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Community Plan Exemption Checklist <br />City of Santa Ana Gary Avenue Business Park Project <br />Summary of Impacts Identified in the GPU EIR <br />The Final Recirculated GPU EIR addressed hydrology and water quality impacts on pages 5.9-29 through <br />5.9-38. The GPU EIR discussed that projects pursuant to the GPU would not violate any water quality <br />standards or waste discharge requirements or otherwise substantially degrade surface or groundwater <br />quality. Development pursuant to the GPU would increase the demand on groundwater use but would not <br />impede sustainable groundwater management of the basin. Development pursuant to the GPU would <br />increase the amount of pervious surfaces in the plan area, but could substantially increase the rate or amount <br />of surface runoff in some focus areas in a manner which would result in flooding off -site or contribute runoff <br />water that would exceed the capacity of existing or planned stormwater drainage systems. In flood hazard, <br />tsunami, or seiche zones, development pursuant to the GPU would not risk release of pollutants due to project <br />inundation or impede or redirect flood flows. In addition, the EIR determined that development pursuant to <br />the GPU would not conflict with or obstruct implementation of a water quality control plan or sustainable <br />groundwater management plan. <br />Impacts Associated with the Proposed Project <br />a) Violate any water quality standards or waste discharge requirements or otherwise substantially <br />degrade surface or groundwater quality? <br />No New Impact. <br />Construction <br />Implementation of the proposed Project includes grading, site preparation, construction of new building, and <br />infrastructure improvements. These activities would expose and loosen sediment and building materials, which <br />would have the potential to mix with stormwater and urban runoff and degrade surface and receiving water <br />quality. Additionally, construction generally requires the use of heavy equipment and construction -related <br />materials and chemicals, such as concrete, cement, asphalt, fuels, oils, antifreeze, transmission fluid, grease, <br />solvents, and paints. In the absence of proper controls, these potentially harmful materials could be <br />accidentally spilled or improperly disposed of during construction activities and could wash into and pollute <br />surface waters or groundwater, resulting in a significant impact to water quality. <br />Pollutants of concern during construction activities generally include sediments, trash, petroleum products, <br />concrete waste (dry and wet), sanitary waste, and chemicals. Each of these pollutants on its own or in <br />combination with other pollutants can have a detrimental effect on water quality. In addition, chemicals, <br />liquid products, petroleum products (such as paints, solvents, and fuels), and concrete -related waste may be <br />spilled or leaked during construction, which would have the potential to be transported via storm runoff into <br />nearby receiving waters and eventually may affect surface or groundwater quality. During construction <br />activities, excavated soil would be exposed, thereby increasing the potential for soil erosion and <br />sedimentation to occur compared to existing conditions. In addition, during construction, vehicles and <br />equipment are prone to tracking soil and/or spoil from work areas to paved roadways, which is another <br />form of erosion that could affect water quality. <br />However, the use of BMPs during construction implemented as part of a SWPPP as required by the National <br />Pollution Discharge Elimination System (NPDES) General Construction Permit (and Municipal Code Section <br />18-156) would ensure that Project impacts related to construction activities resulting in a degradation of <br />water quality would be less than significant. Furthermore, an Erosion and Sediment Transport Control Plan <br />prepared by a qualified SWPPP developer (QSD) is required to be included in the SWPPP for the Project. <br />Therefore, compliance with the Statewide General Construction Activity Stormwater Permit requirements, <br />and the City's Municipal Code, which would be verified during the City's construction permitting process, <br />would ensure that Project impacts related to construction activities resulting in a degradation of water quality <br />would not occur. <br />68 <br />