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- 41 - <br />(5) A representative of the soil engineer should observe the <br />materials exposed in all foundation excavations prior to concrete <br />placement. If fill material is present at footing elevation, <br />density tests should be conducted in the fill and the entire fill <br />area should be proofrolled with a heavily loaded pneumatic tired <br />vehicle. If density tests are low or pumping or deformation is <br />noted beneath the passes of the pneumatic tired vehicle, the fill <br />should be removed and replaced with properly compacted material. <br />FLOOR SLABS <br />The natural soils on the site are suitable for slab - on - grade <br />construction. We suggest the following measures be taken to reduce <br />the consequences of floor slab movement should the underslab soils <br />increase in moisture content: <br />(1) Floor slabs should be separated from all bearing walls and <br />columns with a positive expansio joint. <br />(2) Interior partitions resting on the floor slabs should be provided <br />with a slip joint so that in the event the slabs move, this <br />movement will not be transmitted to the upper structure. <br />(3) Floor slabs should be provided with control joints to minimize <br />damage due to shrinkage cracking and should be adequately <br />reinforced. <br />-4) A 4-inch gravel layer should be placed beneath floor slabs. <br />The above precautions will not prevent the movement of floor <br />►s in the event the underlying soils become wetted; however, they <br />�ll reduce the damage if movement occurs. <br />