11.9.17 - Eng. Plan Review Comments - Footing Drains.pdfFrom: Rivera, Chris
To: "John Yuen"
Cc: chris@orideventuresllc.com
Subject: RE: Brackett"s Corner - Footing Drain
Date: Thursday, November 9, 2017 10:42:43 AM
John,
Per our stormwater engineer he's remarks provided below.
"While the one-way valve will prevent backflow from the infiltration systems; it still does not
allow the footing drain system to function as intended. During heavy rains, when footing
and crawlspace drains are most likely to be needed, the system will not be able to actually
discharge. "
"Additionally, the roof drains lines are proposed to be connected behind/upstream of the
valve; this means that any time the valve is engaged (infiltration facility filled to the valve
elevation) flows from the roof drains lines will backwater the footing and crawl space
drains."
At this time the project will need to proceed per the approved designed plans, unless additional
information pertaining to footing drain connections and the infiltration systems can be provided
showing elevations and functional use of the footing and crawlspace drainage.
Also, we have not yet received additional information for the initial four structures (south side of the
subdivision) providing elevations of footing drains compared to tightline connections and the
infiltration system. Please provide.
If you have any questions, please feel free to contact me.
Thank you,
Chris B. Rivera
Engineering Technician
City of Edmonds
121 5th Ave. N.
Edmonds, WA 98020
425.771.0220 ext. 1339
From: John Yuen[mailto:JohnY@Isaengineering.com]
Sent: Wednesday, November 8, 2017 4:24 PM
To: Rivera, Chris <Chris.Rivera @edmondswa.gov>
Cc: chris@prideventuresllc.com
Subject: Brackett's Corner - Footing Drain
Hi Chris,
Please advise on the status of the proposed solution to remedy the footing drain issue for Brackett's
Corner project.
Thanks.
John