Oak Ridge Today

TVA says Claxton material that caused concern is consistent with soil

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Note: This story was last updated at 4:50 p.m.

The Tennessee Valley Authority said Thursday that the material that caused concern in Claxton, near the Bull Run Fossil Plant, is consistent with surface soil.

The material had reportedly fallen on vehicles, houses, mailboxes, and driveways in Claxton near Bull Run, a coal-fired TVA power plant. That raised concerns that the material might be coming from Bull Run.

On Thursday, TVA said it collected 11 samples and received three samples from a home owner and sent them to an independent laboratory for testing. That was in response to the concerns about the airborne materials found on vehicles and property around Bull Run, TVA said.

“Results show the material is not coming from air emissions at Bull Run and is consistent with surface soil in the area,” TVA said. “TDEC (Tennessee Department of Environment and Conservation) also sampled material at several locations, and their results affirm that the material is consistent with surface soil.”

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Field work complete, cleanup projects used $751 million in Recovery Act funding

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Building K-33

Building K-33 at the East Tennessee Technology Park, also known as the former K-25 site, before demolition. (DOE photo)

 

Note: This story was updated at 5:30 p.m.

The field work is complete on 27 cleanup projects at three federal sites in Oak Ridge that used $751 million in Recovery Act funds.

The U.S. Department of Energy’s Oak Ridge Office of Environmental Management, or EM, announced the end of the field work on Thursday.

“We’re done knocking down buildings and with all the work in the field,” said Mike Koentop, executive officer in Oak Ridge Office of Environmental Management. “We have paperwork left to do to close out projects.”

The American Recovery and Reinvestment Act of 2009, also known as the Recovery Act or stimulus bill, was passed by Congress and signed by President Barack Obama in February 2009. It was meant to help stimulate an economic recovery during the depths of the Great Recession, and it was intended to address long-neglected infrastructure projects and programs.

In Oak Ridge, the Recovery Act funding paid for several demolition projects such as the demolition of the 1.4-million-square-foot K-33 Building at the East Tennessee Technology Park and other projects ranging from mercury reduction at the Y-12 National Security Complex to transuranic waste processing at Oak Ridge National Laboratory. [Read more…]

UT Arboretum Society presents stormwater management lecture Tuesday

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The University of Tennessee Arboretum Society will present “The SMART Approach to Stormwater Management” on Tuesday at Roane State Community College in Oak Ridge. The lecture starts at 7 p.m.

Daniel Yoder, professor of biosystems engineering and soil science at the University of Tennessee, will present the program. A specialist in soil and water engineering, Yoder earned his undergraduate and doctorate degrees at Purdue University. His responsibilities and expertise include surface hydrology, erosion control, water quality, and hydrologic monitoring. [Read more…]

UT professor receives more than $880,000 in DOE funding for carbon cycle research

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UT Students Measure Soil Carbon Flux

Doctoral candidate Jessica Bryant, left; Associate Professor Aimee Classen, middle; and University of Tennessee undergraduate student Kelsey Richesin use Li-Cor 6400, a machine that measure carbon flux from soil. (Photo courtesy UT)

KNOXVILLE—Carbon dioxide is key to life on Earth, but too much of the good thing can overheat the Earth’s surface and hurt the very things it supports. Thus, understanding how carbon cycles through the atmosphere is crucial to predicting its effects.

A University of Tennessee professor in Knoxville has received more than $880,000 from the U.S. Department of Energy to investigate often-overlooked carbon cycle players.

Aimee Classen, associate professor of ecology and evolutionary biology, and her team, which includes Oak Ridge National Laboratory staff members, will examine factors that influence carbon cycling below the ground and are not included in today’s carbon-cycle models.

“We know that tiny things that live in soil, like fungi, can regulate carbon processes in forests. However, our current soil models don’t consider what role fungal and plant root activity may play in soil carbon dynamics. Our project aims to fill this knowledge gap,” Classen said. [Read more…]

Five mercury cleanup projects wrapped up in February

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Mercury-contaminated Tank Cleanup

Workers load a mercury-contaminated tank onto inspection saddles. (Image courtesy of U.S. Department of Energy/UCOR)

Five mercury projects being performed under the American Recovery and Reinvestment Act were completed in February, with URS-CH2M Oak Ridge LLC, or UCOR, issuing the final reports.

The projects ranged from planning new facilities and planning for cost-effective disposition of mercury-contaminated media, to removing old, abandoned tanks containing mercury. All are part of getting ready for an upcoming major focus on mercury cleanup at the Y-12 National Security Complex.

In the area of Y-12 known as the West End Mercury Area, or WEMA, multiple facilities produced a lithium isotope fundamental to the development of the hydrogen weapon. Mercury was used in that process. In those facilities, various amounts of mercury are present in the process pipes and equipment, drains and sumps, soil surrounding the facilities, storm sewers, and stream sediments.

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ORNL researchers improve soil carbon cycling models

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Carbon Cycling Model

Oak Ridge National Laboratory’s new carbon cycling model could help scientists understand the role of soil in climate change by tracking the microbial processes that break down carbon-rich materials. (Graphic submitted by ORNL)

A new model developed at Oak Ridge National Laboratory helps scientists understand the role that soil will play in future climate change, a press release said.

Predicting climate change depends heavily on the cycling of carbon dioxide, which is found in four main reservoirs: the atmosphere, biosphere, oceans, and soil, the release said.

ORNL’s model was designed to replace traditional soil carbon cycling models. The press release said it better accounts for the carbon dioxide-releasing activity of microbes in the ground.

“Soil is a big reservoir of carbon,” said co-author Melanie Mayes of ORNL’s Environmental Sciences Division. “And most of the soil carbon cycling models in use today are so vastly simplified that they ignore the fact that decomposition is actually performed by microbes.”

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