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� <br />��ISION CONSTRUCTION COM�PANY <br />� .Octobx 3, 197 <br />OENEAAL CON7'RACTOR <br />, �C� <br />�.,, _ � �� ' - <br />'fj' i AC KE � �� .L/.r. SGVTT . � �'�Ft �1,; <br />� I ��'/�Ec r/nJ fj �i 2 ES�o NS E %UNGR�-c.'''—' <br />� Tjzo,,,.f v�� /fND/v,� %�utc o; .✓�`; <br />�IO/1MiN < � <br />�f£ �f1R//J.9"Cf E <br />/J�PT, /2 F4 <+2,oi ntc� <br />'� Mr, vizgil scott S /� Su%3M/T 7�0 �d -��� <br />'� � �� Sco�t's Drywall YS T'EM � ,. , <br />y,= 6306 -.212th Ave. S.W. CI TY <br />Fd2 !2E!/i��-v ` � � <br />� ''� Lynnwood, Washington 94036 � � <br />��� <br />North Shore Construction <br />RE: Storm retension for apartment complex <br />// <br />� 3/rq/7�' <br />As-•ime: time of concentration = 10 tninutes <br />so the rainfali intensity = 1.85 (Everett, 10 year, 10 minutes) <br />Undeveloped Land <br />Q = CIA = (.3) (1.85) (16,000) _ .�0 cfs <br />935G0 <br />Developed Project <br />Roofed area = 9269 sq. ft. (c =.9) <br />Landscape�� area = 6975 sq. ft. (c == .3) <br />Parking area = 4761 sq. ft. (c =.9) <br />Q' _ �.9) (1.85) (4264 + 4761) + (.3) (1.f35) i6975) = 0.43 cfs <br />435G0 335�i0 <br />p Q = + 0.2: cfs <br />for 10 minuces sturm = 138 cf mi.nimiun to sture oii site <br />Assume: perk rate oE 15 minul'�es, so ;i71 r�uiu:-r musC be stor.�d for duration <br />of stonn. <br />Drainage 2one H1 - parkiny, paved acc��:..; <br />storage req�irea = L9) (l.if�,) ,.L�.,���) (i�U s�•c.; UJ win.) - L10 ci <br />.I t'���il � <br />Usc 8" Nerf Pip� in 7��" wa:li��l ��i.r,�l, I.ii�.i lcv�.� <br />::tora9e voL me ����r ]iu. Eouc �- <br />�:ol. pipu i VoL �.�r�vcl voi.d:, <br />'c,�l pipe = .35 cf/F. <br />`.�o] yravel = (2'1 (.���) (. � ,� i.i ._ _ . <br />.ut.�l - 0. �,S _� � <br />516-Illitl�AVr:. N.F:.. SU1'1'P: 1715, iiill.l.l?Vllr:. W�A511. UNUO�i Pl10Nli aii3 UiNJ <br />