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:otentially See FEIR, Section 4 . 6 . N-3 . Significant Impact : Settlement [ Impact 4 . 6-31 Settlement may occur if loads (fill and/or structures) are placed over the low-density clays along Old River . Finding : Changes or alterations have been required in, or incorporated into, the Project which avoid or substantially lessen the significant environmental effect as identified in the FEIR to a non-significant level . These mitigation measures are listed below. Statement of Fact : The impact will be mitigated by the following : • Areas underlain by low-density clays must be left as open space, or alternatively, building foundations must be designed to minimize potential settlement . :otentially See FEIR, Section 4 . 6 . N-4 . Significant Impact • Levee Failure [Impact 4 . 6-4] Levee failure along Old River and the Delta-Mendota Canal could be caused by moderate to strong groundshaking during an earthquake . Finding : Changes or alterations have been required in, or incorporated into, the Project which avoid or substantially lessen the significant environmental effect as identified in the FEIR to a non-significant level . These mitigation measures are listed below. Statement of Fact : The impact will be mitigated by the following : • Levees must be upgraded to meet engineering standards to ensure structural integrity under the anticipated maximum ground acceleration of 0 . 5g . A feasibility study to determine the cost of levee reconstruction and to examine alternatives , such as setting aside open space in the levee failure flood zone, must be completed prior to development of the Specific Plan(s) for the area potentially affected by such potential failures . • See FEIR, Section 4 . 6 . C2-33 0189r/0202r