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6, The drainage map referred to in comment item 5 above also includes contributory drainage acreages from the Cities of Santa Ana, costa Mesa, Newport Beach, Irvine, and Unincorporated Orange County. These acreages differ from those reported on page 2-1, Section 2.2, 2nd paragraph of the IS/MND. Please verify and revise as appropriate. 7. Page 2-7, Section 2.4,1 indicates that the proposed project includes an in -channel diversion structure that will utilize a semi-rigid floatable boon and a one foot high broad crested weir that spans the entire channel, The proposed diversion facility should not worsen existing hydraulic conditions of F01. Existing and post project hydraulic analyses need to be performed to evaluate the proposed project's impact to F01 and mitigation measures proposed in consultations with OC Public Works/Infrastructure Programs/Flood Program Support (FPS), if there are any adverse impacts, 8. Page 2-8, Element 2, 26d paragraph states, "Primary containment will be the storage location of debris and trash collected by the system for channel dry weather flows and flows up to 2 feet of depth" and "Floating debris carried by storm evets greater than 3 feet of depth but under 7 feet of depth will be redirected into the facility by Element 1 and retained by secondary containment chamber." It is unclear what happens to floating debris and flows within the range of 2-3 feet of depth. Please review and add explanation as appropriate. 9. Page 2-9, Element 2, 3`d paragraph states, "At minimum debris captured will be removed from debris storage area every 90 days. For optimum performance debris captured will be removed prior to beginning of each storm season and at conclusion of storm season." Please see also page 2-10: Storm Season Operations and Estimated Trash Removal Operation; page 2-19; Long Term Maintenance Operations; and page 4-3, 2"d paragraph. Please verify maintenance frequencies described in different sections of the IS/MND to ensure consistency. 10, Please state in the iS/MND that an Operations & Maintenance Plan detalling all required maintenance activities, responsibilities, and the frequencies associated with all three project elements: in -channel diversion structure, channel debris removal system, pumping facilities will be prepared. All permits including those from Regulatory Agencies should be shared with OCFCD/County before they are finalized and become part of the O&M Plan. 11. Page 2.10, General Maintenance Operations, the IS/MND states, "However in special circumstances, such as pump removal for replacement, temporary access may be required." The access road has to be moved within the golf course In a manner that does not impact operation of the golf course, 12. Page 2.10, Section 2.4.3, Project Footprint Requirements: This paragraph seems to address the diversion footprint of the project only, It does not discuss the project related to the pipeline and other features outside of County R/W. Please review and add text as appropriate. 13. Page 2-10, Section 2.4.3 states, "The existing access road, currently open for public recreational purposes, will need to be re-established as part of the development of the project." The existing access road is not open for public use at this time. Please revise the text as appropriate. $00 N. Flower Street, Santa Ana, CA 92703 P.Q. Box 4048, Santa Ana, CA 92702-4048 20C-96 www,00publi eworks.com 714.667.8800 t Info@0CPW,009ov.com