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City of Pleasanton–10x Genomics Project Environmental Checklist and <br />Initial Study/Mitigated Negative Declaration Environmental Evaluation <br /> <br /> <br />FirstCarbon Solutions 73 <br />Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480024/ISMND/wp/21480024 10x Genomics Project Full Screencheck ISMND.docx <br />Collapse <br />Neither the General Plan nor the Geotechnical Investigation indicate that the project site is on a <br />geologic unit that is at risk of collapse. Therefore, the proposed project would not be expected to <br />result in collapse. <br />d) Be located on expansive soil, as defined in Table 18-1-B of the Uniform Building Code (1994), <br />creating substantial direct or indirect risks to life or property? <br />Less than significant impact with mitigation incorporated. According to the Geotechnical <br />Investigation, a portion of the project site is blanketed by clayey soil with moderate expansion <br />potential. Expansive near-surface soils are subject to volume changes during seasonal fluctuations in <br />moisture content, which can cause cracking of foundations, floor slabs, and pavement sections. <br />Therefore, foundations and concrete flatwork will need to be designed and constructed to resist the <br />effects of the expansive soil. These potential impacts would be mitigated by implementation of MM <br />GEO-1, which would ensure incorporation of the recommendations from the Geotechnical <br />Investigation related to foundation design. With implementation of MM GEO-1, impacts would be <br />less than significant. <br />e) Have soils incapable of adequately supporting the use of septic tanks or alternative wastewater <br />disposal systems where sewers are not available for the disposal of wastewater? <br />No impact. The proposed project would be served by the municipal sanitary system. The proposed <br />project would not use septic tanks or alternative wastewater disposal systems. Therefore, no impact <br />would occur related to septic tanks or alternative wastewater disposal systems. <br />f) Directly or indirectly destroy a unique paleontological resource or site or unique geologic feature? <br />Less than significant impact with mitigation incorporated. According to the Paleontological Records <br />Search, the surface of the entire project site and most of the 0.5-mile radius of the project site consist of <br />undivided Holocene-Pleistocene deposits. Although such deposits generally have a low paleontological <br />potential, they have yielded vertebrate fossils in Alameda and Contra Costa counties.53 Therefore, <br />paleontological monitoring of excavations impacting previously undisturbed sediments would be <br />required during construction, as required by MM GEO-2. Implementation of MM GEO-2 would ensure <br />that any impacts related to paleontological resources would be less than significant. <br />Mitigation Measures <br />MM GEO-1 The project Applicant shall adhere to the recommendations set forth in the 2020 <br />Geotechnical Investigation prepared by Langan Engineering and Environmental <br />Services, Inc., dated December 3, 2020, for earthwork, foundation design, floor <br />slabs, pavement and concrete flatwork design, and landscaping. Foundations and <br />concrete flatwork shall be designed and constructed to resist the effects of <br />expansive soil in accordance with the Geotechnical Investigation. <br /> <br />53 Finger, K.L., PhD. 2020. Paleontological Records Search: 10x Genomics Project (21480024), City of Pleasanton, Alameda County. <br />December 16.