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7.B. - Page 100 Redwood City Chapter 4.Environmental Impact Analysis proposed modifications would not create erosion hazards which would lead to offsite erosion. Therefore,new impacts would be less than significant. c. Be located on a geologic unit or soil that is unstable or that would become unstable as a result of the project and potentially result in an on-or offsite landslide,lateral spreading,subsidence, liquefaction,or collapse? Less-than-Significant New Impact with Mitigation Incorporated. Refer to Section 4.7.a-3 above for a description and impact discussion related to potential liquefaction impacts,and to Section 4.7.a-4 above for information related to potential landslide impacts.As discussed in Section 4.7.a-3, the project area is subject to liquefaction,and implementation of Mitigation Measure 4.8-2 (Mitigation Measure 4.8-2 from the 2007 FEIR) would reduce potential new impacts to a less-than- significant level. d. Be located on expansive soil,as defined in Table 18-1-B of the Uniform Building Code(1994), creating substantial risks to life or property? Less-than-Significant New Impact with Mitigation Incorporated. Expansive soils are fine- grained soils (generally high plasticity clays)that can undergo a significant increase in volume with an increase in water content and a significant decrease in volume with a decrease in water content. Seasonal changes in the water content of expansive soils can result in expansion of the soil and severe distress to structures constructed upon the soil.Volume changes associated with changes in the moisture content of near-surface expansive soils can cause uplift or heave of the ground when the soils become wet or,less commonly,cause settlement when they dry out. As described in the Geotechnical Investigation prepared for the fueling center(Kleinfelder,Inc. 2006),the project site is located on highly expansive soils. If unmitigated,the expansion and contraction of these soils could cause moderate damage to structures and pavements,however such damage would not result in a risk of injury or loss of life.The 2006 Kleinfelder report includes recommendations such as an extended foundation for the fueling center canopy and that the fueling islands are supported on a mat slab. Mitigation Measure 4.8-3 in the 2007 FEIR(page 4.8-5) required the project to comply with the recommendations provided in the Geotechnical Investigation and Soil Investigation letter(Appendix G to the 2007 FEIR)to prevent undue geologic hazards.This measure has been modified as Mitigation Measure 4.8-3,which also requires the proposed modifications to comply with recommendations found in the 2006 Kleinfelder, Inc. Geotechnical Investigation.Implementation of Mitigation Measure 4.8-3 would be consistent with Programs PS-23 and PS-24 in the General Plan,and would reduce potential new impacts related to expansive soils to a less-than-significant level. Mitigation Measure 4.8-3 (modified from 2007FEIR Mitigation Measure 4.8-3):The project shall comply with the recommendations provided in the Geotechnical Investigation and Soil Investigation letter(Appendix G [to the 2007 FEIR]) and the relevant recommendations provided in the Geotechnical Investigation Gasoline Facility(Revised Location) prepared by Kleinfelder,Inc.in October 2006 and Addendum No. 1 to the Geotechnical Investigation prepared in May 2012 (Appendix D) to prevent undue geologic hazards on the site. e. Have soils incapable of adequately supporting the use of septic tanks or alternative wastewater disposal systems in areas where sewers are not available for the disposal of wastewater? No New Impact.The proposed modifications would not include the use of septic tanks or alternative wastewater disposal systems.Therefore,no new impact would occur. Addendum No.2 to the Environmental Impact Report for 4-55 September 2012 the Redwood City Costco Wholesale Project ICF 00154.12