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The data used in this report was collected by two separate projects. The Surface Environmental Surveillance Project collected routine samples in 2008 at 41 locations on and around the Hanford Site, and had them analyzed for metals in addition to the normal radiological constituents. In 2004 and 2005, soil samples were collected at 117 locations on the Hanford Reach National Monument (HRNM) in support of the radiological release of that property. In 2008, archived HRNM soil samples were analyzed for metals to supplement the radiological analyses. Concentration results for 30 individual metals were generated by the analytical methods. Selenium and antimony were not measured at detectable concentrations in most of the samples. Mercury was detected in about half of the samples analyzed. All other constituents were measured at detectable concentrations in nearly all samples analyzed. The average concentrations measured in this study were well below the soil cleanup levels for unrestricted land use established by the Model Toxics Control Act (MTCA). In addition to the average concentration being less than the benchmark, the 90th percentile concentration was also lower than the benchmark for the metals included in the MTCA. The results indicate that the measured concentrations of metals in surface soil were within the expected natural range of concentrations

A Review of Metal Concentrations Measured in Surface Soil Samples Collected on and Around the Hanford Site