14 ATTACHMENT 6 - Appendix A - E

City of Pleasanton–Spotorno Ranch Reduced Development Project Initial Study/Consistency Checklist Environmental Checklist FirstCarbon Solutions 165 https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480021/Consistency Checklist/21480021 Spotorno Ranch Consistency Checklist ScreenCheck.docx HVSP FEIR. Additionally, the proposed project would implement mitigation measures E1 and E3 as conditions of approval, as previously discussed. As a result, the proposed project would not require the construction of new water facilities and would not result in impacts related to potable water supply beyond those previously analyzed in the 1998 HVSP FEIR. c) Wastewater Treatment Capacity Would the project: Result in a determination by the wastewater treatment provider which serves or may serve the project that it has adequate capacity to serve the project’s projected demand in addition to the provider’s existing commitments? The 1998 HVSP FEIR determined that the additional flows generated by the project could contribute to a possible future shortfall of treatment capacity at the DSRSD Wastewater Treatment Plant (WWTP). According to Table 22, Pleasanton currently has 0.685 MGD of treatment capacity available at the DSRSD plant after existing flows and legally committed reserves. Wastewater generated by development permitted by the HVSP (approximately 0.80 MGD, estimated based on the mitigated generation rates) would reduce remaining capacity to about 0.605 MGD, and when non-legally committed reserves are included, Pleasanton has 0.445 MGD of remaining treatment capacity available. Development permitted by the HVSP would reduce remaining capacity to about 0.365 MGD.54 The impact of increased wastewater flows was not considered a significant project-level impact but was considered a potentially cumulative impact. The 1998 HVSP FEIR determined that potential cumulative impacts related to wastewater treatment capacity and wastewater export capacity may occur. Increase in wastewater flows generated by the project site, in conjunction with wastewater flows generated by other Pleasanton projects, would contribute to the DSRSD's need to expand treatment capacity at the WWTP. The wastewater export demand of the Specific Plan project, together with demand generated by other future development, would contribute to an impending shortfall of Pleasanton's export capacity in the LAVWMA pipeline and to LAVWMA's anticipated need to expand pipeline capacity. This project would result in a significant impact if the wastewater treatment provider would not be able to serve the project with adequate capacity. Wastewater generated in Pleasanton is treated at the DSRSD’s RWTF. Owned and operated by the DSRSD, this plant has an average daily dry weather flow of 17 MGD. As discussed previously, the City of Pleasanton is entitled to half this treatment capacity, or 8.5 MGD. The City’s average annual wastewater flow is approximately 6.0 MGD, which leaves 2.5 MGD of remaining capacity. This remaining capacity is sufficient to serve Pleasanton’s planned buildout growth as anticipated in the General Plan. The proposed project would generate an estimated 6,099 GPD of wastewater as calculated previously. As such, this project’s wastewater generation represents 0.15 percent of the remaining 2.5 MGD capacity. Further, as described previously, the proposed project is consistent with General Plan and HVSP buildout projections, and, therefore, the wastewater treatment needs of the proposed project have been accounted for in long-range planning efforts. There is sufficient capacity to serve the project’s projected demand in addition to existing commitments. Therefore, the proposed project would not require the 54 City of Pleasanton. 1998. Draft Environmental Impact Report, Happy Valley Specific Plan, Table 22, Wastewater Treatment Capacity Demand and Supply Relationships (MGD).