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structural gravel. Foundation elements bearing on 3 feet o f this structural gravel could be designed utilizing <br />a 2,500 p.s. f. maximum bearing capacity (dead load plus full live load). The structural fill shall be <br />compacted as outlined in Appendix A of this report, and the imported structural fill shall conform to the <br />following. <br />GRADATION (ASTM C 136) <br />(% Finer by Weight) <br />2" 100 <br />#4 30 - S0% <br />#200 15% Max. <br />Plasticity Index Non Plastic <br />If soft areas are encountered during the excavation, larger pit run gravels may be required to stabilize the <br />soft soil prior to placing foundations or the structural fill. <br />We estimate that properly engineered and constructed footings should experience total settlement on the <br />order of I inch. Differential settlement should be on the order of Y2 to 3/4 of the estimated total <br />settlement. All footings should be placed a minimum o f 30 inches below finished grade for frost protection. <br />The following requirements should be followed in the design of the foundation system: <br />I. All foundation pads should bear through fill and /or the lean /fat clays and bear on native silty sands, <br />or sandy gravels or 3 feet of structural fill. Foundation elements should not be placed on frozen <br />ground, topsoil, or inadequately compacted or unsuitable fill material. <br />5 <br />