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O NE B RO A D WA Y P LA Z A P RO J E CT E I R A D DE N DU M CI T Y O F S A NT A A NA 5. Environmental Analysis March 2020 Page 63 Environmental Issues Substantial Change in Project Requiring Major EIR Revisions Substantial Change in Circum-stances Requiring Major EIR Revisions New Information Showing New or Increased Significant Effects Less Than Significant Impact/No Changes or New Information Requiring Preparation of an EIR No Impact e) Conflict with or obstruct implementation of a water quality control plan or sustainable groundwater management plan? x Comments: a) Violate any water quality standards or waste discharge requirements or otherwise substantially degrade surface or ground water quality? Less Than Significant Impact/No Changes or New Information Requiring Preparation of an EIR. The Certified EIR determined that construction and operation of the Approved Project may generate surface runoff with pollutants that could impact area receiving waters. The Approved Project would be required to prepare a SWPPP, WQMP, and NPDES permit. Construction and operation of the Proposed Project would comply with the SWPPP, WQMP, and NPDES permit for the Approved Project. The Proposed Project would not increase development floor area nor impervious surfaces. The Proposed Project would comply with identified mitigation measures. As such, the Proposed Project would not create a new significant impact or a substantial increase in the severity of previously identified e ffects and would not require the preparation of a subsequent EIR. The Certified EIR (Geology and Soils section) identifies Mitigation Measure G -5 to address the intrusion of the Approved Project’s foundation piles into the groundwater. Mitigation Measure G -5 would ensure that the Approved Project’s foundation piles would result in a less than significant impact regarding the introduction of contaminants into the groundwater. The Proposed Project would comply with all identified mitigation measures. b) Substantially decrease groundwater supplies or interfere substantially with groundwa ter recharge such that the project may impede sustainable groundwater management of the basin? Less Than Significant Impact/No Changes or New Information Requiring Preparation of a n EIR. The Proposed Project would not expand the approved building square footage nor increase impervious surfaces. As such implementation of the Proposed Project would not decrease groundwater supplies or interfere with groundwater recharge. The Proposed Project would not create a new significant impact nor a substantial increase in the severity of previously identified effects that would require the preparation of a subsequent EIR. c) Substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river or through the addition of impervious surfaces, in a manner which would: (i) result in a substantial erosion or siltation on- or off-site; (ii) substantially increase the 5 - 117