DOE/ORO/2327 Oak Ridge Reservation Annual Site Environmental ...

Oak Ridge Reservation
Discharge
Point
Effluent
Parameter
4-48 The Y-12 National Security Complex
Table 4.10 (continued)
Daily
Avg
(lb/d)
Daily
Max
(lb/d)
Daily
Avg
(mg/L)
Daily
Max
(mg/L)
Percentage
of
Compliance
Outfall C11 pH, standard units a 9.0 100 27
Total Residual
Chlorine
0.019 100 26
Temperature ( o C) 30.5 100 27
Outfall S06 pH, standard units a 9.0 100 2
Outfall S19 pH, standard units a 9.0 100 1
Outfall S24 pH, standard units a 9.0 100 5
Category I outfalls pH, standard units a 9.0 100 20
Category II outfalls pH, standard units a 9.0 100 29
Total Residual
Chlorine
0.5 100 28
Category III outfalls pH, standard units a 9.0 100 10
Total Residual
Chlorine
0.5 100 10
a Not applicable.
b No discharge.
4.5.2 Radiological Monitoring Plan and Results
No. of
Samples
A radiological monitoring plan is in place at the Y-12 Complex to address compliance with DOE
orders and NPDES Permit TN002968. The permit requires the Y-12 Complex to submit results from the
radiological monitoring plan quarterly as an addendum to the NPDES discharge monitoring report. There
were no discharge limits set by the NPDES permit for radionuclides; the requirement is to monitor and
report. The radiological monitoring plan was developed based on an analysis of operational history,
expected chemical and physical relationships, and historical monitoring results. Under the existing plan,
effluent monitoring is conducted at three types of locations: (1) treatment facilities, (2) other point-source
and area-source discharges, and (3) instream locations. Operational history and past monitoring results
provide a basis for parameters routinely monitored under the plan (Table 4.11). The current Radiological
Monitoring Plan for Y-12 Complex (Y-12 2006) was last revised and reissued in June 2006.
Radiological monitoring during storm water events is accomplished as part of the storm water
monitoring program. Uranium is monitored at three major East Fork Poplar Creek storm water outfalls,
four instream monitoring locations as well as raw water flow, and at an instream outfall on Bear Creek.
Results of storm event monitoring during 2009 were reported in Annual Storm Water Report for the Y-12
National Security Complex (B&W Y-12 2010), which was issued in January 2010. In addition, the
monthly 7-day composite sample for radiological parameters taken at Station 17 on East Fork Poplar
Creek likely includes rain events.
Radiological monitoring plan locations sampled in 2009 are noted in Fig. 4.24. Table 4.12 identifies
the monitored locations, the frequency of monitoring, and the sum of the percentages of the derived
concentration guidelines (DCGs) for radionuclides measured in 2009. Radiological data were well
below the allowable DCGs.
In 2009, the total mass of uranium and associated curies released from the Y-12 Complex at the
easternmost monitoring station, Station 17 on Upper East Fork Poplar Creek, was 187 kg or 0.067 Ci
(Table 4.13). Figure 4.25 illustrates a 5-year trend of these releases. The total release is calculated by
multiplying the average concentration (grams per liter) by the average flow (million gallons per day).