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KLEINFELDER <br /> 2 BACKGROUND <br /> o <br /> The City of Lodi Landfill is an approximately .7 acre site located n the southeast comer <br /> of the intersection of the Mokolumne 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 studies have been performed on the site: <br /> o "Preliminary Geotechnical Engineering Investigation, Proposed Residential <br /> Development," by The Foundation Engineers, dated November 30, 1982. <br /> o "Soils Investigation, ResidentialDevelopment," by Kleinfelder dated March <br /> 3, 1983. <br /> o "Gas Investigation, Residential," by Mandeville & Associates, dated March <br /> 1988. <br /> These three reports are included in Appendix A. <br /> Compiling the information presented in these three reports indicates the following: <br /> o The highest concentration of debris and organic matter appears to be located <br /> g <br /> approximately 150 feet south of the Mokolumne River, in the center of the <br /> site. <br /> o Observed debris included 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%) of silty fine to medium sand. <br /> ) are present at concentrations of 150 <br /> methane <br /> o Ionizable compounds (such as <br /> to 350 ppmv along the west side of the landfill. Detectable concentrations of <br /> 137-88-1663 2 <br />