Characteristics of the Contaminant Source & the Contaminants Reaching the Water Table
Composition of the spill:
CCA liquid composed of a mixture of potassium dichromate, sodium arsenate, and cupric oxide dissolved in water.
Contaminants in the ground water:
The maximum concentrations of potassium dichromate, sodium arsenate, and cupric oxide found by the Emergency Response Team in the unsaturated zone immediately above the water table at the spill site were 27.3 mg/L, 2.1 mg/L, and 0.5 mg/L, respectively.
Analysis of groundwater samples collected from just below the water table at the spill site suggests that the maximum soluble chromium concentration is less than 30 mg/L. Arsenic and copper concentrations were below detection limits.