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