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In order to verify why the design criteria of the Neville Street well field of the 1 B mine pool passive treatment plant were not being met, four mine water tracer tests with uranine (Na-fluorescein) and rhodamine B were conducted in the system’s settling pond. Both tracers were injected at the pond’s aeration cascade during three separate tracer tests with varying flow conditions (54–158 L s−1). In addition, oxygen saturation and iron concentrations were measured during the first two tests. The aeration cascade works properly; O2 saturation reaches 81% after less than a second. However, the mean residence time in the settling pond was determined to be only 10–18 h. The plant operator installed five baffle sheets to increase the mean residence time in the settling pond. Tracer tests with uranine after the baffle sheets were installed revealed a new mean residence time of 35 h.

Tracer Test in a Settling Pond: The Passive Mine Water Treatment Plant of the 1 B Mine Pool, Nova Scotia, Canada