Benthic macroinvertebrates were sampled quantitatively at 2 sites in Little Beaver Creek, 1 site in Big Run, and at two reference streams, Sugar Run, and Sunfish Creek in fall 1991 through fall 1993.
 | The benthic community at Little Beaver Creek 5, just below Outfall X-230J7 is subject to toxic conditions. For example, the EPT (mayflies, stoneflies, and caddisflies - usually more sensitive invertebrates) richness was substantially lower than at reference streams (Figure 1). . |
| The impact on the benthic community decreased downstream in Little Beaver Creek, with EPT values similar to reference streams. |
| The community in Big Run showed some patterns typical of streams experiencing nutrient enrichment, with EPT values moderate between the two Little Beaver sites. |
| Figure 1. Ephemeroptera (mayflies), Plecoptera (stoneflies), and Trichoptera (caddisflies) (EPT) richness in streams near PORTS and in reference streams, 1991 to 1993. |
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Last Modified: April 17, 2001