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7.B. - Page 105 Redwood City Chapter 4.Environmental Impact Analysis Would the project: a. Exceed wastewater treatment requirements of the applicable Regional Water Quality Control Board? No New Impact.The proposed modifications do not include the construction of any habitable structures or other facilities that would increase or otherwise change the existing wastewater treatment requirements. No new impact would occur. b. Require or result in the construction of new water or wastewater treatment facilities or expansion of existing facilities, the construction of which could cause significant environmental effects? No New Impact.The proposed modifications do not include the construction of any habitable structures.The proposed modifications would not develop any permanent structures,additional housing or employment that would require an increased demand for water or wastewater disposal services.Therefore,the proposed modifications would not require expansion or construction of new water or wastewater treatment facilities.No new impact would occur. c. Require or result in the construction of new stormwater drainage facilities or expansion of existing facilities, the construction of which could cause significant environmental effects? Less-than-Significant New Impact. In compliance with MRP Provision C.3 requirements described in Section 4.6.a, Redwood City requires BMPs,such as LID treatments,for new development, redevelopment,or infill projects that would create 5,000 sf or more of impervious surface.This BMP requirement would apply to the proposed modifications,which would convert approximately 5,004 sf of existing pervious surfaces to impervious surfaces.The installation of LID treatment measures would reduce the rate and volume of stormwater runoff discharged from the project site. Additionally,stormwater generated at the project site would feed into a relocated storm drain associated with the existing fueling center,which includes an oil/water separator and storm filter. As described in Section 4.6,Hydrology and Water Quality,the construction contractor would implement a WQMP that would ensure that construction activities would not result in a substantial increased volume of stormwater runoff. Furthermore,the total Costco site area totals approximately 594,594 sf.The reduction of 5,004 sf of onsite pervious surfaces associated with the proposed modifications represents approximately 0.8 percent of the total Costco site area. Furthermore,the proposed modifications would return the project site to the same amount of pervious surfaces as were analyzed in the 2007 FEIR,the analysis of which concluded that there would be no significant impact.As such,the proposed modifications are not expected to result in a substantial increased generation of stormwater or require the construction of new facilities to accommodate future stormwater drainage rates associated with the project site.Therefore,new impacts on stormwater drainage facilities would be less than significant. d. Have sufficient water supplies available to serve the project from existing entitlements and resources, or would new or expanded entitlements be needed? No New Impact.As discussed in Section 4.9.b,the proposed modifications would not construct any habitable structures or employment which would result in an increased demand for domestic water services.No new impact would occur. Addendum No.2 to the Environmental Impact Report for 4-60 September 2012 the Redwood City Costco Wholesale Project ICF 00154.12