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Statement of Fact This impact will be reduced by the following: The Department of Aviation shall develop and implement a comprehensive drainage plan as part of the Special Purpose Plan to ensure that changes in runoff on the project site as a result of development do not increase peak flow rates exiting the airport property. All improvements or modifications to drainage systems shall be designed and constructed according to San Joaquin County Department of Public Works standards. The comprehensive drainage plan shall be reviewed and approved by the Department of Public Works before grading permits are issued. Any modifications to facilities located within the Stockton city limits shall comply with the City's Storm Water Management Plan. A-2 Potentially Significant Impact: Increased Flight Safety Hazard (Impact QW-2) Detention basins for storm water runoff within the flight line area of the airport property may pose a flight safety hazard as a result of the attraction of waterfowl to the basins and ponds. Birds landing and taking off from detention basins pose a threat to aircraft using the airport runway. The detention basins included in the drainage study located between the runways have been designed to hold water during storm events for short periods of time. The detention ponds at the north end of the runway are expected to have water in them for approximately 240 hours during a 100-year storm. Because the ponds have been designed to hold water for a relatively short period of time, it is expected that birds would not be greatly attracted to them. Also, the high noise levels associated with the airport runway will help to deter birds from entering the area. Findin Changes or alterations have been required in, or incorporated into, the project which avoid or substantially lessen the significant environmental effect as identified in the EIR. Statement of Fact This impact will be reduced by the following: • The detention basins have been designed to minimize the period of time that water will be standing. After construction of the basins,the Department of Aviation shall evaluate the degree to which waterfowl are attracted to the detention basins. If necessary, measures will be incorporated into the design and operation of the detention basins to make them less attractive to waterfowl. Potential measures include the use of cables or netting stretches across the basin surface that would restrict bird landings and takeoffs, and hazing measures, such as automated noise generators. A-3 Potentially Significant lm act: Tem ora Increases in Construction Related Soil Erosion During project construction, construction activities could discharge eroded soil, petroleum products, concrete, and other construction wastes into local drainage channels. Soil and associated contaminants that enter drainage channels can increase turbidity, stimulate the growth of algae, increase sedimentation of aquatic habitat, and introduce compounds toxic to San Joaquin County ER-96-1, et al\Stockton Airport Community Development Page 26