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Exterior Wall <br /> Sloped To Drain Away <br /> From Structure <br /> Pavement Or 24" I Wall Drainage Material <br /> Low Permeability Soil -- <br /> 71=-1 <br /> 2'Min <br /> Retained Soil <br /> Damp Proofing/Water Proofing <br /> Geocomposite Drainage Board Per Others <br /> Temporary <br /> Excavation Slope Vapor Retarder <br /> ,. Floor Slab f 1 <br /> Nonwoven Geotextile • <br /> 411 <br /> 12"Min.Cover Of Capillary Break <br /> Drainage Material(6" — <br /> Min.On Sides Of Pipe) <br /> 4" Diameter <br /> Perforated Drain Pipe <br /> Not To Scale <br /> MATERIALS: <br /> A. WALL DRAINAGE MATERIAL <br /> N May consist of"Gravel Backfill for Drains"per WSDOT Standard Specification 9-03.12(4),surrounded with a non-woven geotextile such <br /> as Mirafi 140N(or approved equivalent).Alternatively,the wall drainage material may consist of"Bank Run Gravel for Trench Backfill" <br /> per WSDOT Standard Specification 9-03.14 when used in combination with geocomposite drainage board. <br /> 0 <br /> 0 <br /> m <br /> B. RETAINED SOIL <br /> y Should consist of structural fill,either on-site soil or imported.The backfill should be compacted in loose lifts not exceeding 6 inches <br /> o within 5'of the wall.Wall backfill supporting building floor slabs should consist of imported sand and gravel per WSDOT Standard <br /> 0 Specification 9-03.14 compacted to at least 95 percent ASTM D1557. Backfill not supporting building floor slabs,sidewalks,or <br /> pavement should be compacted to 90 to 92 percent of the maximum dry density, per ASTM D1557. Backfill supporting sidewalks or <br /> 3 pavement areas should be compacted to at least 95 percent in the upper two feet.Only hand-operated equipment should be used for <br /> compaction within 5 feet of the walls and no heavy equipment should be allowed within 5 feet of the wall. <br /> s <br /> m <br /> C. CAPILLARY BREAK <br /> Should consist of at least 4 inches of clean crushed gravel with a maximum size of 1-inch an heyligible sand or fines, <br /> per WSDOT 9-03.1(4)c Grading No.67. <br /> 0 <br /> D. PERFORATED DRAIN PIPE <br /> o Should consist of a minimum 4-inch diameter perforated heavy-wall solid pipe(SDR-35 PVC)or rigid corrugated polyethylene pipe(ADS <br /> N. N-12)or equivalent.Drain pipes should be placed with 0.25 percent minimum slopes and discharge to the storm water collection <br /> system. <br /> 0 <br /> to <br /> 0 <br /> N <br /> Wall Drainage and Backfill <br /> Casino Road Renovation <br /> Notes: Everett, Washington <br /> m 1. Thickness/location of permanent wall and slab on grade,and <br /> o perimeter foundation shown here to depict intent of wall G EO E N G I N E E R S� Figure 3 <br /> N drainage design.Actual thickness/location of these structural <br /> elements will vary. <br />