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ENVIRONMENTAL CONSTRUCTION AND REMEDIATION Mitchell Branch Plume Project The scope of work was to intercept, collect and treat uncontrolled volatile organic compound (VOC) plumes in unconsolidated-zone groundwater from the Mitchell Branch and K-1070-C/D areas at the East Tennessee Technology Park in Oak Ridge, Tennessee. The Technology Park, located on the U.S. Department of Energy Reservation, is an inactive gaseous diffusion uranium enrichment facility.
The project included the construction of two groundwater collection trenches. The first trench was constructed in the K-1070 area. It was 800 linear feet with a maximum depth of 22 feet. A gravel backfill material was installed. The second trench was constructed parallel to Mitchell Branch Creek in the K-25 area. This trench was 1,400 linear feet with a maximum depth of 25 feet. Both trenches were excavated under a Bio-Polymer slurry. A HDPE curtain wall was installed on the downgradient face of the trench along with a gravel backfill. Due to the inconsistency of the underlying bedrock depth, the bottom of each HDPE panel was modified to conform to any variances in the bedrock layer.
The project was performed in areas on the site that had a potential chemical and radiological exposure. The crew was required to complete RAD Worker II training prior to the job startup. The supervisor and crew exhibited a proactive positive stance on safety, with an open exchange with respect to safety issues.
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