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t� � �� <br /> .� <br /> �� ��� - � f�� �� , <br /> � , , . � <br /> � � �I� � <br /> consulting enginea5 1/ � ' SEP 1 ,8 18R0 <br /> September 4, 1980 � � � I , � <br /> J <br /> City of Everett Enain2ering Depart�ent �� \\ % <br /> City Service C2nter <br /> 3200 Cedar Street <br /> Everett, WA 95201 <br /> Attn: Celia Strong <br /> Public S2r��ice Enyineer <br /> Subiect: Fluke �'anu�ac.uring Co. , Fh;se 1 <br /> Dear Celia: <br /> Due to aaree-�2nts neoetiat.ed betr:Een rlul:e htfa. Co. znd the 5oeing Co. , �ti�e <br /> r,ere instructed to redesign Lake "A", the Fluke storm retention lr.ke, to <br /> acconm�date the increzsed storm �,zter runoff from 53.5 acres of 5oeing <br /> property which is no�•:cempletely undeveloped. This land will 6e developed <br /> sometime in the futur� to of`ices, parking areas and landsczping with a <br /> develo�ed runoff coefficient of 0.85. Tnis area is West of 20th Nve. k'. for <br /> some 3300' , betH�een the Boeing Perimeter Road and the Fluke-Boeing prcperty <br /> line. <br /> This 6oeing Co. property runoff novr flo�,�s to 20th Ave. W. (2.5 Ac. ), to Fluke <br /> catch basin `43 (6.4 Hc. ) , to Lake "A" (15.6 + 1.2 + 0.5 = i7.3 Ac.) and to a <br /> swzle that drains across Fluke orooerty to Pov;der ldill Gulch (27.3 Ac. ). <br /> These areas are outlined and identi`ied on drz��ing SD-1, enclosed. <br /> Also enclosed are the calculations sheets 1, 2 and 3 of 3 in which the <br /> required storaae of 236,430 cubic feet is calculated, the 3-30° culverts from <br /> Fsoeinq to La�ce "A" are sized and the lake fluctuation of 1.7 feet is <br /> calculated. On calculation sheets 1 and 2 of 2, the lake outlet control "V" <br /> notch is desianed. <br /> I,'e have enclosed 2 each of all the zbove drawinas and calculations and also <br /> Sh�_'At5 �-11 F�V ���" 3(1(� �-14 FCV ��ri��� Y:f1Clh S�IOk' tfl[' �E'td1�5 Of `_h� (1Ui�et <br /> CDfltl'O� S�YU��7)"� n!1!' ��19 �d�'-^ (?^Sl�f1� "nS�1�Ct1V��)'. <br /> 700 lioyd bioa. c�-pCle. v:� 9A1Ji [9iSi 62�-�=72 <br /> p-i�h'JIOQ� f�S C"i-�.�'n5 FiD'1�Jr1(j .; :���_' <br />