Saticoy & Wells Community Plan & Development ... - City Of Ventura

Saticoy & Wells Community Plan and Code EIRSection 4.6 Geological HazardsMitigation Measures. No mitigation is required.Significance After Mitigation. Implementation of State requirements and adherence to2005 General Plan policies in all new development would reduce impacts associated withground shaking and fault rupture to a less than significant level for future projects in theSaticoy & Wells Project Area.Impact GEO-2 Future seismic events could result in liquefaction of soils inportions of the Project Area. Development in certain areaswithin the Project Area could be subject to liquefactionhazards. However, compliance with 2005 General Planpolicies would reduce potential impacts to a Class III, lessthan significant, level.Liquefaction, a process in which soils liquefy during ground shaking, is of greatest concern inareas with high water tables. Areas along and adjacent to the Santa Clara River and BrownBarranca within the Project Area are subject to liquefaction hazards. The Brown Barrancaliquefaction area crosses through the Northwest Neighborhood and the East Neighborhoodwhere the proposed Parklands Specific Plan Area and Saticoy-Gateway Specific Plan Area arelocated. No potential future developments are proposed for the Santa Clara River liquefactionarea.The 2005 General Plan contains an action that would address the risks from liquefaction. Action7.7 requires a geotechnical analysis and mitigation prior to development of any site within anarea mapped as having high or moderate risk for liquefaction. Additionally, Community PlanAction 11.7.1 requires review of the integrity of barranca structures to evaluate hazards toadjoining development from failing or disintegrating barranca walls. Implementation of these2005 General Plan and Community Plan policies as appropriate on Project Area developmentwould reduce liquefaction impacts to a less than significant level.Mitigation Measures. No Mitigation is required.Significance After Mitigation. Impacts would be less than significant withoutmitigation.Impact GEO-3 Expansive soil conditions could result in foundation andbuilding distress problems and cracking of concrete slabs.However, buildings would conform to CBC requirementsalong with 2005 General Plan policies that address expansivesoils would reduce potential impacts to Class III, less thansignificant.Expansive soil could lead to subsidence or settlement may result in loss of strength infoundation materials, such that structures built upon them gradually settle or break up.Expansive soils may contribute to downslope creep, landslides, and erosion. The seasonalexpansion and contraction of soils may cause foundations, walls, and ceilings to crack andvarious structural portions of building to warp and distort. Expansive soils are generally clayey4.6-10City of Ventura