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Exterior Wall <br /> Sloped To Drain Away <br /> From Structure <br /> -Pavement Or 24" Wall Drainage Material <br /> �� <br /> Low Permeability Soil " <br /> Y 2' Min. <br /> Retained Soil <br /> Damp Proofing/Water Proofing <br /> Geocomposite Drainage Board Per Others <br /> mporary <br /> Excav teon Slope s=^ Vapor Retarder <br /> �;- Floor Slab <br /> Geotextile Filter Fabric 6, <br /> 12"Min.Cover Of Capillary Break <br /> Drainage Material(6" <br /> Min.On Sides Of Pipe) 4"Diameter <br /> Perforated Drain Pipe <br /> Not To Scale <br /> MATERIALS: <br /> A. WALL DRAINAGE MATERIAL <br /> 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 Mineral Aggregate Type 17(bank run <br /> gravel)per City of Seattle Standard Specification 9-03.14 when used in combination with geocomposite drainage board. <br /> B. RETAINED SOIL <br /> Should consist of structural fill.either on-site soil or imported.The backfill should be compacted in loose lifts not exceeding 6 inches. <br /> Wall backfill supporting building floor slabs should consist of imported sand and gravel per WSDOT Standard Specification 9-03.14 <br /> compacted to at least 95 percent ASTM D1557.Backfill not supporting building floor slabs,sidewalks,or pavement should be <br /> compacted to 90 to 92 percent of the maximum dry density,per ASTM D1557.Backfill supporting sidewalks or pavement areas should <br /> n <br /> be compacted to at least 95 percent in the upper two feet.Only hand-operated equipment should be used for compaction within 5 feet <br /> of the walls and no heavy equipment should be allowed within 5 feet of the wall. <br /> 0 <br /> w C. CAPILLARY BREAK <br /> Should consist of at least 6 inches of clean crushed gravel with a maximum size of 1-inch and negligible sand or fines.per WSDOT <br /> ° 9-03.1(4)c Grading No.67. <br /> 0 <br /> LL <br /> D. PERFORATED DRAINPIPE <br /> a Should consist of a 4-inch diameter perforated heavy-wall solid pipe(SDR-35 PVC)or rigid corrugated polyethylene pipe(ADS N-12)or <br /> equivalent.Drain pipes should be placed with 0.25 percent minimum slopes and discharge to the storm water collection system. <br /> m <br /> 0` <br /> m <br /> 3 <br /> m� <br /> — o <br /> 0 <br /> 0 <br /> coo <br /> co Wall Drainage and Backfill <br /> L <br /> U <br /> N <br /> O <br /> 0 <br /> 2019-37 Learning Resource Center <br /> Everett, Washington <br /> U <br /> O <br /> 00 m GEOENGINEERS Figure <br /> a <br />