Hexavalent Chromium (Cr VI) is relatively rare in the natural environment. Chemically it requires heavy oxidation of Chromium (Cr III) to produce the hybridized Cr VI. If heavy concentrations (above 2ug/m3) of Hexavalent Chromium are appearing in groundwater analyses; my advice is to conduct an intensive comprehensive grid analyses of the surrounding aquifer system at large and cross-reference all industrial enterprise factors which may contribute the required heavy oxidizers required to formulate Hexavalent Chromium. It is highly unusual to find heavy concentrations of this hybridized Chrome constituent in a natural setting. Especially since Cr VI readily reverts back to Cr III when exposed to alkalinity in the open environment. Without more information and analyses; my first finding reaction is that some driving source is yielding the elevated Cr VI constituent concentrations.

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Hexavalent Chromium (Cr VI) is relatively rare in the natural environment. Chemically it requires heavy oxidation of Chromium (Cr III) to produce the hybridized Cr VI. If heavy concentrations (above 2ug/m3) of Hexavalent Chromium are appearing in groundwater analyses; my advice is to conduct an intensive comprehensive grid analyses of the surrounding aquifer system at large and cross-reference all industrial enterprise factors which may contribute the required heavy oxidizers required to formulate Hexavalent Chromium. It is highly unusual to find heavy concentrations of this hybridized Chrome constituent in a natural setting. Especially since Cr VI readily reverts back to Cr III when exposed to alkalinity in the open environment. Without more information and analyses; my first finding reaction is that some driving source is yielding the elevated Cr VI constituent concentrations.