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ONE BROADWAY PLAZA PROJECT EIR ADDENDUM <br />CITY OF SANTA ANA <br />5. Environmental Analysis <br />Less Than <br />Significant <br />Substantial <br />Impact/No <br />Substantial <br />Change in <br />New <br />Changes or <br />Change in <br />Circum- <br />Information <br />New <br />Project <br />stances <br />Showing New <br />Information <br />Requiring <br />Requiring <br />or Increased <br />Requiring <br />Major EIR <br />Major EIR <br />Significant <br />Preparation of <br />Environmental Issues <br />Revisions <br />Revisions <br />Effects <br />an EIR <br />No Impact <br />e) Conflict with or obstruct implementation of a <br />water quality control plan or sustainable <br />X <br />groundwater management plan? <br />Comments: <br />a) Violate any water quality standards or waste discharge requirements or otherwise substantially <br />degrade surface or ground water quality? <br />Less Than Significant Impact/No Changes or New Information Requiring Preparation of an EIR. <br />The Certified EIR determined that construction and operation of the Approved Project may generate surface <br />runoff with pollutants that could impact area receiving waters. The Approved Project would be required to <br />prepare a SWPPP, WQMP, and NPDES permit. Construction and operation of the Proposed Project would <br />comply with the SWPPP, WQMP, and NPDES permit for the Approved Project. The Proposed Project would <br />not increase development floor area nor impervious surfaces. The Proposed Project would comply with <br />identified mitigation measures. As such, the Proposed Project would not create a new significant impact or a <br />substantial increase in the severity of previously identified effects and would not require the preparation of a <br />subsequent EIR. <br />The Certified EIR (Geology and Soils section) identifies Mitigation Measure G-5 to address the intrusion of <br />the Approved Project's foundation piles into the groundwater. Mitigation Measure G-5 would ensure that the <br />Approved Project's foundation piles would result in a less than significant impact regarding the introduction of <br />contaminants into the groundwater. The Proposed Project would comply with all identified mitigation <br />measures. <br />b) Substantially decrease groundwater supplies or interfere substantially with groundwater recharge <br />such that the project may impede sustainable groundwater management of the basin? <br />Less Than Significant Impact/No Changes or New Information Requiring Preparation of an EIR. <br />The Proposed Project would not expand the approved building square footage nor increase impervious <br />surfaces. As such implementation of the Proposed Project would not decrease groundwater supplies or <br />interfere with groundwater recharge. The Proposed Project would not create a new significant impact nor a <br />substantial increase in the severity of previously identified effects that would require the preparation of a <br />subsequent EIR. <br />c) Substantially alter the existing drainage pattern of the site or area, including through the alteration <br />of the course of a stream or river or through the addition of impervious surfaces, in a manner which <br />would: (i) result in a substantial erosion or siltation on- or off -site; (ii) substantially increase the <br />Apri12020 Page 63 <br />