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KLEINFELDER <br /> 5 CONCLUSIONS <br /> The City of Lodi Landfill is an approximately .7-acre site located on the southeast comer <br /> of`the intersection of the Mokelumne River and the Southern Pacific Railroad in north <br /> Lodi, California (Plate 1). This site was used from approximately 1935 to 1955 and <br /> received grass clippings, tree limbs, leaves, and construction debris. <br /> Three previous studies performed on the site indicated that: <br /> o The highest concentration of debris and organic matter is located <br /> approximately 150 feet south of the Mokelumne River, in the center of the <br /> site. <br /> o Observed debris includes concrete, asphalt, some wood, glass, and metal. <br /> o Over parts of the site, debris appears to be mixed with a large proportion (up <br /> to 90 percent) of silty fine to medium sand. <br /> o Ionizable compounds are present at concentrations of 150 to 350 ppmv along <br /> the west side of the landfill. Detectable concentrations of ionizable <br /> Icompounds have not been observed along the east side of the landfill. One <br /> sample, collected from a gas well located approximately 150 feet south of the <br /> Mokelumne River, indicated the presence of methane at a concentration of <br /> 2.14 percent but did not indicate the presence of 10 Calderon volatile organic <br /> contaminants at detectable concentrations. <br /> In September 1988, Kleinfelder collected samples of the waste and vadose zone from four <br /> borings through the landfill. Kleinfelder also installed a well in the boring drilled <br /> approximately 150 feet south of the Mokelumne River in the center of the landfill. The <br /> well and the Mokelumne River upstream and downstream of the landfill were then <br /> sampled for chemical characterization. <br /> 137-88-1663 19 <br />