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Remediation of Surface Impoundments Operable Unit
Project Description
ROS remediated the Surface Impoundments Operable Unit at the Oak Ridge National Laboratory (ORNL) in Oak Ridge, Tennessee. The project involved sediment removal, design, and construction of a sludge/sediment dewatering facility at the site. Wastewater from groundwater entering the impoundments and dewatering activities was pretreated through a system designed and constructed by ROS prior to discharge to the Process Wastewater Treatment Facility (PWTF). Treatment was required to meet the waste acceptance criteria of the PWTF. The isotopes of concern at the SIOU were C137, Sr90, Pu239, Pu240, and Am241. These isotopes were in concentrations up to a total of 250 curies.
The work was to be accomplished by ROS in five phases. During the first phase, ROS conducted initial site preparation including equipment, treatment system layout and staging location plans. During the second phase, the facility was designed. The third phase included treatment facility construction and operational testing including mobilization, sediment treatment facility construction/setup and operational testing, and subimpoundment soil treatment facility construction/setup and operational testing. The fourth phase included the retrieval, treatment, transportation and disposal of the sediment. The berms used for erosion control were inspected daily. During the last phase the site was restored, cleaned up and permanent erosion and sediment controls were constructed.
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