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0 <br />l3 <br />Sloped To Drain Away <br />From Structure <br />Pavement Or 24" <br />Low Permeability Soil <br />::::::� <br />Retained Soil <br />Temporary <br />Excavation Slope <br />Geotextile Filter Fabric <br />12" Min. Cover Of <br />Drainage Material (6" — <br />Min- On Sides Of Pipe) <br />Exterior Wall <br />Wall Drainage Material <br />' u <br />2' Min. <br />Damp Proofing/Water Proofing <br />-,� <br />Geocomposite Drainage Board Per Others <br />Vapor Retarder <br />,. <br />Floor Slab <br />t` <br />6" <br />Capillary Break <br />4" Diameter <br />Perforated Drain Pipe <br />Not To Scale <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 and retained soil may consist of Gravel Borrow per <br />WSDOT Standard Specification 9-03.14(1) 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 />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 />�I of the walls and no heavy equipment should be allowed within 5 feet of the wall <br />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 />D. PERFORATED DRAIN PIPE <br />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 />Wall Drainage and Backfill <br />Baker Heights Redevlopment <br />Everett, Washington <br />GEOENGINEERS Figure <br />