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Environmental Impact Report 2006-02, General Plan Amendment No. 2010-i 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 OCPw-2 <br /> presumably apply if the ownership of the property changed. contd. <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 4'" term <br /> Municipa[ NPDES Stormwater Permit for the Santa Ana Region of Orange County as adopted OCPW-3 <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 OCPW-4 <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 /> 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 /> Sincerelyti_ <br /> ~ - <br /> - ~ ~ <br /> f. <br /> Jess A. -~r~ajal <br /> <br /> ~ Director, O`G Public Works, <br /> ~ <br /> h <br /> c'~- -_1~CbrLeFeuvre, Interim Director, OC Planning <br /> Mike Balsamo, Manager, OC Planning/General Land Use Planning <br /> <br />