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LSA ASSOCIATES, INC. CEQA INITIAL STUDY /MITIGATED NEGATIVE DECLARATION <br /> MARCH 1011 FREDA STREET PIPE BRIDGES UPGRADE <br /> SAN LEANDRO, CALIFORNIA <br /> would prevent damage to the existing structures from existing seismic related hazards, including <br /> liquefaction and lateral spreading. Therefore, these impacts are considered less than significant. <br /> The project site has not been subjected to mining activities and the risk of subsidence or collapse <br /> is expected to be low. <br /> d) Be located on expansive soil, as defined in Table 18 -1 -B of the Uniform Building Code (1994), <br /> creating substantial risks to life or property? <br /> Less Than Significant Impact. Expansion and contraction of volume can occur when expansive <br /> soils undergo alternating cycles of wetting (swelling) and drying (shrinking). During these cycles, <br /> the volume of the soil changes markedly. Expansive soils are common throughout California and <br /> can cause damage to foundations and slabs unless properly treated during construction. The soils <br /> at the project site have a high clay content and thus a high potential to be expansive. The <br /> proposed project would replace two existing sewer pipes and rehabilitate two existing pipe <br /> bridges. Installation of the new sewer pipes would include two new concrete restraints known as <br /> deadmen. These concrete restraints would be embedded in the ground and thus be subjected to the <br /> shrink -swell cycle of the soils. However, no housing or other buildings are proposed, and the <br /> proposed project has been designed to minimize substantial risks to property related to expansive <br /> soils. Therefore, this impact is less than significant. <br /> e) Have soils incapable of adequately supporting the use of septic tanks or alternative waste water <br /> disposal systems where sewers are not available for the disposal of waste water? <br /> No Impact. The proposed project would not require the installation or use of septic tanks or <br /> alternative wastewater disposal systems. Therefore, there are no impacts related to soils incapable <br /> of supporting the use of septic tanks or alternative wastewater disposal systems. <br /> P: \EGI080 I\CEQA\Preda_FINAL_IS•MND.doc (03/28/11) 30 <br />