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The AAPG/Datapages Combined Publications Database

Environmental Geosciences (DEG)


AAPG Division of Environmental Geosciences Journal
Vol. 4 (1997), No. 4., Pages 159-170

Regional Shallow Previous HitSoilNext Hit-Gas Hydrocarbon Results in the Southeastern Atlantic Coastal Plain

D. E. Wyatt, D. M. Richers, R. J. Cumbest


A regional Previous HitsoilNext Hit-gas study centered on the U.S. Department of Energy Savannah River Site (SRS), located in the southeast Atlantic Coastal Plain, was conducted between 1993 and 1996. The study involved 2870 samples in three separate sampling events and covered an area of ~3200 km2. The primary purpose of this study was to determine background values for various chemical constituents to aid in waste-unit screening at SRS. In addition, the study was conducted to support the evaluation of regional geology and possibly provide input from methane data into climatological models. Both free Previous HitsoilNext Hit-air and Previous HitsoilNext Hit-plug samples were obtained from the near-surface environment.

Data distribution of Previous HitsoilNext Hit-air and Previous HitsoilNext Hit-plug values were generally analogous but differed in magnitude. Previous HitSoilNext Hit-plug C2–C4 and toluene showed sparse but clustering patterns most likely related to geological sources of hydrocarbon associated with the Riddleville and Dunbarton Triassic basins. Oxygen data suggest that the near-surface soils (to a depth of 1 m) were in full contact with the near-surface atmosphere. For all analytes, except methane and ethane/ethylene, modal values approached zero or were less than instrument detection limits.

The presence of anomalous Previous HitsoilNext Hit-gas constituents occurring naturally within the region, notably toluene and the light saturates ethane through butane, suggests that regional values must be considered when evaluating localized geochemical characterization. Additionally, this study confirms that there is a variation in Previous HitsoilNext Hit-gas results as affected by different Previous HitsoilNext Hit-air and Previous HitsoilTop-plug techniques. Regional values for C1 through C10 and halogenated hydrocarbons are presented.

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