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SMNET *V, <br /> STL Project No. 0010771 <br /> -- R�strng L?bs Page 7 <br /> i <br /> A representative of our firm should be present during all site clearing and grading operations to test and <br /> observe earthwork construction. This testing and observation is an integral part of our service as <br /> i acceptance of earthwork construction is dependent upon compaction of the material and the stability of <br /> the material. The Soils Engineer may reject any material that does not meet compaction and stability <br /> ` requirements. Further recommendations of this report are predicated upon the assumption that <br /> earthwork construction will conform to recommendations set forth in this section and the Engineered <br /> Fill section. <br /> i <br /> Engineered Fill <br /> The organic-free on-site native soils encountered with the grading zone are predominantly silty sands <br /> and sandy silts. These soils will be suitable for reuse as non-expansive Engineered Fill. <br /> The preferred materials specified for Engineered Fill are suitable for most applications with the <br /> exception of exposure to erosion. Project site winterization and protection of exposed soils during the <br /> construction phase should be the sole responsibility of the Contractor, since he has complete control of <br /> the project site at that time. <br /> If utilized, imported fill material should be predominantly non-expansive granular material with a <br /> ` plasticity index less than 10 and a UBC Expansion Index less than 15. Imported fill should be free <br /> from rocks and lumps greater than 4 inches in diameter. All import fill material should be submitted <br /> for approval to the Soils Engineer at least 48 hours prior to delivery to the site. <br /> i <br /> Fill soils should be placed in lifts approximately 6 inches thick, moisture-conditioned as necessary and <br /> compacted to achieve at least 90% of the maximum dry density as determined by ASTM D1557. <br /> i <br /> Additional lifts should not be placed if the previous lift did not meet the required dry density or if soil <br /> conditions are not stable. <br /> Drainage and Landscaping <br /> The ground surface should slope away from building pad and pavement areas toward appropriate drop <br /> inlets or other surface drainage devices. It is recommended that adjacent exterior grades be sloped a <br /> minimum of 2% for a minimum distance of 5 feet away from structures. Subgrade soils in pavement <br /> areas should be sloped a minimum of 1% and drainage gradients maintained to carry all surface water <br /> to collection facilities and off site. These grades should be maintained for the life of the project. <br /> ` Slots or weep holes should be placed in drop inlets or other surface drainage devices in pavement areas <br /> to allow free drainage of adjoining base course materials. Cutoff walls should be installed at pavement <br /> _ edges adjacent to vehicular traffic areas; these walls should extend to a minimum depth of 12 inches <br /> below pavement subgrades to limit the amount of seepage water that can infiltrate the pavements. <br /> Where cutoff walls are undesirable subgrade drains can be constructed to transport excess water away <br /> from planters to drainage interceptors. If cutoff walls can be successfully used at the site, construction <br /> of subgrade drains is considered unnecessary. <br /> i <br /> 1417 No.Market Blvd.,Suite 1 . Sacramento,CA 95834 . (916)568-5858 . Fax: (916)568-5813 <br />