Table 4.22. Y-12 Plant Biomonitoring Program summary information for wastewater treatment systems and storm sewer effluents for 1995a
Site/Building       Test date       Species       48-h LC50b (%)       IWCc (%)
Central Pollution Control Facility       7/13       Ceriodaphnia        \math{>}100       0.41
(Outfall 501)              Fathead minnow       \math{>}100       0.41
Groundwater Treatment Facility       7/13       Ceriodaphnia        87.6       0.43
(Outfall 512)              Fathead minnow       40.7       0.43
9422-11 Storm Sewer       7/13       Ceriodaphnia        \math{>}100       d
              Fathead minnow       \math{>}100       d
9422-12 Storm Sewer       7/13       Ceriodaphnia        35.2       d
              Fathead minnow       85.4       d
9422-11 Storm Sewer       7/13       Ceriodaphnia        \math{>}100       d
(dechlorinated)              Fathead minnow       \math{>}100       d
9422-15 Storm Sewer       7/18       Ceriodaphnia        66.6       d
              Fathead minnow       \math{>}100       d
9422-15 Storm Sewer       7/18       Ceriodaphnia        71.8       d
(dechlorinated)              Fathead minnow       \math{>}100       d
9422-16 Storm Sewer       7/18       Ceriodaphnia        87.1      d
              Fathead minnow       \math{>}100      d
9422-16 Storm Sewer       7/18       Ceriodaphnia        \math{>}100       d
(dechlorinated)              Fathead minnow       \math{>}100       d
West End Treatment Facility       7/20       Ceriodaphnia        42.4       2.02
(Outfall 502)              Fathead minnow       82.9       2.02
Groundwater Treatment Facility       10/12       Ceriodaphnia        \math{>}100       0.31
(Outfall 512)                           
9422-11 Storm Sewer       10/12       Ceriodaphnia        39.5       d
9422-12 Storm Sewer       10/12       Ceriodaphnia        55.4       d
9422-12 Storm Sewer       10/12       Ceriodaphnia        \math{>}100       d
(dechlorinated)                           
9422-15 Storm Sewer       10/18       Ceriodaphnia        \math{>}100       d
9422-16 Storm Sewer       10/19       Ceriodaphnia        \math{>}100       d
West End Treatment Facility       10/25       Ceriodaphnia        24.2       0.78
(Outfall 502)                           
Central Pollution Control Facility       12/9       Ceriodaphnia        \math{>}100       0.36
(Outfall 501)                           
aThese 48-hour acute tests using fathead minnows and Ceriodaphnia were completed in 1995 as part of the Biomonitoring Program conducted for the Y-12 Plant by ORNL. Summarized are the effluents and their corresponding 48-hour LC50s and IWCs. Note: Discharge from the treatment facilities are intermittent because of batch operations.

bThe concentration of effluent that is lethal to 50% of the test organisms in 48 hours.

cThe IWC based on actual flows at East Fork Poplar Creek, Station 8.

dThis point is in the storm sewer system; therefore, an IWC is not applicable.