ITEM 23 ATTACHMENT 1 - CEQA Checklist

City of Pleasanton—Merritt Property Project Consistency Checklist 15183 Consistency Checklist 134 to comply with the NPDES General Permit and WDR for the discharge of stormwater runoff from the Municipal Separate Storm Sewer Systems (MS4s), which are permitted under the San Francisco Bay Municipal Regional Stormwater Permit (MRP). Compliance with these requirements would include the development and implementation of a SWPPP, which would include erosion and sediment controls, runoff water quality monitoring, proper waste disposal, implementation of approved local plans, control of construction sediment and erosion control measures, and identification of maintenance responsibilities, as well as non-stormwater management controls. The SWPPP would manage stormwater flows during construction of the proposed project, thereby preventing pollutants entering the surrounding water system and reducing the impact to water quality. The specific BMPs that would be implemented at the project site are detailed in the Stormwater Requirements Checklist prepared for the proposed project (Appendix G). As discussed in Section XXVIII, Utilities and Service Systems, stormwater runoff from the proposed project would be collected and directed toward an underground storm system, where it would be stored and metered out of a proposed detention basin to be located at the eastern end of the project site. Details of the storm drain bypass can be found in the Hydrology and Hydraulic Calculations for Existing Off-site Drainage and Proposed Storm Drain Bypass report prepared for the proposed project by Ruggeri-Jensen- Azar (RJA) (Appendix G). As the proposed project would include drainage and stormwater improvements and would be subject to the NPDES General Permit (including the SWPPP and associated BMPs), WDRs, the impacts associated with water quality, drainage patterns, erosion/siltation, storm drain capacity, polluted runoff, and flood flows would be less than significant. As the project site is partially within the 100- and 500-year floodplain, there is the potential that inundation due to flood could result in the release of pollutants. However, as only a small portion of the project site is within the floodplain, the risk of a substantial release of pollutants is minimal. The project site is not in the vicinity of the ocean or other large body of water, and there would be no risk of inundation due to seiches or tsunamis at the project site. As discussed in Section IX, Hazards and Hazardous Materials, the proposed project would be subject to several existing laws and regulations that require proper storage of hazardous materials—further reducing the potential for a release. The impacts associated with the release of pollutants due to