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206.258.9754 <br /> From:Jelena Vandenhaak<Jelena.Vandenhaak@ContechLLC.com> <br /> Sent:Thursday,January 14, 2021 3:20 AM <br /> To: Katie Herold <Katie.Herold@kpff.com> <br /> Cc:Jordan Drugge<Jordan.Drugge@ContechLLC.com> <br /> Subject: RE: Filterra Bioscape vault downstream of FC <br /> Hello Katie <br /> Sorry about not getting back to you sooner on this one. <br /> Yes, I did talk to the product manager and he came up with the following answer. <br /> "Ideally we recommend 24 hours pumping and then a 24 hour rest period. We recently did some testing on Filterra <br /> media and confirmed that up to 48 hour drain down times were acceptable at 175"/hr. We would not recommend <br /> longer than that without a resting period of 24 hours or so." <br /> Since you are trying to achieve oil control, we would be sizing at SO"/hr, so his last comments is not really applicable. <br /> Overall,the good news is that it would be possible, as the pumps eliminate some of the issues of downstream of <br /> detention system. <br /> But you would be limited to 24 hours pumping and a 24hr rest period,which I don't know if achievable for your project? <br /> Hope this is helpful and please let us know if you wish forward or have any other questions <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 /> avandenhaak@conteches.com <br /> www.ContechES.com <br /> *registered in AZ <br /> From: Katie Herold <Katie.Herold@kpff.com> <br /> Sent:Tuesday,January 12, 2021 3:24 PM <br /> To:Vandenhaak,Jelena <JVandenhaak@conteches.com> <br /> Subject: Filterra Bioscape vault downstream of FC <br /> Jelena- Happy New Year. We spoke briefly during the holidays about the potential to put a Bioscape vault for oil control <br /> and enhanced treatment downstream of detention. This scenario would have a pump that would be dedicated to the <br /> low flow 2-year release rate and could be pumped up to the filter vault. <br /> Have you had a chance internally to discuss whether Contech would approve this type of installation? <br /> Thanks! <br /> Katie Herold, PE <br /> Associate <br /> M 206.258.9754 O 206.622.5822 <br /> 1Tff 1601 5th Avenue,Suite 1600 <br /> Seattle,WA 98101 <br /> 4 <br />