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*:/ : 11-1 h WA <br />below, flood risk due to levee or dam is anticipated to be less than significant level. Raiff Street Site is not <br />in the base floodplain, which has a one percent or greater change of flooding in any given year. <br />Development of community parks would provide new draught tolerant landscaping, concrete pavers, <br />decomposed granite walking path, rubber surfaced exercise area, and rock bioswale and drywell stormwater <br />capture system to control stormwater so that the proposed project does not increase the stormwater funoff <br />volumes. The proposed project would increase the impervious surface areas by no more than 50 percent. <br />Considering the size of the proposed parks, the proposed project would not substantially alter the existing <br />drainage pattern of the site or area, or increase the rate of amount of surface runoff in a manner to cause <br />flooding. Impacts would be less than significant, and no mitigation measures are required. <br />iii) Create or contribute runoff water which would exceed the capacity of existing or planned <br />stormwater drainage systems or provide substantial additional sources of polluted runoff? <br />Less Than Significant Impact. Implementation of required BMPs during construction would ensure <br />that impacts are reduced to a less than significant level. Development of community parks would provide <br />new draught tolerant landscaping, concrete pavers, decomposed granite walking path, rubber surfaced <br />exercise area, and rock bioswale and drywell stormwater capture system to control stormwater so that the <br />proposed project does not increase the stormwater runoff volumes. The proposed project would increase <br />the impervious surface areas by no more than 50 percent and would provide rock bioswale and drywell to <br />ensure that runoff volumes from the sites do not generate significant polluted runoff Additionally, <br />considering the small size of the proposed parks, the proposed project would not substantially alter the <br />existing drainage pattern of the site of area, of increase the rate of amount of surface runoff in a manner <br />to cause flooding. Impacts would be less than significant, and no mitigation measures are required. <br />iv) Impede or redirect flood flows? <br />Less Than Significant Impact. The replacement park sites are within the FEMA FIRM flood zone X, <br />outside of a 100-year flood hazard area. Additionally, no inhabitable structures would be constructed that <br />could impede or fedirect flood flows. No impact would occur, and no mitigation measures are required. <br />d) In flood hazard, tsunami, or seiche zones, risk release of pollutants due to project inundation? <br />No Impact. A seiche is a surface wave created when a body of water is shaken, usually by earthquake activity. <br />Inundation from a seiche can occur if the wave overflows a containment wall, such as the wall of a feser von, <br />water storage tank, dam, of other artificial body of water. There are no large water tanks of dammed water <br />bodies in the area that could create flooding impacts at the project site. No significant impacts from seiche of <br />inundation due to water storage facility, lake, of feservoif failure would occur. No impact would occur, and no <br />mitigation measures are fequifed. <br />Tsunamis are large ocean waves generated by major seismic events. The project site is approximately 15 miles <br />from the Pacific Ocean. The proposed pfojectwould not expose people of structures to greater tsunami danger <br />than the existing conditions. No impact would occur, and no mitigation measures are required. <br />75C-100 <br />