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rI YV~ <br />I N C O R V O R A I e 0 <br />B. Geologic Hazards Addressed by the GRAD. <br />The Laurel Creek Estates GHAD will address only the following geologic hazards: <br />• Slope instability <br />• Landslides <br />• Erosion <br />• Sedimentation <br />These terms are defined in Section II.C, below. <br />1. Slope Instability and Landslides. <br />The risk of landslides is not unique to Laurel Creek Estates, but is present throughout <br />--- hillside projects in the San Francisco Bay Area. Landslides are a common geologic <br />phenomenon and are part of the process of mass wasting. Weathered or fractured <br />-- bedrock and soil are transported downslope over geologic time as a result of <br />gravitational, hydrostatic and seismic forces. <br />The most significant element in the Plan of Control is the monitoring and control of <br />- potential slope instability in the Covered Area. Relatively shallow landslides or areas of <br />slope instability were initially mapped during the preliminary geologic studies for the <br />- - subdivision. During the mass grading, a number of landslide deposits were exposed and <br />identified by the geotechnical consultants. Most of these landslides were subsequently <br />- removed and replaced with engineered fill under the observation of the geotechnical <br />consultants. A series of subdrains, engineered keyways and benches were installed <br />during the landslide and slope repairs. In some instances, the bases of the landslides were <br />- 4291-W2 <br />July 17, 1997 <br />Revised October 9, 1997 <br />Revised October 22, 1997 5 <br />