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project Tower Relocations - 40-7 "' :g #2 by JRB sheet no. <br />location Everett, WA date 01/19/24 <br />Boeing job no. <br />oen <br />client g <br />16015th Avenue, Suite 1600 <br />Seattle, WA 98101 206 622-5822 Evaluation of Existing Structur <br />Trench Surcharge Design FEB 2 6 2024 <br />CITY OF EVERETT <br />The existing slab -on -grade and concrete tunnel retaining walls were reviewed wither&aP@aAG&8loading by <br />the addition of Shim Mill mechanical equipment. Each unit was assumed to have a maximum operating weight of <br />22,000 lb per cutsheets provided to KPFF. This weight was assumed to be uniformly distributed across the area of <br />the mechanical unit for a uniform slab pressure of 370 psf. <br />According to Boeing Everett "General Engineering Requirements" specification, Section 2.3.4.4 specified that the <br />existing slab -on -grade should have been designed for a uniform live load of 500 psf, as well as other loading <br />conditions. It is assumed that the dead weight of the mechanical unit will not be concurrent with the basis live load <br />of 500 psf. By engineering judgement, the uniform dead load of the shim mill, plus a standard construction live <br />load of 25 psf will not exceed to basis of design of the existing slab -on -grade. No modification is required of the <br />existing slab -on -grade. <br />According to Boeing Everett Geotechnical Report by GeoEngineers dated June 28, 2006, existing below slab utility <br />tunnel walls should have been designed using the earth pressure diagram presented in Figure 3. This figure <br />specifies a lateral surcharge as a function of the uniform slab pressure. Given that the shim mills will not exceed <br />the basis of design slab pressure, by engineering judgement no modification is required of the existing trench <br />walls. <br />370 psf <br />Xr <br />p_ <br />' al <br />d4 I <br />C <br />E v <br />4 <br />JC . <br />_- a _ <br />