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El The planting palette is composed of species common to riparian habitats in the Central Valley. The species mix in the creekside zone is typically found in the portion of the floodplain that is frequently inundated during the high-water season. The species mix in the cottonwood -willow zone is typically found in the portion of the floodplain that is regularly flooded, but for shorter durations than in the creekside zone. The species mix in the oak -woodland is typically found in the portion of the floodplain that is rarely flooded. Plantings in the creekside and cottonwood -willow zones will be spaced 15 feet apart, and plantings in the oak -woodland will be spaced 20 feet apart. The 290 valley oak trees that will be planted would mitigate the loss of the eight valley oak trees along the existing creek that may be affected by the landfill expansion. Irrigation System for Mitigation Planting The use of a temporary irrigation system to encourage successful plant establishment is a proven approach for revegetation/mingation projects. Irrigation should be applied using an automatic system with a combination of overhead -spray sprinklers and drip irrigation techniques to provide the plants with a source of clear, nontoxic water and adequate moisture to promote growth. Specific plant species; estimated planting acreage, spacing, and installation quantities; and suggested methods of irrigation by ecological planting zone we included in Table 3-1. The irrigation system should be 16 designed as a temporary system that can be abandoned after approximately 3 years. Additional supplemental irrigation applications may be required to properly establish plant growth in the new creek corridor. Water should not be applied at a rate that will cause erosion, damage to the plants, or r..:::o: f. The watering schedule should allow for a numnium of one application every 7 days fraom Apro through November. Each drip application should include a minimum of 25 gallons per plant NO week. Additional applications may be required from November through March if a minimum 0.5 inch of precipitation i•fall plantsduringperiod. The inigation system requirements will depend on rainfall factors for the project area, plant species selections, the quality of growth desired, and budgetary constraints. The amount of water F=equired determined from the type of plants to be /'.climate, terrain, and •il conditions. System piping layout, pipe sizes, and selection and spacing of sprinklers and drip emitters must ;Provide the required amount of water for the plant materials. The system should be designed to allow for irrigation of each planting zone separately. r T5 DMOZON1 I RON V ludelli r r The following channel diversion construction guidelines, implemented in sequence, will help to create favorable conditions for habitat and vegetation establishment and re'sult in successful mitigation: Wetland Mitigation and Monitoring Plan for the Chapter 3. Wetland Mitigation and Monitoring Plan Austin Road landfill Expansion, U. S. Arm *• Corps of Engineers File 199400974 Cin -of Stockton 3-5 April S. 1996