5114 33RD AVE W 2018-01-02 MF Import

Novack Property 510 Place Evereft, Wa. 99-11-10 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 (pcf) 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 pcf. 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 5 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 pressure as stated previously in this report. 4.8 Run-off, Drainase and Erosion Control Considerations Due to the dense, generally impermeable nature of the underlying till across the site, we expect that surface run-off will be high. Adequate erosion/siltation control measures should be installed during construction activities. These control measures could include any applicable combination of the following methods; siltation fences, controlled drainage through the construction area, run-off filtration through straw bales and limiting clearing and disturbance of surficial soil outside of the immediate construction area. 18 GES, Inc.