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• -1rl • <br />achieved by providing a foundation similar to file dewatering <br />structure as described above. We are available to provide <br />supplemental recommendations upon reouest. <br />FLOOR SLABS <br />We understand the dewatering structure will have an enclosed <br />building with a concrete slab-on-grade. The natural on-site <br />soils, exclusive of topsoil, are suitable to support lightly to <br />moderately loaded slab-on-grade construction provided some slab <br />movement can be tolerated. The slab movement could be the result <br />of settlement or expansion oC the below slab soils due to <br />wetting. To reduce this potential we recommend removal of at <br />least 3 feet oC the natural soils below the slab and replacement <br />with structural fill material. The fill should be like that <br />recommended beicw spread footing: and would probably be placed <br />concurrently with the foundation structural fill. To reduce the <br />effects of some differential movement, the floor slabs should be <br />separated from bearing walls and columns with an expansion joint <br />w}rich allows unrestrained vertical movement. Floor slab control <br />joints should be provided to reduce damage due to shrinkage <br />cracking. We sugvest that control joints be provided on the <br />order of 15 Ceet on center. The requirements for floor slab <br />reinforcement should be established by the designer based on <br />experience and the intended slab use. <br />Fill placed below floor slabs should be a predominant granu- <br />lar soil compacted to at least 95~ of standard Proctor density at <br />a moisture content near optimum. A minimum 4-inch gravel base <br />Chen & Associates <br />