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IHN Lehtinen �► 1wN ,1'5('VDate <br />of <br />Engineering r <br />3216 `'retmore Ave. I Page No. of <br />Evere.t, WA 98201 <br />(425)252-2373 _C6 D/ 7 ' <br />I <br />6 <br />M i , <br />r ; � <br />r i <br />4 <br />Zt <br />Zy2 <br />i <br />Z2 <br />LEGEND <br />Crushed rock filter material ranging between 4 and 11/2 Inches in size and free <br />.• of organics, with less than 5 percent fines (silt and day size particles passing <br />the No. 200 mesh sieve). <br />Compacted structural fill consisting of free -draining, organic -free material with a <br />maximum size of 4 inches. Should contain no more than 5 percent fines <br />(described above), compacted to at least 95 percent of ASTM D-1557-78 <br />maximum density. <br />_ _ Tenser SS-1 geogrid, Mirafi, or equivalent reinforcement approved by <br />l <br />geotechnical engineer. 4 p-r �Ql 'b rV2- <` g <br />OPerforated or slotted drain pipe with 4 Inch minimum diameter bedded on and <br />surrounded by crushed rock filter material, described above. <br />® Designates size of rock required, i.e. 4 man. <br />NOTES <br />• All fill should be placed in thin lifts not exceeding 10 inches in loose thickness. Each <br />layer should oe compacted to no less than 95 percent of maximium dry density, as <br />determined by ASTM D-1557-78 (Modified Proctor). <br />• With exception of upper layer, geofabric reinforcement should be wrapped around <br />exposed fill face and lapped back beneath overlying fill layer a distance of at least <br />2 feet. <br />Thickness of crushed filter rock layer, B, should be no less than 18 inches. <br />Depth of burial of basal sayer of rock, D, should be no less than 18 inches. <br />Length of reinforcing geofabric, L,,, shall be 1 feet. <br />Geofabric reinforcement layer spacing Z, and Z„ shall be 2 and feet, <br />respectively. <br />Height of rockery, H, should not exceed I L, feet. <br />