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Serpentinous sediment from this site is a potential source of non-anthropogenic Cr contamination. Chromium-bearing minerals such as Cr-spinel appear to be the main source of Cr in the sediment; however, Cr-bearing silicates and clay minerals are additional Cr sources. Aqueous Cr concentrations in the sediment are <4.6 mg/L; however, the valence of Cr was not identified in the solutions or in the sediment. Although there is no indication of Cr(VI) contamination derived from the serpentinous sediment, elevated Cr concentrations in the sediment, the observed \u2018dissolution\u2019 textures of the Cr-bearing minerals, the estimated redox environment, and water chemistry indicate the formation of Cr(VI) is potentially favorable.", "description": "10 p.", "publisher": { "@type": "Organization", "name": "U.S. Geological Survey" }, "author": [ { "@type": "Person", "name": "Hanson, Randall T. rthanson@usgs.gov", "givenName": "Randall T.", "familyName": "Hanson", "email": "rthanson@usgs.gov", "identifier": { "@type": "PropertyValue", "propertyID": "ORCID", "value": "0000-0002-9819-7141", "url": "https://orcid.org/0000-0002-9819-7141" }, "affiliation": [ { "@type": "Organization", "name": "California Water Science Center", "url": "https://www.usgs.gov/centers/california-water-science-center" } ] }, { "@type": "Person", "name": "Wentworth, Carl M. cwent@usgs.gov", "givenName": "Carl M.", 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