Quarterly Progress Report - Biological Monitoring Program for East Fork Poplar Creek Page: 6 of 20
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reported both here and on Discharge Monitoring Reports issued by the Y-12 Plant to the Tennessee
Department of Environment and Conservation.
2.2 Results/Progress
2.2.1 Toxicity monitoring
Ambient water samples from EFK 24.1 and effluent samples from Outfall 201 were evaluated for
toxicity to Ceriodaphnia dubia during July12-18, 2000. On each sampling day, grab samples of stream
water or 24-h time-proportional composite samples from Outfall 201 were collected for testing. Results
of the toxicity tests and attendant water-quality chemical analyses are shown in Tables 2.1 and 2.2.
Table 2.1. Results of Ceriodaphnia dubia toxicity tests of ambient sites from East
Fork Poplar Creek and Outfall 201 conducted July 12-18, 2000
Mean Reproduction
Sample Concentration (%) Survival (%) (offspring/surviving female SD)
Ambient sites
Control 100 100 21.6 3.9
EFK 24.1 100 100 23.5 3.8
Outfall 201
Control 100 100 21.6 3.9
Outfall 201 100 100 22.2 8.6
Outfall 201 80 100 24.3 3.1
Note: EFK = East Fork Poplar Creek kilometer. SD = standard deviation.
Table 2.2. Summary (mean SD) of water chemistry analyses conducted during
Ceriodaphnia dubia toxicity tests of ambient samples from East Fork Poplar Creek, April 12-
18, 2000
pH Alkalinity Hardness Conductivity
Sample (su) (mg/L as CaCO3) (mg/L as CaCO3) (pS/cm)
Control 8.1 0.1 85.2 1.6 98.7 2.4 200.7 3.1
Outfall 201 7.9 0.1 119.0 1.6 154.0 6.7 330.0 11.9
EFK 24.1 7.92 0.13 125.7 2.7 160.3 5.3 359.7 5.7
Note: EFK = East Fork Poplar Creek kilometer. SD = standard deviation.5
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Adams, S. M.; Christensen, S. W.; Greeley, M. S. Jr; Hill, W. R.; McCarthy, J. F.; Peterson, M. J. et al. Quarterly Progress Report - Biological Monitoring Program for East Fork Poplar Creek, report, October 18, 2000; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc718448/m1/6/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.