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' iEd �'�(���rn�_�����nl�,-u� ScGv�,l�lf �f�ll,�c�S �r <br />.' cn 'tlu 91r��; C l��i�l5<r+,2F 1- ��TJ;:•iT���. <br />3( -/�tLn.� t7��or ii�; !� �>r' n�• �✓, ���.� -zl;, , -n °':v�'.��r��J:i <br />M E M O R A N D U M <br />�1( � r.,�. r C`� cG� <br />e.n � �-�- � � t <br />x'�/L' %�a+it•��Lcvi(� ��I i-�L/ `�FC.'.�l'+ ";.�'l�i;l'� �I'%tl't-F..'� '"lG�l' cuC'/-�Jt:)c� ��-'f/f'�" <br />c9nc�-F(u C%<<I� ��r�.;� laec:� :ncsl�,l-�ci. <br />TOt Gordon Witc.her <br />J�;i� �� <br />FROM: Jane Zimmerman <br />DATE: February 1, 1994 `/ / �/ �� <br />SUHJECT: <br />Plan Review, SEPA �72-93, Everett Clinic <br />at Silver Lake - <br />��F�7�.re � n c l v C'�.c r'�� -( <br />C F �� I L�/1C�Sf (i�'l� <br />p lrJn ��, tG, fb.i 2�X� <br />I have the following comments on the subject project: �� h o F <br />CALCULATIONB C� � l� J� n S . <br />General: ,'/ , � <br />L � ' ' <br />�A site plan showing the different sub-basins would be ��l " <br />helpful in interpreting the drainage computations. �/ll(.�� <br />� If it hasn't been, the wetpond/wetvault/detention system �� � Z / <br />;;hould be sized for runoff from the south parking area. <br />DetentionLw3toona: <br />The d�tention system needs to be designed to meet both <br />Fisheries� standards and the City of Everett standards. <br />�� City standards call for release of the 25 year storm at no <br />more than Y.he 10 year predeveloped rate, which is more <br />strinqent than Department of Fisheries� secondary release� <br />standard. The primary release of 1/2 the 2 year, 24 hour <br />storm can be left unchanged. <br />� <br />The wetpond desiqn volume is determined separately from <br />de�ention volume. The required wetpond design volume is <br />equal to the volume of runoff from the developed site for <br />the 6 month, 24-hour storm, which can be taken as 64$ of the <br />2 year runoff. Per the drainage computations, the wetpond <br />design volume appears to be 4,132 cubic feet, instead of <br />3,416 cubic feet. The live storage appears to be adequate <br />in the pond, but the dead storaqe will need to be increased. <br />City standards require the open water cell of a wetpond to <br />have a permanent storage depth 3-G feet deep. The wetvault <br />�replaces the op�n water cell, therefore the dead storaqe <br />depth in the va��1t also needs to be at least 3 feet deep. <br />Given the aiea of the vault, increasinq the depth will <br />