75B - PH - AMEND ZONING 2001 W MACARTHUR

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RNYIRONVENTAL ndTAPT. xIPURT AU VYNDUN ARSISTRONO. RANCID RRYI8L0 PROJRCT. RR ITEUM Sol? SANTA. ANA, CALIFORNIA ora Storm water P.oi management practice but not be limited iii, ana retain scotmem on of"construction debris 1 1Ps)-during construction ac(i on Control and 'Sediment Cc and Good Housekeeping B waste.into receiving waters.. best - d include; leaks; and The Revised Project would be required, to obtain coverage under the Construction General Permit. The ConstructionGenertil Permit requires -prep ration of an SW11PP and implementation of construction BMPs detailed in the SWPPiI, during construction activities. Pollutants ofconcerti'during operation of the Revised Project include suspended solids/sediment, nutrients, padiugcris Nuteriahiius),'pegticides, oil andgrease,'and tmsh'and debris. The southern - portion or the Project site 15,currenily pervious; therefore, the Rev- isedl Project would increase impervious surface area wouldi increase mnoff`from the Projectsite and increase pollutant loading to -downstream receiving waters, The Revised Project would comply with the requirements Orange County Municipal Separate ;Storm Sewer System (NI84) Permit and Drainage Area Managementrplan (DAMP). A Nater Quality Managyment Plan (NN•QMP) would be prcpumd for the Revise-a'Project consistent with the requirements of the Model WMP and Technical Guidance Document: The WQMP would si cciry the Site Design, Sourec Control;.and Low impact Developmenc,,(LID) BMPs tliat would be impletnented totargcl pollutants ofconeern'in "runoff from the Project site to reduce impacts to water quality during•operation. With implementation and maintenance ofpost-construction BiAr's that target pollutants of concern in stormwnterrmof, ,, and compliance with the requirements'of the MS4 Permit, operational impacts related to waste discharge requirement and water quality "standards would be less than significant:. In summary; with implementation of Mitigation Measures GEO 5: and GEO-G, water quality impacts of the Revised Project would be reduced to a less than significant level. 'The Certified LIR also concluded that Mitigation'Mleasures GEO-5'and 080-6 would reduee water quality to a less than significant level. Therefore, the lterased Project would not result hi new,significant impacts,heyond those identified in the Certified SIR. No new mitigation measures are required. b) Groundwater on the Project site was oneomitered'at depths ranging from 13 to 2'7 feel below ground surfice;(bgs) dluringboring-conducted as part of theTreliminary Geotechnical Investigation Report.p'repared forthc Certified EIR. Thertfon%, it is unlikely that groundwater' would be cii"comntercd during construction of the Revised Project and groundwater dewatering would not be required. The Revised Pnijectwould not require biround wafer extraction during operation, TheRevised.Projcet would increase impervious surface area on the Project site which would decrease infiltration. However, on-site soils have low,pemnuability and are not conducive to infiltrationor groundwater recharge in the existing condition: Therefore, the increas .in impervious surface area would not.substmrtially alter fnoundwatcrrecharge, in addition, the Project site is: not in a groundwater recharge area. For ihpse rcasons; impacts related to depletion of groundwater Rupp lies or interference with groundhvater re6argedunng conslrgotion operation of the ApprovedErojecr mould hc_ Ie9s than signiGoanl Anil no.iriitigation is required, The Certified 1 IR also concluded that the Approved Project would haw a less than signifwant impact ED groundwafer supplies and recharge. Therefore, the Revised Project would noCresult in new significant impacts beyond thoseidd'ntified in the Ccriifiui ETR. No new mitigation measures are required. p;5911016,,(,4'' NddendiimlAddundum,ducx QWUS.47u 75B-93 z-44