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KLEINFFLDER <br /> 5 CONCLUSIONS <br /> The City of Lodi Landfill is an approximately 3.7-acre site located on the southeast comer <br /> of 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 /> 0 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 /> 0 Observed debris includes concrete, asphalt,some wood,glass, and metal. <br /> 0 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 /> 0 Ionizable compounds are.present at concentrations of 150 to 350 ppmv along <br /> the west side of the landfill. Detectable concentrations of ionizable <br /> compounds 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 /> p <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 vado5e 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 />