Since it was first settled in 1841, California’s San Gabriel Valley, east of Los Angeles, has hosted a wide variety of industries. However, industrial development has left a significant portion of the Valley’s groundwater contaminated with various organic contaminants, including N-nitrosodimethylamine (NDMA) and 1,4-dioxane. Because much of the Valley’s water supply is obtained from this groundwater, treatment facilities are require

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