1020 N BROADWAY EVCC STUDENT HOUSING Geotech Report 2022-10-25

Proposal for Geotechnical Engineering Services Proposed Apartments: 1020 North Broadway,Everett, Washington September 27,2017 4.2.2 Perimeter Footing Drains Footing drains should be installed around the perimeter of the building, at or just below the invert of the footings. Under no circumstances should roof downspout drain lines be connected to the footing drain systems. Roof downspouts must be separately tightlined to appropriate discharge locations. Cleanouts should be installed at strategic locations to allow for periodic maintenance of the footing drain and downspout tightline systems. 4.2.3 Footing Subgrade Preparation Our test borings encountered 2Y2 to 5 feet of fill below the site. The planned excavation to reach construction subgrade elevations should remove most of this fill. However, there is a potential some localized areas of fill may still be present at the foundation subgrade elevation, especially along the east side of the site,where the excavation will be relatively shallow. The fill is loose and would not be suitable for direct support of foundation loads. If fill is encountered at the foundation subgrade elevation, the fill should be overexcavated and replaced with structural fill. All footing subgrade should be properly prepared and in a dense condition prior to setting forms and placing reinforcing steel. Any loose or softened soil should be removed from the footing excavations. The adequacy of the footing subgrade soils should be verified by a representative of PanGEO,prior to placing forms or rebar. 4.3 FLOORS SLABS The floor slabs for the proposed building may be constructed using conventional concrete slab-on-grade floor construction. The floor slab should be supported on competent native soil or on structural fill. Any over-excavations, if needed, should be backfilled with structural fill. Interior concrete slab-on-grade floors should be underlain by a capillary break consisting of at least of 4 inches of pea gravel or compacted 1/4-inch, clean crushed rock(less than 3 percent fines). The capillary break material should meet the gradational requirements provided in Table 2,next page. 17-233 1020 North Broadway Page 7 PanGEO,Inc.