1700 ENGLAND AVE 2016-01-01 MF Import

Z�raug Properll' 9J-12-l11 Ererett, IVnshingtow 4.6 Earth Pressures Behind Walls . All backfill placed behind walls or around foundations should be placed as per our recommendacions in the sections on Structural Fill, Drainage Considerations, Foundation Placement and Design Recommendations and as described in this section of the report. The following recommended earth pressures are presented as equivalent fluid pressures and are based on the assumption of a uniform, level, granular bac�ll without buildup of hydrostatic presswe behind the �valls. To minimize earth pressures and prevent the buildup of hydrostatic pressures, wall backfill should consist only of free draining granular material. If the backfilled walls are structurally restrained from lateral movement at the top, we recommend that the walls be designed for an equivalent weight of 50 pounds per cubic foot (pc fl to represent at rest pressure. If the tops of the walls are free to move laterally by an amount equal to at least 0.1 percent of the wall height, they may be designed for active conditions using an equivalent fluid pressure of 35 pc£ Surcharges due to sloping ground, adjacent footings, vehicles, construction equipment, etc., must be added to these values. Only light hand-held vibratory equipment should be used to compact soil within � feet of all walls and foundations. For modeling under seismic conditions, we recommend that a dynamic rectangular pressure increment be added to the static equivalent fluid pressurc in tl:e fonn of 12H in psf. I S GES, /��c.