Borehole completion data package for SWL facility wells 699-22-35 and 699-23-34B Page: 4 of 251
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Two groundwater monitoring wells were drilled at the Hanford Solid Waste Landfill in 1993 and
1994 in support of the WAC 173-304 groundwater monitoring program at that site. The wells, 699-22-35
and 699-23-34B, were constructed in accordance with the requirements of WAC 173-160. However, a waver
was received from the Washington State Department of Ecology to complete the wells with 10.7-m (35-ft)
screens to allow for the expected drop in the water table in the vicinity of the landfill. The wells, drilled with
an ODEX air rotary drilling rig, were completed at depths of 54.8 m (180 ft) and 49.8 m (163.5 ft),
respectively, and were completed with 4-in. stainless steel casing and continuous-wrap wire screen with a
sand pack of 20-40 mesh silica sand. The wells were developed and equipped with Hydrostar sampling
pumps. Sampling with the SEAMIST membrane system during drilling indicated significant quantities of
carbon tetrachloride vapor to depths of at least 35.6 m (120 ft) within the vadose zone.
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Hodges, F.N. Borehole completion data package for SWL facility wells 699-22-35 and 699-23-34B, report, September 1, 1997; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc698321/m1/4/: accessed January 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.