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and Water <br />City of Santa Ana -Park View at Town and Country Manor <br />Draft EIR <br />substantial erosion, siltation, or flooding on or offsite would occur with project implementation. <br />Impacts to the drainage pattern are considered less than significant. <br />Level of Significance Before Mitigation <br />Less than significant. <br />Mitigation Measures <br />No mitigation measures required. <br />Level of Significance After Mitigation <br />Less than significant. <br />Runoff Water and Drainage Systems <br />Impact 4.3-4 The project would not create or contribute runoff water which would exceed the <br />capacity of existing or planned stormwater drainage systems or provide substantial <br />additional sources of polluted runoff. <br />[CEQA Hydrology and Water Quality Threshold 8(e)] <br />Impact Analysis <br />See analysis for Impact 4.5 -1. Existing drainage facilities serving the Town and Country Manor and <br />surrounding area have been planned and constructed to accommodate runoff from development on the <br />project site. A project Hydrology Study as well as a Drainage Plan, identifying the exact size and <br />location of drainage facilities, will be prepared and submitted to the City of Santa Ana for review and <br />approval. The proposed project can be considered part of the master planned mixed use area <br />containing the Main Place Mall and City Place development. Development intensity in this location <br />is increasing, and storm drain facilities are being upgraded accordingly. Increased runoff volumes <br />and velocities for the project site will be reduced through BMPs discussed in Impact 4.5 -1 and <br />detailed in the project Preliminary WQMP contained in Appendix C. Runoff will be stored and <br />treated prior to discharge from the project site. Impacts of runoff water on drainage systems and <br />water quality are considered less than significant. <br />Level of Significance Before Mitigation <br />Less than significant. <br />Mitigation Measures <br />No mitigation measures required. <br />Level of Significance After Mitigation <br />Less than significant. <br />4.3 -10 Michael Brandman Associates <br />H\Cl t (PN JN)b327b327W3MME 3270030 Sec 3Hyd bUadWat Wity.d <br />