1004 BROADWAY EVCC STUDENT HOUSING - REPORTS & FINAL DOCUMENTS 2017-01-13

Geotechnical Report - _ __ , .sed Proposed Apartments: 1002, 1006, �ind 1008 Broadway Sireet, Everett, WashinUtou May 12, 2015 sliding resistance developed between the concrete and the subgrade soil. Passive soil resistance may be calculated using an equivalent fluid weight of 350 pcf, assuming foundations are backfilled with structural fill. The above values include a factor of safety of 1.5. Unless covered by pavements or slabs, the passive resistance in the upper 12 inches of soil should be neglected. 4.2.2 Perimeter Footing Drains Tooting drains should be installed around the perinleter 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. Rooi�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 fonr�s 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 forins 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 till, Any over-excavatioils, 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 3/4-inch, clean crushed rock (less than 3 percent fines). The capillary break material should meet the gradational requirements provided in Table 2, below, Table 2— Capillary Break Gradation Sieve Size Percent Passing 3/4-inch 100 No. 4 0 — 10 15-04R 1008 [3roadway, Revised Page % PanGGO, lnc.