3_Exhibit C_ADDENDUM ONLY - Laserfiche WebLink

City of Pleasanton—Stoneridge Mall Residential Project Section 15183 Checklist/15164 Addendum CEQA Checklist FirstCarbon Solutions 117 Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480017/Consistency Checklist/21480017 Stoneridge Mall Residential Project Checklist Addendum_Updated.docx soil or groundwater. Table 4.G-1 in the Prior EIR identifies properties in the vicinity of the residential sites that are on the Cortese List. Site 3, which contains the project site, is not in the vicinity of any of the listed sites. The Prior EIR found that all sites listed under the Housing Element were fully remediated, with the exception of two sites (Sites 11 and 14). Potential future projects on these two sites could cause ground disturbance that may cause the accidental release of hazardous materials. However, the proposed project would occur at a site that is not listed on the Cortese List or nearby a site that is on the Cortese List. Therefore, it was determined that development at the project site would not create a risk of accidental release of hazardous materials into the environment. In addition to the above-mentioned risk, the Prior EIR also identified that excavation involved in construction and maintenance of development facilitated by the Housing Element could lead to the rupture of a PG&E or other pipelines, especially along pipelines running alongside I-580, along Santa Rita Road to First Street, and along the Sunol Boulevard – First Street – Stanley Boulevard roadways. The Prior EIR determined that to mitigate the risk of rupture of pipelines, developers and their contractors would be required to coordinate with the City’s Operation Services Department and utility owners through notification of the Underground Service Alert system to precisely locate any subsurface utilities prior to construction. The Prior EIR concluded that impacts would thus be less than significant in relation to pipeline rupture. Therefore, the Prior EIR found that, with the exception of the two contaminated sites mentioned above that are not part of the proposed project, impacts associated with hazardous materials upset or accidental release would be less than significant. Analysis of Proposed Project As mentioned above, the Prior EIR determined that the project site is not listed on the Cortese List, nor is it nearby a site that is on the Cortese List. Furthermore, a site-specific Phase I ESA was prepared for the proposed project. A recognized environmental condition (REC) is the presence or likely presence of any hazardous substance in, on, or at a property. The Phase I ESA, included as Appendix F, involved a site reconnaissance, which revealed no evidence of RECs.54 A de minimis condition is a condition related to a release that generally does not present a threat to human health or the environment that generally would be the subject of an enforcement action. The Phase I ESA identified that the project site’s historical agricultural use could have included the use of metallic and chlorinated pesticides and herbicides which could have left residual concentrations of these compounds in the soils, even decades after discontinuing their use. However, grading and construction efforts for the Stoneridge Mall would have substantially disturbed the existing soils, resulting in mixing of the soil and reduction of residual pesticide content that may have existed. Therefore, this is considered a de minimis condition and no mitigation is required.55 The project site is adjacent to I-580; however, as noted on the PG&E natural gas transmission pipeline map,56 the I-580 corridor pipeline is located in the project vicinity to the north along Dublin 54 Apex. 2022. Phase I Environmental Site Assessment. January 12. 55 Ibid. 56 Pacific Gas and Electric Company (PG&E). Natural Gas Transmission Pipeline Map Website: https://www.pge.com/en_US/safety/how-the-system-works/natural-gas-system-overview/gas-transmission-pipeline/gas- transmission-pipelines.page. Accessed December 1, 2022.