Abstract
AbstractTetrachloroethene, trichloroethene, dichloroethenes, and vinyl chloride are collectively known as chlorinated ethenes. Chlorinated ethenes are some of the most prevalent organic ground water contaminants in North America and may develop large ground water plumes. If areas of free‐phase petroleum are present within the boundaries of a chlorinated ethene plume, consideration must be given to the interpretation of ground water samples due to interactions between chlorinated ethenes and the petroleum. Chlorinated ethene concentrations in ground water samples may be significantly greater than concentrations immediately upgradient of the free‐phase petroleum zone if any of the free‐phase petroleum is entrained in the sample due to turbidity or a sheen/layer of product. This occurs because a significant mass of chlorinated ethenes can partition into the petroleum. The bias due to the entrainment of petroleum in a ground water sample becomes significant if a visible thickness of petroleum or oily sediment occurs in the sample.
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