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floor slabs, and site preparation and grading should be incorporated into <br /> the fina'I design of the project. <br /> Impact 2 - Potential Soil Instabilities <br /> The proposed project could be affected by the expansive soils or - <br /> site. The surface clay soils encountered to a depth of five feet in t <br /> test boring are expansive. Soils having high shrink-swell potential c <br /> damage structures having improperly prepared sites and foundations. <br /> Mitigation Measures. The following measures, suggested in Klei - <br /> felder's Task I report, should be incorporated into the design of t <br /> project to minimize impacts associated with expansive soils: <br /> • lightly loaded planned structures should be constructed <br /> foundations that extend below the depth of maximum moisturl�e <br /> fluctuation (minimum of 18 inches) . The preferred means is to <br /> underlay floor slabs with 12 inches of nonexpansive engineered <br /> fill over 12 inches of moist conditioned soils. <br /> • For heavier structures, foundations should extend through the <br /> expansive clay soils and bear on the underlying more dense <br /> soils. <br /> 3-49 <br /> 101-44.R3 4/10/89 <br />