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Exterior Wall <br /> Sloped To Drain Away <br /> From Structure <br /> Wall Drainage Material <br /> Pavement Or 24" <br /> Low Permeability Soil l <br /> l 2' Min. <br /> Retained Soil l <br /> I •t� Damp Proofing/Water Proofing <br /> Geocomposite Drainage Board Per Others <br /> Temporary <br /> Excavation Slope t Vapor Retarder <br /> �� FloorSiak <br /> Geotextile Filter Fabric r r 6" <br /> 12"Min.Cover Of ` \ Capillary Break <br /> Drainage Material(6" <br /> Min.On Sides Of Pipe) 4":l?iameter <br /> Perforated Drain Pipe, <br /> Not To <br /> MATERIALS: <br /> A. WALL DRAINAGE MATERIAL <br /> May consist of"Gravel Backfill for Drains";per WSDOT Standard Specifioatipn 9-03.12(4),surrounded with a non-woven geotextile such <br /> as Mirafi 14ON(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.0 combination.!ith geocomposite drainage board. <br /> 501 B. RETAINED SOIL <br /> a Should consist of structural fill,either on-site soil).or.lrn.ported.The backfill should be compacted in loose lifts not exceeding 6 inches. <br /> Wall backfill supportig. U)Iding floor�labs'should'consi5tof„imported sand and gravel per WSDOT Standard Specification 9-03.14 <br /> compacted to at 11:4a.55 parcent ASTM b1557.Backfiil riot sopportirig lbuildingfloor slabs,sidewalks,or pavement should be <br /> compacted to 90 to 92 percentof the maximum:dry density,per ASTM D1557.Backfill supporting sidewalks or pavement areas should <br /> be compacted to at least 95 percent inthe upper:two feet.Only hand-operated equipment should be used for compaction within 5 feet <br /> a <br /> of the walls and no heavy equipmentis.hould be allowed within 5 feet of the wall. <br /> x C. CAPILLARY BREAK <br /> 4 Should consist of at least6 inches of clean octushed gravel with a maximum size of 1-inch and negligible sand or fines,per WSDOT <br /> m 9-03.1(4)c Grading No.67.:;::. <br /> 0 <br /> D. PERFORATED DRAIN 11310E`;:':: . <br /> a Should consist of a 4-inch dlameferperforated heavy-wail solid pipe(SDR-35 PVC)or rigid corrugated polyethylene pipe(ADS N-12)or <br /> m equivalent.Drain pipes should be placed with 0.25 percent minimum slopes and discharge to the storm water collection system. <br /> a <br /> o` <br /> a <br /> oLL <br /> a <br /> ei <br /> ei <br /> Wall Drainage and Backfill <br /> --- - <br /> 2019-37 Learning Resource Center <br /> $ Everett, Washington <br /> 0 <br /> U <br /> m m GWENGINEER� Figure <br /> n: <br />