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7.B. - Page 95 Redwood City Chapter 4.Environmental Impact Analysis cubic feet per second (cfs)� (David Babcock&Associates 2011).This increase is minor and would not exceed the capacity of the existing stormwater drainage system.A WQMP containing BMPs to be utilized by the construction contractor would be prepared to reduce the potential for stormwater quality impacts from stormwater runoff during construction.Additionally,compliance with MRP Provision C.3 requirements would reduce new impacts from stormwater runoff to a less-than- significant level. f. Otherwise substantially degrade water quality? Less-than-Significant New Impact.As described in the discussion in Sections 4.6.a through 4.6.e, the proposed modifications would not result in any construction or operational impacts on water quality.Construction impacts would be reduced through the implementation of a WQMP. Potential construction impacts are addressed above and there are no other means by which construction or operation of the proposed modifications would substantially degrade water quality. New impacts would be less than significant. g. Place housing within a 100 year flood hazard area as mapped on a federal Flood Hazard Boundary or Flood Insurance Rate Map or other flood hazard delineation map? No New Impact.As shown on the Flood Insurance Rate Map (FIRM) Community Panel Number 060325 0011 B,the project site is not located within a 100-year flood hazard area.The project site is located within Flood Zone C which is designated as an area with minimal flooding. Furthermore,the proposed modifications would not include the construction of new housing,and thus would not place housing within a flood zone.No new impact would occur. h. Place within a 100 year flood hazard area structures that would impede or redirect flood flows? No New Impact.As shown on the FIRM Community Panel Number 060325 0011 B,the project site is not located within a 100-year flood hazard area.The project site is located within Flood Zone C which is designated as an area with minimal flooding.As a result,the proposed modifications would not place structures within a flood zone that could impede or redirect flood flows. No new impact would occur. i. Expose people or structures to a significant risk of loss, injury,or death involving flooding, including flooding as a result of the failure of a levee or dam;or inundation by seiche, tsunam% or mudflow? No New Impact.According to the City's General Plan Public Safety Element(Figure PS-5: Dam Inundation Flood Hazards),the project area is not located within any dam or levee inundation area. The closest dam inundation zone to the project site is the Emerald Lake dam inundation zone,which does not extend east of Cedar Street or north of Pennsylvania Avenue and which is approximately 0.30 mile west of the project site. Furthermore,according to the Pacific Institute,the project site is not located in an area predicated to be subject to coastal flooding due to climate change-induced sea level rise by 2100 (Pacific Institute 2012). No new impact would occur. �The existing runoff is 0.69 cfs=Composite C-Factor(0.84)x Rainfall Intensity(0.2 inches/hour)x Area(4.13 acres).The proposed runoff would be 0.70 cfs=Composite C-Factor(0.85)x Rainfall Intensity(0.2 inches/hour)x Area(4.13 acres).The difference between the existing and proposed runoff is (0.70-0.69)=0.01 cfs. Addendum No.2 to the Environmental Impact Report for 4-50 September 2012 the Redwood City Costco Wholesale Project ICF 00154.12