. 2012 survey assessments and analysis of fish, macroinvertebrates and herpetofauna in the Otter Creek coal tracts area of Powder River County . Table 2. Impairment determination thresholds from the MTDEQ MMI and 0/E (RIVPACS) models. Ecoregion RIVPACS Impairment Determination attributes of benthic macroinvertebrate communities that are sensitive to condition changes in the stream (in the form of pollution or pollutants). The index score represents the condition of the macroinvertebrate community at the time the sample was collected within that past year. If the index score is below the impair

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. 2012 survey assessments and analysis of fish, macroinvertebrates and herpetofauna in the Otter Creek coal tracts area of Powder River County . Table 2. Impairment determination thresholds from the MTDEQ MMI and 0/E (RIVPACS) models. Ecoregion RIVPACS Impairment Determination attributes of benthic macroinvertebrate communities that are sensitive to condition changes in the stream (in the form of pollution or pollutants). The index score represents the condition of the macroinvertebrate community at the time the sample was collected within that past year. If the index score is below the impairment threshold, the individual metrics can be used to provide insight as to why the communities are different from the reference condition (Barbour et. al 1999, Jessup et. al. 2005). The impairment threshold set by MTDEQ is 37 Mountain Low Valley Eastem Plains >; > or < > or < >63 4B 37 <37 Not impaired Impaired Not impaired Impaired Not impaired Impaired

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