Laserfiche WebLink
� <br /> , <br /> . � st �' �wr <br /> k f f p IVEb � ��,d� �, 'S 7� �7 << <br /> p .�R,�f,_��- �-�-.- z = , <br /> ;:..,�:<x � CI <br /> N: { I O�I <br /> cunsulting engineers ,� ��� f s«� � <br /> 1 ;, r ii 3�I � �i <br /> October 18, 1979 � �T: 1 a �y ' _ ( � <br /> � - � �� �,„►,J s•�+ � � r� <br /> ,� -�__ <br /> i . . :___ ___-- � ��'► ! <br /> City of Everett !� <br /> Duilding Department , ...----'�� <br /> City Hall � <br /> Everett, Washington 98201 <br /> ���G. �� 2 <br /> Attention: Mr. Kenneth Calahan <br /> RE: Fluke Manufacturing Co. <br /> Building Permit for 20th Ave. West Site <br /> Gentlemen: <br /> Enclosed are four sets of the storm drainage calculations and exhibits <br /> for the above project for your review and approval . <br /> � We have complied with City of Everett requirements and designed retention <br /> facilities to keep the outflow for the developed condition at or below <br /> I the undeveloped, existing runoffs. _ <br /> In discussions with the I3oeing Company, the storm r�noff from 6oeing Co. <br /> � proNerty, south of their north perimeter roat (700 reet south of the <br /> � Fluke/Boeing property line) is now directed to the Boeing Co. retention <br /> facility in Powder Mill Gulch. The only Boeing Col property draining to <br /> the Fluke site is the 700 foot wide are north of the north perimeter <br /> road, which now has a storm runoff of 3.6 cfs to the east swale which <br /> drains into Lake F�, the major detention facility for the Fluke P1fg. Co. <br /> Phase I development. From the design calculations for 20th Ave. lJest <br /> ,,�xtention, the existing 18 inch concrete pipe crossing under 20th Ave. <br /> West has a capacity for 12.3 cfs which will allow a discharge fo 11.6 cfs <br /> fr�m Lakc "A". <br /> The visi*.ors road and parking area drain to another exsiting 18 inch <br /> concrete pipe ci•ossing 20th Ave. West. The existing runoff af 0.4 cfs <br /> �� was held in designing the required underground pipe storage volume and <br /> control orifice. <br /> The storm system draining to the entrance frotn 20th Ave. West is connected <br /> to the existing system in 20th Ave. West at J.fi. ;6 (Sta. 6+82.���jEry�CrRr <br /> than to J.B. N9 (Sta. 10+82.80) , due to the relocation of the en rancP — <br /> road. The allowable discharge was computed as the minimum 3i�erenve'�"TT <br /> between the existing 12 inch pipe capacity and the calculated ptpe'�lbbl; <br /> some 0.6 cfs. <br /> NOV. 8 1��� <br /> 700 Iloyd bldg., seattle, wa 98101 (206) 622-5822 ^ , <br /> anchorage los angeles porfland seattle <br /> • • . <br />