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C 206.258.9754 <br /> From:Jelena Vandenhaak<Jelena.Vandenhaak@ContechLLC.com> <br /> Sent:Tuesday,January 19, 2021 6:00 PM <br /> To: Katie Herold <Katie.Herold@kpff.com> <br /> Cc:Jordan Drugge<Jordan.Drugge@ContechLLC.com> <br /> Subject: RE: [EXTERNAL] RE: Filterra Bioscape vault downstream of FC <br /> Hello Katie <br /> For WQ of 0.048 cfs (2-year release rate), sized for the 50"/hr(per Ecology for oil treatment), you will need 8x6 vault. <br /> This is a standard vault size, and really too small to call Bioscape- I would recommend a Bioscape Vault, which is <br /> essentially an open top vault. <br /> I am attaching some documents that you might fine helpful-one of them showing the elevations of such vault-generally <br /> Filterra's profile is 6-8" of rock on the bottom, 21" of media and 3" of mulch, with several inches of ponding depth <br /> available. There are some possible variation to this, but that is the basic, Ecology approved system. <br /> Please let me know if this helps. <br /> Also, would you kindly remind of the name of the project? I remember talking about it, but apparently I forgot to write <br /> down the name/location of it. <br /> Thank you,Jelena <br /> Jelena Vandenhaak, P.E.* <br /> Stormwater Consultant,King County <br /> CONTECH Engineered Solutions LLC <br /> Seattle,WA <br /> Mob: 206-730-7946 <br /> avandenhaak@conteches.com <br /> www.ContechES.com <br /> *registered in AZ <br /> From: Katie Herold <Katie.Herold@kpff.com> <br /> Sent:Tuesday,January 19, 2021 2:03 PM <br /> To:Jelena Vandenhaak<Jelena.Vandenhaak@ContechLLC.com> <br /> Cc:Jordan Drugge<Jordan.Drugge@ContechLLC.com> <br /> Subject: [EXTERNAL] RE: Filterra Bioscape vault downstream of FC <br /> CAUTION: This email originated from outside of the organization. Exercise caution when <br /> opening attachments or clicking links, especially from UNKNOWN senders. <br /> Thanks for the feedback. Can you tell me again the size of structure needed for a water quality flow rate of 0.048 cfs (2- <br /> year release rate)for the 50"/hr? This would be for the Bioscape configuration. What would my relative elevations <br /> need to be if I have inlet pipe. I don't need bypass since it is pump controlled. Looking at the details online it looks like <br /> the max structure depth is V-5" from vault rim to incoming pipe invert. <br /> Thanks! <br /> Katie Herold, PE <br /> 3 <br />