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� <br />Bill Miaray-Ikranage Study <br />, ,�%" ° k �� �� � � <br />,j- � �, <br />� ° �f'� <br />i ��s'S �,"'y,��'S% ��y� � <br />v �� 5�,f� Qq cF <br />� ENGINEER'S ALTERNATE WATER OUALITY COM ENDAT ON:L' �5`� ��� ��('� <br />STORMFiLTER DESIGN tor WATER OUALI�'1': I��Je 2�f ,� � <br />� � <br />A Catch Basin Stortnfiher menufactured�}`' Sto►mwater Menagement, Inc., Portlaod,f y�li <br />Oregon would bc much preferred on this�site for water quality ireatment due to the �� <br />� topogtaphic considerations. The fiher c�ould be bcated within the driv'vig ���R <br />readily accessible for maintc►�a►►ce. 'I'i% Engineer respectfiilly disegrees 1� a a� • <br />Everett open cell roquirement. The onen water cell wi not be easily-eccess+ble-end�.� ,^;f'� <br />m a i n t e n a n c e c a n b e m o re e a s i l v- � Y► w c s�. T h e E n g i n e e r b e l i e v e s t h a t t h e mectianical fiher �^(" <br />can do ihe job for this site and is preferable. The wet pond is provided soleiY based upon <br />city requirements. In the Design Engineer's opinion, this project does not appear to be <br />� well served by the wet pond. _ �ei,,� �v � una�, o a l c�des nof' I. s-�- -f�� �, <br />—��.nmF; iki� as an d(?nia✓� yj✓MQ. ro <br />The Sto �s designed to treat rwia�ff from paved driving and parking areas and ►�as I, c 5' S <br />been ely accept __.for this purpose in many jurisdictions including King County. T,x� �°-j-f� e�, <br />C� �verott has a roved filter use on other similar projects. Runoff from a��-(�'� <br />� approximately 6,000 square feet o Pav area can cePtured an routed through t c�"� � <br />Stortnfilter. The Stormfilter can be sized to treat the nuwff produced by the 6-mon � <br />stortn event for developed conditions. Unlike the wet po►id> the Stom�filter gi <br />, predictable results as long as the filters are maintained ennualh'• There is no <br />thst the plantings in the wet cell will survive. <br />� <br />Paved driving aod parkieg arcn = 0.14 Acrea <br />6-Month Rainfall = 0.99 Inches <br />Tc = ] 0.0 Min. <br />r� <br />1 <br />, ���,�. <br />From Waterworks: 6-Month Developed flow rate = 0.025 cfs <br />100-Ycar Conveyance Flow = 0.09 cfs <br />��,,� �i�w'�' '�l�e w� <br />�-�. n.�A�l�t/�� .� '�'�, �c,f�� <br />��� �����D <br />� �� �� <br />� s��m� �� <br />� 5���� �� <br />������� <br />WGSTGRN I:NGINI°ERS, INC. <br />�,� S , <br />�,��u �a'�'� <br />PROI[CTOI•21 I-A <br />� <br />