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2.0 RESPONSE TO COMMENTS <br />2.1 COMMENTS FROM ORANGE COUNTY PUBLIC WORKS (FLOOD PROGRAMS <br />ENVIRONMENTAL RESOURCES, AND TRAILS) - FEBRUARY 24, 2016 <br />2.1.1 Flood Programs <br />1. Comment: Request the IS/MND consistently address the County/ OCFCD as one of <br />project proponents along with the Cities of Santa Ana, Newport Beach and Costa Mesa. <br />Response: Comment noted. All references to the Project Proponents should include <br />County / OCFCD. <br />2. Comment: Change reference to Watershed Protection Group in Section 1.0 to <br />Environmental Resources. <br />Response: Comment noted. The name change is acknowledged. <br />3. Comment: Correct typo, reference are listed in Section 6.0, not 7.0. <br />Response: Comment noted. <br />4. Comment: Please verify acreage of Santa Ana Delhi Channel (F01) catchment area. <br />Response: OCFCD provided a new watershed drainage area map that shows a FO watershed <br />area of 10,900 acres. This new map is provided as Attachment B of this Response to <br />Comment document. <br />5. Comment: Please verify drainage boundaries of Santa Ana Delhi (F01), Santa Ana <br />Gardens (1702) and Paularino (F03) shown in the Figure 1 of the MND versus the F01 <br />Proposed Diversion Structure Watersheds map provided by the OCFCD to the City of <br />Santa Ana. <br />Response: OCFCD provided a new watershed drainage area map showing boundaries for FOl, <br />F02 and F03. This newer map is included as Attachment B and would supersede Figure 1 in <br />the IS /MND. <br />6. Comment: Based on the new drainage area map provided, please verify the <br />contributory acreages of the Cities of Santa Ana, Costa Mesa, Newport Beach, Irvine <br />and Unincorporated Orange County. <br />Response: Based on the new drainage area map provided by OCFCD, the contributory <br />acreages of the Cities of Santa Ana, Costa Mesa, Newport Beach, Irvine and Unincorporated <br />Orange County are: 6983, 3019, 128, 159 and 611 acres, respectively. <br />7. Comment: The proposed diversion should not worsen existing hydraulic conditions of <br />FOI. Existing and post project hydraulic analysis need to be performed to evaluate the <br />project's impact to F01 and mitigation measures proposed in consultation with OCPW <br />if there are any adverse impacts. <br />Response: The project is designed in accordance with the OC Flood Design Manual to meet <br />all requirements for maintaining the flood control capacity of the channel. Hydraulic analyses <br />have been performed by URS in coordination with OCFCD and provided in the Hydraulic <br />411 • <br />