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Changes or alterations have been required in, or incorporated into, the project which avoid or substantially lessen the significant environmental effect identified in the Final EIR. Facts in Support of the Finding The local storm drain system will have to be upgraded in order for the increased amount of runoff from the site to be adequately carried by the local system. Potential impacts to the local storm drain system can be reduced to a less than significant level through the implementation of the following mitigation measure: Prior to the issuance of a building permit, the applicant shall construct a 48-inch main line storm drain connecting to Orange County Flood Control District's (OCFCD) Southwest Tustin Channel (Facility F11) consistent with the City of Santa Ana's Master Plan of Drainage. The applicant shall connect to the new 48-inch line with a new 24-inch storm drain lateral from the project site. Significant Effect During construction, portions of the site could be exposed to elements which could cause erosion. Changes or alterations have been required in, or incorporated into, the project which avoid or substantially lessen the significant environmental effect identified in the Final EIR. Facts in Support of the Findin_~ The grading activities associated with the construction of the project will result in soil erosion and surface water runoffimpacts. The following mitigation measures will minimize hydrology impacts: Prior to issuance of Certificate of Occupancy to Orchard Supply Hardware, those pads and portions of the site not being developed shall be provided interim landscaping as follows to the satisfaction of the City to minimize dust generation: Retail Buildings 2 and 3 and Pads A and B-turf grass; open space areas, including proposed parking lots- wildflower mix. The interim landscaping plan shall be approved by the City of Santa Ana Case Planner and the Landscape Development Associate and be consistent with the Building Division's set of working drawings (including grading plans prepared by the civil engineer). During periods of rainfall or whenever water is used on-site during project grading or construction, all runoff shall be diverted from areas exposed to construction through the use ofberms (sand bags), or other such devices, to minimize stormwater contamination and prevent sediment-filled runoff from being deposited in City or County storm drains. 8