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This project addressed the recovery and characterization of the microbial community present in the densely welded volcanic tuff of Yucca Mountain.Yucca Mountain is located in the Topapah Spring Range on the Nevada Test Site and is the site of the proposed high-level nuclear waste repository.Emphasis of study was placed on the populations of microorganisms commonly implicated in microbially-influenced corrosion (MIC).Historically, these bacterial groups include: 1) sulfate-reducing bacteria,-2) iron-oxidizing bacteria; 3) acid-producing bacteria and 4) exopolysaccharide-producing (EPS) bacteria.Three deep subsurface locations on the Nevada Test Site (Rainier Mesa, Yucca Mountain and Yucca Flat) were characterized microbiologically and physically to assess the potential for MIC.Various parameters were compared to determine whether Rainier Mesa or Yucca Flat might serve as a structural analog to Yucca Mountain for microbiological investigations.While some similarities existed between the sites, each had unique microbiological and physical iii
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B. Pitonzo (2019) studied this question.