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6, The drainage map referred to in comment item 5 above also includes contributory drainage <br />acreages from the Cities of Santa Ana, Costa Mesa, Newport Beach, Irvine, and Unincorporated <br />Orange County. These acreages differ from those reported on page 2-1, Section 2.2, 2nd <br />paragraph of the IS/MND. Please verify and revise as appropriate. <br />7. Page 2-7, Section 2.4.1 indicates that the proposed project includes an in -channel diversion <br />structure that will utilize a semi -rigid floatable boon and a one foot high broad crested weir <br />that spans the entire channel. The proposed diversion facility should not worsen existing <br />hydraulic conditions of F01. Existing and post project hydraulic analyses need to be performed <br />to evaluate the proposed project's impact to F01 and mitigation measures proposed in <br />consultations with OC Public Works/Infrastructure Programs/Flood Program Support (FPS), if <br />there are any adverse impacts. <br />8. Page 2-8, Element 2, 20d paragraph states, "Primary containment will be the storage location of <br />debris and trash collected by the system for channel dry weather flows and flows up to 2 feet <br />of depth" and "Floating debris carried by storm evets greater than 3 feet of depth but under 7 <br />feet of depth will be redirected into the facility by Element 1 and retained by secondary <br />containment chamber." It is unclear what happens to floating debris and flows within the <br />range of 2-3 feet of depth. Please review and add explanation as appropriate. <br />9. Page 2-8, Element 2, 3`d paragraph states, "At minimum debris captured will be removed from <br />debris storage area every 90 days. For optimum performance debris captured will be removed <br />prior to beginning of each storm season and at conclusion of storm season." Please see also <br />page 2-10: Storm Season Operations and Estimated Trash Removal Operation; page 2-19: Long <br />Term Maintenance Operations; and page 4-3, 2"d paragraph. Please verify maintenance <br />frequencies described in different sections of the IS/MND to ensure consistency. <br />10. Please state in the IS/MND that an Operations & Maintenance Plan detailing all required <br />maintenance activities, responsibilities, and the frequencies associated with all three project <br />elements: in -channel diversion structure, channel debris removal system, pumping facilities <br />will be prepared. All permits including those from Regulatory Agencies should be shared with <br />OCFCD/County before they are finalized and become part of the 0&M Plan. <br />11. Page 2-10, General Maintenance Operations, the IS/MND states, "However in special <br />circumstances, such as pump removal for replacement, temporary access may be required." <br />The access road has to be moved within the golf course in a manner that does not impact <br />operation of the golf course. <br />12. Page 2-10, Section 2.4.3, Project Footprint Requirements: This paragraph seems to address the <br />diversion footprint of the project only. It does not discuss the project related to the pipeline <br />and other features outside of County R/W. Please review and add text as appropriate. <br />13. Page 2-10, Section 2.4.3 states, "The existing access road, currently open for public <br />recreational purposes, will need to be re-established as part of the development of the <br />project." The existing access road is not open for public use at this time. Please revise the text <br />as appropriate. <br />300 N. Flower Street, Santa Ana, CA 92703 <br />P.O. Box 4048, Santa Ana, CA 92702-404B <br />www.ocpublimorks.com <br />714.667.8800 4 Info@OCPW.oWov.com <br />20B-20 <br />