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--�� .-_�r.�„� <br /> kff ��;.��, �,,_ - �� - <br /> p � � . _ <br /> `+ , , -, ,. <br /> consuHing enAlneers `j'" SE' 1 = 1M0 <br /> 3eptember 4, 1980 <br /> � �:��1gEc; <br /> _F'� <br /> City of Everett Engineerin9 Department <br /> City Service Center <br /> 3200 Cedar Street <br /> Everett, WA 98201 <br /> Attn: Celia Strong <br /> Public Service Engineer <br /> SubJect: Fluke Manufacturing Co., Phase I <br /> Dear Celia: <br /> Due to agreements negotiated between Fluke Mfg. Co. and the Boeing Co., we <br /> were instructed to redesign Lake "A", the Fluke storm retention lake, to <br /> accommodate the increased storm water runoff from 53.5 acres of 8oeing <br /> property which is nowcompletely undeveloped. This land will be developed <br /> sometime in the future to offices, parking areas and landscaping with a <br /> developed runoff coefficient of 0.85. This area is West of 20th Ave. W. for <br /> some 3300', between the Boeing Perimeter Road and the Fluke-Boeing property <br /> line. <br /> This Boeing Co. property runoff now flows to 20th Ave. W. (2.5 Ac.), to Fluke <br /> catch basin #43 (6.4 Ac.), to Lake "A" (15.6 + 1.2 + 0.5 = 17.3 Ac.) and to a <br /> swale that drains across Fluke property to Powder Mill Gulch (27.3 Ac.). <br /> ThPse areas are outlined and identified on drawing SD-1, enclosed. <br /> Also enclosed are the calculations sheets 1, 2 and 3 of 3 in which the <br /> required storage of 236,430 cubic feet is calculated, the 3-30" culverts from <br /> Boeing to Lake "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 designed. <br /> We have enclosed 2 each of all the above drawings and calculations and also <br /> sheets C-11 Rev "C" and C-14 Rev "A", whcih show the details of the outlet <br /> control structure and the lake design, respectively. <br /> 700 Iloyd bldg., sec le, wa 98107 (206) 622-5822 <br /> anchorage los angeles portland seattle <br />