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

Oak Ridge Reservation
3.5.1.6 Monitoring of K-1006 Sump
3-48 East Tennessee Technology Park
Fig. 3.33. PCB results at manhole 13074A.
The Building K-1006 basement sump is a 30 inch diameter by 36 inch deep concrete structure. It is
located in the northeast corner basement of the K-1006 laboratory building (Fig. 3.22) beneath the interior
stairwell. The sump receives groundwater flow that is periodically pumped to the sanitary sewer system
by a float-controlled pump. The Baseline Environmental Assessment Report (BEAR) for the K-1006
Material and Chemistry Laboratory, K/EM-543/R1, states that the sump located in the northeast corner of
the basement accumulates rain water from a drain in the concrete floor area adjacent to the outside door of
the basement. Discharge from this sump was believed to be routed to storm drain 100. It used to also
receive water from steam condensate and a sink drain in the room C 107. The sink drain has been
removed from service. The sump had not previously been recorded as part of the sump registration
program that was conducted in the mid 1990’s, and it had never been assigned an identification number.
The sump was registered in 2008 and was designated as sump S-073A.
In May 2007, sediment present in the bottom of the sump was sampled. This sampling was performed
under CERCLA to determine if the sump met the requirements of the Zone 2 Record of Decision.
Samples of the solids were found to exceed applicable remediation levels for the radium/thorium decay
series (41.64 pCi/g), PCB-1254 (23,000 mg/kg), and U-238 (116 pCi/g). Due to these exceedances of
remediation levels, the sump did not meet the applicable CERCLA requirements, and remediation of the
sediments in the sump was required.
In January 2009, water samples from the sump were obtained while the sediment was still in the sump
to determine if any contaminants of concern were being discharged from the sump. The samples were
analyzed for gross alpha, gross beta, VOCs, metals, isotopic uranium and thorium. The analytical results
from this water sampling effort that exceeded screening levels are presented in Table 3.23.
In February 2009, a dye test was performed to verify whether the sump discharges to the
environment, and if it does, whether it discharges to the storm drain system, the sanitary sewer system, or
into the soil. Several floor drains in the basement of K-1006 appeared to drain into the sump. These floor
drains were also tested to verify whether or not the floor drains are connected to the sump. A drain at the
foot of an external stairwell was also thought to drain into the sump, so it was also dye tested. The dye
test indicated that the sump was connected to the sanitary sewer system. The floor drain at the north end
of the basement was found to discharge to the sump. A floor drain located near the exit door of the
basement was found to be plugged. Additionally, it was found that the drain located at the foot of the
external stairs was also connected to the sump. This drain appears to be the major contributor of water to
the sump.