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

Annual Site Environmental Report
sumps have been filled. Water from the sumps that are still active may be discharged to the ETTP storm
water drainage system, the ETTP sanitary sewer system, or may be routed to the CNF.
Sumps were sampled as part of the ETTP accumulated water discharge program from 1994 until
1998. During 1998, ETTP Clean Water Act Program personnel analyzed the historical data from the
previous year’s sampling events and determined that the sump program would be suspended. Except for
the sampling of a few selected sumps as part of the 2002 SWPP Program sampling program, no analytical
data have been collected from the sumps since the program was suspended.
As part of the 2009 SWPP Program, all of the sumps that actively collect and discharge groundwater
and storm water were identified. Approximately 15 sumps were thought to be currently active at the
ETTP. In order to obtain current analytical data for these active sumps, each was to be sampled for
parameters that were selected based on past analytical results from the sump. Table 3.33 provides
information on the locations of the active sumps that were sampled in 2009, where they discharge, and the
parameters they were sampled for.
Sump
number
Table 3.33. Sampling of sumps believed to be active at the ETTP
Building/area
S054 K-732 Switchyard
Location/sump
description
basement, center, near
columns 15 and 16
Discharge
point
Outfall 440
S055 K-732 Switchyard valve vault 2 Outfall 440
S056 K-732 Switchyard valve vault 3 Outfall 440
S057 K-732 Switchyard synchronous condenser 101 Outfall 440
S058 K-732 Switchyard synchronous condenser 102 Outfall 440
S059 K-732 Switchyard synchronous condenser 103 Outfall 440
The sumps located in the K-732 switchyard (Fig. 3.22)
were sampled in August 2009. The analytical results from
this water sampling effort that exceeded screening levels are
presented in Table 3.34. PCBs were detected at levels above
screening criteria in four of the six sumps that were sampled.
All of the sumps that were found to contain elevated levels of
PCBs discharge through oil/water separators. These devices
have proven to be effective in removing any traces of oil
which may contain PCBs. PCBs have only rarely been noted
in analytical data from storm water outfalls which are served
by oil/water separators.
Parameters to be sampled
PCBs, VOCs, pH, visual check for
oily sheen
PCBs, VOCs, pH, visual check for
oily sheen
PCBs, VOCs, pH, visual check for
oily sheen
PCBs, VOCs, pH, visual check for
oily sheen
PCBs, VOCs, pH, visual check for
oily sheen
PCBs, VOCs, pH, visual check for
oily sheen
Sampling of the sumps located in the K-762 Switchyard, Building K-1037, and Building K-1210 will
be performed in 2010.
3.5.1.12 NPDES Monitoring at the CNF Waste Water Treatment System
Table 3.34. K-732 Switchyard sump
sampling results exceeding
screening levels
Location
sampled
PCB-1254
(µg/L)
PCB-1260
(µg/L)
S054 0.086
S057 6
S058 0.36
S059 36.6
Nonradiological monitoring of CNF effluent is conducted according to the requirements of NPDES
Permit No. TN0074225. Monitoring requirements, frequencies, and sample types required under the
permit are listed in Table 3.35. Wastewater from CNF is discharged through outfall 001 into the Clinch
River.
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