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

Annual Site Environmental Report
Fig. 5.46. Groundwater monitoring locations at the Spallation Neutron Source, 2009.
14 C analyses. Additionally, samples were collected during wet season base flow conditions for gross
activity (alpha and beta) and for selected gamma spectroscopic parameters.
SNS Site Results
Sampling at the SNS site occurred during March, June, September, and November 2009, and the
sampling results were compared to reference standards. Gross alpha activity was detected above the
applicable reference standard in the base flow sample collected from S-5 in March 2009. No other SNS
sample results exceeded reference standard values in 2009. Low concentrations of gross alpha activity
were detected in samples collected from S-1 and SW-1 during base flow conditions in March. In addition,
low concentrations of gross beta activity were detected in samples collected from S-2 and S-5 during base
flow conditions in March 2009. Carbon-14 was detected in a sample collected during base flow condition
at monitoring point S-4 in March 2009. Low concentrations of 3 H were detected numerous times during
2009. The following is a summary of the locations, flow conditions, and dates for the 3 H detections.
1. S-1 – (a) during falling limb flow conditions in March; (b) during base flow, rising limb, and falling
limb flow conditions in September; and c) during rising limb flow conditions in November
2. S-2 – (a) during base flow, rising limb, and falling limb flow conditions in September and (b) during
rising limb flow conditions in November
3. S-4 – during rising limb flow conditions in November
4. S-5 – (a) during base flow and rising limb flow conditions in September and (b) during rising limb
flow conditions in November
5. SW-1 – during rising limb flow conditions in September and November
Oak Ridge National Laboratory 5-81