Periphyton is monitored at three sites in EFPC on a quarterly schedule.
|Algal biomass and photosynthetic rates are elevated in EFPC in comparison with reference streams.|
|Concentrations of nutrients, including nitrate, ammonia and phosphate, that were measured concurrently with periphyton, also continued to be higher in EFPC than in reference streams, although levels have decreased significantly at upstream sites (EFK 24.4 and EFK 23.4) from pre-flow management levels.|
|Concentrations of metals in periphyton collected from upper EFPC sites decreased with distance downstream from the Y-12 Plant, and also have declined over the past few years (Figure 1).|
|Figure 1. Metals in periphyton.|
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