Laserfiche WebLink
Section 4.0— Environmental Setting and Discussion oflmpacts <br />differential settlement at the site is also low. As discussed below, however, there is the potential for <br />non -liquefaction induced differential settlement to occur at the project site. <br />Lateral SvreadinR <br />Lateral spreading is a type of ground failure related to liquefaction. It consists of the lateral <br />movement of saturated soil deposits towards an open face. Redwood Shores Lagoon is located along <br />the western boundary of the project site. The project site is flat, and the liquefaction potential at the <br />site is low. For these reasons, the potential for lateral spreading to occur at the project site is low. <br />4.6.1.4 Differential Settlement <br />The project site is underlain by approximately 40 feet of saturated and soft bay mud sediments that <br />continue to settle under the weight of the existing fill and structures on the site. The weight from the <br />placement of additional fill and/or structures on the project site would result in increased settlement. <br />If fill and/or structures are not sufficiently distributed across the site, differential settlement could <br />occur, <br />4.6.1.5 Landslides <br />The project site and surrounding area are flat and, therefore, the potential for landslides to affect the <br />site is very low. <br />4.6.2 Environmental Checklist <br />GEOLOGY AND SOILS <br />Would the project: <br />1) Expose people or structures to <br />potential substantial adverse effects, <br />including the risk of loss, injury, or <br />death involving: <br />a) Rupture of a known earthquake <br />fault, as described on the most <br />recent Alquist-Priolo Earthquake <br />Fault Zoning Map issued by the <br />State Geologist for the area or <br />based on other substantial <br />evidence of a known fault? <br />(Refer to Division of Mines and <br />Geology Special Publication 42.) <br />b) Strong seismic ground shaking? <br />City of Redwood City <br />Sandpiper Elementary School Facilities Expansion <br />Less Than <br />Potentially Significant Less Than <br />Beneficial Information <br />Significant With Significant No Impact <br />Impact Mitigation Impact Impact Source(s) <br />Incorporated <br />❑ ❑ ❑ ® ❑ 1,8,9 <br />❑ ❑ ❑ ® ❑ 1,8,9 <br />41 initial Study/Mitigated Negative Declaration <br />November 2016 <br />