31B - CUP - 1901 NORTH FAIRVIEW ST

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City of Santa Ana Environmental Checklist generate a substantial increase in runoff water that would exceed the capacity of the existing or planned stormwater drainage system. As described in Section XVII, "Utilities," the site is located within an urban and fully developed area with drainage that is directed to improved stormwater infrastructure that has been serving the largely impervious project site. As described previously, the proposed project would result in a 2% reduction in impervious surfaces on site. Furthermore, post - development drainage will consist of surface flow in the center of the project site draining into a bioretention system and surface flow along the parking areas and perimeter of the site draining into permeable pavers. Any overflow will be directed into the existing curb and gutter. Treated stormwater will discharge at four locations along North Fairview Street and join the existing drainage pattern of the street. The project will not include changes to the existing offsite drainage pattern. Therefore, the project would result in less - than- significant impacts related to the capacity of existing and planned stormwater drainage systems. f. Otlierwise substantially degrade water• quality? Less - than - Significant Impact. As described in IX.a through IX.e, the proposed project would result in less -than- significant short -term construction or long -term operational impacts on water quality. Construction impacts would be reduced through the implementation of BMPs identified in the SWPPP and as required by the regional stormwater permit and DAMP. Implementation of the project in compliance with existing regulations would result in less - than - significant impacts related to water quality. g. Place houshrg within a 100 year flood hazard area, as mapped on a federal Flood Hazard Boundary or Flood lnsm ance Rate Map or other-flood hazard delineation map? Less - than - Significant Impact. The proposed project site is not located within any type of flood zone (including a 100 -year flood hazard area) per Flood Insurance Rate Map No. 06059C0144j, December 3, 2009. Therefore, the project does not place housing within a 100 -year flood hazard area, and no impacts would occur. h. Place within a 100 year flood hazard area sia'uctures that would impede or redirect flood flows? No Impact. As discussed in 1X.g, the project site is not located within a 100 -year flood hazard area as mapped on the Flood Insurance Rate Map for the area. Further, the proposed residential development is located within a developed urban area and would not be located in an area that would impede or redirect flood flows. No impacts related to 100 -year flood hazard areas would occur with implementation of the proposed project. i, Expose people or structures to a significant risk of loss, injury, or, death involving flooding, including flooding as a result of the failure of a levee or dam? Less - than - Significant Impact. As described previously, the proposed project is not located within a flood zone, it is located within S00 feet of the Santa Ana River, which (like large portions of Santa Ana) could be inundated in the event of a significant failure of the Prado Dam that is located approximately 21 miles upstream. Flood waters from the dam could travel down the Santa Ana River toward the Pacific Ocean. In the event of a large -scale failure of the Prado Dam, flood waters would take approximately 6 hours to travel the distance to the project vicinity, approximately 7.5 The Academy Charter High School Initial Study /Mitigated Negative Declaration 3 -59 12 tCf June ne 20 2011 31 B -135