931 BROADWAY TEUTSCH STUDENT HOUSING 2018-03-07

Cheyenne Thompson From: Siew Tan <stan@pangeoinc.com> Sent: Wednesday, June 15, 2016 5:06 PM To: Cheyenne Thompson; BRIAN MATZ Cc: Aya Rojnuckarin; Tim Gabelein Subject: RE: Everett Community College Student Housing- footing drain Hi Cheyenne, As a general rule,footing drain is always required when the ground surface one side of the footing is different than the other, eg., retaining walis or basement walls. The purpose of footing drain is to prevent build up of hydrostatic pressure, _ regardless of whether you have groundwater or not. The footing drain most likely will not see much volume, probably just a trickle, unless there's an unforeseen event such as utility leaks, etc. Siew Siew L.Tan, P.E. PanGEO, Inc. 3213 Eastlake Avenue East,Suite B Seattle, WA 98102 Office: 206.262.0370 Cel I: 206.406.8692 stan@pangeoinc.com . From: Cheyenne Thompson [mailto:cheyenne@dcgengr.com] Sent: Wednesday,June 15, 2016 5:00 PM To: BRIAN MATZ<bmatz@dci-engineers.com>; Siew Tan <stan@pangeoinc.com> - Cc:Aya Rojnuckarin <ayar@urbalarchitecture.com>;Tim Gabelein <tim@dcgengr.com> Subject: Everett Community College Student Housing-footing drain Hi Brian and Siew, We have a few questions about the design of the footing drain system for this project. See attached markup and questions below. Brian- How does the slab on grade foundation of the upper level transition to the basement level foundation?Can we put a vertical bend in the perimeter drain of the main level and tie it in to the lower level perimeter drain? On the south side, the edge of the footing butts up against the retaining wall. Do we need to route the drain under the footing here? If so, at what depth below and would you specify a certain pipe material? There is a similar condition at the north retaining wall along the property line. 1