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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 basedi <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 feet. This 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 /> accompanying deformation prior to f inalizing 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 of <br /> gases--or. a gas barrier be installed for each structure. <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 /> r _ <br /> Ile Foundation Engineers, Inc. <br />