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City of Pleasanton—Hidden Canyon Residences and Preserve Geology, Soils, and Seismicity Draft EIR 3.6-36 FirstCarbon Solutions https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480016/EIR/3 - Draft EIR/21480016 Sec03-06 Geology.docx Required Investigation, cumulative impacts would be less than significant. Additionally, as described above, the proposed project’s incremental contribution to the less than significant cumulative impact related to seismic-related hazards would be less than cumulatively considerable. Soil-related Hazards The Greek Orthodox Church Project is within the geographic scope for this cumulative analysis and would likely implement construction activities such as grading, trenching, and filling that could exacerbate soil erosion. If the Greek Orthodox Church Project disturbs at least one acre of land, the Greek Orthodox Church Project, similar to the proposed project, would be required to abide by Municipal Code Section 9.14 which conforms to C.6 Construction Site Control Requirements in the RWQCB NPDES permit (Order No. R2-2022-1108; NPDES Permit No. CAS612008) by submitting a NOI to the City, and would prepare an erosion/pollution control plan or SWPPP to obtain a Construction Stormwater General Permit. The erosion/pollution control plan or SWPPP would identify and implement site-suitable BMPs that would implement erosion and sediment control measures during construction activities. As previously mentioned, the Greek Orthodox Church Project is not delineated in a Landslide or Liquefaction Zone of Required Investigation by the CGS. Accordingly, cumulative impacts related to landslides or liquefaction would be less than significant. Furthermore, soil-related hazards such as lateral spreading, collapse, subsidence, and expansive soils are site specific, and both projects are in direct proximity to the City’s existing water lines, sewer lines, and stormwater drains and would not require the installation of septic tanks or other alternative wastewater disposal systems. Since both projects would be required to implement site-specific erosion control measures through BMPs, soil-related hazards are site-specific, and are in proximity to the City’s water lines. Therefore, cumulative impacts would be less than significant. Moreover, as discussed above, the proposed project’s incremental contribution to less than significant cumulative impacts would not be cumulatively considerable. Impacts related to soil hazards would be less than significant, and the proposed project ’s incremental contribution would be less than significant. Paleontological Resources Potential cumulative impacts to paleontological resources are limited to construction. As discussed above, the Greek Orthodox Church Project is the only cumulative project within an 0.5-mile radius from the project site and is considered in the geographic scope for this cumulative analysis. Because of being in relative proximity to each other, both the proposed project and the Greek Orthodox Church Project are likely situated on the same Miocene sedimentary rocks comprised of sandstone, siltstone, and siliceous shale. As previously mentioned, rock units with high paleontological potential consist of sedimentary rock units such as argillaceous and carbonate-rich paleosols and fine-grained marine sandstones. As such, ground-disturbing activities during the construction phase of each project have the potential to unintentionally uncover and disturb significant paleontological resources on-site. Because of the site-specific nature of potential impacts, the potential for cumulative impacts is limited. However, both the proposed project and the Greek Orthodox Church Project would be required to abide by the same applicable federal, State, and local rules and regulations governing the preservation, recovery, and curation of significant paleontological resources and would implement mitigation measures identified as necessary regarding the potential of uncovering such resources. In addition, the discovery of significant paleontological resources is site-specific and any unintentional discovery from construction activities would not directly