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� <br /> —EXTERIOR WALL <br /> SLOPED TO DRAIN <br /> AWAY FROM STRUCTURE <br /> � <br /> PAVEMENT OR 24" � � �'ALL DRAINAGE MATERIAL <br /> IMPERVIOUS SOIL� \ <br /> REfAINED SOIL—�''; Z� MIN. <br /> ,\ <br /> C+',MP PROOFING <br /> TEMPORARY�\ <br /> EXCAVATION SLOPE—� —VAPCR RETARDER <br /> \ ��LOOR SIAB _� <br /> , ' 6" MIN. <br /> {l � <br /> 12" MIN. COVER OF CAPILLARY BREAK <br /> DRAINAGE MATERIAL q" DIAMETER <br /> (6" MIN. ON SIDES OF PIPE) PER�ORATED <br /> DRAIN PIPE <br /> NOT TO SCALE <br /> Materials: <br /> A.W�LL DRAINAGE MATFRIAL: May consist of washed 3l8"to No.8 pea gravel.�I!ernatively lhe wall drainage <br /> malerial may mnsist of"Gravel�ackfill lor Drains"per WSDOT Standard Specificalion 9-03.72(4), surrounded with a <br /> non-woven gcotextile such as Mirafi 140N (or approved equivalenQ. <br /> E3. RETAINED SOIIL Should consisl of struclural LII,eilher on-site seil or imported.The backfill should be compacted in <br /> loose lifts not exceeding 6 Inches.Wall backfill supporting building 11oor slabs should consisl of imported sand and grav�l <br /> per VdSDOT 8tandaM Specifiwlion 9-03J4 compaded to at leost 95 percent ASTM D1557.Backfdl not supporting <br /> 6uilding floor slabs,sidewalks,or pavemenl should be compacied�0 90 to 92 percenl ot the maxim�m dry density,per <br /> ASTM D1557. Backfill supporting sidewalks or pavement amas sho:.�U be compacted lo at least 95 percent in the upper <br /> two fcet. Only hand-operaled equipment should be used for�ompaction within 5�ee�of lhe walls and no heary <br /> equipmeN should be allowed within 5 feel of the wall. <br /> C.CAPILLARY BR[AK:Should consisl of al leas�6 inches of clean crushed grevel wilh a maximum size of 1-1/2 inches <br /> and negligible sand or fnes. <br /> D. PERFORATED DR�IN PIPE:Should consist of a 4-inch diameter perfora�ed heavy-wall rolid pipe(SDR-35 PVC)or <br /> rigid corrugaled polyethylene pipe(ADS N-12)or equivalent. Drain pipes should be placed with 0.5 percenl minimum <br /> ;lopes and discharge lo Ihe storm waler colleclion syslem. <br /> Wall Drainage and Backfill <br /> � Undergraduate Education Cer�� � <br /> Everett Community College <br /> GEOENGINEERS� Figure3 <br /> .,�,,- <br /> .�,,. <br />