![TENORM: Bauxite and Alumina Production Wastes | US EPA](/e69yszg/322.jpg)
TENORM: Bauxite and Alumina Production Wastes | US EPA
In some red mud samples, the EPA has identified elevated arsenic and chromium concentrations; in some cases, arsenic levels were as high as 16,000 parts per billion (ppb), and chromium, 374,000 ppb. In the United States, wastes are usually disposed in large impoundments that are lined with clay .