2024-053 - Final Supplemental for The Related Bristol Specific Plan Project

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dry year scenarios, and that impacts would be less than significant (Draft Supplemental EIR at p. 5.1 5-1 1 ). Impact Finding: The Project would not require or result in the relocation or construction of new wastewater treatment facilities or expansion of existing facilities, the construction of which could cause significant environmental effects (Draft Supplemental EIR at p. 5.15-15). Facts in Support of Findings: The proposed Project would install a new onsite sewer system that would connect directly to the 78-inch OCSD sewer main in Sunflower Avenue. Based on results of the Sewer Analysis Report (included as Appendix Q to the Draft Supplemental EIR), the proposed Project would install a new onsite sewer system that would connect to the existing 78-inch OCSD sewer main within the Sunflower Avenue right-of-way. The Sewer Analysis Report determined that the Sunflower Avenue OCSD sewer main has a maximum capacity of 96.8 cfs and has adequate capacity to accommodate the additional wastewater flows from the proposed Project. The construction activities related to the new onsite sewer system and connection to the existing 78- inch OCSD sewer main is included as part of the proposed Project and would not result in any physical environmental effects beyond those identified throughout the Draft Supplemental EIR. As the proposed Project includes facilities to serve the Project, it would not result in the need for construction of other new wastewater facilities or expansions, the construction of which could cause significant environmental effects. Therefore, impacts would be less than significant. This determination is consistent with that of the GPU FEIR, which determined that increases in wastewater from buildout of the South Bristol Street Focus Area increases would be accommodated by the OCSD trunk sewer mains that are proximate to the area, and that impacts related to sewer infrastructure would be less than significant (Draft Supplemental EIR at p. 5.15-15). Impact Finding: The Project would not result in a determination by the wastewater treatment provider that would serve the Project that it has adequate capacity to serve the Project's projected demand in addition to the provider's existing commitments (Draft Supplemental EIR at p. 5.15-15). Facts in Support of Findings: The Orange County Sanitation District (OCSD) Reclamation Plant No. 1 has an additional capacity of 52 mgd, which would accommodate the increase in wastewater flow from full occupancy of the proposed Project that would generate 762,241 gpd (0.76 mgd). As a result, implementation of the proposed Project would not result in inadequate capacity of the wastewater treatment plant to serve the Project's demand in addition to existing service commitments, and impacts would be less than significant. This is consistent with the GPU FEIR, which determined that wastewater generated through development in accordance with the GPU would have a less -than -significant impact on the existing wastewater collection and treatment facilities and systems (Draft Supplemental EIR at pp. 5.15-15 through 5.15-1 b). Impact Finding: The Project would not require or result in the relocation or construction of new storm water drainage facilities or expansion of existing facilities, the construction of which could cause significant environmental effects (Draft Supplemental EIR at p. 5.15-20). Facts in Support of Findings: The Preliminary Water Quality Management Plan (WQMP) (included as Appendix M to the Draft Supplemental EIR) for the proposed Project describes that the Project site currently includes 37.02 acres of impermeable surfaces, which equates to 90 percent of the