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