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KPFF Consulting Engineers <br />1601 Fifth Avenue, Suite 1600 <br />Seattle, WA 98101 <br />C 206.258.9754 <br />From: Jelena Vandenhaak <Jelena.Vandenhaak@ContechLLC.com> <br />Sent: Friday, April 2, 2021 1:24 AM <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 />Yes, that flow still works out to be 8x6. <br />When you get a chance, please send any plans/elevations you have- this is an unusual design for us (downstream of <br />detention, pumps...), and I would definitely like to run it up by our managers to make sure everything jives prior to bid <br />know we did an initial check but would like for someone more experienced with this type of application to review the <br />final proposal. <br />Thank you! <br />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 />9vandenhaak@conteches.com <br />www.ContechES.com <br />*registered in AZ <br />From: Katie Herold <Katie.Herold@kpff.com> <br />Sent: Wednesday, March 31, 20214:13 PM <br />To: Jelena Vandenhaak <Jelena.Vandenhaak@ContechLLC.com> <br />Cc: Jordan Drugge <Jordan.Drugge@ContechLLC.com> <br />Subject: RE: [EXTERNAL] RE: Filterra Bioscape vault downstream of FC <br />Jelena- For Community Transit's Merrill Creek Operations Base we are proceeding with the Bioscape vault downstream <br />of detention. In order to meet Contech's guidance for using these downstream of detention (24 hrs online, 24 hours <br />offline) I'm showing two Bioscape vaults. There are two separate pumps that will pump a maximum of the 2-year peak <br />from the detention system and they will be programmed to alternate pumps every 24 hours. Each pump is connected to <br />its own Bioscape vault. This will allow one vault to rest for 24 hours while the other vault is receiving runoff. <br />Can you confirm the 8x6 vault is still the right size for a 2-year peak rate of 0.051 cfs to comply with the 50"/hr max? <br />Katie Herold, PE <br />Associate <br />KPFF Consulting Engineers <br />1601 Fifth Avenue, Suite 1600 <br />Seattle, WA 98101 <br />