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Vista Charter Public Schools District Office and Outdoor Space Project
<br />CEQA Exemption 15183
<br />with RR HYD-5 would ensure adherence to Municipal Code Chapter 18 Article IV regarding
<br />prohibitions on illicit connections and discharges, urban runoff control measures, and permit
<br />requirements. As a result, water quality impacts associated with construction activities would be
<br />less than significant.
<br />As the project would introduce new uses (i.e., office and outdoor areas) to the project site,
<br />development of a WQMP consistent with the prevailing terms and conditions of the City's LIP,
<br />Orange County Drainage Area Management Plan and NPDES MS4 Permit from the Santa Ana
<br />Regional Water Quality Control Board, i.e., RR HYD-4, and the City's Model WQMP would be
<br />required. The WQMP would include LID/site design and project -specific BMPs to ensure water
<br />quality standards or waste discharge requirements are not violated, and to prevent substantial
<br />erosion or siltation on- or offsite. Further, existing drainage facilities within the public right-of-way
<br />(i.e., West 5th Street and North Fairview Street) would be maintained. Therefore, with compliance
<br />to existing regulations to control construction stormwater runoff during operation, impacts related
<br />to water quality standards, waste discharge requirements, and storm water drainage would be
<br />less than significant, consistent with the General Plan Update.
<br />Given the proposed uses, the project would not result in substantial population growth within
<br />Santa Ana. According to the GPU EIR, projected water demand from the proposed General Plan
<br />Update at buildout, including development of the proposed project, is well within the projected
<br />total water demand for 2040 in the City of Santa Ana 2015 Urban Water Management Plan for
<br />normal, dry year, and multiple dry year scenarios. Additionally, because the project site was
<br />formerly occupied by automotive repair businesses and associated parking area, development of
<br />the proposed project would not interfere with groundwater recharge. Therefore, consistent with
<br />the General Plan Update, the proposed project would result in less than significant impacts related
<br />to groundwater.
<br />The GPU EIR determined that sites within the West Santa Ana Boulevard Focus Area that would
<br />be updated from single-family to multi -family residential use would become areas with increased
<br />impervious surfaces, and as a consequence, areas of increased stormwater runoff peak flows
<br />compared to pre -project conditions. The proposed project would renovate an existing building,
<br />formerly occupied by automobile repair businesses, into an office building; no change in density
<br />is proposed and the building footprint would not change from existing conditions. Additionally, the
<br />project proposes new landscaped areas, including a community garden, play field, and play yard,
<br />where paved surface parking currently exists. As such, the project would reduce the amount of
<br />impervious areas on the project site compared to existing conditions.
<br />According to Figure 5.9-4, City of Santa Ana Flood Zones, of the GPU EIR, the project site is not
<br />within a 100-year flood hazard area as designated by the Federal Emergency Management
<br />Agency (FEMA). According to Figure 5.9-5, Dam Inundation Areas, of the GPU EIR, the project
<br />site is within both the Santiago Creek Dam and Prado Dam inundation areas. However, the
<br />Santiago Creek Dam has been assessed by the California Division of Safety of Dams (DSOD) to
<br />have no existing or potential dam safety deficiencies and the U.S. Army Corps of Engineers' Dam
<br />Safety Program is actively implementing risk -reduction measures to remediate the Prado Dam,
<br />including routine inspections and ongoing monitoring, spillway modifications to improve
<br />downstream flow, and public outreach, to ensure potential inundation hazards are minimized or
<br />eliminated.21 The GPU EIR determined that seiche occurrence is lower within inundation zones,
<br />21 U.S. Army Corps of Engineers, Corps reclassifies Prado Damn, implements risk -reduction measures,
<br />https://www.spl.usace.army. mil/Media/News-Releases/Article/1849301 /corps-reclassifies-prado-dam-implements-
<br />risk-reduction-measures/, May 15, 2019.
<br />Dec I y ouncil 26 — 97 1/16/202 e 37
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