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The Warner Redhill Mixed -Use Project CEQA Findings of Fact <br />MS4 permit and DAMP regulations would ensure that Project impacts related to alteration of a <br />drainage pattern or flooding from operational activities would be less than significant. <br />Plans, Program and Policies <br />PPP WQ-1: NPDES/SWPPP. As listed previously. <br />PPP WO-2: 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 create or contribute runoff water which would <br />exceed the capacity of existing or planned stormwater drainage systems or provide substantial <br />additional sources of polluted runoff (Draft EIR at p. 5.8-16). <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 pollutant and drainage issues related to construction of the Project and include BMPs to <br />eliminate the potential of polluted runoff and increased runoff during construction activities. This <br />includes regular monitoring and visual inspections during construction activities. Compliance with <br />the Construction General Permit and a SWPPP prepared by a QSD and implemented by a QSP <br />(per PPP WQ-1) as verified by the City through the construction permitting process would prevent <br />construction -related impacts related to increases in run-off and pollution from development <br />activities. Therefore, impacts would be less than significant. <br />Operation <br />The Project would manage increased stormwater flow with Modular Wetland System units that <br />have been designed to accommodate the increased volume pursuant to the MS4 permit and <br />DAMP requirements. The units would retain, filter, treat, and slowly discharge runoff into the <br />existing off -site drain. Additionally, the City permitting process would ensure that the drainage <br />system accommodate new flows and that specifications adhere to the existing MS4 permit and <br />DAMP regulations, which would ensure that pollutants are removed prior to discharge. Overall, <br />with compliance to the existing regulations as verified by the City's permitting process, Project <br />impacts related to the capacity of the drainage system and polluted runoff would be less than <br />significant. <br />Plans, Program and Policies <br />PPP WO-1: NPDES/SWPPP. As listed previously. <br />PPP WQ-2: WQMP. As listed previously. <br />Impact Finding: The Project would substantially alter the existing drainage pattern of the site or <br />area, including through the alteration of the course of a stream or river or through the addition of <br />impervious surfaces, in a manner which would impede or redirect flood flows (Draft EIR at p. 5.8- <br />17). <br />Facts in Support of Findings: The Project site does not include, and is not adjacent to, a stream or <br />river. Implementation of the Project would not alter the course of a stream or river. In addition, <br />according to the FEMA FIRM for the Project area (06059CO279J), the Project site is located within <br />City of Santa Ana <br />May 2020 <br />