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n . ;.,1'ublicWorks <br />rnteerffy, Acaounteb /Iffy, Srrvlee, rrjref <br />Shane L, alteby, Director <br />March i8, 2016 <br />Mr. Danlel Bott, Principal Planner <br />Orange County Water District <br />18700 Ward Street <br />Fountain Valley, California 927011 <br />Net -15 -021 <br />Subject: Recirculated Notice of Availability of a Draft Environmental Impact Report for the Orange <br />County Water District Mid Basin Centennial Park Injection Well Project <br />Dear Mr. Bott: <br />The County of Orange has reviewed the Recirculated Notice of Availability of a Draft Environmental <br />Impact Report for the Orange County Water District Mid Basin Centennial Park Injection Well <br />Project and offers the following comments; <br />Flgod Programs° - <br />1. Prior to final design of the Mid Basin Centennial Park Injection Wells Project, please consult the <br />Orange County Public Works /Environmental Resources service area to obtain their -° <br />recommendations regarding the water quality Issues associated with back flushing waters <br />discharging into the Greenville - banning Channel (D03). <br />If you have any questions or need clarification please do not hesitate to contact Robert McLean at <br />(714) 647 -3951 or Anna Brezezicki at (714) 647 -3989. <br />Enyironmantal Resources.• <br />1. Section 5.8, Hydr0l0gy/Water Quality: Sub - Section 5.8.4, Project impact HWQ3, dessoribes the <br />Injection well backflushing operations at occurring weekly or every two weeks and having the <br />potential to discharge up to 70,000 gallons of well water per minute Into Centennial Lake (page ✓J <br />5 -131). It was confirmed with OcWD Project Engineer, Ben Smith, that this discharge rate is <br />incorrect. The correct discharge rate should be 3,500 gallons per minute for 20 minutes per <br />well (personal communication with Ban Smith on 3/8/16). The EIR should be updated to <br />include the corrected discharge rate. <br />2, Sections 5.83, Threshold of Signiflcance (page 5 -114) and 5.8.4, Project impacts (page 5.115): j) <br />These sections are mislabeled as 5.73 and 51.4, respectively. They should be 5.83 and <br />respectively. <br />a n, rt w straal, Santa Ana, CA 62703 <br />P.O, Hat 4048, Suds Am CA 927024M <br />25C -398 <br />www,acpuhlia ksmm <br />714,887.8800 1 Infa40CPW. cgay.mm <br />