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Environmentai Impact Report 2006 -02, General Plan Amendment No. 2010 -1 and Zoning Ordinance <br />Amendment No. 2005 -09 for the Transit Zoning Code <br />June 3, 2010 <br />Page 2 <br />Since the exemption from City Zoning is a result of County ownership, the City zoning would <br />presumably apply if the ownership of the property changed. <br />Water Quality <br />The recommended generic Mitigation Measure MM4.6 -1 for potential surface water quality <br />impacts of runoff from redevelopment pursuant to the Transit Zoning Overlay District (see <br />Pages 4.6 -16 and 17) correctly suggests requirements of the Municipal Stormwater NPDES <br />Program are subject to periodic change. Specific reference should be made to the 0 term <br />Municipal NPDES Stormwater Permit for the Santa Ana Region of Orange County as adopted <br />on May 22, 2009. The 4t" term permit requires substantive changes to the Model WQMP for <br />Orange County, changes that will likely be effective in early 2011. The revised Model WQMP for <br />Orange County will require that each priority development or redevelopment project infiltrate, <br />harvest and re -use, evapotranspire or capture runoff from the 85th percentile 24 hr. storm event <br />( "design capture volume "). Any portion of this volume that is not infiltrated, harvested and re- <br />used, evapotranspired or captured onsite by Low Impact Development (LID) BMPs shall be <br />treated and discharged using LID or similarly effective treatment control BMPs or mitigated. <br />Flood Control <br />Any intensification of land use that might result from the update may increase the overall <br />impervious area and impact local as well as regional drainage. Therefore, we recommend that <br />Item 5.5 in Table 2, Page 24 be modified to read: "Ensure that post - development hydrology and <br />storm water runoff rates and velocities from a site have no significant adverse impact on <br />downstream drainage facilities, flood protection levels, erosion or stream habitat." <br />OCPW -2 <br />cont'd. <br />OCPW -3 <br />OCPW -4 <br />It appears that the 100 -Year Flood Zone boundary depicted in Exhibit A -9, Page A -47 is <br />inconsistent with FEMA's FIRM Maps, Panel 0144) and may need revision. City of Santa Ana, OCPW -5 <br />as floodplain administrator for areas within its municipal boundaries should ensure that all <br />FEMA regulations and floodplain requirements applicable to the Land Use Element are met. <br />The first paragraph under Flood Hazards on Page A -41 of the document needs to be revised. <br />The lower Santa Ana River from Weir Canyon Road to the Pacific Ocean has undergone major <br />improvement as a part of the U.S. Army Corps of Engineers' Santa Ana Mainstem Project. The OCPw -6 <br />reach through Santa Ana consists mostly of a trapezoidal, concrete lined channel with a bottom <br />width of 180 feet. <br />If you have any questions, please contact me at (714) 667 -3217 or Mike Balsamo at (714) 667- <br />8854. <br />Sincerely, . <br />Jess A. ibajal <br />Director, dG Public Works <br />c.-- -- -- ftk-LeFeuvre, Interim Director, OC Planning <br />Mike Balsamo, Manager, OC Planning /General Land Use Planning <br />