Reso25 16295 - Laserfiche WebLink

Browse Search

100 new development would be required to comply with the City regulations regarding stormwater and stormwater management, the San Mateo Countywide Water Pollution Prevention Program, and the San Francisco Bay Region Municipal Regional Stormwater NPDES Permit (MRP). i) As discussed in item (a), the Housing Component would be subject to Water Board construction requirements (in particular, see NPDES MRP section “C.6. Construction Site Control”). The Focused GPU program EIR (pp. 4.10-19 and 4.10-21) concluded that possible construction period erosion and contamination effects would be adequately mitigated with the required implementation of the extensive City, County, and RWQCB requirements, which would be implemented during construction and monitored by the City Engineer. ii) As discussed in item (a), the Housing Component would result in a net decrease in impervious surface area and therefore would not result in substantial surface runoff that would result in flooding onsite or offsite. The impact would be less than significant, and no mitigation is required. iii) As discussed in item (a), Housing 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. As also discussed in item (a), the proposed Housing Component would result in a decrease in total impervious surface area. The post-development impervious surface area (28,197 SF) would be less than the pre-development impervious surface area (32,767 SF) (Plan Set, Sheet C-6.1, 11/2022). Because the Housing Component would provide onsite treatment of stormwater, it would not create a substantial additional source of polluted runoff or substantially increase runoff compared to existing conditions. This impact would be less than significant. iv) As analyzed in the Focused GPU program EIR (pp. 4.10-20 and 4.10-21) and discussed in item (d) below, a sizeable portion of the Focused GPU planning area is mapped as flood hazard zones with “0.2% annual chance [500- year] flood hazard; areas of 1% annual chance [100-year] flood with average depth less than 1 foot or with drainage areas of less than one square mile.” The Housing Component site is designated as Zone X (areas of minimal flood hazard) on FEMA Flood Insurance Rate Map (FIRM) No. 06081C0301F, effective April 5, 2019. Zone X is not a FEMA Special Flood Hazard Area. As discussed in the Focused GPU program EIR (pp. 4.10-19 through 4.10-21), standard City requirements for flood protection, as applicable, would ensure that potential impacts from flooding would be less than significant. For these reasons, the Housing Component impact would be consistent with the analysis in the Focused GPU EIR because it would not create new impacts or increase impacts, and there is no new information of substantial importance for CEQA purposes. d. The Focused GPU program EIR (pp. 4.10-22 and 4.10-23) concluded that impacts of Focused GPU-facilitated development related to flood hazards, tsunami, and seiche, including risk of release of pollutants, would be less than significant, and no mitigation is required. As analyzed in the Focused GPU program EIR (pp. 4.10-21 through 4.10- 23) and discussed in item (c)(iv) above, the Housing Component site is not currently located in a FEMA-designated Special Flood Hazard Area. In addition, the project 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 Housing Component would be less than significant. This Housing Component would be consistent with the analysis in the Focused GPU EIR because it would not create new impacts or increase impacts, and there is no new information of substantial importance for CEQA purposes. e. The Focused GPU program EIR (Focused GPU program EIR pp. 4.10-23 through 4.10-24) concluded that because future development facilitated by the Focused GPU, including the Housing Component, would not utilize groundwater, and as a result there would be no conflict with or obstruction of implementation of a sustainable groundwater management plan from future Focused GPU development, the impact would be less than significant, and no mitigation is required. The Housing 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. The Housing Component would be required to comply with Redwood City Municipal Code Chapter 27A, which governs discharge of pollutants in water. In addition, as discussed in item (b), the Housing Component is not in an area subject to a groundwater management plan and therefore would not conflict with a groundwater management plan. For these reasons, the 920 Shasta Street project component’s impacts would be ATTY/RESO.0028/CC RESO CEQA GUIDLINES (920 SHASTA) - EXHIBIT A REV: 04-22-25 VR Page 100 of 148