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MC SQUARED <br />I N C O R P O R A T E D <br />December 13, 2018 <br />Ting Chen <br />Apex Pacific Builders LLC <br />1510 140th Ave NE #210 <br />Bellevue, WA 98005 <br />RE: Comment Response, Silver Plaza Linear Sand Filter Vault, <br />10521 19th Avenue SE, Everett, WA 98208, <br />MC Squared, Incorporated Project Number 18502 <br />Dear Ting, <br />1235 EAST 4TH AVE <br />SUITE 101 <br />OLYMPIA, WA 98506 <br />(360)754-9339 <br />FAX (360) 352-2044 <br />E-mail: eng®mc2-inc.com <br />I am responding to the City of Everett plan review latter dated December 13th, 2018. My <br />responses will correspond to the numbers used in the letter. <br />1. The design bearing pressure of 6000 psf was used per phone and email <br />conversations with Barbara Gallagher, P.E., the senior engineer at Robinson <br />Noble, Inc. I have attached a copy of the email correspondence for you. <br />2. Sheet S1.0 has been revised to show IBC 2015. <br />3. The calculations now use an active pressure of 35 pcf with a uniform seismic <br />load equal to 8H. There has been no design change to the vault wall. Please see <br />the attached calculations. <br />4. The wall has been designed as a cantilevered wall with an active pressure of 35 <br />pcf. There is no diaphragm to resist lateral loads. There has been no design <br />change to the vault wall. Page 3 of the calculations has been revised to show an <br />active pressure of 35 pcf. <br />STRUCTURAL • FOUNDATION • Civil. ENGINEERS <br />