2010-10-25_HYDROLOGY - M1977300 - Laserfiche WebLink

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Client: Copper Mountain CMD CO-0021598 SCG Project No.: 310921 Site: WWTP Fathead minnow Test Results Fathead minnow results are summarized in Table 3 and are provided on data sheets in Appendix 3. Survival was 73% in the 100% effluent concentration and ranged from 75% - 88% in the remaining effluent concentrations. Control survival was 88%. No statistically significant differences for survival were measured in the test. The IC25 for survival was >1 00%. Table 3. Summary of Fathead minnow test results. Forty fish were exposed at each concentration. An asterisk (*) denotes a statistically significant difference from the control. No. Avg. Wt. Significant Difference Concentration Alive m) Min. Max. Survival Growth , Control (0%) 35 0.410 0.380 0.408 12.5% 35 0.380 0.349 0.410 25% 33 0.413 0.348 0.468 50% 34 0.436 0.310 0.557 75% 30 0.527 0.457 0.653 100% 29 0.534 0.483 0.587 Average weight in the 100% effluent concentration was 0.534mg and ranged from 0.380mg - 0.527mg per individual in the remaining effluent concentrations. Average weight for the control fish was 0.410mg for statistical analyses and 0.389mg for test acceptability criteria. No statistically significant differences were measured for growth in any effluent concentration when compared to the control. The IC25 for growth was >100%. Test Acceptability Acceptable control survival was achieved in both tests. Similarly, Ceriodaphnia dubia reproduction and Fathead minnow growth in control organisms met required levels. PMSD was within the required limits for an acceptable test (Table 4). Table 4. PMSD for chronic test parameters. Survival Growth Reproduction Result Fathead Lower Upper Lower Upper Test Ceriodaphnia dubia Minnow bound bound bound bound parameters 12 30 13 47 deemed to be PMSD acceptable if numbers (% Minimum fall within significant limits for difference) N/A N/A 28.6 26.8 the test. SeaCrest Group