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Geotechnical Report - � iii i ised <br />Proposed Apartments: 1002, 1006, and 1008 Broadway Street, Everett, Washington <br />May 12, 2015 <br />No. 100 0 — 5 <br />No. 200 0 — 3 <br />The capillary break should be placed on the subgrade that has been compacted to a dense <br />and unyielding condition. <br />A 10-mil polyethylene vapor barrier should also be placed directly below the slab. <br />Const�uctioil joints should be incorporated into the floor slab to control cracking. <br />4.4 RETAINING AND BASEMENT WALL DESIGN PARAMETGRS <br />Retaining and baseinent walls should be designed to resist the lateral earth pressures <br />exerted by the soils behind the wall. Proper drainage provisions should also be provided <br />behind the walls to intercept and remove groundwater that may be present behind the <br />wall. Our geotechnical recommendations for the design and construction of the <br />retaining/basement walls are presented below. <br />4.9.1 Lateral Earth Pressures <br />Cantilever walls should be designed for an equivalent fluid pressure of 35 pcf for a level <br />backfill condition behind the walls assuming the walls are free to rotate. If the walls are <br />restraii�ed at the top from free movement, slich as basement walls with a floor diaphragm, <br />an equivaleni flLiid pressure of 45 pcf should be used for a level backtill condition behind <br />the walls. Permanent walls should be designed for an additional uniform lateral pressure <br />of 7H psf for seisinic loading, where H con•esponds to the buried depth of the wall. <br />The reconlmended lateral pressures assume the backtill behind the walls consists of a free <br />draining and properly compacted fill with adequate drainage provisions. <br />4.4.2 Surcharge <br />Surcharge loads, where present, should also be included in the design of retaining walls. <br />We recommend a lateral load coefficient of 0.3 be used to compute the lateral pressure on <br />the wall face resulting from surcharge loads located within a horizontal distance of one- <br />half the wall height. <br />4.4.3 Late�al Resistance <br />15-048 1008 l3roadway, Rcviscd PagE g PanGEO, IriC. <br />