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

Abstract

As part of the routine Hanford Site environmental surveillance program, researchers with the Surface Environmental Surveillance Project (SESP) collected soil samples at 41 locations on and around the Hanford Site in 2008. These samples were 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) and analyzed for radionuclides in support of the radiological release of that property. In 2008, archived HRNM soil samples (which were deemed expendable) were analyzed by SESP researchers for metals to supplement the radiological analyses previously performed, to expand the geographical coverage of the metals data set. Concentration results for 30 individual metals were generated by the analytical methods. Selenium and antimony were typically not measured at detectable concentrations. Mercury was detected in about half of the samples analyzed. All other constituents were measured at detectable concentrations in nearly all samples analyzed. The mean 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 also was 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 range of concentrations and consistent with previous results from samples collected on and around the Hanford Site.

A Slow-Release Substrate Stimulates Groundwater Microbial Communities for Long-Term in Situ Cr(VI) Reduction

“…In addition to Cr(VI), this site is contaminated with other metals (e.g., As, Cd, Pb), though at low concentrations (0.8−20.1 mg/kg). 20 A large number (3728) of genes involved in the resistance to other metals (e.g., As, Cd, Co, Ni, Pb, Hg, Se, Ag, Te) were detected as well, and some of them increased (P < 0.05) after HRC amendment (SI Figure S12). ).…”

“…Major contaminants in the groundwater are Cr(VI) (52−84 μg/L), NO 3 − (30−60 mg/L), and SO 4 −2 (56− 86 mg/L), though other metals are also present. 20 To perform field investigations, two ∼18.3 m deep, 15 cm diameter boreholes were cored, forming two wells (699−96−45 (45) and 699−96−44 (44)) ∼5 m apart (SI Figure S1B). The regional groundwater flows from well 45 to well 44.…”

“…The study was performed at the U.S. Department of Energy (DOE) 100-H Area in Hanford, WA, along the Cr­(VI)-contaminated groundwater pathway from the 100-D Area (point of initial contamination) to the Columbia River (SI Figure S1A). Major contaminants in the groundwater are Cr­(VI) (52–84 μg/L), NO 3 – (30–60 mg/L), and SO 4 –2 (56–86 mg/L), though other metals are also present . To perform field investigations, two ∼18.3 m deep, 15 cm diameter boreholes were cored, forming two wells (699–96–45 (45) and 699–96–44 (44)) ∼5 m apart (SI Figure S1B).…”

Le titane dans les sédiments de l'assainissement pluvial urbain : sources, concentrations, mobilités

“…La concentration en titane dans les sols varie en fonction de la pédologie des sites étudiés entre 1 à 5 g/kg de titane (Connor and Shacklette, 1975 ;Fritz, 2009). Dans certains sols, la concentration peut aller de 10 à 100 g/kg.…”