Terracon completed a geotechnical evaluation and construction materials testing and Special Inspections for a new food store. Undocumented fill, saturated soft silts, peat, and liquefiable sands were identified in soil borings and CPT probes on the site. Terracon worked with the design team and owner to provide the most cost efficient foundation support options. Stone columns were selected along with localized overexcavation of existing fill used for preloading of other pads on the property. Terracon also designed soil nail walls for the developer per the Washington Department of Transportation specifications for widening of the street under Hwy 410 overpass.