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

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of impervious surfaces, in a manner which would impede or redirect flood flows (Draft Supplemental EIR at p. 5.7-17). Facts in Support of Findings: The Project site does not include, and is not adjacent to, a stream or river. Implementation of the Project would not alter the course of a stream or river. In addition, according to the FEMA FIRM for the Project area (O6059CO279J), the Project site is located within "Zone X," which is an area determined to be outside of the 0.2 percent annual chance flood. Therefore, there is a low potential for onsite flooding to occur. Implementation of the proposed Project would result in a decrease of impermeable surfaces from 90 percent of the site to 86 percent of the site. The Project would maintain the existing drainage pattern; and drainage would be accommodated by onsite by vegetative biotreatment systems that have been sized to accommodate the DAMP required design storm. Therefore, the Project would not result in impeding or redirecting flood flows by the addition of the impervious surfaces. As detailed previously, the City's permitting process would ensure that the drainage system specifications adhere to the existing MS4 permit and DAMP regulations, and compliance with existing regulations would ensure that impacts would be less than significant (Draft Supplemental EIR at p. 5.7-17). Impact Finding: The Project would not conflict with or obstruct implementation of a water quality control plan or sustainable groundwater management plan (Draft Supplemental EIR at p. 5.7-18). Facts in Support of Findings: Use of BMPs during construction implemented as part of a SWPPP as required by the NPDES Construction General Permit and PPP WQ-1) and a RWQCB Groundwater Discharge Permit (implemented through PPP WQ-2) would serve to ensure that Project impacts related to construction activities resulting in a degradation of water quality would be less than significant. Thus, construction of the proposed Project would not conflict or obstruct implementation of a water quality control plan. Also, development projects are required to implement a WQMP (per the Regional MS4 Permit and PPP WQ-3) that would comply with the Orange County DAMP. The WQMP and applicable BMPs are verified as part of the City's permitting approval process, and construction plans would be required to demonstrate compliance with these regulations. Therefore, operation of the proposed Project would not conflict of obstruct with a water quality control plan. In addition, the OCWD manages basin water supply through the Basin Production Percentage (BPP), such that, the anticipated production of groundwater would remain steady from 2025 through 2040 (as shown in Draft Supplemental EIR Table 5.8-1 ). As detailed in Draft Supplemental EIR Section 5.15, aUtilities and Service Systems, the City's supply of water listed in Draft Supplemental EIR Table 5.7-1 would be sufficient during both normal years and multiple dry year conditions between 2025 and 2045 to meet all of the City's estimated needs, including the proposed Project. Therefore, the Project would be consistent with the groundwater management plan and would not conflict with or obstruct its implementation. Thus, impacts related to water quality control plan or sustainable groundwater management plan would be less than significant (Draft Supplemental EIR at p. 5.7- 18).