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Fig. 4. Temporal variability in volatile organic compound (VOC) concentrations: (a) trichloroethylene (TCE); (b) tetrachloroethylene (PCE); (c) cis-1,2-dichloroethylene (cis-1,2-DCE); and (d) 1,1-dichloroethylene (1,1-DCE). The lower x axis denotes VOC concentrations in water; the upper x axis denotes VOC concentrations in air, calculated using Henry's constant. Closed symbols denote concentrations in the saturated zone; open symbols denote concentrations in the unsaturated zone; wt = water table.
