Remedial and monitoring efforts at the site of a polychlorinated biphenyl (PCB) spill in Regina, Saskatchewan, Canada, has produced information in addition to that found in the original investigation and reported in this journal. Additional pathways exist for horizontal movement of PCB within the underlying clays and silts. The PCB has moved horizontal at depth apparently under its own head resulting in deep contamination that does not have a surface expression.
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James W. Atwater (1984) studied this question.
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