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July 3,2017 <br /> Single-Family Residence <br /> L&A Job No. 17-079 <br /> Page 10 <br /> observed and verified by a geotechnical engineer during excavation. If there is <br /> insufficient space for open cut at the above recommended slopes, excavation shoring <br /> should be used. We will glad to provide excavation shoring recommendations if needed. <br /> Permanent fill embankments required supporting structural or traffic load should be <br /> constructed with compacted structural fill placed over undisturbed, proof-rolled, firm, <br /> native, advance outwash soil after the surficial unsuitable soils are completely stripped. <br /> The slope of permanent fill embankments should be no steeper than 2-1/4H:1V. Upon <br /> completion, the sloping face of permanent f embankments should be thoroughly <br /> compacted to a non-yielding state with a hoe-pack. <br /> The above recommended cut and fill slopes are under the assumption that groundwater <br /> seepage would not be encountered during construction. If groundwater is encountered, <br /> grading work should be immediately halted and slope stability re-evaluated The slopes <br /> may have to be flattened and other measures taken to stabilize slopes. Stoimwater should <br /> not be allowed to flow uncontrolled over cut and fill slopes. Permanent cut slopes or fill <br /> embankments should be seeded and vegetated as soon as possible for erosion protection <br /> and long-term stability, and should be covered with clear plastic sheets, as required, to <br /> protect them from erosion until the vegetation is fully established. <br /> SLOPE STABILIZATION <br /> The steep slope flanking the east side of the project site is composed of dense advance <br /> outwash sand soil. The advance outwash deposits are of high shear strength and are <br /> highly resistance against slope failures. Therefore, the steep slope should be quite stable <br /> LIU & ASSOCIATES, INC. <br />