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The Bowery Mixed-Use Project CEQA Findings of Fact City of Santa Ana 23 May 2020 PPP WQ-2: WQMP. Prior to the approval of the Grading Plan and issuance of Grading Permits a completed Water Quality Management Plan (WQMP) shall be submitted to and approved by the City Building and Safety Division. The WQMP shall identify all Post-Construction, Site Design. Source Control, and Treatment Control Best Management Practices (BMPs) that will be incorporated into the development project in order to minimize the adverse effects on receiving waters. Impact Finding: The Project would not substantially deplete groundwater supplies or interfere substantially with groundwater recharge such that the project may impede sustainable groundwater management of the basin (Draft EIR at p. 5.8-13). Facts in Support of Findings: As detailed in Draft EIR Section 5.16, Utilities and Service Systems, Table 5.8-2 the City’s water supply would be sufficient during both normal years and multiple dry year conditions between 2020 and 2040 to meet all of the City’s estimated needs, including the proposed Project. Therefore, the Project would not result in changes to the projected groundwater pumping that would decrease groundwater supplies. Thus, impacts related to groundwater supplies would be less than significant. In addition, the onsite soils have a low infiltration rate and do not currently provide onsite infiltration; and the Project site is located within an infiltration constraints area (Draft EIR Figure 5.8-1) and infiltration is prohibited due to existing pollutant plumes under or adjacent to the site. Therefore, impacts related to interference with groundwater recharge would be less than significant. Impact Finding: The Project would not substantially alter the existing drainage pattern of the area, including through the alteration of the course of a stream or river or through the addition of impervious surfaces, in a manner which would result in a substantial erosion or siltation on- or off- site (Draft EIR at p. 5.8-14). Facts in Support of Findings: Construction The existing NPDES Construction General Permit and Orange County DAMP require preparation and implementation of a SWPPP by a Qualified SWPPP Developer for the proposed construction activities (included as PPP WQ-1). The SWPPP is required to address site-specific conditions related to potential sources of sedimentation and erosion and would list the required BMPs that are necessary to reduce or eliminate the potential of erosion or alteration of a drainage pattern during construction activities to a less than significant level. Operation The proposed Project would maintain the existing drainage pattern. The runoff from the Project area would be collected by roof drains, surface flow designed pavement, curbs, and area drains and conveyed Modular Wetland System units for treatment. The Modular Wetland System units contain catch basin inlet filters to capture trash, debris, gross solids and sediments, a settling chamber for separating out larger solids, and a media filter cartridge for capturing fine silts, metals, nutrients, and bacteria. The MS4 permit and DAMP require new development projects to prepare a WQMP (included as PPP WQ-2) that is required to include BMPs to reduce the potential of erosion and/or sedimentation through site design and structural treatment control BMPs. The proposed drainage system and adherence to the existing regulations would ensure that Project impacts related to alteration of a drainage pattern and erosion/siltation from operational activities would be less than significant. 3-45