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

Novack Properlp 510 Place Evereft, Wa. 4.2 Site Preaaration 99-11-10 The driveway prisms and areas to be graded or that will receive fill should be stripped of brush, dense root accumulations, and any undocumented fill or organics prior to placing any fill or surfacing material. Based on our subsurface explorations, we estimate that the stripping effort should be on the order of 0.33 to 0.5 feet over most of the site. The native subgrade soil that covers most of the site contains a large percentage of silt and will be highly susceptible to disturbance when damp or wet. It is preferable to perform the site work including stripping during the warm, dry summer months. However, stripping could take place during the spring months as long as proper erosions control measures are put into place prior to starting work. Areas excavated to design or subgrade elevations or areas which are to receive structural fill should be proof -rolled with a roller to a firm, non -yielding condition if they are near their optimum moisture level. We recommend that pre -rolling be accomplished such that the upper 6 inches of the exposed non -organic soil is compacted to a density of at least 95 percent of the laboratory maximum, using the modified Proctor metbod (ASTM D-1557) as the density standard. If the subgrade is more than 2 percent above the optimum moisture content, adequate compaction of the site soils may be difficult or impossible to achieve. 9 GES, Inc.