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5.3 Hydrology <br />5.3.1 Environmental Setting <br />The project site is basically flat and almost entirely covered <br />with buildings and parking lots. Runoff from the site drains in a <br />southwesterly direction to a 36-inch storm drain in Arnett Drive. <br />Runoff from the storm drain in Arnett Drive discharges into Santiago <br />Creek. There is also a 42-inch storm drain in Main Street that <br />collected some runoff from the site which also discharges into Santiago <br />Creek. The runoff generated from the northwest portion of Fashion <br />Square drains into an open channel located within the freeway right-of- <br />way (CALTRANS' property) and empties into the Santa Ana River.* <br />U; <br />5.3.2 Impacts <br />Project Ympacts <br />Since the site is almost completely covered with development <br />at the present time, the proposed project is not anticipated to result <br />in a significant amount of additional runoff. The existing drainage <br />facilities that serve the site should be adequate to accommodate the <br />`1 additional runoff generated by the project. Any improvements which do <br />prove to be necessary will be required to be made at the time of <br />construction pursuant to the City's standard building permit approval <br />I process. <br />Cumulative Proposed Impacts <br />s <br />G <br />The proposed project in conjunction with other developments in <br />the area would result in an increase in the amount of stormwater runoff. <br />The additional increase in runoff generated by the cumulative projects <br />* John Burk, Senior Civil Engineer, City of Santa Ana, Public Works. <br />75D-At <br />