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To install the aquifer sampling tubes, Pacific Northwest National Laboratory field researchers using a hand-held air hammer drive a steel casing 30 feet into the ground and lower one or three sampling tubes into the casing to depths of approximately 30, 15, and 6 feet. The bottom six inches of tubing has an opening covered with stainless steel mesh to draw in water samples. After the tubes are anchored in place the casing is removed, leaving about 3 feet of tubing accessible above ground for sampling.

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Document Title: Aquifer Sampling Tubes
Category: Environmental Remediation, Wildlife and Environmental Studies
Media Type: Graphics
Date of Image/Photo: June 14, 2005
Background: Aquifer sampling tubes were developed by the Hanford Site environmental contractor in 1995 for sampling water discharging to the Columbia River from underground aquifers. Additional tubes were installed in 1997 and 2003. Coverage now extends along much of the Hanford Site shoreline, and includes 133 sites with 339 individual tubes, including many of the original tubes. Sampling sites are located every half-mile along the shoreline between 100-B Area and the old Hanford Townsite, and along the 300 Area. The aquifer tube network is currently a task within PNNL's larger Groundwater Performance Assessment Project. After installation the exposed end of the tube, approx 3 feet, is protected with PVC pipe and covered with rocks to hide it from view. The tubes are an inexpensive alternative to traditional monitoring wells and cause much less impact in the environmentally and culturally sensitive area of the Columbia River shoreline.
URL of this page: http://picturethis.pnl.gov/picturet.nsf/by+id/AMER-6.._X3

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