14 ATTACHMENT 6 - Appendix A - E

City of Pleasanton–Spotorno Ranch Reduced Development Project Environmental Checklist Initial Study/Consistency Checklist 162 FirstCarbon Solutions https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480021/Consistency Checklist/21480021 Spotorno Ranch Consistency Checklist ScreenCheck.docx Wastewater The 1998 HVSP FEIR determined that the single-family residential development permitted by the HVSP would generate wastewater totaling approximately 81,200 GPD based on a standard generation factor of 280 GPD.46 With installation of water conservation devices consistent with General Plan Water Programs VI-4.5 and 4.6, the amount of wastewater generated by residential development in the HVSP area would be reduced to 78,974 GPD.47 The 1998 HVSP FEIR determined that wastewater generated by the proposed project would not exceed the amount accounted for in the Pleasanton Sewer Master Plan. The existing collection systems would be adequate to handle these flows. Together with other development permitted by the Pleasanton General Plan, buildout of the project would add to existing flows, but would not exceed the capacity of sewer mains to which the HVSP area would be connected. Impacts were considered less than significant. The proposed project could have a significant impact if the project would not be served by a wastewater treatment plant with an adequate capacity or would require the construction of new or expanded facilities, or if the project creates wastewater that exceeds the wastewater treatment requirements of the San Francisco Bay RWQCB established by Order R2-2017-0017 NPDES Permit No. CA0037613, Waste Discharge Requirements and Master Reclamation Permit for the Diablo San Ramon Service District (DSRSD), Livermore-Amador Valley Wastewater Management Authority (LAVWMA ), and the East Bay Dischargers (EBDA). Wastewater from the project would be conveyed to the DSRSD Regional Wastewater Treatment Facility (RWTF) for treatment and then exported to the LAVWMA system where it would be conveyed to the EBDA before being released into the San Francisco Bay. Wastewater from the project would consist mostly of effluent typical of residential uses and as such would not substantially increase pollutant levels in the wastewater or exceed RWQCB standards. After certification of the 1998 HVSP FEIR, the RWTF completed an expansion project to bring the average dry weather wastewater flow design capacity from 11.5 MGD of wastewater treatment capacity to 17 MGD. The City of Pleasanton is currently entitled to half of this treatment capacity, or 8.5 MGD. The City’s average annual wastewater flow is approximately 6.0 MGD, leaving an additional 2.5 MGD of capacity, which is sufficient to serve Pleasanton’s planned buildout growth as anticipated in the General Plan.48 The maximum treatment plant ultimate design capacity is currently planned for 20.7 MGD average dry weather flow. Future expansion would allow Pleasanton dry weather flows to reach, but not to exceed, 10.3 MGD, if needed.49 The DSRSD determined that average wastewater flow from a single-family residence equated to 167 GPD.50 Under this assumption, 22 single-family homes would generate approximately 3,674 GPD of wastewater. Assuming that the average occupancy of an ADU is 2, that would be 66 percent of the 46 City of Pleasanton. 1998. Draft Environmental Impact Report, Happy Valley Specific Plan, Table 20, Estimated ADWF Wastewater Generation with Standard Generation Rates. 47 City of Pleasanton. 1998. Draft Environmental Impact Report, Happy Valley Specific Plan, Table 21, Estimated ADWF Wastewater Generation with Mitigated Generation Rates. 48 City of Pleasanton. 2009. 2005 General Plan 2025 Chapter 8 Water Element. Website: https://www.cityofpleasantonca.gov/civicax/filebank/blobdload.aspx?BlobID=23911. Accessed February 17, 2021. 49 Ibid. 50 Dublin San Ramon Services District. 2021. Fact Sheet. January 1. Website: http://www.dsrsd.com/home/showdocument?id=811. Accessed February 17, 2021.