75B - PH - AMEND ZONING 2001 W MACARTHUR

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ENVIROVUENTAL IUP40T REPORT.AOPRNOVM lARM1rEONO AANC1r: REV15E0 PROJECT ERP,TEYEER. 2e17 EANTA.ANA, CALIFORNIA increase in water demand h'ad been accounted for in the UNVMP demand projections...As such; the Rei iced Project would not necessitate new or,expanded water entitlements and the.City wonld be able to acconnnodatclhe increased demand for potable water and impacts related ,to water demand would he less 'than significam, The Revised Project Would notresult in new significant. impacts beyond those,idcntifiM in the Certified' EIR. No new.midgation is required. Wastewater. -T le Project site, is located within the jurisdiction of the OCSD. OCSD is responsible for the collection, treatment,aod disposal of domestic, commercial, and industrial wastewater generated by'ovcr 2.5 million people hvingand working iti the central:and northwestern County of (hangc..00SD facilities would receiv4wastewater generated froin'the: Revised Project Wastc\vatcr from,the Revised Project vronld be treated at (5CSD'sReclamatioii PlantNo. 1' liTountain Valley, Through this"facility,-OCSD successfiilly collects, conveys, Arid treats wastewater generated daily in its servicu ;area before discluirging.lhe treated water into the Pacitic.Ocean. Average.flows.for Re lamation Plant No; 1 are 130 million gallonsperday.(mgd) with a total design capacity-of320 mgd.1 The Revised Project includes the installation of a now sanitary sewerlini) that Would connect to an`er'isthig 9 -inch sairitary sewer line in;TvlacAtlhur Roulevard: The Ro iscd Project Is anticipated to result -mi a wasteviater demand of 9,61ipd from the residential uses and a reduction°in wastewater demand for'the chuech campus. The additional wastewater generated froth the additional 42 -.residential homes would be 0:005 percent of the retraining the treatment of the OCSD Reclamation Plant No; I.-Tlierefore, the increased wastewater flows from the Revised Project can be -.accommodated within the existing design capacity of Reclamation Plant -No. 1. The reforc,.the Revised Project's \bastewitter demand would be accommodated by the available' daily treatment capacity at Reclamation Plant No. 1, Reclamation Plant No, l is in compliance with the Santa Ana'Rcgional %Valetunlity Control Boards (RIVQCB's) wastewater tretitinent requtremetiis. ThcRcvised project would iiot require, nor would it result in, the construction of new wastewater lreatttjcni or collet:tion facili(ies or expinsion of;existing facilities The Certified Elli de-termitied that the Approved Prgiect's:wastewater demand would be within ` -the available. treatment capacity of the wastewater system. Therefore, the.Revised Project would notresultin new signifieant4rapaets beyond those -identified in theCcrlified EIR. No new mitigation is required. c) Refer to Response ;2, I$.d. As diseagscd.furdier in Scction'2.5, Hydrology and WatcrQuitlity, the Revised Project wCluld increase impervioivg surfaces 'areas on'lhe Project site, which would increase the volunie,of stormwatcr runoffgcnc rated from the project site. In voltmie and peak flow'o'f runoff from the site has Ilie potential to exceed the capacity of dew istream storm drain systems. Coiisequetttly,-the Revised Project would.be required to comply with the County Municipal Separate IStorm Sewer System (MS4) Permiiandhydromodification requirements, which require that post -construction runoff be reduced to a less than or equal to existing conditions. The Revised Project would also comply with Mitigation Measures HYD -1 through. HYD -3 df the Certified EIR, wliich,require,drainagc improvements to address increases in stormcvatei• runoff. opipliance with MS;t pennit and preparation of the DAMP and WQMP would reduce the Revised Project's impacts related to stnimdrain capacity lu 'i Ii S's than Orange County Sanitation DisfricL Fa(;is.and Ke)' Statiltics. hnPSCliwww.oCSd.eoM.41011le '.h w•Document?idaI0430'(accessed.September3,2017). -HS11n1 GM1AdtrixlwnSAdduulmn,tloux 409+05',17. 75B-121 2-72