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Geotechnical Engineering Report- Revised lierracon <br /> Proposed CFT Retail Everett,Washington <br /> February 1, 2018 Terracon Project No. 81185002 <br /> TIGHTLINE ROOF DRAIN <br /> (Do not connect to footing drain)— <br /> SLAB <br /> STRUCTURAL BACKFILL <br /> 0 <br /> MIRAF1140N ao <br /> FILTER FABRIC <br /> 2 <br /> LL <br /> WASHED ROCK,MIN <br /> 6"ENVELOPE <br /> 4°PERFORATED SMOOTH PVC OR <br /> CORRUGATED PLASTIC PIPE <br /> (Invert elevation±8 inches from bottom of footing) <br /> 4.3.3 Construction Considerations <br /> Even after the footing subgrades are overexcavated and replaced with structural fill as <br /> recommended above, localized zones of unsuitable soil might be encountered in footing <br /> excavations. In this case, the excavations should be extended deeper to suitable soil. <br /> Overexcavation below footings should extend laterally beyond all edges of the footings at least 8 <br /> inches per foot of overexcavation depth below footing base elevation. The overexcavation should <br /> then be backfilled up to the footing base elevation with granular structural fill placed in lifts of 8 <br /> inches or less in loose thickness and compacted to at least 95 percent of the material's maximum <br /> modified Proctor dry density (ASTM D-1557). The overexcavation and backfill procedure is <br /> described in the figure below. <br /> • <br /> Sty:, <br /> Overexcavation r Backfill <br /> NOTE: Excavation shown vertical for convenience; excavations should be sloped as necessary for safety. <br /> Responsive Resourceful Reliable 11 <br />