The testing of the surface-water toxicity correlated strongly with the extent of the impact. Similarly, the biotic integrity index integrity for the fish community in the Schoolhouse Brook and the Ompompanoosuc River degraded habitats throughout the system down the Ompompanoosuc River. (Crawford & Luoma, 1993)On the environmental sediments, similar extend of impairment are shown which is dominated by Copper. There is also localized degradation as a result of chromium, nickel, zinc and lead is evident on the documents with the basis of probable effects concentrations. There is a contrast in the equilibrium-partitioning sediment benchmarks. They indicate no toxic effects expected in the sediments at the reference sites but uncertain toxic effects throughout the Ely Brook and the schoolhouse Brook except in the reference sites and EB-600M site. The results from the EB-600M indicated toxic effects prediction.Acute toxicity test of the in situ pore waters by using Hyalella azteca are indicating several impacts in Ely Brook reaching 100 percent lethality at site EB-90M. Acute testing of the in situ pore water using Chronomus dilutes shows similar results but with severe toxicity. None of the sets of in situ power water toxicity testing showed a significant impairment in Schoolhouse Brook ort in the Ompompanoosuc River. Another test done is through the chronic sediment toxicity using Hyalella Azteca. This test indicates significant toxicity in Ely Brook, except at site EB-90M and in Schoolhouse Brook. (Fuller & Harvey, 2000)The low toxicity of EB-90M may be as a result of reflection of the low liability of the copper in the sediment as indicated by low proportions of extractable copper.Generally, the information can be used to develop an overall assessment of the impact on the aquatic system. The system appears to be as a result of acidic rock drainage at the Ely Mine. The results indicate that more than 700 meters of Ely Brook with the inclusion of two of the six ponds, were found to have severely impacted on water-quality data and biological assessment basis. The location had good quality of water and biological assessments but just a distance meter from the schoolhouse, there are severely impacted quality.The biological community recovers near the confluence with the Ompompanoosuc River. There is less conclusive evidence though, regarding the Ompompanoosuc River. The sediment data suggest that the
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