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GEO-6 Erosion control practices shall be employed and maintained on all vacant areas on the project site that have been graded. Findings for Impact GEO-3. The City finds that the above-identified changes or alterations would reduce the impact identified as GEO-3 to less than significant levels and are herby incorporated into the project. No additional mitigation measures are necessary with the implementation of Mitigation Measures GEO-5 and GEO-6. Hydrology/Water O, yalit), Impact HYD-1. Construction activities would result in runoff that would potentially affect water quality. Implementation of the proposed project would result in land disturbing activities such as grading and excavation to develop residential dwelling units and a church facility. These types of construction activities could accelerate the erosion process by loosening the soil, increasing the gradient of land slopes, and altering natural surface runoff patterns. Such changes may increase the erosion rate from the natural rate that existed before the construction activity began. However, it should be noted that the project site currently consists of level-graded agricultural land with limited vegetation. Therefore, the total erosion from the project site after development would be decreased due to the reduction in the area of exposed soft on site. Mitigation Measure for Impact HYD-1. HYD- 1 All proposed drainage improvements, including project catch basins, shall be designed and constructed in accordance with the standards set by the City of Santa Ana and by the Orange County Flood Control District. Plans for grading, drainage, and erosion control shall be reviewed by the City Engineer prior to issuance of grading permits. Findings for Impact HYD-1. The City finds that. the above-identified changes or alterations would reduce the impact identified as HYD-1 to less than significant levels and are herby incorporated into the project. No additional mitigation measures are necessary with the implementation of Mitigation Measure HYD- 1. Impact HYD-2. Implementation of the proposed project would modify local drainage patterns through the addition of contiguous areas of impervious surfaces. Additional impervious surfaces would include the driveways for residences, parking lot for the church, and 156 residential dwelling units. Development of the project site as currently planned and as depicted on the Conceptual Drainage Plan is consistent with the City's Master Plan of Drainage and with drainage 13