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<br />' -24- <br />' <br /> mitigated by allowing for vertical rtnvement of the slab <br />' without affecting the upper structure or placement of the <br /> slab on a compacted granular fill pad. The fill pad should <br />' consist of a minimum 3 foot depth of non-expansive material <br /> compacted to at least 958 of standard Proctor density. <br />1 h <br />id <br />d i <br />d <br />i <br />4 i <br />l <br />l <br />ld b <br /> mme <br />- <br />4. A m <br />nimum <br />ayer of grave <br />s <br />ou <br />e prov <br />e <br />nch <br />' iately beneath floor slabs. Greater thickness may be <br /> required beneath floors subjected to heavier loadings. <br /> 5. Slabs should be provided with frequent control joints. <br /> 6. During construction, the subgrade should not be subjected to <br /> inundation or prolonged drying period. Following construc- <br />t tion, perimeter barJcfill should be well compacted and sloped <br /> away from the structures to redure moisture infiltration into <br />' bearing soils and potential differential movement. <br /> It has been our experience in areas such as this with a stiff <br />' clay subgrade that perd~ed water can develop at times of seasonal high <br /> runoff. Therefore, any below grade floor level should be protected by <br /> an underdrain s <br />und <br />t <br />m <br />A <br />rd <br />i <br />t <br />h <br />ld <br />id <br />d <br />l <br />b <br /> ys <br />. <br />n <br />e <br />ra <br />n sys <br />em s <br />ou <br />so <br />e prov <br />e <br />a <br />e <br /> where floor level is placed within 2 feet of high ground water level <br /> at the lower portion of the site. The underdrain system should <br /> consist of a perforated pipe installed in a gravel-filled trench at <br /> least 7 foot below lower floor level leading to suitable gravity <br />' outflow or to a sump. <br /> <br /> <br />~~ <br /> <br />