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4.7 BIOLOGICAL RESOURCES Mitigation Measures 4.7-3(a) Preserve the entire South Tracy Lake system in its present, unmodified state. 4.7-3(b) End the current practice of periodically tilling the drying portions of lake basin so that aggressive pioneer weeds may then invade the entire area. 4.7-3(c) Retain a waterfowl management specialist to design and supervise the planting and management of a plant compliment in the shallow zone of South Tracy lake which produces an annual seed crop for invading rodent populations in summer and migrant water birds in winter and spring. The management plan should also include specifications for the planting of visual tree screens in the northwest shoreline portion of South Tracy Lake to protect against visual disturbancefrom the future developedarea. (Refer to mitigation measure 4.7-1(a).) One additional aspect of the plan should be the design of several water bird viewing blinds from which the lake can be approached from a safe "disturbance distance" but still permit viewing of its rich water bird complement. 4.7-3(d) Retain a hydrologist to design a dry year summer water maintenance program for South Tracy Lake. Sources of water for such a program would presumably be the North Tracy Lake reservoir or wells. The plan should be designed to insure that center lake water levels never drop below a minimum offive feet throughout the nesting and young rearing period(May through August). Based on observations during the 1992 study period, such a maintenance program would not be needed during near normal or above normal rainfall years. 4.7-3(e) Restrict all human activity in the area of South Tracy Lake during the Central Valley waterfowl wintering season (November through April). Once nesting birds are established on sequestered nest sites in May, limited use of hiking trails set back as far from the lake shore as possible may be possible. The final determination on this point should be included in the waterfowl management plan. All precautions concerning human disturbance should be extended to the Beaver Pond habitat as well. 4.7-30 Place a conservation easement over the entire South Tracy Lake area andBrovelli Woods to be retained as permanent open space. Impact 4.7-4 Development would cause potential injury or destruction of native trees through root and limb damage during and after project construction. 4.7-32