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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 />