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Lodi City Landfill November 16,2011 North of Awani Drive,Lodi, California Project No. 104690061 • The City of Lodi 3.7-acre landfill site does not contain a LFG or groundwater monitoring network in accordance with CCR Title 27 requirements. There are no LFG or groundwater monitoring and reporting programs at the site. It is therefore not known whether LFG is pre- sent and/or may be migrating off site. (Only a one-time gas monitoring event was conducted as part of requesting the landfill be exempted from the SWAT program. 8. TOPOGRAPHY, GEOLOGY,AND GROUNDWATER The following sections provide general information on topographic and geologic conditions at the site,based on review of available maps. 8.1. Topography Based on a review of the 1978 United States Geological Survey (USGS), Lodi North, Cali- fornia 7.5-minute quadrangle map, the Lodi City Landfill is located immediately south of the Mokelumne River at an elevation of approximately 50 feet above mean sea level(MSL). • The waste disposal site is at a higher elevation towards the center.As indicated on the topog- raphic map, the area west of the railroad tracks and south of the river were the locations of "Industrial Waste Ponds" and buildings/structures to the adjacent south were associated with the former wineries. Similar industrial waste ponds and former and current wineries are located in the site vicinity along or in close proximity to the river(Figure 6). 8.2. Site Geology Based on review of the United States Geologic Survey (USGS) Regional Geologic Map, Sacramento, 1:250,000 scale, the site is underlain by Quaternary-age alluvial deposits. De- posits closest to the Mokelumne River are classified as Riverbank Deposits (alluvium) and outward from the river, the site is underlain by the lower member of the Modesto Formation (alluvium). Based on review of boring logs, subsurface alluvial soils encountered typically at the site and vicinity consist of various mixtures of sandy silt, fine to coarse sand, and silty sand (Appendix A). Based on information provided in the EIR (Kreines & Kreines, 1992) for the portion of the site west of the railroad tracks, subsurface soils reportedly consist of predominantly clayey and pebbly fine to coarse grained sands(Appendix A). • 10469"1 RfitW.dm 15 ffiv,yo. *oote