6.6. SR 08-19-2002 - Laserfiche WebLink

Home Browse Search

AET #20-02044 - Page 11 of the Standard Proctor maximum dry density (ASTM:D698). Where the thickness of fill below foundations exceeds 10', the fill should be compacted to a minimum of 98%. We recommend that fill be placed in lift thicknesses appropriate for the type of equipment used and the conditions at the time of the actual earthwork. The thickness should be such that the entire lift attains the minimum specified compaction level. The fill should consist of a suitable inorganic soil. The soils described on the boring logs as coarse alluvium, the dryer parts of the fmc or mixed alluvium and the glacial till should be suitable for reuse within a compacted fill system. However, these soils must be placed at a proper water content in order to attain compaction. If the existing soils are too wet for use as compacted fill, these soils may require mechanical aeration to reduce water content prior to compaction. Such aeration can be time consuming and will require favorable weather conditions. Based on our observation of the samples retrieved and the results of the water content tests, it is our opinion that aeration of some of the site soils will be required to achieve proper compaction. In areas where new fill will be placed on sloping ground, we recommend benching the surface prior to placing the fill. Benching is recommended where slopes are steeper than 4 horizontal to 1 vertical (4:1 slope). Foundations The structure can be supported on conventional spread foundations placed on the compacted fill or the competent natural soils. We recommend perimeter foundations adjacent to heated building space be placed such that the bottom is a minimum of 42" below exterior grade. We recommend exterior foundations not bordering heated building space (such as canopy/pier foundations or garage foundations) be extended to a minimum of 60" below exterior grade.