USGS Scientific Investigations Report 2007-5155
Prepared in cooperation with the Naval Facilities Engineering Command Southeast
By Don A. Vroblesky and Clifton C. Casey
U.S. Geological Survey Scientific Investigations Report 2007-5155, 7 pages (Published October 2007)
This report is available online in PDF format: SIR 2007-5155 () (637 KB)
The U.S. Geological Survey, in cooperation with the Naval Facilities Engineering Command Southeast, used newly developed sampling methods to investigate ground-water contamination by chlorobenzenes beneath a drainage ditch on the southwestern side of Installation Restoration Site 4, Naval Air Station Corpus Christi, Corpus Christi, Texas, during 2005–06. The drainage ditch, which is a potential receptor for ground-water contaminants from Installation Restoration Site 4, intermittently discharges water to Corpus Christi Bay. This report uses data from a new type of pore-water sampler developed for this investigation and other methods to examine the subsurface contamination beneath the drainage ditch. Analysis of ground water from the samplers indicated that chlorobenzenes (maximum detected concentration of 160 micrograms per liter) are present in the ground water beneath the ditch. The concentrations of dissolved oxygen in the samples (less than 0.05–0.4 milligram per liter) showed that the ground water beneath and near the ditch is anaerobic, indicating that substantial chlorobenzene biodegradation in the aquifer beneath the ditch is unlikely. Probable alternative mechanisms of chlorobenzene removal in the ground water beneath the drainage ditch include sorption onto the organic-rich sediment and contaminant depletion by cattails through uptake, sorption, and localized soil aeration.
This report is available online in PDF format: SIR 2007-5155 () (637 KB)To view the PDF document, you need the Adobe Reader installed on your computer. (A free copy of the Adobe Reader may be downloaded from Adobe Systems Incorporated.)
Suggested citation: Vroblesky, D.A., and Casey, C.C., 2007, Investigation of ground-water contamination at a drainage ditch, Installation Restoration Site 4, Naval Air Station Corpus Christi, Corpus Christi, Texas, 2005–06: U.S. Geological Survey Scientific Investigations Report 2007–5155, 7 p. (online only at https://pubs.water.usgs.gov/sir2007-5155)
For more information, please contact Don A. Vroblesky.