ARCHIVED REPORTS_1996_2 - Laserfiche WebLink

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61 LJ M 11 The City of Stockton (City), to serve the long-term disposal needs of its increasing population, is planning to expand the Austin Road Landfill located 3 miles southeast of Stockton. The project will expand the area of landfill operation and increase the landfill capacity. The active landfill area will be expanded to the south of the existing landfill site and will include filling a portion of the north branch of the south fork of Littlejohn Creek. The purpose of this document is to present the City's proposed resource mitigation and monitoring plan for impacts on Littlejohns Creek. The landfill expansion project would affect a 7,600 -foot reach of the north branch of the south fork of Littlejohn Creek. The impact consists of filling 2.895 acres of jurisdictional waters of the United States, including 2.036 acres of open water habitat and 0.859 acre of wetlands, generally restricted to a thin strip along the water's edge. Ruderal vegetation and scattered riparian trees and shrubs are present on the channelbanks, although ongoing flood -control maintenance of the channel periodically removes the woody vegetation. The channel of Littlejohn Creek does not provide harborage for fish or other aquatic wildlife, except for a few uprooted trees and a narrow strip of floating vegetation along the water's edge. No plant or animal species listed as threatened or endangered occur within the existing creek corridor. The mitigation concept for realigning the creek channel combines enlarging the floodplain, increasing the extent of wildlife habitat, and establishing riparian vegetation that will not impede floodflows. This plan will create 2.97 acres of waters of the United States and 39.4 acres of associated riparian habitat, resulting in a significant net gain of habitat. The realigned channel will be designed to maintain the flood -control function of the existing creek and to incorporate other special requirements of governing agencies. The realigned channel will have channel length, slope, and meander -belt average width similar to those of the existing creek channel. The realigned creek will have a 200 -foot -wide floodplain within which the low -flow channel will gently meander. ® Plantings will be divided into three distinct ecological planting habitats including an oak - woodland zone, a cottonwood -willow zone, and a creekside zone. The compensation areas are designed to exceed the functions and values of the impacted resource and to be self-sustaining. Performance standards are set to achieve closed canopy cover in the creekside and cottonwood -willow zones and to achieve 75% survival of all riparian plantings. The created habitats will be monitored for a period of 5 years to ensure compensation _ objectives are met and that created habitats are functioning as designed. Annual vegetation monitoring techniques to identify significant factors affecting plant survival will include individual plant counts and a visual estimate of percent vegetation cover. Annual -monitoring reports documenting the project's performance will be submitted to the regulating resource agencies. Wetland Mitigation and Monitoring Plan for the Summary Austin Road Landfill Expansion. U. S. Army Corps of Engineers File 199400974 n of Srorkron S-1 April S. 1996 Ci