SWSA 6 is a 68-acre LLW disposal area at ORNL that opened in 1969 and began full-scale operations in 1973. A wide variety of wastes have been disposed of at SWSA 6 including low-level, chemical and biological wastes. Disposal units have consisted of unlined trenches, auger holes, silos, concrete casks, and tumulus-type facilities. Fig. 1 is an aerial view of SWSA 6 that shows IWMF = Interim Waste Management Facility; odd sample numbers are blanks. Gross beta analysis does not include tritium. 'All data in BqlmL, mean f 1 SE (counting error only). Gross beta analysis does not include tritium.
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Soil column studies were used to evaluate petroleum hydrocarbon (PHC) remediation in soils from Kwajalein Atoll. Treatments included controls, and combinations of water, air, nutrients, and bioaugmentation with indigenous microbes (W, A, N, and M, respectively). Microbial colony forming units (CFU) decreased in the control columns and in treatments without air. Treatments including W+A+N and W+A+N+ exhibited increased CFU. One third of the PHC was removed by water and another third was removed by W+A+N and W+A+N+M treatments. Bioaugmentation with indigenous PHC degraders did not enhance bioremediation. Potential for bioremediation was demonstrated by air, water, and nutrient amendments.
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