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ryane@mc2-inc.com From: Barbara A. Gallagher <BGallagher@robinson-noble.com> Sent: Thursday, September 20, 2018 3:53 PM To: Ryan Egolf Cc: Rick B. Powell; Barbara A. Gallagher Subject: RE: Silver Plaza detention vault bearing capacity You're welcome, Ryan. Glad to help. From: Ryan Egolf [mailto:ryane@mc2-inc.com] Sent: Thursday, September 20, 2018 3:08 PM To: Barbara A. Gallagher <BGallagher@robinson-noble.com> Cc: Rick B. Powell <RPowell@robinson-noble.com> Subject: RE: Silver Plaza detention vault bearing capacity Hello Barbara, Thank you so much for your quick response on this, it is very helpful. I think that 6000 psf will be more than enough bearing capacity. I don't think we will see more than 4000 psf on the soil below, and that is with Seismic. Thank you again, Ryan D. Egolf, E.I.T. Junior Engineer MC Squared, Inc. (360) 754-9339 From: Barbara A. Gallagher [mailto:B�aIlaaher a robinson-noble com] Sent: Thursday, September 20, 2018 3:02 PM To: ryaneC)mc2-inc.com Cc: Rick B. Powell; Barbara A. Gallagher Subject: Silver Plaza detention vault bearing capacity Hi Ryan, Thank you for your call earlier. As we discussed, the detention vault is planned to be 11 feet below grade and has preliminary dimensions of 11.5 feet wide x 48 feet long. While we encountered glacial till at about 3.5 feet on the south side of the site, we only explored to a depth of 6.5 feet, so we did not observe the soils at the proposed bottom of vault. Presuming the glacial till extends to the bottom of vault elevation, it will provide a bearing capacity of 6,000 psf. Please let us know if this will suffice. Thanks again, Barbara A. Gallagher PE I Senior Engineer Robinson Noble, Inc. I Hydrogeologists. Geotechnical Engineers. Environmental Scientists. 17625 130th Avenue NE, Suite 102, Woodinville, WA 98072 ( 425.488.0599 j cell 206.227.0105 www.robinson-noble.com �'