5900 36TH AVE W PRE APP 015 - 032 - SOUNDVIEW BUSINESS CAMPUS - VERITAS Geotech Report 2025-04-22

Veritas Construction Inc ES-4011.03 June 17, 2016 Page 10 Revised June 22, 2016 Foundations ' In our opinion, the proposed development may be constructed on conventional continuous and spread footing foundations bearing upon competent native soil, recompacted native soil, or new structural fill. Where loose or unsuitable soils are exposed at subgrade elevations, the soil should be compacted to structural fill specifications or overexcavated further as recommended by the geotechnical engineer and replaced with a suitable granular structural fill material. I Assuming the foundations are supported as described in this report, the following parameters should be used for design: , • Allowable soil bearing capacity 3,000 psf* • Coefficient of base friction 0.40 • Passive resistance 300 pcf (equivalent fluid)** 1 * ESNW can reevaluate the recommended allowable soil bearing capacity if heavy column loading (associated with post-tensioned slab construction) is anticipated. **Assumes foundations backfilled with structural fill or poured neat against competent soils. For short term wind and seismic loading, a one-third increase in the allowable soil bearing capacity can be assumed. A factor-of-safety of 1.5 has been applied to the friction and passive resistance values. With structural loading as expected, total static settlement in the range of one inch is anticipated, with differential settlement of about one-half inch or less over a typical column bay spacing. The majority of the static settlements should occur during construction, as dead loads are applied. Slab-On-Grade Floors I Slab-on-grade floors for the proposed residential structures should be supported on a well- compacted, firm and unyielding subgrade. Unstable or yielding areas of the subgrade should be recompacted or overexcavated and replaced with suitable structural fill prior to construction of the slab. A capillary break consisting of a minimum of four inches of free draining crushed rock or gravel should be placed below the slab. The free draining material should have a fines content of 5 percent or less (percent passing the #200 sieve, based on the minus three-quarter inch fraction). In areas where slab moisture is undesirable, installation of a vapor barrier below the slab should be considered. If a vapor barrier is to be utilized it should be a material specifically designed for the use as a vapor barrier and should be installed in accordance with the manufacturer's specifications. Earth Solutions NW,LLC