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� <br /> ---3'—� CONCREfE WALL <br /> 4" SUBSTATION ROCK --� I <br /> 12" CSBC '—� _ ; I <br /> 12" MIN. WALL DRAINAGE MATERIAL <br /> IMPERVIOUS SOIL <br /> i <br /> i <br /> RETAINED SOIL i 2' MIN. <br /> i <br /> i DAMP PROOFING <br /> TEMPORARY i <br /> EXCAVATION SLOPE i SUBSTAlION ROCK <br /> i +� <br /> G EOTEXTI LE—�' 4 ;� ' � -- - -- ------------� 4�� M I N. <br /> SEPARATION � - - ---------------------------------=I <br /> FABRIC �\�- } <br /> 12" MIN. COVER OF <br /> DRAINAGE MATERIAL 4" DIAMETER <br /> (6" MIN. ON SIDES OF PIPE) PERFORATED <br /> DRAIN PIPE <br /> NOT TO SCALE <br /> 0 <br /> � <br /> � <br /> N <br /> � <br /> z Materials: <br /> a <br /> � <br /> o A.WALL DRAINAGE MATERIAL: May consist of washed 3/8"to No.8 pea gravel.Alternatively the wall drainage <br /> Q material may consist of"Gravel Backfill for Drains"per WSDOT Standard Specification 9-03.12(4), surrounded with a <br /> � non-woven geotextile such as Mirafi 140N (or approved equivalent). <br /> � <br /> � <br /> m B. RETAINED SOIL: Should consist of structural fill, either on-site soil or imported.The backfill should be compacted in <br /> 0 <br /> � loose lifts not exceeding 6 inches. Wall backfill supporting building floor slabs should consist of imported sand and gravel <br /> � per WSDOT Standard Specification 9-03.14 compacted to at least 95 percent ASTM D1557. Backfill not supporting <br /> �, building floor slabs, sidewalks, or pavement should be compacted to 90 to 92 percent of the maximum dry density, per <br /> m ASTM D1557. Backfill supporting sidewalks or pavement areas should be compacted to at least 95 percent in the upper <br /> � two feet. Only hand-operated equipment should be used for compaction within 5 feet of the walls and no heavy <br /> Q equipment should be allowed within 5 feet of the wall. <br /> � <br /> � <br /> g C. CAPILLARY BREAK:Should consist of at least 6 inches of clean crushed gravel with a maximum size of 1-1/2 inches <br /> o and negligible sand or fines. <br /> N <br /> � <br /> 3 <br /> � D. PERFORATED DRAIN PIPE: Should consist of a 4-inch diameter perforated heavy-wall solid pipe (SDR-35 PVC)or <br /> � rigid corrugated polyethylene pipe (ADS N-12) or equivalent. Drain pipes should discharge to the storm water collection <br /> o system. <br /> � <br /> 0 <br /> � Wall Drainage and Backfill <br /> a <br /> O <br /> � Beverly Park Substation <br /> W <br /> � Everett, Washington <br /> 0 <br /> � �7EOENGINEER� Figure 5 <br /> 0 <br /> � <br /> � <br />