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7.B. - Page 92 Redwood City Chapter 4.Environmental Impact Analysis Hydrology and Drainage Impact Discussion The regulatory environment and existing conditions remain the same as described in the 2007 FEIR except for the 2010 City of Redwood City new General Plan.The new General Plan includes the following new policy that is applicable to the proposed modifications: Policy NR-7.2: Encourage the use of site and landscape designs that minimize surface runoff and retain or detain stormwater runoff,minimizing volume and pollutant concentrations. As discussed below,the proposed modifications to the project would not result in any new or more severe significant hydrology or drainage impacts beyond those previously addressed in the 2007 FEIR and 2007 Addendum No. 1,and there are no other changes in circumstances,or new information that would necessitate any major modification of the hydrology and drainage discussions in the 2007 FEIR and 2007 Addendum No. 1. Would the project: a. Violate any water quality standards or waste discharge requirements? Construction Less-than-Significant New Impact.There are no water bodies located within the project site.As described in the 2007 FEIR(page 4.7-1),the nearest water body,Redwood Creek,is located approximately 1 mile west of the project site.Water from the project site is routed to the existing storm drain system,which discharges into Redwood Creek.The creek flows into Steinberger Creek, which ultimately discharges into the San Francisco Bay. The proposed modifications include excavation,grading,paving,and construction activities that include removal of approximately 5,004 sf landscaped area.These activities would require temporary disturbance and exposure of surface soils,which could cause erosion,and the mobilization of sediment and associated pollutants in the runoff.In addition,stockpiling of soil, asphalt,and debris would occur during demolition and excavation activities. If not managed properly,these stockpiles could be exposed to runoff which could enter storm drains and which could violate water quality standards in water courses in the vicinity of the project site,such as Redwood Creek.Pollutants from the project site could include existing asphalt materials,sediment from grading activities,and contaminants associated with construction materials,construction waste,vehicles,and equipment used during construction.Once released,hazardous substances could be transported to nearby surface waterways and/or groundwater in storm water runoff,wash water,and dust control water,potentially reducing the quality of the receiving waters. The proposed modifications would be implemented in a manner consistent with the Redwood City Stormwater Management and Discharge Control Program (SMDCP,contained within Article 27A of the Redwood City Municipal Code) and the Municipal Regional Permit(MRP) National Pollutant Discharge Elimination System (NPDES) Permit No. CAS612008,which outlines BMPs for new and redevelopment projects.The proposed modifications would also receive demolition and grading permits pursuant to the City's NPDES Permit Requirements Checklist that sets forth specific requirements for all construction activities,including development and implementation of a Water Quality Management Plan (WQMP). Addendum No.2 to the Environmental Impact Report for 4 4� September 2012 the Redwood City Costco Wholesale Project ICF 00154.12