
Pn��r�lr�.s hcrL�nmi%cru* "l� 10(10.5) f�AC
,S��irucu duus,�lu.crr* SII 55 (63) FAC�1�
Rirh��.e cli.sc•�,Inr• S�I 10(10.5) FACU
RUl71N7C1lIl(.S!'C�J('/L�'* H 10(10.5) FACW�' �
.hinc•u,s e1Jt�.cu.s H T(0) FACW
HYUROPHY��IC VECETATION INDICATORS: '
°,o c�f dominants Of31.. FACW. R PAC: 100°•0(4 ot�4)
Check all inJicators that appl��and explain below:
❑ Visual observati�m of plant species gro«�in?in ❑ Ph�•siologicalireproductive adaptations
areas of prolon�ecl inundationisaturation � Wetland plant database
❑ Morpholo�ical adaptations � Personal kno��led<��of re�ional ��lant communities
� 'I�echnical Literature ❑ Other(explain)
H��drophytic �e�ctation present? � Yes ❑ No I
Rationale for dersion%IZemarks: nll of�the dominant plants have FAC or FACVd indicator statuses. � �,
HYDROLOGI"
Is it the ��ro++in�season? � 1'cs ❑ No Vl'ater Marks: � Yes ❑ No Sediment f)eposits: ❑ Yes � No
Based on: ❑ Soil temp(record temp) Drifi Lines: ❑ Yes � No f�rainaee Patterns: � Yes ❑ N�
� Uthrr(cx��lainll'lant ��rcnvth
Uepth c�f inunciatii�n: None Oxidized Roc�t(live roots) Le�cal Soil Surve��: ❑ Yes � N��
Channels � I''nt: �Yc�s ❑Nu
Depth to fi•ee ��ater in pit_ ? inches 1=AC NeutraL• � Y'es ❑ No W'ater-stained f.caves:
� Ye5 ❑ Nc>
Depth to saturated soil: At surtace
Check all that aprl� �� explain helo�ti�: Othcr(explain):
❑ Su-eam. lakr or��a�e da[a
❑ /lerial phuto��raphs
❑ (>ther
VVctl:�ncl h�dre�lo�;� prescnt'! � 1'es ❑ No
kationale f<ir ei�cisi�m remarks: �I here are man���ositive indicators of�cetland 1i��lrole����. l her�fi�re. the sam�le E�Ic,t ancl a,�rr I���r
are ��ctland.
� Routine Wetland Determination
(Ad.i �tc�l I'rom thc VVashin�ton Stalc Wctlands Idcnlilicalion and Dclincation Manual)
Projcct!Site: 276 Uuvall Avenuc Nl; Date: 2!18!OS
ApplicanUowner: l3aboldashtian Countv: Kin�;
Investigator(s): S. Luchessa State: V4'A
S'T/R: N W 15, "1�23 N, R 5 G
Do normal circumstances exist on the site? � Yes ❑ No Community ID: F31ack co�tonwoodlred
Is the site significantly disturbed(atypical situation)7 ❑ Yes � No alder association
Is the area a potential problem area`' ❑ l'es � No ��ransect ID:
G��lanation of atv ical or �roblem area: Plot I D: SP-3
VEGETATION (* =dorninant lant s ecies usin�� the 50'�0 rule; mid oints are shown in �arenlheses followin�°�cover)
I'lant S ecies Slratum "o cover Indicator Plant S ecies Stratum 3o cover fndicator
Puprilus!�ul.sunriJeru" T' S5 (G3) 1"AC Rt�hus s��ec•�c�hrli.s S1� 10(10.�1 I=AC-E
Ah�v.s�•t�hrc�* T� I� (10.5) FAC Rtrhti.s tn�si�ttcc SI I 5 (�) FACI�
C'urvlus c•oriu�ln* SII 30(38) PACU lle.r ac{trifolitmt til l "I ((l) UPL
llcmle�•iu cerusi/i,rmis'� SI I I S (10.5) I�ACU J'nh�,stichtun mtn�ilr��n* I I 2(1(20.5) F/�CU
Acer circinnh�m Sli I S (10.5) FAC- Prcridn�nr ayurlrrarm 11 'I�(0) F/�CU
Ri�hrcc discx,l�,r SH 10(10.5) FACU CfPPUl717!/11 POI)Cl'11011tll)i H �I�(Ol UPL
HYURONHYTIC VEGETATION INDfCATORS:
°��,of dominants O[3L. �ACW,& PAC: 40°'0(2 of 5)
Check all indicators[hat apply and explain below:
❑ Visual observation of plant s4�ecies zro��in� in ❑ I'hysioioeical reproductivr a�laptations
areas vl���rolvn�rcl inimdation/saturation � \�1�eUand plan[ databasr
� Morphological adaptations � Personal kno�cledge of re��ional plant cummunities
� fechnical LiteraWre ❑ O�her(explainl
H�•dro�ih��tic vc�ctation present? ❑ Y'es � 1v'o
Rationalc lor decision%Ilemarks: <50`;'0 of the dominant plants have FAC or��etter indicator statuses.
111'UItOLOG 1'
fs it the �:ro�r ing scason`? � Yes ❑ No V�'ater Marks: ❑ 1'es � No Sedim�nt l�eposits: ❑ Yes � No
[3ased on: ❑ Soil temp(record temp) Dritt Lines: ❑ Yes � No [)rainagc Patterns: ❑ Yes � iJo
� Other(cz lain) Plant gro���th
[)epth ol�inundation: None Oxidized Root(live roots) L,ucal Soil Surve�: ❑ Yes � No
Channels �-12 nt: ❑l'es �No
Dcpth to li•ec �+ater in pit: �16 inches I�AC Ncutral: ❑ 1'es � No \�'ater-stained Lea��es:
❑ �'es � No
l�epth to saturated soil: 16 inches
Chcck all that a���il� K ex�lain b�lo�v: Other(ex�,lain):
❑ Strram, lakc c,r��a;e data
❑ 1lerial ��hotograph�
❑ C)lher
W'cUand h��drolo�;� prescnt'? ❑ 1'cs � No
IZati�malc ti�r decisiun remark5: I hcre are nc�positi��c indirators of��etlan�l h�drolo���. l herrfore. the �aiii��lr��Ic�t anel cc�ver t�Fic arr
u��lancl.
Itoutine Wetland Determination
(Ad:� �tcd from thc Washin ton State�'�'etlands Identification and llclineation Manual)
ProjccUSitc: 276 f)uvall nvenue NG Date: 2/18i05
npplicanUo�vncr: Baboldashtian County: King
Investigator(s): S. Luchessa State: WA
S/T/R: N W 15,'I'23 N, R 5 E
Do nornial circumstances exist on the site? � Yes ❑ No Community ID: Red alder association
Is the site sibnificantly disturbed(atypical situation)? ❑ Yes � No Transect ID:
Is the area a potential problem area'? ❑ Yes � No Plot II): SP-4
I:x lanation ot atr• ical or roblem area:
VF,(:f:TAT10N (* _-dominant lant s ecies usin the 50/20 rule; mid oints are shown in arentheses followin�°�o cover)
Plant Species Stratum °�o cover Indicaror Plant S ecies Stratum °o cover I�r+icator
ilhirv.+ rr�hru'•` l' 60(63) F/�C Hedcru hrli.Y* I I $(3) UPL
.Suli.r.scn�ilrriunc�* �l� 2$ (20.5) FAC
/ltihti.s.cp�c'luhili.c* SII 3$ (38) FAC+
Ruha.s dr.scnlr�r* SH 30(38) FACU
Ruhrrs rn•.crnr�.�• SFI 5(3) FACU
Pn!►'.t•lichrun mrmi�rim* H 5 (3) FACU
HYDROPHI'TIC VEt;ET'ATION fNU1CATORS:
°ro of dominanls Of3L, FACW,&. PAC: 50°ro(3 of 6)
Check all indicators that appl� and explain below:
❑ Visual c�hservation of��I�int species ��rowin�� in ❑ Physiolo�.;ical'reproductive adaptations
areas o1��rolonged inundation�'saturation � �'etland plant database
� Morpholo�_ical adaptations � Personal kno��ledge of regional plant comrnunities
� "fechnical Literature ❑ Other(explain)
H1'droph}�tic�•eKelation present? ❑ Yes � No
Rationale 1��r dccision Remarks: Only 504 0 of the dominants have FAC or FAC+ �veUand indicator statuses. Vegetation is
transitional to more clearly upland vegetation(see SP-3).
HYUROLOGY
Is it thc �.!ro�vin`�scas��n'? � Ycs ❑ No 1�'ater Marks: ❑ Yes � No Sedimcnt Ucposits: ❑ Yes � No
13ased on: ❑ Soil temp(record temp) Drifl Lines: ❑ Yes � No Urainage Patterns: ❑ Yes � Nc�
� Other(explain) Plant ��ro�vth
[)epth of in�mdatic�n: None Oxidized Root(live roots) Local Soil Survey: ❑ Yes � No
Channels�12 oL: ❑1'es �i�k�
Depth to ti-ec �iater in ��it: I� inches FAC Neutral: ❑ 1'es ; No Water-stained Leaves:
❑ Yes � Nu
Urrth to saturatc�J sc,il: 8 inches
Check all that appl� �� explain hclo��: Other(explain):
❑ Sueam. lake��r��a��e dat�j
❑ Acrial photo�_raphs
❑ Othcr
V!'etland h�clrolo�� present? ❑ l'es � No
Rationale tc�r decisic�n remarl.s: I[ is assumed Ihat saturation [o the surlace is not present tbr sul�ticient dw�ation to meet the li�drolo���
criterion (sce n��trs at �he bc,ttom ot�ia��e?l. - -
� -—
� . ... , - � � ., �' � . , ' t �1�. .��;.
�'��' P R� T� A• �! �-�1- 1) •:�"� �'/ 4 �.?j• .k! TM .'��
1
� .
j ,
s 1_a��) ,,��I�
l . � . . . �j�yf��,y��+W�,.�� �..� �xti►� _ �' -� �- . .. y ,r.r +r��'� � �"'Y�SAy7�'�' �� I
I . .�.�'+ ..:i --:>.+ n��'.yl. �,' .,.r-.:� .. yn �►r '.�i'
I . . - . . . , . , . . - . .. s. . i�
. . . . ,.. . � - . . _ . . . . �� . �'.
APPENDIX C
SITE PHOTOGRAPHS
�
Appendix C 2005-003
Baboidashtian Site Photos
��� -
g� �, _
R... i�� • ���
+li , �.
, r �-
�� �
,�� ��+. �. —`j � :�.
*,
� � t "!*' „�� �I .� ,�,
`_:
r
"a r. +s�
�.0 ' _ , -- _. `` � .-�
� . . . — f.� YN. .T6� F�.f
.`�:i. �- `r,�G
t .t���
J�. -a a ��.�.�. `'�4
�. " b_
'V .K .4` a..�` �
�4 v, .�^� N�i-.. ��. • + +
��_4 :�vs. �. -
:c�_�., , .. •►�f'"r �.JL _ . . , � , ,'�. .�'r..�y
Photograph 1 - Looking NNW at mature Douglas fir beneatf�
which is a mixed native and non-native plant association at the
Baboldashtian site.
: 's +-�'� ,��;� �.. �, t�-� •,� ..� rti �� q( ,
�L�l ����'����y� T,��. !+� � L t k������ �., 1�� � T
. 1 ��.
� , .�;�� •yp .. r
��•�l�..l�c;!%'.��- a���r ��'�'y���".�v�i�� �:'�v,�,1!>�'� o�f�;.y\� �;,.t}�y- :11ti�7�y 1 ��'� y����
�� � Y�� ��p} 1.����d`A� �c � ��, S� � �:.� '' �.'1 Sl��
��l`� �`J:' i�'tE`��.i!Z��bT�� �S�1}�: 'f i��' 'Gc ��� ��� � ti� ♦ t1��_.
ir
<-i+^`�'K"��, � �ji + .Y fa,y�w. y C r �. "t 2 ,'�'��,.,L�jr.�l� ►
't' '�: � ..,�y�+r•'- � '2 S�4 �`^(r .i�'�i«'�� J �r ' ; �
�h��• R��wr��d�r�'1lyy,,��F ,�1�1 .�jy�i,_ `.`�'s^� '�,�,..���� �'V rt¢ .
rl 4 .d.•ri F '��r�r;° !!tl'���}'V�ej'��,��rl�dfc>r�;,d- i�}1e- �}
� ♦ �Sf('��i - Y��7 '!�' r i � k'w'�= j�? a> �� f �
r �, yy,
. y: � �P-f•z���!� j,{'' ��:�:t A��,�'¢�i,:�� ��.`�,ii •- ' R''+.jr�
,��� .1,1 ,y���y tN-..I{'{�Ct�t�N7 r?; ������i }pY���� y �.� �a�
Ey
��S� ��1*i N��I,YI"F ��Yi4l��. i►,�����]k�• �1
50(' �r }i��r�f � j� �� i • .
S w t pa ,�. � �
♦ .�a, .$� �.� ;,'is'�'�jf�� , •',:.
i, i..`��,� � � 1� , ;� .t > +�'.o.; *s;: .{
T t T � �r� .� �i ._ � . . ��Ql � � ry�: .`j �''
y� T� f _. �V� ��(y.. �-��^.l� ,. t,a e �` y?. S �(�;�.
.'�.F' ,y�y' � '7'if� n4M'� t� { V �y }'��wj��y¢�.�T"
��� > �t� g S'
���r��� �7r�� ��Nj 1�.
��; v:�'t � S� ��#'+''�?'�'.
� �
:�t�+a+���, ,�' .. �
44 .j�"'f�Q'�� ��'t ��• J� ' Y� ,,. 1���
�Yy� u ����`�� $\
41���5���� �Y: C
_ �- �- S -_Ya ' - `" t�tr,i�-,M' -
•���';�_►-�h:xY s
. w ,�
,`�'�Sq���
���
,��'
.pr�
�AI' .
{
���
Photograph 2 - Looking S at f iimalayan blackberry-dorninated
association and SP-2.
' •�' • 11 11
: . •� • . - • • �
t► i :�� ' � � . � f�� r
:, t , ��:���
.r � ;'` \�,_
.�
`,� � � ,�fY. t
� �- ' .• � '��
',' ``° ``�. , .x• j ; , • � ^�y� j�` s`
A� .� ,j ?y;' �s :� �� y'-f�'";�(, �r � ����t���ii.
- +'��'�•`��1: 't'." , _�". '�,.�r ��
' ., ������.
, :� -. �:� ; 4,: �;'' :�-�.
� . � . _ , �. +rr.4�` 'T�• ea .�a
'N ..Ili�' ���yi�-yfa.. �t'
v, cr
° �' � .i�' ��;�e
i�'3`.. � il..�. ;. �+ i!'�;�
� ( +
t4� �1'' ��j �� ' 4 !'�L ��` I+ � ,.
• �-� a � }4 i��! a'�,� � �S,j�"' Z ��
� %`�'�1 �4' T .a �` �] ��Y �.. ' t'
:, '� K r, 71.+���a � 9� y c � ��' c�. �.
t�N�fr' � ]�� i'�75.��,•,.' ,,�'.��.i ` `��is��' x��"�'.��,`� ,
l . �: 1 �'' ��e L ..'' �Jl 4 t , .1.,;
' � ,� .f„a, ,.;� �.� � ,� ��� ``+,� S
5� , �� ^.r 3' -+J �}��k.����1w���,',l'�3 S.� t.:i�.
�,. :, �: . �•� �\���;.. 1�=,�sr•'�4r�1�.. � ;�������,�.}.
r ��; w�, t �'- Ay, . •i t ti y� ,�j , f. , ,` .--.,;.
w� •�� '! '�;,a� �� ,'i i. 5 .� .��\r �� .��`2���jy"s �F.� �`i �;:�__ :�1
- ' t: ..i, �a�. -•� •�'•� -��t./i: :y'• �
� , �R�j' r r +�!' ��, 3►i�`�_ �^' '
.�•'j�� �w�..�l$�� ��,,`�xK�ti ��.,7y,,�.���,�7 ��,���.-r,�f�. '6:.
.J �• i,yi • f-!c, '�. �i4.��'!�L!^ �� :• r .�: � y:. . ,
.` ^ ;i�. - f3,.��� 'L. .�jt�—:'� y �i � �. .� . �:1`
�..�j; « ''al� }�, ii. +� F' �� . �• .:a' ' "��
r '('r �•, �a,,,!c • ;���a.� -•l'- •4;� ���
� • • • • `�• • � • . •
� . • • •�• . • • • � � • • �
• — • � � �
���
�'�' � '+`.
t�'�• `� �`' { � �
;_
'�j'„�: .t.,
.���1�.�: :�a
�y. � 4 �
�; '� ,t�:� E �� � .i...
.t., -i a..�. � ���E.
��y.���-.i�; '�� �. ' •s:; , ` !i� 'Ke,,:�'� , ,� �"4
.t����f�� ��„�� °`y .� �'�i��y'�{r • �; �!.�y�. '.}
�1 j 7T�
f-•.r.--�� s j; , ?. �r i,, t `'`a� {���� e �s 7y'� �� 1 *.
�"'� '�,A�.r �'��.. f 4 iP����l �t }�r�� �K._..`� �.��`, ��' r ,; �
I� �►t r/
` �� ..� �.� �, ��'t';�1''•��Ee.; ;;.���+�`:" �.�.� .r'1'�`�'+
_i .F- l r�r ,1!� r`h�!,��d i; �:r��1 i��,i. :�J".
�.;�i�. ,,;� ,�y�• ,� ,�_yty����,��- v�,��, .� ,�t��,. �►`` '",�
�~�`' 'J1,�l4 �Sj't�§L,� I�,t•�i�,"' �., ���.�'�F''�1��'1.'v, �\�ti,k t `� .. '' �t3� „
"�.7+f f� : �/ `� .l i �r`�w. ��F �� ��� �' �' •k'�" �t
�,=�.t�. �.�- :;.s. :�y� •:.�,f� �. . + -�. � �:� �
�, ,
`•'=:•i�'�i.:/ .�``�i,��,�''� �-�'�',6;��'••�'�. • n�. �t,• !��r,r����' �'''GEt rR -
.i.�� ���� - :_ �s � , �� ��1��'' ! 1�'�� � �}-
,rr�� + � r: � �!�f' 1����., � i 1� '�•.' 1�/ �,'.
-j.-;l'�j��,.s��./+ s 1�''��,''"'i;_. � +'� „�, '�:,,, � i ! ,� r� t �S .t�
r �= �� .,���, -�;. �> � � �,';l
1� / � S_- ; .1 M �
�.��� �j ���'•� .'�` !.,.��,5- .` �.� �ri�� .+� , j •..
s.
� • • • . • � � � • •�
� • . � • ��� � � •' • � � • •• . •
•. • .• . � •� � • • �