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Page 6 - #120-11872 <br />Discussion <br />The extreme western portion of the site is up to abut 13` above the proposed <br />first floor elevation while the center and eastern portion of the site is <br />considerably below floor elevation. As a result, extensive grading will <br />be required to prepare the site for construction. <br />With the exception of the controlled fill, it is our opinion that the existing <br />fill is not suitable for foundation support. In addition, extensive <br />depths of topsoil, fine alluvial deposits and soft glacial till were encoun- <br />tered in the eastern portion of the site. These soils are weak and moderately <br />compressible. In our opinion, these soils should not be utilized for foun- <br />dation or floor slab support. <br />It is our opinion that the most feasible foundation plan is to utilize an <br />excavate -refill grading plan and then utilize spread footing foundations <br />for support of the building. Prior to placing the controlled fill, the <br />fill, topsoil and soft cohesive soil should be removed from the entire build- <br />ing ar-a prior to placing a well -controlled fill to floor elevation. The <br />one exception is the controlled fill area where only the upper portion of <br />the fill should be removed. After the site has been prepared with controlled <br />fill, the building can be supported on spread footing foundations either <br />on the natural soil or compacted fill. <br />SOIL exr-kORation <br />