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-23- <br />fill is properly compacted. However, slabs placed on clay soils <br />encountered within the higher plateau area could heave and crack • <br />should the clay be subjected to ,mange in moisture content. This <br />potential would be greatest where the subgrade is inadvertently dried <br />or subsequently o~acted. Where slab-on~rade construction is <br />required we suggest the following details to reduce potential for <br />damage in the event of ~rovement: <br />1. On-site clays encountered in the higher plateau area are not <br />well suited for use as fill beneath slab-on-grade floors. <br />Additional required fill should consist of low to non- <br />expansive material oompacte3 to at least 958 of standard <br />Proctor density (AS'IId t~698) at a miisture content near <br />~~- <br />Prior to fill place~rent, the ground surface should be cleared • <br />of all vegetation, topsoil and any loose soil or uncnmpacted <br />fill. in the sower area along the river, the exposed <br />subgrade should be scarified 6 inches, moistened to near <br />optimum and coaiQacted. <br />2. All slabs should be :zparated from bearing members with a <br />positive expansion joint and adequately reinforced for the <br />proposed use. <br /> <br />3. Thickened slab sections or partition walls placed directly on <br />the slab can be used in the lower area along the river with a <br />relatively low risk of differential ~rovement. In the higher , <br />plateau area the risk of trovement will be muoh greater for <br />slabs placed above tr_^ natural clay soils. This risk can be • <br />