Tracer gas diffusion sampling test plan

Technical Report · Fri Oct 01 04:00:00 EDT 1993

DOI:https://doi.org/10.2172/10190117· OSTI ID:10190117

Rohay, V J

Efforts are under way to employ active and passive vapor extraction to remove carbon tetrachloride from the soil in the 200 West Area an the Hanford Site as part of the 200 West Area Carbon Tetrachloride Expedited Response Action. In the active approach, a vacuum is applied to a well, which causes soil gas surrounding the well to be drawn up to the surface. The contaminated air is cleaned by passage through a granular activated carbon bed. There are questions concerning the radius of influence associated with application of the vacuum system and related uncertainties about the soil-gas diffusion rates with and without the vacuum system present. To address these questions, a series of tracer gas diffusion sampling tests is proposed in which an inert, nontoxic tracer gas, sulfur hexafluoride (SF{sub 6}), will be injected into a well, and the rates of SF{sub 6} diffusion through the surrounding soil horizon will be measured by sampling in nearby wells. Tracer gas tests will be conducted at sites very near the active vacuum extraction system and also at sites beyond the radius of influence of the active vacuum system. In the passive vapor extraction approach, barometric pressure fluctuations cause soil gas to be drawn to the surface through the well. At the passive sites, the effects of barometric ``pumping`` due to changes in atmospheric pressure will be investigated. Application of tracer gas testing to both the active and passive vapor extraction methods is described in the wellfield enhancement work plan (Rohay and Cameron 1993).

• Research Organization: Westinghouse Hanford Co., Richland, WA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC06-87RL10930
• OSTI ID: 10190117
• Report Number(s): WHC-SD-EN-TP--035; ON: DE94001697; BR: 35AF11201/35AF11202
• Country of Publication: United States
• Language: English

Related Subjects

054000
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
54 ENVIRONMENTAL SCIENCES
540220
540250
CARBON TETRACHLORIDE
CHEMICALS MONITORING AND TRANSPORT
DIFFUSION
GASES
HANFORD RESERVATION
HEALTH AND SAFETY
REMEDIAL ACTION
SEPARATION PROCESSES
SITE RESOURCE AND USE STUDIES
SOILS
SULFUR FLUORIDES
VAPORS