2014-028 - Approving General Plan Amendement No. 2014-01

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City of Santa Ana - Park View at Town and Country Manor Draft OR Impact Analysis and The project vicinity is developed primarily with urban uses that have impermeable surfaces. To minimize runoff and promote onsite storage and treatment, the proposed project has been designed to minimize impervious areas. Additionally, the landscaped strips and swales and underground infiltration trench to be constructed as part of the proposed project will allow collected flows to permeate underground. Due to the sufficiency of the City's water supplies (addressed in Section 4.7 Utilities and Service Systems), satisfying the water demands of the proposed project will not substantially deplete groundwater supplies. The project will not substantially interfere with groundwater recharge. The impact is less than significant. Level of Significance Before Mitigation Less than significant. Mitigation Measures No mitigation measures required. Level of Significance After Mitigation Less than significant. Drainage Pattern: Erosion or Siltation and Flooding Impact 4.3 -3 The project would not substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river, in a manner which would result in substantial erosion or siltation on- or off -site. The project would not substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river, or substantially increase the rate or amount of surface runoff in a manner which would result in flooding on- or off -site. [CEQA Hydrology and Water Quality Threshold 8(c)] [CEQA Hydrology and Water Quality Threshold 8(d)] Impact Analysis The proposed project will increase the amount of impermeable surfaces within the project site, and will result in an increase in runoff compared to existing conditions, estimated at 1.5 cfs of additional flow (Hall and Foreman 2009). A project Hydrology Study as well as a Drainage Plan, identifying the exact size and location of drainage facilities, will be prepared and submitted to the City of Santa Ana for review and approval. City and regional requirements would ensure proper conveyance and discharge of runoff. All onsite drainage facilities would be privately owned and maintained. In the event that the property is transferred to a new owner, the new owner would assume all responsibility for the maintenance of the onsite drainage facilities specified in the Preliminary WQMP. While project implementation would result in changes to the existing drainage system, the new improvements would not substantially alter the course of a stream or river. Furthermore, no Michael Brandman Associates 4.3 -9 H\Cl t (PN JN)b327b327W3MME 3270030 Sec 3Hyd bUadWat Wity.d¢