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��� �vY�p���l ,s �fyv,rFcl pr,� C�i�� 5 •�nc�a�c�� . Ilu v:,� c { � cve' fva� l�- , <br /> . inZF-ead ��.� cpC�1 Wa•FC'rt ¢ I� , wwid a ilcw +he p�n� -1�, b � �; t ;.. F-o <br /> ` -}-��e 0:e �7 f�rrcn�l �� se,l- c�s; o�� •�cr 'f-l�.c veye-�at <<� 5w � lt . <br /> l,) I `lC(" I �"CM'> '�'� 3 �- `� 1'1 � � nCCC� •�c. V-i i�ClL� � !"iSC('� C7rE I .�li�1c�'�'Cf� W �?Ll 3 �. <br /> IiEKOR !► NDOII J� ,�, .�2 • <br /> ' �lz71�9 <br /> TO: Gordon Witcher ��U „r'J�l� <br /> � �v <br /> FROM: Jane Zimmerman �I� <br /> DATE: May 17, 1994 �� � <br /> SIIHJECT: Plan Review, SEPA ,�94-i1, Cintas Laundry <br /> �/This site is required to meet current City standards with <br /> �'C respect to stormwater quality enhancement for pavsment <br /> runoff. Current City standards have. a preferred order of <br /> treatment, with infiltration basins to be providad, if <br /> feasible. An infiltration basin to treat the majority of <br /> the site would not be feasible given the current site layout <br /> - the pond would not meet City setback requirements. <br /> � Therefore, a wetpon 's reqitire�by the Cixy_standarda-t-o <br /> treat the_maj ority cf—tLe SitQ_s�unQf�. �(�,.� .� L�a �� F a s�ct� •(��r a sw� i e <br /> a�nrarz 1�-qZ C�c�q�., � w:+h Sen�.e. mcr.{1Fi � a�ficnS .�,L �rw. cic '+fti: �er+i cn o� �i-L.�. <br /> A second issue is the SEPA requirement to maintain hydroloqy uret-����a <br /> in the native growth protection areas to the west of this �Pr�irco� �'� <br /> project. This water, if it is to be pavement runoff, must y� �, S,�rF��,a <br /> also be treated prior to discharge. in this case, it �a� , �, � <br /> appears that a small infiltration basin, located just to the <br /> west of the parking area, might be the best solution. <br /> Additional discussion of this item follows later in this <br /> memo. <br /> Comments made in the rest of this memo assume that the <br /> current grass-lined swales will be replaced with a small <br /> infiltration basin and a wetpond, both designed to City <br /> standards. Comments commonly made on designs of these <br /> facilities are included for the applicant's use, although <br /> the City�s Design and Construction Standards should be <br /> consulted for a full listing of the City's requirements. <br /> �CALCULATIONB <br /> Netoond• <br /> The stage-storage relationship of the pond is needed to show <br /> that the pond has the capacity to store the required wetpond <br /> permanent storage volume and any live detention volune. <br /> The wetpond design volume is determined separately from <br /> detention volume. The wetpond design volume is equal to the <br />