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Chapter 3. Wetland Miti ation and Monitoring Plan GOALS AND OBJECTIVES The mitigation concept has been prepared to meet the following goals and objectives: ■ Mitigate wetland impacts resulting from expansion of the Austin Road Landfill by enhancing the habitat value within the floodplain of the proposed creek realignment area exceeding that which is currently.found along the existing creek. ■ Meet and exceed the functions and values of the existing creek with the proposed realigned creek corridor. • Provide stream capacity that will accommodate floodflows as required by SJCFCD. ■ Provide a design program for the proposed creek realignment that will allow for decreased creek maintenance and reduced vegetation clearing activities compared with those currently incurred within the adversely affected portions (reaches) of the channel. ■ Provide for an action and compensation plan for creek mitigation to facilitate the City's landfill expansion needs. MITIGATION CONCEPT The proposed mitigation concept is to compensate for project impacts on the creek corridor by creating a new channel with characteristics similar to those of the existing stream channel and adding 39.4 acres of riparian habitat (Figure 3-1). The created channel has been designed to emulate the existing stream channel, having a similar channel length, slope, and meander-belt average width. The floodplain will be widened from its present average of 46 feet to an average of 200 feet, increasing the area by a ratio of 5:1. The floodplain will be planted with riparian trees and shrubs. The addition of riparian habitat will substantially increase the habitat value of the creek corridor by creating new plant and wildlife habitat and establishing a buffer between the landfill and the stream channel. The wider floodplain will allow for establishing riparian vegetation without impeding floodflows. The cross-sectional area of the low-flow channel of the realigned creek will be constructed to the same dimensions as those of the existing creek. If streamside wetlands develop to their existing Weiland Mitigation and Monitoring Plan for the Chapter 3. Weiland Mitigation and Monitoring Plait Austin Road landfill Expansion, U.S.ArinY Corps of Engineers File 199400974 City of Stockton 3-1 April S. 1996