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97 iii) As discussed in item (a), Commercial Component stormwater control measures would be designed to meet C.3 stormwater criteria and would thereby minimize potential project component-related pollutant runoff. These control measures would be required to meet City storm drain design criteria to maintain post-development peak runoff rates and average volume of runoff similar to existing pre-development levels. This would be expected to minimize impacts on downstream drainage systems. The proposed Commercial Component would result in a decrease in total impervious surface area. As discussed in item (a), the proposed stormwater management plan stormwater from the subject site would be treated with a combination of raised and at-grade flow-through bioretention planters with impermeable liners and perforated underdrains within bioretention areas is sized according to C.3 Technical Guidance. At-grade flow-through bioretention planters would also be installed on project frontages to treat runoff from El Camino Real, James Street, Winklebleck Street, and Franklin Avenue to meet the requirements of MRP 3.0. The Commercial Component would provide the required amount of stormwater treatment. The post-development impervious surface area (54,660 square feet) would be less than the pre-development impervious surface area (56,570 square feet) (BKF, Attachment 7 (C.3 Checklist)). Because the Commercial Component would reduce the amount of on-site impervious surface area and treat stormwater in compliance with MRP 3.0 requirements, the Commercial Component would not create a substantial additional source of polluted runoff or substantially increase runoff compared to the existing condition, and the project component impact would be less than significant. The Commercial Component would be consistent with the analysis in the EIR/SEIR, and it would not create new impacts or increase impacts, and there is no new information of substantial importance for CEQA purposes. iv) As analyzed in the DTPP program EIR (pp. 10-17 and 10-22) and discussed in item (d) below, the Commercial Component site is located in two types of flood zone categories, Zone X (areas of 0.2% annual change flood; areas of 1% chance annual flood with average depths of less than one foot or with drainage areas less than one square mile) and Zone X (areas of minimal flood hazard), as shown on Federal Emergency Management Agency (FEMA) Flood Insurance Rate Map (FIRM) No. 06081C0301F, effective April 5, 2019. The Commercial Component site is located in a Special Flood Hazard Area (SFHA) as defined by the FEMA National Flood Insurance Program (NFIP). As discussed in the DTPP program EIR (p. 10-25), standard City requirements for flood protection, as applicable, would ensure that potential impacts from flooding would be less than significant. The DTPP Plan-Wide Amendments program SEIR (p. 10-42) concurred with the DTPP EIR conclusion. The Commercial Component will be subject to the City’s standard requirements for flood protection as a condition of approval. For these reasons, the Commercial Component impact would be consistent with the analysis in the EIR/SEIR because it would not create new impacts or increase impacts, and there is no new information of substantial importance for CEQA purposes. d. The DTPP program EIR (pp. 10-25 through 10-27) concluded that impacts on DTPP-facilitated development related to flood hazards, tsunami, and seiche would be less than significant, and no mitigation is required. The DTPP Plan- Wide Amendments program SEIR (p. 10-42) concurred with the DTPP EIR conclusion. As analyzed in the DTPP program EIR (pp. 10-17 and 10-22) and discussed in item (c)(iv) above, the Commercial Component site is currently located in a FEMA-designated Special Flood Hazard Area. However, the Commercial Component site would not be affected by a tsunami or seiche due to its inland location (over one mile from the shoreline). In light of this location, the impact of the Commercial Component would be less than significant. This component would be consistent with the analysis in the EIR/SEIR because it would not create new impacts or increase impacts, and there is no new information of substantial importance for CEQA purposes. e. The DTPP program EIR (pp. 10-23 through 10-25) concluded that DTPP-facilitated development would not violate water quality standards or conflict with goals and objectives in water quality control plans and sustainable groundwater management plans. The DTPP Plan-Wide Amendments program SEIR (pp. 10-42 through 10-43) concurred with the DTPP EIR conclusion finding that the impact would be less than significant, and no mitigation is required. The Commercial Component would be required to comply with the County's stormwater runoff treatment standards and would therefore be consistent with the San Francisco Bay Regional Water Quality Control Board Basin Plan, which designates water quality objectives for surface waters and groundwater and includes implementation programs to achieve water quality objectives. As discussed in item (b), the Commercial Component is not in an area subject to a groundwater management plan and therefore would not conflict with any groundwater management plan. The Commercial Component would be required to comply with Redwood City Municipal Code Chapter 27A, which governs discharge of pollutants in water. For these reasons, the Commercial Component’s impacts would be less than significant. This component would be consistent with the analysis in the EIR/SEIR because it would not create new impacts or increase impacts, and there is no new information of substantial importance for CEQA purposes. ATTY/RESO.0031/CC RESO CEQA GUIDELINES (901 EL CAMINO REAL) REV: 04-22-25 VR Page 97 of 148