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Structural Design Associates <br /> �,, `� 1S1TJ,'ineeI-hW Sti'itcl II,e ICI I(tsf <br /> �'/ \\. <br /> S&19943811 <br /> November 28, 2022 <br /> Attn: Tim Davis <br /> Project Address: 3327 Hoyt Ave Everett, WA 98201 <br /> Subject: West Egress Footing Grade Beam <br /> SDA Ref. #9438A <br /> To whom this may concern: <br /> At the request of Tim Davis this office reviewed photos of the West Stair Egress project to review the <br /> requested footing and footing grade beam alternative. <br /> After reviewing photos and discussing the project with the contractor this office was made aware that the <br /> posts for the West Egress are not centered on the excavated holes. Plastic sleeves were installed to prevent <br /> the hole from caving These sleeves are similar in nature to a Sonotube. A clear distance of at least 1 V is <br /> maintained froth the post to sleeve. The sleeve and post hole extends approximately 46" below grade. The <br /> contractor has opted to install an 1 I"deep grade beam between the posts. The grade beam encapsulates <br /> and extends past the sleeve. <br /> The proximity of the post to the sleeve edge is anticipated to reduce the effective lateral passive pressure <br /> of the post by approximately ''/z of the original 24" sleeve diameter. The grade beam and adjacent slab will <br /> provide restraint on the ground surface. The attached pole footing embedded in soil calculation <br /> demonstrates this reduction in effective lateral passive pressure is negated by the grade beam. Therefore, <br /> the proposed footing grade beam is permitted as an approved alternative to the isolated embedded posts. <br /> To ensure continuity of the grade beam additional reinforcement along the grade beam is required. This <br /> reinforcement shall consist of the following: <br /> 1) (2)#4 hairpins at each end post with a 24" minimum lap length. <br /> 2) (4)#4 hairpins at each center post with a 24"minimum lap length. <br /> 3) Horizontal #4 bars to match hairpin locations, <br /> 4) Reinforcement shall be evenly spaced and a ground clear cover of 3"maintained. <br /> 5) A side clear cover of 1 3/4"shall be maintained between the reinforcement and end of the grade <br /> beam. <br /> 6) A minimum of(2)posts shall be encapsulated by the grade beam system. <br /> 7) Sleeve, grade beam,and topping slab shall be installed in a monolithic concrete placement. <br /> Please contact this office if you have any questions concerning this letter,or for any other assistance. <br /> Sincerely, �� Cov <br /> A <br /> O <br /> Z <br /> i <br /> 343 � <br /> Chris Covington, P.E. <br /> NOV 30, 2022 <br /> 3006 Rucker i\vc, I�vcrctt,\Vi\ 98201 Pli: 425-339-0293 Fax: 425-252-0916 <br /> sdaeverett.com <br />