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4 _ <br /> 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 />C. 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.t - <br />C. <br /> 5.3.2 Impacts <br />It <br /> Project Impacts <br /> Since the site is almost completely covered with development <br /> at the present time, the proposed project is not anticipated to result <br />C <br /> in a significant amount of additional runoff. The existing drainage <br /> facilities that serve the site should be adequate to accoimnodate the <br />CI 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 /> process. <br />L <br /> Cumulative Proposed Impacts <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 /> 61