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Page 15 FE 382-063-00 <br /> thus, the slabs should be, isolated from the foundation system. <br /> This potential settlement will probably require maintenance• <br /> during the life of the: structure.. <br /> Drilled piers used for the proposed structures should be <br /> straight drilled shafts and should have a minimum shaft diameter ; <br /> of 3 feet. We recommend that the pier system be designed based; <br /> on. a straight drilled shaft extending to a minimum depth of 36 <br /> feet below finished grade . These end-bearing piers may be <br /> designed based on a combined dead-plus-live Load of 15 ,000 psf at <br /> a minimum depth of 36 f eet. T.hIs bearing value may be increased <br /> by one- third for short duration• wind or seismic loads . However, <br /> design: of pier systems .should be checked for lateral loading and <br /> qW <br /> .aacopayin.g deformation prior to finalizing the foundation <br /> systems of each structure. Total and differential settlement is <br /> not expected to exceed the tolerable limits of the structure.If <br /> the interior slabs are structurally supported , it will not be <br /> necessary to remove and replace the near-surface soils . However, <br /> we suggest that a system for venting potential generation o.f <br /> gases-.-or. a gas barrier be installed for each structured <br /> Slabs--on-Grade: Should slabs-on-grade be used at this site, <br /> we recommend removing and replacing the near-surface material <br /> from below the building sites to a depth of approximately 6 to 8 <br /> feet . The objective is to locate and ensure removal of the lens <br /> of soft organic material encountered in several of the test pits . <br /> Ilse Founda6on Ertaineers, Inc. <br />