931 BROADWAY TEUTSCH STUDENT HOUSING 2018-03-07

Geotechnical Report Proposed Student Housing: 931 Broadway Street, Everett, Washington December 8, 2015 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 , 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. It should be noted that about 5 feet of undocumented fill was encountered in the existing upper parking lot area (see boring logs PG-2 and PG-3), and about 2'/z feet of undocumented fill was encountered in the existing lower parking lot area (see boring log PG-1). As such, depending on the design footing subgrade elevation, over-excavation to removed unsuitable soils from below the proposed footings may be required. All footing over-excavation should be backfilled with properly compacted structural fill, or Control Density Fill (CDF). 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. Where existing fill may be present below the proposed floor slab, we recommend partial removal of the existing fill, and replaced with at least one foot of properly compacted structural fill. The exposed bottom of the excavation should be properly compacted to a dense and unyielding condition before placing the 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 3/4-inch, clean crushed rock (less than 3 IS-275 931 Broadway,Everctt Pa��e 7 PanGEO, It1C.