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ENGEO <br /> INCORPORATED <br /> <br /> <br />5150.100.101 <br />May 2, 2008 Page 18 <br />4. Place approximately 4 inches of washed crushed rock bedding along the trench bottom. <br />Washed crushed rock should have 100 percent passing the ¾-inch sieve and less than <br />5 percent passing the No. 4 sieve. <br /> <br />5. Place a minimum 4-inch-diameter slotted or perforated pipe over the initial bedding layer. <br />Orient slots/perforations towards the bottom of the trench. Slope the pipe at least 1 percent <br />towards the collector system. <br /> <br />6. Fill the remaining trench with washed crushed rock to approximately ½ foot below finished <br />grade. <br /> <br />7. In structural areas, compact all crushed rock using 2 to 3 passes of a vibratory plate <br />compactor for each 12-inch loose lift. <br /> <br />8. Fold the filter fabric over the last lift of crushed rock and overlap at least 12 inches. <br /> <br />9. Cover the drainage system with ½ foot of native fill, compacted in accordance with Section <br />4.4. <br /> <br />10. Remove collected water down gradient by connecting the subdrain pipes to storm drains or <br />another suitable collector system. <br /> <br />7. FOUNDATION RECOMMENDATIONS <br /> <br />We developed structural improvement recommendations using data obtained from our field <br />exploration, laboratory test results, and engineering analysis. <br /> <br />7.1 CONVENTIONAL FOOTINGS WITH SLAB-ON-GRADE <br /> <br />The proposed restaurant can be supported on continuous or isolated spread footings bearing in <br />competent native soil or compacted fill. <br />