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Related Bristol Mixed -Use Project CEQA Findings of Fact <br />Plans, Program and Policies: <br />PPP WO-1: NPDES/SWPPP. As listed previously. <br />PPP WO-3: WQMP. As listed previously. <br />Impact Finding: The Project would not substantially alter the existing drainage pattern of the site <br />or area, including through the alteration of the course of a stream or river or through the addition <br />of impervious surfaces, in a manner which would substantially increase the rate or amount of surface <br />runoff in a manner which would result in flooding on- or offsite (Draft Supplemental EIR at p. 5.7- <br />15). <br />Facts in Support of Findings: <br />Construction <br />Implementation of the Project requires a SWPPP (included as PPP WQ-1) that would address site <br />specific drainage issues related to construction of the Project and include BMPs to eliminate the <br />potential of flooding or alteration of a drainage pattern during construction activities. This includes <br />regular monitoring and visual inspections during construction activities. Compliance with the <br />Construction General Permit and a SWPPP prepared by a QSD and implemented by a QSP (per <br />PPP WQ-1) as verified by the City through the construction permitting process would prevent <br />construction -related impacts related to potential alteration of a drainage pattern or flooding on or <br />offsite from development activities. Therefore, impacts would be less than significant (Draft <br />Supplemental EIR at p. 5.7-15). <br />Operation <br />As described previously and detailed in Table 5.7-2 of the Draft Supplemental EIR, the proposed <br />Project would result in a decrease of the 2-year, 24-hour storm runoff flowrate by 6.3 percent and <br />the proposed Project would manage runoff with vegetated biotreatment systems that have been <br />designed to accommodate the proposed Project design pursuant to the MS4 Permit and DAMP <br />requirements. The units would filter, treat, and discharge runoff into the existing and upsized offsite <br />storm drains. <br />As part of the permitting approval process, the proposed drainage design and engineering plans <br />would be reviewed by the City's Engineering Division to ensure that the proposed drainage would <br />accommodate the appropriate design flows. Additionally, the City permitting process would ensure <br />that the drainage system specifications adhere to the existing MS4 Permit and DAMP regulations, <br />which would ensure that pollutants are removed prior to discharge. Overall, with compliance to the <br />existing regulations as verified by the City's permitting process, Project impacts related to the <br />capacity of the drainage system and polluted runoff would be less than significant (Draft <br />Supplemental EIR at pp. 5.7-15 through 5.7-16). <br />Plans, Program and Policies: <br />PPP WO-1: NPDES/SWPPP. As listed previously. <br />City of Santa Ana 24 <br />CEQA Findings of Fact <br />September 2024 <br />