5117 23RD AVE W 2016-01-01 MF Import

Gcotcchnical Engineering Report 5 I 17 23`� Avc W January 2, 2009 RMI �ile No. 50909 Paec d Scismic Hazard "I'hc Site Class is C as shown in Tablc 1613.5.2 of the 2006 International Building Code (IBC). CONCLUSIONS AND RECOMMENDATIONS General It is our opinion that the site is compatible, from a geotechnical engineering standpoint, with proposed developments planned on this lot, provided recommendations and precautions herein are followed. The underlying deposits into which they will be buil! typically have high strength and are considered stable �vith regard to deep-seated earth movemenL The native soils should provide adequate support. We rccommend that a replacement rctaining wall be a rcinforced concrete wall extending through any loose surficial soils or fill and be founded on the vcry dense umveathered till about 6 feet below the curreut ground Icvel. The contractor sclected will likely wish to remove thc existing soft fill and replace it with sand or gavel. He should ensure that he does not undemiine the deck. Erosion Control Measures The crosion hazard for the on-sitc soils is consiJered high but the exposed site area is very limited. The contractor may havc to crect a silt fence beyon� die new retaining wali unless the construction takes piace in a period of dry weather. Temporary and Permanent Slopes Temporary cut-slopc stability is a function of many factors, such as the type and consistency of soils, depth of the cut, surchargc loads adjacent to the excavation, Icngth of time a cut remains open, and ihe presence of surface or ground water. It is difficult under these variable conditions to estimate a stable, temporary, cubslope angle. Therefore, it should be the responsibiliry of the contractor to maintain safe slope configurations since the contractor is continuously at the job site, able to observe the nature and condition of dic cut slopes, and ablc to monitor the subsurface materials and ground water conditions cncountcred. RMI ASSOCIATES LLC S f I}�