More Monitoring Results from Bayou Corne, all below levels of concern.
NORM detected in Bayou Corne Sinkhole, well below acceptable levels.
The Louisiana Department of Environmental Quality( LA DEQ) released the results of testing for NORM (Naturally Occurring Radioactive Material) in the Bayou Corne Slurry Area on August 15, 2012. The water/liquid sample was collected from a depth of 80 feet in the slurry area.
The results of the testing demonstrated the presence of NORM, but at concentrations well below acceptable levels and is not available to cause human health exposure.
Radium-226 was detected as being present at a concentration of 63.569 pCi/liter.
Radium-228 was detected as being present at a concentration of 18.705 pCi/liter.
Radium-226 and Ra-228 correspond to the components in NORM and correspond to the material disposed of in the Texas Brine cavern but are well below acceptable levels.
Continued Air Sampling
The highest Benzene concentration in the air of Bayou Corne was detected on August 19, 2012. The DEQ results of air samples collected on August 18 and 19, 2012 are now available. The DEQ is currently posting the results of two samples collected each day in the residential area of Bayou Corne at the intersection of Gumbo St. and LA Highway 70. The first sample each day is collected at approximately 6:35 AM and the second sample is collected about 11:30 AM.
On August 19, 2012, the highest concentration of benzene, 0.90 ppbv, a known human cancer causing agent, yet detected in the Bayou Corne area, was detected in the residential area at the intersection of Gumbo St. and LA Highway 70, at 6:35 AM. The LA DEQ Ambient Air Standard for benzene is based on an annual mean concentration of 3.76 ppb. The benzene concentration in the air on August 19, 2012, was well below the ambient air standard (23% of the ambient air standard) and was well below concentrations that would cause impacts to human health. The concentration of benzene at the intersection of Gumbo St. and LA Highway 70 had decreased to 0.49 ppbv at 11:28 AM. On August 18, 2012, the benzene concentration was 0.44 ppbv at 6:35 AM and had decreased to 0.09 ppbv at 11:32 AM, at the intersection of Gumbo St. and LA Highway 70. The concentrations of benzene were highest in the early morning, 6:30 AM time period. These benzene concentrations are still well below the LA DEQ Ambient Air Standard.
The concentrations of toluene, ethylbenzene, and m,p-xylene increased in concentration from the 6:30 AM sampling period to the 11:30 AM sampling period on August 19, 2012. The concentrations of these chemicals were well below the LA DEQ Ambient Air Standards.
Trace levels (0.01 ppbv) of Vinyl Chloride, a known human cancer causing agent, were detected in the August 18 and 19 sampling periods. This trace level of Vinyl Chloride was below the analytical detection level and well below the LA DEQ Ambient Air Standard.
The tentatively identified compounds detected on August 18 and 19, 2012 corresponded to the tentative identified compounds detected on August 16, 2012: 2-methyl butane, 2-methyl pentane, and isobutane.