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VIII. Hydrology. A. Significant Effect. Potential of toxic spills degrading surface and groundwater quality. a.l Finding. The mitigation measures incorporated into the Project to reduce the potential for degrading of the water quality as a result of toxic spills will substantially lessen the effect. a.2 Fact. Condition 21 requires continued consultations with Developer, Fire Marshal, City Engineer and appropriate outside agencies to establish procedures for safe storage and handling of hazardous materials as part of the City's hazardous materials ordinance. a.3 Findinq. The No Project Alternative, which would avoid this impact, is infeasible and unnecessary because the mitigation measures which have been incorporated into the Project substantially lessen the effect. a.4 Fact. See Section XII (infeasibility of the No Project Alternative). B. Significant Effect. Buildout of the Tri-Valley area may result in flooding along the Arroyo de la Laguna during a hundred year storm. b.l Finding. The mitigation measures identified in the EIR such as the widening, deepening and/or concrete lining of Arroyo areas, downstream channelization, and use of "chain of lakes," are subject to the jurisdiction of other public agencies and can and should be enforced by such agencies. b.2 Fact. The mitigation measures to mitigate cumulative impact for Tri-Valley development are subject to the jurisdiction of the Alameda County Flood Control and Water Conservation District (ACFCWCD). b.3 Findinq. The No Project Alternative, which could partially mitigate the significant effect of flooding is infeasible. b.4 Fact. See Section XII (infeasibility of the No Project Alternative). IX. Biology. A. Significant Effect. Loss of prime agricultural soils to urbanization. - 23 -