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7.B. - Page 93 Redwood City Chapter 4.Environmental Impact Analysis Demolition and construction activities within the project site would be required by the City and the Regional Water Quality Control Board to comply with all of the above-discussed regulations, ordinances,and standards.Compliance with these regulations would reduce new water quality and drainage impacts to less-than-significant levels. Operation Less-than-Significant New Impact.The original project resulted in no net change of impervious space over what existed previously,according to the 2007 FEIR. Implementation of the proposed modifications would replace approximately 5,004 sf of pervious landscaping with impervious pavement and canopy cover. Runoff from the proposed modifications would flow east towards an existing storm drain catch basin that discharges into Redwood Creek.The proposed modifications would include a retaining wall on the north side of the existing fueling center which would separate the rest of the Costco parking area from the fueling area and prevent runoff of stormwater to the maximum extent possible. The MRP includes requirements (referred to as Provision C.3 requirements) for incorporating post- construction stormwater/Low Impact Development(LID) measures into new development and redevelopment projects. Provision C.3 requires that retail gasoline outlets that create and/or replace 5,000 sf or more of impervious surface treat the runoff from any impervious surface created and/or replaced by a project. LID treatment measures include harvesting and re-use,infiltration, and evapotranspiration,or biotreatment if harvesting,infiltration,and evapotranspiration are shown to be infeasible.If biotreatment will be used,the landscaped bioretention area will need to be approximately 4 percent of the impervious area created and/or replaced by the project. Compliance with Provision C.3 requirements would prevent significant impacts regarding drainage,and would be consistent with Policy NR-7.2 in the General Plan.Therefore,new impacts related to drainage would be less than significant. b. Substantially deplete groundwater supplies or interfere substantially with groundwater recharge such that there would be a net deficit in aquifer volume or a lowering of the local groundwater table level(e.g., the production rate of pre-existing nearby wells would drop to a level that would not support existing land uses or planned uses for which permits have been granted)? Less-than-Significant New Impact.The original project resulted in no net increase in impervious space over what existed previously according to the 2007 FEIR.The proposed modifications would result in the conversion of approximately 5,004 sf of pervious landscaping to impervious surfaces on the project site.As shown in the City's General Plan EIR(Figure 4.8-1,San Mateo Plain Groundwater Sub-Basin),the project site is located within the San Mateo Plain Groundwater Sub-basin area. Although the conversion of 5,004 sf from pervious to impervious land could reduce potential localized recharge to the underlying groundwater aquifer,this area is small relative to the 75 square mile area of the San Mateo Plain Sub-basin area. In addition,the recharge of the Sub-basin primarily occurs in the foothills of the City,where a clay aquitard is not present(City of Redwood City 2010b). Redwood City obtains 100 percent of their water supply from the Hetch Hetchy regional water system and does not use groundwater to serve development within the City(City of Redwood City 2011).As a result,the minimal change in water levels would not affect water supplies.Furthermore, the proposed modifications would not require an increase in water supply to the fueling center. Addendum No.2 to the Environmental Impact Report for 4 48 September 2012 the Redwood City Costco Wholesale Project ICF 00154.12