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City of Pleasanton—Additional Housing Sites Rezonings Project <br />Addendum CEQA Guidelines Section 15164 Addendum <br /> <br /> <br />80 <br />e) Wastewater Disposal Systems <br />Would the project: Have soils incapable of supporting the use of septic tanks or other <br />alternative wastewater disposal systems where sewers are not <br />available? <br />Summary of Prior FEIR <br />As discussed in the Prior FEIR, the General Plan allows limited rural and low- <br />density residential development in areas where sewer may not be feasible, <br />creating the potential need for on-site sewage treatment systems. Because <br />soils in these areas often have constraints such as shallow bedrock, restricted <br />permeability, steep slopes, or high groundwater, they may not reliably <br />support effective wastewater treatment, increasing the risk of groundwater <br />contamination or surface-water degradation if septic systems fail or operate <br />improperly. Although the City requires local approval of private septic <br />systems, existing regulations do not include detailed siting standards, and <br />several areas identified for potential septic use have limited capacity to <br />safely accommodate them. According to the Prior FEIR, implementation of <br />General Plan Program 3.6, which prohibits septic systems in unsuitable <br />locations, along with applicable State and local regulatory oversight, would <br />reduce these risks and ensure that impacts related to septic system suitability <br />remain less than significant. <br />Proposed Project Analysis and Conclusion <br />The proposed sites are infill sites in developed areas and are currently served <br />by public wastewater infrastructure. As such, future proposed development <br />on the proposed sites would not include septic tanks and would be <br />expected to connect to the existing sewer system. Therefore, there would be <br />no impacts related to septic systems, and the proposed project would not <br />result in a new or more severe adverse impact that was not previously <br />identified and disclosed in the Prior FEIR. No further analysis is required. <br />f) Destruction of Paleontological Resource or Unique Geologic Feature <br />Would the project: Directly or indirectly destroy a unique paleontological resource or <br />site or unique geologic feature? <br />Summary of Prior FEIR <br />Paleontological resources or fossils are the remains of prehistoric plant and <br />animal life. Although the Prior FEIR did not specifically note known <br />paleontological resources within the City boundaries, the hills in the southern <br />and western portions of the City are noted as having a relatively high <br />sensitivity for containing prehistoric sites. Occurrences of fossil resources are