1700 ENGLAND AVE 2016-01-01 MF Import

9J-11-:0 Zx•nrrg R'operll' Everett, Wnsliington located within the lower reaches of the north end of the site. All of this fill should be removed and replaced with a clean, free draining granular fill that is benched into the slope. On-site excavated materials other than topsoil should meet the requirements for this fill. The native subgrade soil that covers most of the site contains a small percentage of silt and will be slightly susceptible to disturbance when damp or wet. For this reason, it would be preferable to perform the site work including stripping during the warm, dry summer months. Areas excavated to design or subgrade elevations or areas which are to receive structural fill should be proof-rolled with a roller to a ficm, non-yielding condition if they are near their optimum moisture level. VVe 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 method (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. If grading must be initiated within areas of the site where soils are more than about 2 l��ercent wetter than optimum, those areas to receive fill should be blanketed with a clean, coarse free draining crushed rock, quarry spalls or equivalent non-moisture sensitive material to provide a worl:ing surface for the subsequent structural f ll placement. The contractor should be made aware of tlie fact that the fine sandy 9 GES, /nc.