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Footingdrains should be incorporated in the designof the building. <br /> rp g <br /> ' FLOOR SLABS <br /> A subgrade modulus of 200 pounds per cubic inch(pci)may be used for design of the slabs-on-grade at <br /> the site. Concrete slabs-on-grade should be supported on a 6-inch-thick capillary break layer. A vapor <br /> retarder should be used under moisture-sensitive floor areas. <br /> BELOW-GRADE WALLS <br /> Below-grade walls should be provided with a free-draining drainage layer and perforated drainpipes. <br /> For below-grade walls constructed either neat against the dense native soils, or backfilled with <br /> compacted structural fill,we recommend the following equivalent fluid weights: <br /> • Allowable passive—350 pcf <br /> • Active—35 pcf <br /> • At rest—55 pcf. <br /> j <br /> I <br /> I <br /> I <br /> I <br /> 1 <br /> File No.12547-001-00 Page ES-2 GEOENGINEER <br /> February 3.2006 <br />