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5'i: RTH".1 Finding: Less than significant impact. (DEIR, p. 2-7; Initial Study, p. 42.) Facts in Support of Finding: The Project site does not include a stream, river, creek, or other water body. The closest water body is the Santiago Creek, which is located approximately 130 feet to the north of the site within Santiago Park, and would not be disturbed by the Project. The Project site is largely impervious, as it is generally covered by pavement or the building structure. Redevelopment of the site would provide for a similar amount of impervious surface; thus, the rate or amount of surface runoff would not substantially increase with implementation of the Project. In addition, the Project includes redevelopment of the existing onsite drainage system to provide infiltration basins, storm drains, and catch basins that would retain and filter runoff prior to discharge into the existing storm drains in N. Main Street and Edgewood Road. Thus, the Project would not substantially alter the existing drainage pattern on the site or in the area, or substantially increase the rate or amount of runoff that could result in flooding. For the foregoing reasons and the reasons discussed in the DEIR and the Initial Study, impacts associated with this issue would be less than significant, and no mitigation is required. (Initial Study, pp. 41-42.) 9.9.5 Water Runoff Threshold: Would the Project create or contribute runoff water which would exceed the capacity of existing or planned stormwater drainage systems or provide substantial additional sources of polluted runoff? Finding: Less than significant impact. (DEIR, p. 2-7; Initial Study, pp. 42-43.) Facts in Support of Finding: As discussed above, the Project site is largely impervious, and redevelopment of the site would not substantially increase impervious areas, such that an increase in runoff would occur. In addition, the Project would redevelop the existing onsite storm water drainage system, which would convey runoff from buildings and paved areas to infiltration basins, storm drains, and catch basins that would retain and filter storm water prior to discharge into the existing storm drains in N. Main Street and Edgewood Road. Overall, redevelopment of the Project site would not result in an increase in runoff that would exceed the capacity of the existing City storm drain system. For the foregoing reasons and the reasons discussed in the DEIR and the Initial Study, impacts associated with this issue would be less than significant, and no mitigation is required. (Initial Study, pp. 41-42.) 9.9.6 Degradation of Water Quality Threshold: Would the Project otherwise substantially degrade water quality? Finding: Less than significant impact. (DEIR, p. 2-7; Initial Study, pp. 40-43.) Facts in Support of Finding: For the reasons discussed above and the reasons discussed in the DEIR and the Initial Study, the Project would not otherwise substantially degrade water quality. (Initial Study, pp. 41-42.) 9.9.7 Flood Hazard Area Zones Threshold: Would the Project place housing within a 100 -year flood hazard area as mapped on a federal Flood Hazard Boundary or Flood Insurance Rate Map or other flood hazard delineation map? Resolution No. Certification of the Magnolia at the Park EIR 75E-73 Page 35 of 71