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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 drainage pattern of the site or area, including through the alteration <br />of the course of a stream or river, or substantially increase the rate or amount of surface runoff in a <br />manner that would result in flooding on- or off-site? <br />Currently, the Project 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 />Certified 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 water which would exceed the capacity of existing or planned storm <br />water drainage systems or provide substantial additional sources ofpolluted runoff? <br />Refer to Response 3.9(a). Impacts would not be greater than previously analyzed in the 1990 FEIS/EIR. <br />Certified 1990 FEIS/EIR Mitigation Measures: No 1990 FEIS/EIR mitigation measures are applicable. <br />Mitigation Measures: No additional mitigation measures are required. <br />f) 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 />Certified 1990 FEIS/EIR Mitigation Measures: No 1990 FEIS/EIR mitigation measures are applicable. <br />Mitigation Measures: No additional mitigation measures are required. <br />9) Place housing within a 100 year flood hazard area as mapped oil a federal Flood Hazard Boundary <br />or Flood Insurance Rate Map or other flood hazard delineation nap? <br />The Project site is located outside of the 100 -year flood zone.14 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 />Certified 1990 FEIS/EIR Mitigation Measures: No 1990 FEIS/EIR mitigation measures are applicable. <br />Mitigation Measures: No additional mitigation measures are required. <br />h) Place within a 100year flood hazard area structures which would impede or redirect flood flows? <br />Refer to Response 3.9(g). Impacts would not be greater than previously analyzed in the 1990 FEIS/EIR. <br />Certified 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, https://msc.fema.gov/portaUse=h? <br />AddressQuery=memory%201ane%2C%20santa%20ana#seamhresultsmehor, accessed August 3, 2017. <br />Draft I November 2017 3-18 Environmental Consequences <br />75A-47 <br />