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1 <br /> Geotechnical Engineering Report SSGC <br /> Hardeson Road Retail <br /> Everett,Washington. <br /> SSGC Project No. 18072 <br /> September 18,2018 <br /> Embedment Depth (Minimum): 18 inches(Exterior) <br /> 12 inches(Interior) <br /> Settlement: Total: < I inch <br /> Differential: < 1/2 inch(over 30 feet) <br /> Allowable Lateral Passive Resistance: 300 psf/ftx(below 18 inches) <br /> Allowable Coefficient of Friction: 0.35* <br /> ' *These values include a factor of safety of approximately 1.5. <br /> The net allowable bearing pressures presented above may be increased by one-third to resist transient, <br /> dynamic loads such as wind or seismic forces. Lateral resistance to footings should be ignored in the <br /> upper 12-inches from exterior finish grade. <br /> ' Foundation Construction Considerations <br /> All foundation subgrades should be free of water and loose soil prior to placing concrete, and <br /> should be prepared as recommended in this report. Concrete should be placed soon after <br /> ' excavating and compaction to reduce disturbance to bearing soils. Should soils at foundation <br /> level become excessively dry,disturbed,saturated,or frozen,the affected soil should be removed <br /> prior to placing concrete. We recommend SSGC observe all foundation subgrades prior to <br /> placement of concrete. <br /> Foundation Drainage <br /> Ground surface adjacent foundations should be sloped away from the building. We recommend <br /> footing drains are installed around perimeter footings. <br /> Footing drains should include a minimum 4-inch diameter perforated rigid plastic or metal drain line <br /> installed at the base of the footing.The perforated drain lines should be connected to a tight line pipe <br /> that discharges to an approved storm drain receptor. The drain line should be surrounded by a zone <br /> of clean, free-draining granular material having less than 5 percent passing the No. 200 sieve or <br /> meeting the requirements of section 9-03.12(2) "Gravel Backfill for Walls" in the 2016 WSDOT <br /> ifid, Bridge, and Municipal Construction manual (M41-10). The <br /> Ifree-dStandardrainiSpecng aggregatecations zonefor R shoaould be at least 12 inches wide and wrapped in filter fabric. The <br /> granular fill should extend to within 6 inches of final grade where it should be capped with <br /> compacted fill containing sufficient fines to reduce infiltration of surface water into the footing <br /> drains. Alternately, the ground surface can be paved with asphalt or concrete. Cleanouts are <br /> recommended for maintenance of the drain system. <br /> I <br /> 7 <br />