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City of Santa Ana <br />Community Plan Exemption Checklist <br />Gary Avenue Business Park Project <br />ii. Substantially increase the rate or amount of surface runoff in a manner that would result in <br />flooding on- or off -site? <br />No New Impact. Implementation of the proposed Project would include construction activities that could <br />temporarily alter the existing drainage pattern of the site and could result in flooding on- or off -site if <br />drainage is not properly controlled. However, as described previously, implementation of the proposed <br />construction requires a SWPPP, which would address site specific drainage issues related to construction <br />activities and include BMPs to eliminate the potential of flooding or alteration of a drainage pattern during <br />construction activities. <br />The Project site is currently developed, and the Preliminary Water Quality Management Plan identified that <br />it is 85 percent covered with impervious surfaces. The Project proposes to demolish the existing 3 buildings <br />and pavement and construct a new 91,500 square foot light industrial building. The Preliminary Water <br />Quality Management Plan identifies that after Project construction, the site would also be 85 percent <br />impervious. Thus, an increase of impervious surface that could result in flooding would not occur. Also, the <br />Project includes installation of a drainage system that would be required to meet the Orange County DAMP <br />requirements, as ensured through Project permitting, and would connect to the existing offsite drainage. <br />Therefore, the Project would not result in new impact related to flooding on- or off -site. <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 />No New Impact. As described in the previous response, the Project site is currently developed, and the <br />Preliminary Water Quality Management Plan (Appendix J) identified that it is 85 percent impervious. The <br />Preliminary Water Quality Management Plan identifies that after Project construction, the site would also <br />be 85 percent impervious. Thus, an increase of impervious surface that could generate additional runoff <br />would not occur. Also, the Project includes installation of a drainage system that would be required to meet <br />the Orange County DAMP requirements, as ensured through Project permitting, and would connect to the <br />existing offsite drainage. Therefore, the Project would result in no new impact related to runoff which would <br />exceed the capacity of existing or planned stormwater drainage systems. <br />iv. Impede or redirect flood flows? <br />No New Impact. The Project site does not lie within a 100- or 500- year floodplain, as delineated by FEMA. <br />The Project site is within Zone X, Area of minimal Flood Hazard. The Project would not result in alteration of <br />existing drainage (flows or capacity) that could directly or indirectly impact onsite drainages or the adjacent <br />areas. Therefore, the Project would not result a new impact related to flood flows. <br />d) In flood hazard, tsunami, or seiche zones, risk release of pollutants due to project inundation? <br />No New Impact. The Project site is not within a flood hazard zone, and flooding impacts are not anticipated. <br />Tsunamis are tidal waves generally caused by earthquakes, sea floor landslides, rock falls, and exploding <br />volcanic islands. The Project site is approximately 8 miles from the Pacific Ocean shoreline. Based on the <br />inland location of the site, the Project site is not within a tsunami zone. <br />A seiche is a wave created in a landlocked body of water (e.g., a lake or reservoir) from back -and -forth <br />movement of the water resulting from high winds or an earthquake. There are no bodies of water near the <br />Project site. Thus, impacts due to seiche would not occur. Therefore, the Project would result in no new impact <br />related to release of pollutants due to flood hazard, tsunami, or seiche zones. <br />e) Conflict with or obstruct implementation of a water quality control plan or sustainable groundwater <br />management plan? <br />70 <br />