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Mitigation Measure. None is required. Impact 2 - Impacts to Water Quality as Related to Birds If the proposed retention pond (projected to cover about 1.8 acres) attracts waterfowl , the birds could be negatively impacted by chemicals in runoff from the site. This runoff would be concentrated by evapora- tion vapora- tion in the pond. These birds may also be a hazard to aircraft at the nearby Stockton Municipal Airport whose air rights extend over the east- ern portion of the site. Additional discussion of the retention pond is contained in the Public Services and Utilities section and Hydrology and Water Quality section of this chapter. Mitigation Measure. Should the retention pond prove to attract significant numbers of waterfowl , it is recommended that the pond be re- designed to prevent use by birds (e.g. made deeper and smaller) or replaced with a facility that accomplishes the purpose of the pond with- out attracting birds. A containment berm around the waste oil recovery area, a five foot wide drainage ditch around the site and a retention pond to evaporate site runoff are expected to prevent any pollutants from reaching Weber Slough. No other mitigation measures would be needed to protect Weber Slough. Impact 3 - Proposed Landscaping The western and northern boundaries and northeast corner of the proposed development would be planted with eucalyptus to provide a visual screen. Although wildlife use of eucalyptus is limited, these trees would (when mature) have a positive impact on habitat by providing nest sites for raptors and other birds. Mitigation Measure. Climate conditions limit the choice of trees that could be planted for screening. Mr. Gary Hickman of the Stockton Office of the Cooperative Extension Service, recommended Eucalyptus camaldulensis, a fast growing species with many branches. These trees must be watered during the first year after planting to assure survival . 3-81 104-7.R4 4/11/89 4