2300 KASCH PARK RD 2018-01-01 MF Import

{�r.inu:r, Chin & ��iayo, Inc �� July 18, 198:3 � � � � o � � � City of Everett Public Norks Departrnent �� 19 19A,i City Service Center �`"'�,.,,—•—.�... __ 3200 Cedar Street CPublic�� E�pRp�` Everett, Washingto�t 98201 Works ATTINI'ION: Dan Matthias • SUBJECT: Commmity Transit (C.T.) Bus Barn Project Utility Calculations Dear Dan: Attached are sto�m drain and water/sewer use calculatio�is for the proposed C.T. bus barn project. The drainage c�:lculations follow the City of Everett methods for determin- ing storm drainage rim-off and storage. A przliminary 24" by 36" site plan is also included for your reference. For our design the detention pon3 will also act as an oil/water separator. Since my iast discussion with you, we ;7ave determined that we can store the entire 25 year storm on top of the amotmt needed for oil/water separation. It is my imderstanding that this sheuld save C.T. regional detention charges. The expected water/sewer use for all Phase I buildings (except bus washer) is as £ollows: Peak Peak Peak Average Averag2 Average Inst. Hourly Daily Daily Monthly Voltme Flow Flow Flow Flow Flow Use/Month 75 gpm 49 gpm 32 gpm 13 gpm 8 gpm 28,000 c.f./month '1'he bus washer will be the mc.jor water user on s;ite. The washer is a recycle Lype which reuses its water to wash sub<_:equent buses. In this mcde, 25 gallons of make up water wi11 be requii•ed after each washing to replenish rster lost from carry off by the buses;. If the recycle system is down, the washer can also operate directly from the water supply system. In this mode it takes about 100 gallons to wa�h one bus with each bus taking about one minute to wash. This method would only be used in case of an anergency. r 1� � - � �� , --�� . , �. �C' C. . �� ( ��+� 1- - ll�.. ��7 � .i _ � � l�� )�02 l 1917 First Avenue,Seattle,Washingto�9610' 12061 427-5300 Teles 15?770 Y.Ch,1PF r ��