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F FAREA DESCRIPTION The proposed landfill expansion site has a relatively flat topography, ranging in elevation from 30 to 40 feet msl. The north branch of the south fork of Littlejohns Creek, the area affected by the landfill expansion, has a trapezoidal cross section with 2.1 side slopes. Channel width on the project Fsite ranges from 8 to 18 feet. Water levels in the stream range from a few inches to over 5 feet during storm events. The stream is generally perennial, although creek flows in summer and fall'are substantially lower than in winter. �S The existing channel banks are earthen, steep, sparsely vegetated with non-native grasses and ruderal species. Juvenile riparian trees are scattered throughout the length of the channel, but mature riparian trees and shrubs are absent, primarily because of routine flood-control maintenance activities. Within the stream channel, floating and emergent aquatic vegetation occur in a narrow strip along the water's edge. Of the 2,895 acres delineated as waters of the United States, the total vegetated wetland area is approximately 0.859 acre. FADDITIONAL INFORMATION y The final environmental impact report (EIR) for the Austin Road Landfill Expansion Project (SCH 90020718) was certified by the Stockton City Council on September 6, 1994. The EIR identified the realignment of Littlejohns Creek as a significant impact, but concluded that relocating the stream and enhancing the habitat values was preferred to maintaining the stream in its present alignment, subject to potential surface-water contamination from the expanded landfill. The EIR concluded that implementation of the mitigation measures would reduce the impact to less-than- significant levels. A written request for water quality certification for the Austin Road Landfill expansion project has been made to the California Regional Water Quality Control Board (RWQCB), Central Valley Region. ! Based on surveys prepared for the Austin Road Landfill Expansion project EIR,no federally listed threatened or endangered species would be affected by the proposed landfill expansion. t The cultural resources study prepared for the project EIR identified no archaeological, historical, or other sites of cultural significance on the Austin Road Landfill site. The study was l: 1 submitted to the State Historic Preservation Officer(SHPO) who concurred with that finding. The City initially requested Section 404 authorization under Nationwide Permit 26 in October 1995. Subsequent conversations with the U. S. Army Corps of Engineers (Corps) revealed that the project area was below the headwaters of Littlejohns Creek; consequently, the predischarge j .notification was withdrawn. The applicant is now applying for an individual permit under Section ` 404. ' e , Cin,of 5rockton Permit Application for the Austin Road April 5, 1996 3 Landfill L'.xpansiov Project