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4, <br /> Verizon Communicati <br /> ons-Stormwater Site Plan Everett, WA <br /> 0 <br /> Based on the Contech Stormwater Treatment System Calculations, shown below, each 27" <br /> cartridge can handle up to 22.5 GPM, therefore 31-27" cartridges are to be installed within <br /> an 8'xl 6' StormFilter Vault. <br /> A�vi.&\ITCAILI <br /> III teg••e`:�:■ . Size and Cost Estimate <br /> STORMWATER <br /> `� SOLUTIONS INC <br /> OP. e _1 G. 4.r' '_. . <br /> Prepared by Kathryn Thomason on December 15,2009 <br /> ( f £") u <br /> LBA Verizon—Stormwater Treatment System — mm <br /> I Everett,WA <br /> Information provided: '- :` * t t t A <br /> • Structure ID= SBUH lrlr t CO k , - <br /> I . Total Area(acre)= 9 12 <br /> • Percent Impervious= 80 c;4 G,;G s-�l e ,(i.,1 i m � <br /> • Water Quality Flow,WQF(cfs)= G <br /> 1 55 , ��� - 4_. <br /> • Peak Flow,Q100(cfs)= Offline . <br /> • Height of cartridge(inches) 27 - ,� -"} 1 i�10).-fi <br /> U . Cartridge flow rate(gpm) S 2)c���v. C l . <br /> • Drop required from inlet to outlet 3.0 s <br /> (feet) <br /> II Assumptions: r'V "[c i,) <br /> • Media=ZPG cartridges r-,-; <br /> • Presiding agency=City of Everett 4' <br /> 0 Size and cost estimates: <br /> The StormFilter is a flow-based system, and therefore,is sized by calculating the water quality flow rate associated <br /> with the design storm.The water quality flow rate was calculated by the design engineer using the SBUH method <br /> 01 and provided to CONTECH Construction,Inc <br /> Structure Water Approximate No.of Estimated <br /> QualitySystem Size <br /> ID Flow Depth Cartridges Cost <br /> SBUH 155 6' 31 8'x16' $81,100 <br /> 01 A pre-settling chamber will also be installed as part of the water quality system, upstream <br /> of the Stormfilter Vault. Based on the StormShed output file shown on the previous page, <br /> ill 24,516 CF of water quality volume shall pass through the proposed pre-settling chamber <br /> before entering the Stormfilter Vault. The following calculation is per the Everett -F ( -' <br /> Stormwater Management Manual, Chapter 3 section 3.6.1, Wetvault/Tank sizing. vc , t. <br /> y` :' <br /> V=1676.5 x (24,516 CF / 86,400 Seconds) x 6' Depth = 2854.21 CF , it ` ;r t' , , <br /> t 2854.21 / 6' Depth = 475.70 SF ;t°/ +s' `. 0 <br /> I. 475.70/ 10' Wide = 47.57' Length ,-- t O ;) �/ tyk <br /> '�"` <br /> A 10'x50'x6' pre-settling vault will provide 3)0,00i1CF of storage and will be more than tklti \,C <br /> -11 adequate to handle the proposed 6-month, 24-hour stormwter flows. i'A) <br /> rY,( <br /> 01 PACLAND Job# 50183001 Pale 22 r . <br /> i' I, <br />