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

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and Water City of Santa Ana -Park View at Town and Country Manor Draft EIR i.) Expose people or structures to a significant risk of loss, injury or death involving flooding, including flooding as a result of the failure of a levee or dam? j.) Inundation by seiche, tsunami, or mudflow? 4.3.5 - Impact Analysis and Mitigation Measures This section discusses potential hydrology and water quality impacts associated with the development of the project. Mitigation measures are provided where necessary. Water Quality Standards and Requirements Impact 4.3 -1 The project would not violate any water quality standards or waste discharge requirements. The project would not otherwise substantially degrade water quality. [CEQA Hydrology and Water Quality Threshold 8(a)] [CEQA Hydrology and Water Quality Threshold 8(f)] Impact Analysis Construction Phase The construction and grading phases of the project would require temporary disturbance of surface soils and removal of existing landscaping. During the construction period, grading and excavation activities would result in exposure of soil to storm runoff, potentially causing erosion and sediment in the runoff. Stockpiles and excavated portions on the project site would be exposed to runoff and, if not managed properly, the runoff could cause erosion and increased sedimentation in local and regional drainage ways. By volume, sediment is the principal component in most storm runoff. Sediments also transport substances such as nutrients, hydrocarbons, and trace metals, which are conveyed to the receiving waters. The potential for chemical releases is present at most construction sites in the form of fuels, solvents, glues, paints, and other building construction materials. Once released, these types of substances could be transported to nearby surface waterways and/or to groundwater in storm water runoff, wash water, and dust control water, potentially reducing the quality of the receiving waters. Construction sites greater than one acre in size are regulated under the state's General Permit for Construction Activities. This permit requires the discharger to eliminate or minimize sediments and other pollutants from discharging into storm water runoff from their construction sites through appropriate Best Management Practices (BMPs) implemented during and after construction. The project also requires the preparation of a SWPPP for construction discharges for submittal to the City for review and approval prior to construction. The project proposes to address water quality during both the construction phase and the post - construction phase through the use of BMPs. During construction, BMPs would be utilized to reduce sediment generated by erosion and construction waste discharge associated with ground disturbing activities and construction of improvements. Typical BMPs include storm drain inlet protection, gravel bag dikes, and silt fencing. These BMPs 4.3 -6 Michael Brandman Associates H\Cl t (PN JN)b327b327W3MME 3270030 Sec 3Hyd bUadWat Wity.d