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.Merila and Associates <br />STS Project 93492 <br />December 19, 1984 <br />-12- <br />The foundation for this retaining wall,. if based on naturally -occurring <br />soils meeting the criteria stated previously, or on structural fill, <br />can be designed for a maximum net allowable soil bearing pressure of <br />2,000-pounds per square foot. If free -draining granular backfill is <br />used against the wall, an "active" earth -pressure coefficient of 0.3 <br />may be used. This corresponds to an equivalent fluid pressure of <br />40-pounds per cubic foot per vertical foot of soil acting against the <br />wall, for a backfill with a damp unit weight of 130-pounds per cubic <br />foot. In addition to the loads applied by the weight of fill behind <br />the wall, traffic and parking loads must also be considered during the <br />design of this retaining structure. <br />Slab -on -Grade Floor Design <br />All topsoil, fill and buried organic soil should be stripped from the <br />floor slab area. Fill which is required under floor slabs should be <br />s placed and compacted as previously recommended. A minimum of 4 inches <br />of clean granular material should be placed immediately beneath the <br />floor slabs to provide for ease in fine grading. The floor slab should <br />be isolated from foundation walls in order to provide for the possi- <br />bility of minor differential movement between the two. <br />Pavement Design <br />The pavements adjacent to the building and between the structure and <br />retaining wall on the north side of the site will be based on <br />h� structural fill to raise the grade to the proposed road elevation. It <br />0- <br />