Native ground water entering the reactive chemical barriers is near neutral in pH. After contacting the ZVI barrier material, the pH of the water exceeds 9.0 units. After exiting the ZVI barrier, the pH value of the water is near neutral. The pH values of water from within AFO and PO4 barriers are near neutral, ranging between 6.4 to 7.6 pH units.

Contour map of pH in the PO4 barrier.

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