Table 4.21. Y-12 TCMP summary information for 1995a
Site/Building       Test date       Species      NOECb

(%)

   

   48-h LC50c

(%)

   

   96-h LC50d

(%)

   

   IWCe

(%)

Groundwater Treatment Facility       4/5       Ceriodaphnia        0.5                     2.09
(Outfall 512)              Fathead minnow       10                     2.09
Outfall 201       5/3       Ceriodaphnia        100              \math{>}100       f
              Fathead minnow       100              \math{>}100       f
Outfall 201       5/10       Ceriodaphnia        80              \math{>}100       f
              Fathead minnow       100              \math{>}100       f
Outfall 201       5/17       Ceriodaphnia        \math{<}80              \math{>}100       f
              Fathead minnow       100              \math{>}100       f
Outfall 201       5/31       Ceriodaphnia        80              \math{>}100       f
              Fathead minnow       100              \math{>}100       f
Central Pollution Control Facility       5/31       Ceriodaphnia        100                     0.23
(Outfall 501)              Fathead minnow       100                     0.23
Outfall 201       6/7       Ceriodaphnia        80              \math{>}100       f
              Fathead minnow       100              \math{>}100       f
Outfall 201       6/14       Ceriodaphnia        100              \math{>}100       f
              Fathead minnow       80              \math{>}100       f
Groundwater Treatment Facility       6/15       Ceriodaphnia               \math{>}100              0.73
              Fathead minnow              \math{>}100              0.73
9422-11 Storm Sewer       6/15       Ceriodaphnia               38.5              g
              Fathead minnow              \math{>}100              g
9422-15 Storm Sewer       6/15       Ceriodaphnia               77.2              g
              Fathead minnow              \math{>}100              g
9422-12 Storm Sewer       6/17       Ceriodaphnia               37.3              g
              Fathead minnow              74.8              g
9422-16 Storm Sewer       6/17       Ceriodaphnia               \math{>}100              g
              Fathead minnow              \math{>}100              g
Central Pollution Control Facility       6/19       Ceriodaphnia               \math{>}100              0.40
(Outfall 501)              Fathead minnow              \math{>}100              0.40
Outfall 201       6/21       Ceriodaphnia        100              \math{>}100       f
              Fathead minnow       100              \math{>}100       g
aThese 7-day chronic tests and 48-hour acute tests using fathead minnows and Ceriodaphnia were completed in 1995 as part of the TCMP conducted for the Y-12 Plant by ORNL. Summarized are the effluents and their corresponding no-observed-effect concentrations, 48- or 96-hour LC50s, and in-stream waste concentrations (IWCs). Note: Discharge from the treatment facilities are intermittent because of batch operations.

bNo-observed-effect concentrations.
cThe concentration of effluent that is lethal to 50% of the test organisms in 48 hours.

dThe concentration of effluent that is lethal to 50% of the test organisms in 96 hours. The 96-hour LC50s were developed during the chronic tests.

e The IWC based on actual flows at East Fork Poplar Creek, station 8.
fThis is an in-stream point; therefore, an IWC is not applicable.

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