Georgia Water Science CenterGeorgia Water Science Center
This report is available online in pdf format (1 MB): USGS OFR 00-277 ()
Lisa M. Stewart
U.S. Geological Survey Open-File Report 00-277, 28 pages (Published 2000)
Ground-water samples were collected during the Summer of 1997 from four deep and three shallow monitoring wells to delineate the vertical and areal extent of ground water containing a trichloroethylene and metals contamination plume. Contaminated ground water occurs on the property of Southern Polytechnic State University, adjacent to U.S. Air Force Plant 6, Marietta, Georgia.
Ground-water samples were analyzed for selected compounds from Appendix IX to U.S. Code of Federal Regulations, Title 40, Part 264 (40 CFR 264) that include volatile and semi-volatile organic compounds, metals, cyanide, and sulfide. One deep monitoring well was resampled for chemical analysis of gasoline-range and diesel-range hydrocarbons and an expanded Appendix IX list of compounds (including dioxins and furans; and pesticides and herbicides).
Because each deep monitoring well intercepts multiple water-bearing fracture zones in the crystalline rocks underlying the site, mixing of water from different fracture zones is probable. Such borehole mixing results in ground-water samples that poorly represent a specific water-bearing zone. A sampling device specifically designed to isolate short vertical open sections of a monitoring well was used to ensure that the ground-water samples collected were representative of specific water-bearing zones.
Analytical results from the ground-water samples show that trichloroethylene and metals are present in ground water in the saprolite and fractured rock underlying the site. Diesel-range organic compounds also were detected in ground water from one deep monitoring well.
Purpose and scope
Methods of study
This report is available online in pdf format (39 MB): USGS OFR 00-277 ()
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