7725 EVERGREEN WAY BASE FILE 2016-01-01 MF Import

� e fine-grained fill soils are not recommended for use as structural fill. All on-site soils exhibit sufficient guantities of fine-grained materials to render them moisture sensitive and to make compaction and grading difficult if the moisture content increases above i:he optimum moisture content. The moisture content can be reduced by aeration in dry weather or by using lime or cement additives for stabilization. Ideally, structural fill to be placed in wet weather should consist of a granular material with a maximum particle size of three inches and no more than 5 percent by weight passing the No. 200 sieve size. During dry weather, any compactible non-organic soil can be used as structural fill. Structural fi11 under floor slabs and footings should be placed in horizontal lifts and cottQacted to a minimum 95 percent of the maximum dry density determined by ASTM Test Designation D-1557-7E3 (Modified Proctor). 'Ihe fill materials should be �laced at or slightly below the optimum moisture content. Fill under pavements and walks should also be placed in horizontal lifts and compacted to 90 percent of the maximum dry density except for the top twelve (12) inches which should be compacted to 95 percent of maximum density. Foundations The proposed structures may be supported on conventional spread footings bearing on cortQacted fill or dense in-place till. It is recommended that existing site fill soils be overexcavated a minimum depth of two feet below footing, or to the lense till, and replaced with strur_tural fill. Fil; placed under footings chuuld extend outwards from the edge of the feotings a distance equal to one-half the depth of fill. Exterior footings should be bottomed at a minimum depth o£ twelve (12) inches below t:1e lowest adjacent outside finish grade. Interior :�otings may be at a depth of twelve (12) inches below the top of the slab. Continuous and �