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• • Dominant Family: The dominant family was Hyalellidae (scuds). Hyalellidae dominated 39.5% of the sample, and has a tolerance value of 8 on a scale of 0 -10 (the lower the tolerance value, the lower their tolerance to pollution). They are closely related to Gammaridae (note the pollution tolerance difference). The distinction between the two families is the flagellum found on the antennae of Gammaridae. They are important food sources for fish and invertebrate predators. They can be extremely abundant in water bodies without fish and are important in the breakdown of organic matter. (Guide to Aquatic Invertebrates of the Upper Midwest, R.W. Bouchard, Jr). Number of Families: In 2012,17 families were identified in the sample. This compares to 15 families in 2011 and 15 families in 2010. In general, a more diverse sample suggests a healthier stream environment. EPT: Ephemeroptera - Plecoptera - Tricoptera (Mayfly - Stonefly - Caddisfly) are three Orders of invertebrates with low tolerance to pollution. The more of these families in a sample, the better. More than 10 -12 families is considered good. In 2012, no EPT families were identified in the sample. 4.3.4c Field Sampling Results - Rice Creek Irondale' Site Rice Creek `Irondale — 2012 Primary Sampling Data Historical Field Results for Rice Creek `Irondale Site Date # Identified Family Biotic Index EPT # of Families Dominant Family Dominant Family % Overall Field Samp ing Results: 9/2/12 1 165 1 6.8 1 2 1 13 1 Chironomidae 1 60.6% • Ephemeroptera • Plecoptera a Tricoptera ■ Diptera Rice Creek `Irondale' Data Summary Family Biotic Index (FBI): Our 2012 SHEP field sampling results produced a score of 6.8 for the Rice Creek `Irondale' site. This score corresponds to a "Poor" rating on the