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Grand Avenue Widening Project Environmentallmpact Report Section 2.0 There are no unique geological or physical features on or adjacent to the project segment of Grand Avenue because this area is basically flat. Therefore, the project will not result in or expose people to potential impacts involving unique geologic or physical features. No mitigation is required. Mitigation Measure G-1. The project specifications shall require the construction contractor to place desiltation devices such as sandbags in areas along the project alignment, during any grading and/or construction during rainy periods, to eliminate discharge of soil laden waters from the construction area onto other City streets or into storm drains. Mitigation Measure G-2. Although the area is relatively flat and is expected to be flat after grading and prior to paving the road, during watering for dust control during construction, the project specifications shall require the construction contractor to ensure that silt laden water does not run off the construction area onto City streets, private property or into storm drains. If the temporary conditions during grading result in flows of water from the construction area, desiltation devices shall be placed at appropriate areas to eliminate discharge of soil laden waters from the construction area. Mitigation Measure G-3. During all grading and construction, the project specifications shall require the construction contractor to control fugitive dust by regular watering and/or other appropriate measures to comply with South Coast Air Quality Management District (AQMD) Rule 403. Mitigation Measure G-4. The project specifications shall require that, during the period between grading and paving, the use of graded, unpaved areas by construction vehicles and other traffic be avoided to the extent feasible. Where avoidance of these areas is not possible, the following measures shall be incorporated, as appropriate: regular watering, covering of driveway accessways and other similar measures to avoid unnecessary dust generation. 2.5 WATER IMPACTS FOUND NOT TO BE SIGNIFICANT The proposed widening of the project segment of Grand Avenue will result in an incremental increase in impervious surfaces in this area and a slight increase in the amount of runoff from the road surface to the nearest storm drains. However, these increases are not expected to be significant because the area is already predominantly developed in urban uses. Therefore, the proposed project is not expected to result in significant changes in absorption, drainage patterns or the rate and amount of surface runoff. No mitigation is required. Because the project segment of Grand Avenue is outside the defined 100 and 500 year flood zones, and the standard project flood (SPF) zone, the proposed widening project is not anticipated to result in the exposure of people or property to flooding. The widening of Grand Avenue is expected to incrementally improve existing drainage in the area and, therefore, will reduce the potential for rain water to extend beyond the road right-of-way during major storm events. Therefore, the proposed project is not anticipated to result in significant adverse impacts related to flooding. No mitigation is required. F.9PROJ-ENMGrand eirWew Text - GrandiSection 2.0-new.doc Page 2-3