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ENVIRONMENTAL IMPACT REPORT ADDENDUM Bristol Street and Memory Lane Intersection Improvements —Project No. 17-6883 d) Substantially alter the existing dramige pattern ofthe she or area ntchu ing through the alteration of fixe course of a sheer, or river, or substantially increase the rate or amoa id of surface rammQrin a manner that would result inflooding on- or QQ=sde? Currently, theProject site only includes curb and no catch basin is present As a result, seasonal ponding does occur along this portion of Bristol Street The proposed Project would result in a nominal increase in impervious ground surfaces. However, development of the Project would result in the relocation of the existing curb features at the Project site Thus, implementation of the proposed Project would not result in a substantial increase compared to the existing condition. Further, Project development may include extension of the existing storm water pipeline system located on the eastern side of Bristol Street) through a new lateral connection and new catch basin at the Project site These improvements, if constructed, would result in a reduction of existing flooding and would be a beneficial impact Thus, impacts would not be greater than previously analyzed in the 1990 FEIS/EIR. Certifled 1990 FEIS/EIR Mitigation Measures: No 1990 FEIS/EIR mitigation measures are applicable Mitigation Measures: No additional mitigation measures are required. e) Create or contribute runoff seater which would exceed the capacity of existing or planned storm seater drainage systems or provide substantial additional sources ofpohhrtednmof/7 Refer to Response 3.9(a). Impacts would not be greater than previously analyzed in the 1990 FEIS/EIR Cerfifled 1990 FEIS/EIR Mitigation Measures: No 1990 FEIS/EIR mitigation measures are applicable Mitigation Measures: No additional mitigation measures are required. Otherwise substantially degrade water quality? Refer to Response 3.9(a). Impacts would not be greater than previously analyzed in the 1990 FEIS/EIR Cerfifled 1990 FEIS/EIR Mitigation Measures: No 1990 FEIS/EIR mitigation measures are applicable Mitigation Measures: No additional mitigation measures are required. g) Place homing withinn700-yearfloodhayard area inmapped on afederal F7oodAayardBoaunday or F7oodlnsurance Rate Map or otherfloodhayarddelineation map? The Project site is located outside of the 100 -year flood zone." Further, the proposed Project would not construct any housing. Therefore, no impact would result from the proposed Project in this regard. Impacts would not be greater than previously analyzed in the 1990 FEIS/EIR. Certifled 1990 FEIS/EIR Mitigation Measures: No 1990 FEIS/EIR mitigation measures are applicable Mitigation Measures: No additional mitigation measures arerequired. h) Place within nl00yeaifloodhasardarea structures which would impede or redhectfloodflows? Refer to Response 3.9( g). Impacts would not be greater than previously analyzed in the 1990 FEIS/EIR. Cerfified 1990 FEIS/EIR Mitigation Measures: No 1990 FEIS/EIR mitigation measures are applicable Mitigation Measures: No additional mitigation measures are required. 14 Federal Emergency Management Agency, FEMA Flood Map ;Service Center, hltps://msc.fema.gov/portal/search? AddressQuery—memory%201anO/aC%20smta%20ana#searctvesWtsmchor, accessed August 3,2017. Final I December 2017 3-18 Environmental Consequences City Council 14 – 66 2/17/2026