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

Annual Site Environmental Report
As part of the 2009 SWPP Program sampling effort, samples were collected at the north side of the
K-1420 building footprint (Fig. 3.18) in an area near the former calciner room. Samples were also
collected from storm water outfalls 158, 160, and 170 in concurrence with the K-1420 pad samples.
Samples of building pad runoff from the area were scheduled to be collected on a monthly basis during
wet weather conditions. However, due to the lack of qualifying storm events, these samples were only
collected during March, September, and October 2009. Analytical results exceeding screening levels in
2009 for outfalls 158, 160, and 170 as well as for the K-1420 pad runoff are given in Table 3.12.
Fig. 3.18. The K-1420 pad after demolition.
Table 3.12. Results exceeding screening levels for 2009 radiological monitoring
performed in conjunction with D&D activities a
Sampling Location
Date
Sampled
Gross alpha
radiation
(pCi/L)
Gross beta
radiation
(pCi/L)
Tc-99
(pCi/L)
U-233/234
(pCi/L)
U-238
(pCi/L)
Total
Uranium
(µg/L)
Outfall 158 3/26/09 153 58.4 b 75.6 47.3 145
Outfall 160 3/26/09 568 131 – 491 73 230
K-1420 Pad runoff 3/26/09 43.6 -- – 63 -- --
Outfall 158 9/16/09 79.2 – 47 32.1 97.2
Outfall 160 9/16/09 347 68.4 – 275 48 149
Outfall 170 9/16/09 – – – – – –
K-1420 Pad runoff 9/16/09 49.1 – – 35.9 – –
Outfall 158 10/14/09 79 – – 38.1 – 71.8
Outfall 160 10/14/09 312 – – 205 60.2 186
Outfall 170 10/14/09 – – – – – –
K-1420 Pad runoff 10/14/09 91.4 – – 69.1 – 41.5
a
Screening levels are 15 pCi/L gross alpha radiation, 50 pCi/L gross beta radiation, 4,000 pCi/L Tc-99,
20 pCi/L U-233/234, 24 pCi/L U-235 and U-238, and 31 µ/L total uranium.
b Dash indicates below screening level thresholds.
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