4003 NASSAU PL 2016-01-01 MF Import

� L �. � I� Geotechnical Engineering Report Kvemmo Single-Family Residence 4003 Nassau Place, Everctt September ] 7, 2002 NGA File No. 356102 Page 7 erosion. Measures taken may include diverting surfac� h atcr away from the suipped ereas• Silt fences or straw bales should be installed to prevent muddy water from leaving the site. Disturbed areas should be planted with vegetation as soon as practical• The vegetation should be maintained until established Temporary and Permaneot Slopes Temporary cut slope stability is a function of many factors, such as the type and consistency of soils, depth of the cut, surcharge loads adjacent to the excavation, Iength of time a cut rcmains open, end the presence of surface or ground water. It is exceedingly di�cult under these variable conditions to estimate a stable, iemporary, cut-slope geometry. Thereforc, it should be the responsibility of the contractor to maintein safe slope configurations, since the contractor is continuously at the job site, able to observe the namre and condition of the cut slopes, and a'�le to monitor the subsurface materials and ground water conditions encountered. Ttie following information is provided solely for the benefit of the owner and other design consultants and should not be consuued to imply thet Nelson Geotxhnical Associates, Inc. assumes responsibility for job site safety. ]ob site safety is the sole responsibility of the project contractor. For planning purposes, we recommend that temporary cuts in the fill encountered on site be no steeper than 2 Horizontal to 1 Vertical (2H:1 V). Cuu in the underlying native material should be no steeper than 1.SH:1V. Where ground water seepage and/or loose soils are encounterod, flatter inclinations might be necessary. We recommend that cut slopes be protected from erosion. Measures taken may include covering cut slopes with plastic sheeting and diverting surface runoff away fi'om the top of cut slopes. We do not recommend vertical slopes for cuts deeper than 4 fat, if worker access is necessary. We recommend that cut slope heighu and inclinations conform to WISHA/OSHA standards. Final slope inclinations for structural fill and stable, native soils should be no staper than 2 Horizontal to 1 Vertical (2H:1 V). Lightly compac�ed fills or common fills should be no steeper than 3H: 1V. Common fills are defined as fill material with or without some organics that are "trackrolled" into place. They would not meet the compaction specification of swctural fill. Final slopes should be planted �vith vegetation and covered with straw or jute netting. The vegetation should be maintained until it is established. NELSON GEOTECHNICAL ASSOCIATES, IN /i8'