2020-065 - Adopting Environmental Findings of Fact

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The Warner Redhill Mixed -Use Project CEQA Findings of Fact Impact Finding: The Project would not require or result in the construction of new wastewater treatment facilities or expansion of existing facilities, the construction of which could cause significant environmental effects (Draft EIR at p. 5.16-11). Facts in Support of Findings: The Project includes replacing approximately 367 feet of the existing 8-inch City sewer line in Warner Avenue, between the Project site and the Orange County Sanitation sewer line in Red Hill Avenue, with a 10-inch sewer. In addition, the Project would install a new onsite sewer system that would connect to off -site City of Santa Ana sewer facilities. Approximately half the Project site would discharge wastewater directly into a City - owned manhole located at the intersection of Warner Avenue and Red Hill Avenue. The other half of the Project site would discharge wastewater into the improved 10-inch sewer in Warner Avenue to the existing 42-inch sewer in Red Hill Avenue. Based on results of the sewer flow monitoring and the City's Design Criteria for wastewater generation rates, the sewer lines that would serve the Project site would have a peak flow half full capacity of 0.65 cfs which would is adequate capacity to accommodate the additional wastewater flows from the proposed Project. The construction activities related to replacing 367 feet of 8-inch water line with 10-inch water line within the Warner Avenue right of way and installation of the onsite sewer infrastructure that would serve the proposed Project, is included as part of the proposed Project and would not result in any physical environmental effects beyond those identified throughout the Draft 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. Impact Finding: The Project would not 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 (Draft EIR at p. 5.16-1 1). Facts in Support of Findings: The OCSD Reclamation Plant No. 1 has an additional capacity of 87 mgd, which would accommodate the increase in wastewater flow from full occupancy of the proposed Project that would generate 201,906 gpd. 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. Drainaae Impact Finding: The Project would not require or result in the construction of new storm water drainage facilities or expansion of existing facilities, the construction of which could cause significant environmental effects (Draft EIR at p. 5.16-13). Facts in Support of Findings: The runoff within the Project site would be collected by roof drains, surface flow designed pavement, curbs, and area drains and conveyed to Modular Wetland System units that would be installed as part of the Project to retain, filter, and slowly discharge drainage. The Modular Wetland System units have been sized to treat runoff from the Design Capture Storm (85th percentile, 24-hour). Treated runoff from the Modular Wetland System units would be discharged from the flow controlling Modular Wetland System units to the existing 84- inch drain located within Red Hill Avenue. From there, flows would travel southeast and be temporarily detained in an existing flood control basin before entering the Barranca Channel, City of Santa Ana 39 May 2020