Howe Bridge Passive Treatment Facility near Clarion, PA
This view looks downstream from the second oxidation pond toward a "SAPS" pond. Upstream of this view, water reaches the surface after emanating from an anoxic limestone drain. Treatment is not 100% effective at this site because the system does not add sufficient alkalinity to neutralize acidity from the 270 mg/L of Fe in the influent.

Map view sketch of the Howe Bridge Facility

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