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84 project construction to control contamination of surface flows and the potential discharge of pollutants from commencement of construction through project completion. The SWPPP document itself remains onsite during construction. After completion of the project, the owners are required to submit a Notice of Termination to the RWQCB to indicate that construction is completed. The DTPP program EIR (pp. 10-23 through 10-24) 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. The DTPP Plan-Wide Amendments program SEIR (pp. 10-41 through 10-42) generally concurred with the DTPP EIR conclusion but includes Mitigation Measure UT-8, which relates specifically to proposed realignment and alteration of Arroyo Ojo. Because Mitigation Measure UT-8 would not apply to this project component, the impact would be less than significant, and no mitigation would be required. ii) As discussed in item (a), the project component would not result in substantial surface runoff that would result in flooding on- or offsite. The impact would be less than significant, and no mitigation is required. iii) As discussed in item (a), project 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 project component would result in an increase in total impervious surface area; however, as discussed in item (a), the proposed stormwater management plan would provide for more than the required amount of stormwater treatment via a series of flow-through planters, media filters, and Silva Cells. While there would be adjustments to surface area by type—i.e., building roof, asphalt pavement, concrete pavement, replacement of undeveloped surface area in the Spring Street Parklet—the post-development impervious surface area (97,472 square feet) would be greater than the pre-development impervious surface area (87,403 square feet) (Sandis, “Appendix D: C.3 Development Review Checklist”). As discussed above in item (a), the total surface area requiring stormwater treatment would equal 2,896 SF (1,583 SF onsite and 1,313 SF offsite), and the proposed project component proposes to treat 3,277 SF (1,736 SF onsite and 1,541 SF offsite), an additional 381 SF of treated area. Because the project component would provide treatment of more stormwater than required, the project 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. iv) As analyzed in the DTPP program EIR (pp. 10-17 and 10-22) and discussed in item (d) below, the project component site is currently located in a Special Flood Hazard Area as defined by the Federal Emergency Management Agency (FEMA) National Flood Insurance Program (NFIP). The project component site is located in “Zone AE” with a base flood elevation of 10 feet, which as a designated special flood hazard area is an areas of 1% annual chance flood; also called the “100-year flood,” as indicated on FEMA Map number 06081C0301F Panel 301 of 510, dated April 5, 2019. 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. For these reasons, the project 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 project component site is currently located in a FEMA-designated Special Flood Hazard Area. However, the project component site would not be affected by a tsunami or seiche due to its inland location (about three miles from the shoreline and ten feet above sea level). In light of this location, the impact of the 1900 Broadway project component would be less than significant. This project 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 project 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 ATTY/RESO.0074/CC RESO 847 WOODSIDE (CEQA) - EXHIBIT 1 - CEQA CONSISTENCY CHECKLIST REV: 10-23-24 VR Page 84 of 135