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

Annual Site Environmental Report
Table 3.22. Analytical results from sampling performed at storm water outfall 490
Gross alpha
(pCi/L)
Gross beta
(pCi/L)
U-233/234
(pCi/L)
U-235/236
(pCi/L)
U-238
(pCi/L)
Tc-99
(pCi/L)
Total U
(µg/L)
Screening level 15 50 20 24 24 4000 31
July 2001 5 52 1.22 U 0.24 U a 0 U 17 1 U
January 2002 17.3 81.5 2.01 0.05 U 0.38 60.9 2.75 U
August 2005 2.45 J 7 1.57 No data 0.44 108 No data
February 2007 9.71 22.8 3.32 No data 0.9 28.6 U No data
October 2008 7.57 29.6 0.82 No data -0.08 U 38.5 –0.18 U
February 2009 10.6 57.1 No data 0.079 0.41 95.4 1.3
a U—analyte not detected in sample.
Gross alpha radiation was detected in the discharges from storm water outfalls 160, 292, and 350 at
levels that exceeded the screening level for gross alpha activity of 15 pCi/L (Tables 3.14, 3.20, and 3.21).
Results for gross alpha radiation collected at these locations since 2001 indicate that the gross alpha
radiation results collected during this portion of the 2009 SWPP Program sampling effort are within the
historical range.
Gross beta radiation was detected in the discharges from storm water outfalls 160, 350 and 490 at
levels which exceed the MCL of 50 pCi/L for this analyte (Tables 3.14, 3.21 and 3.22). Results for gross
beta radiation collected at these location since 2001 indicate that the gross beta radiation results collected
during this portion of the 2009 SWPP Program sampling effort are within the historical range.
Uranium 233/234 was detected in the discharges from storm water outfalls 160, 292, and 350 at levels
which exceed the 4% of DCG level of 20 pCi/L for this radionuclide (Tables 3.14, 3.20 and 3.21). Results
for U-233/234 collected at these locations since 2001 indicate that the U-233/234 results collected during
this portion of the 2009 SWPP Program sampling effort are within the historical range.
Uranium 238 was detected in the discharges from storm water outfalls 160 and 350 at levels which
exceed the 4% of DCG level of 24 pCi/L for this radionuclide (Tables 3.14 and 3.21). Results for U-238
collected at these locations since 2001 indicate that the U-238 levels in data collected during this portion
of the 2009 SWPP Program are within the historical range.
Total uranium was detected in the discharges from outfalls 160, 292 and 350 at levels which exceeds
the screening level of 31 µg/L for this analyte (Tables 3.14, 3.20 and 3.21). Limited historical data for
total uranium indicate that the total uranium level in data collected during this portion of the 2009 SWPP
Program are within the historical range.
3.5.1.5 Monitoring Conducted as Part of the Demolition of Building K-1035
Building K-1035 was built in 1945 as a maintenance general stores warehouse. In the early 1960s it
was converted to an instrument maintenance facility. Shop activities have included an instrument shop,
metal cabinet fabrication, a photoelectroplating process, printed circuit board fabrication shop, acid
cleaning area, line recorder cleaning, and pneumatic repair shop. To the south of the building are the K-
1035 Acid Pits. These two pits, an acid pit and neutralization pit, received acid and solvent wastes from
two dedicated instrument shops, the Printed Circuit Board Fabrication Facility and the Acid Cleaning
Area, within the building. The process drains from the acid pit and the neutralization pit flow to a single
catch basin that discharges to the storm drain 190 network. The Acid Cleaning Area operated from the
early 1960s to 1985, and the Printed Circuit Board Fabrication Facility operated from the early 1960s to
1977.
In April 2009, work began on the demolition of Building K-1035 (Fig. 3.22). All materials that
potentially contained asbestos, including siding, pipe insulation, roofing material, etc. were removed prior
to general demolition using heavy equipment. The remainder of the building was demolished using heavy
equipment. In June 2009, the building was reduced to rubble (Fig. 3.23). Final removal of building rubble
East Tennessee Technology Park 3-41