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6-?/ .--D <br /> rheide <br /> From: Marc McGinnis <marcm@geotechnw.com> <br /> Sent: Thursday January 05, 2023 8:49 AM <br /> To: Christopher.construction@hotmail.com <br /> Cc: rheide <br /> Subject: RE: 22435 - Bruce Christopher Construction (4828 Deleware Avenue) <br /> Following my discussion with Rick Heide of Design Build Services: <br /> 1. For a restrained wall that will be backfilled, an at-rest equivalent fluid density of 55 pounds per cubic <br /> foot (pcf) is appropriate, and <br /> 2. If a seismic surcharge has to be applied, a uniform pressure of 8H pounds per square foot (psf) is <br /> appropriate. <br /> As we discussed, the seismic surcharge is only required by IBC for walls retaining over 6 feet. Considering <br /> that the majority of the stairwell wall will be less than 6 feet exposed once the stairs are poured, it should be <br /> possible to neglect the seismic surcharge. <br /> Marc <br /> Marc R. McGinnis, P.E. <br /> 4. <br /> GEOTECH <br /> CONSULTANTS. INC. <br /> 3, <br /> 2401—10th Avenue East <br /> Seattle, WA 98102 <br /> (425) 260-1116 (Mobile) <br /> 1 <br />