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Existing Grade <br />Subdrain (if required) <br />Native Soil 3' min. <br />Lot 3 Existing Fiii <br />(excavate) <br />10' min. <br />COMPACTED BUTTRESS FILL <br />Compacted Fill <br />12" min. <br />18" min. <br />2" <br />Approved non-woven filter fabric <br />1/2x3/4 in. clean drain rock <br />or approved equivalent <br />4-inch perforated rigid drain pipe <br />t-- 2% min. <br />12" min. Native Soil <br />SUBDRAIN DETAIL <br />g~ NOTES <br />v 1. All pipe joints shall be glued. <br />2. All perforated pipe placed perforations down <br />n 3. 1 % fall (minimum) on all trenches and drain lines <br />n 4. Class 2 Permeable material is an acceptable alternative for drain rock and geotextile. <br />3' min. <br />Not to Scale <br />TYPICAL BUTTRESS AND SUBDRAIN FIGURE N0. <br />d Korbm~cher <br />E ~ ~ ' ~ G ° '~' ~ ~ ' ~ ° - Proposed Vineyard Pass Subdivision 9 <br />865 Clara Lane <br />`s PAOJEC7 NO. JB-569 DATE osios Pleasanton, California <br />w <br />